Qqkk ransomware: what it is and how to get your files back
Qqkk ransomware is a version of the STOP/Djvu family that encrypts your files, adds .qqkk to their names and asks $980 in a note called _readme.txt. Whether you can decrypt them depends on the key type: files locked with an offline key the free Emsisoft decryptor knows can be opened, the rest need backups.
Facts checked October 6, 2026. Removal steps tested on Windows 11 (26H2) and checked against Microsoft's and the browser makers' current documentation.
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Qqkk ransomware: summary
| Type | File-encrypting ransomware of the STOP/Djvu family |
|---|---|
| Risk | High: files are lost unless the key was an offline key Emsisoft has; the download that brought it may also carry a password stealer |
| Symptoms | Files renamed .qqkk, _readme.txt in folders, files that no longer open, blank file icons |
| How to get rid of it | Scan in Safe Mode with Microsoft Defender, remove the crack or bundle, then try the Emsisoft decryptor and backups; see the plan |
| Our check | Source check on 6 October 2026 (Emsisoft, BleepingComputer, Microsoft, CISA) and our August 2022 screenshots; we did not run the malware |
| First seen | 23 August 2022 (our first report and the VirusTotal sample) |
| Removal | Scan the PC with security software to find and remove the malware and anything installed with it. Fortect scans Windows for malware and repairs the system files and settings it damaged. Remove it nowTo use the full-featured product, you have to purchase a license for Fortect. The scan is free. |
Show 14 more facts
| Name | Qqkk ransomware (STOP/Djvu) |
|---|---|
| Encrypted file extension | .qqkk |
| Ransom note | _readme.txt, quoted below |
| Decryptor | Emsisoft STOP Djvu decryptor, only for offline-key files |
| Price in the note | $980, or $490 within 72 hours |
| Contact | Two e-mail addresses in _readme.txt; no web page and no wallet address printed here |
| Evidence | 4 write-ups by security sites; no sample analysed yet |
| Encrypted files | .qqkk |
| Free decryptor | The free Emsisoft STOP Djvu decryptor works only for files locked with an offline key it holds, and we could not confirm a key for .qqkk (checked 6 October 2026) |
| Microsoft Defender name | Ransom:Win32/StopCrypt (the Microsoft family name for STOP/Djvu; the exact label for the .qqkk sample is not confirmed) |
| Distribution | Typically cracked programs, keygens and game cheats, fake installers, e-mail attachments, and Remote Desktop with weak passwords in small offices |
| Damage | Files on the PC and connected drives encrypted, restore points often deleted, sometimes a password stealer installed as well |
| Detection names | Microsoft: Ransom:Win32/StopCrypt (the Microsoft family name for STOP/Djvu; the exact label for the .qqkk sample is not confirmed) |
| Facts checked | 6 October 2026 |
Facts checked on 6 October 2026 against Emsisoft's STOP Djvu decryptor page, BleepingComputer's topic about a .qqkk victim and its STOP support topic, Microsoft Support and CISA, plus our own August 2022 screenshots. We did not run the malware.
What Qqkk ransomware is
Qqkk is one of many four-letter extensions of the STOP/Djvu ransomware family. It encrypts documents, photos and other personal files on Windows, adds .qqkk to each name and leaves a ransom note called _readme.txt.
Our August 2022 guide described a file locker recognised by that note and by a random four-letter extension; BleepingComputer says the developers have kept to four random letters since .gero in August 2019. Locked files lose their icons and show a blank white sheet, as in our screenshot.
- Family
- STOP/Djvu ransomware
- Extension
.qqkk, for example3.exe.qqkkor6.docx.qqkk- Note
_readme.txt; the family also uses_openme.txtand_open_.txt- Price in the note
- $980, or $490 if the victim writes within 72 hours; no currency named
- Contact in the note
- Two e-mail addresses,
support@bestyourmail.chanddatarestorehelp@airmail.cc; no web page - Our first report
- 23 August 2022
- Can the files return?
- Only when the key was an offline one that Emsisoft has
The addresses are printed only so that you can match the note; do not write to them. The video link in the note is different in every copy and we did not open it. In BleepingComputer's list .qqkk sits among .qqmt, .qqri, .qqlo, .qqlc, .qqjj and .qqpp, and all of them work the same way.
How the Qqkk story went
10 February 2018
The STOP support topic opens
BleepingComputer's topic is still the family's main support page, with more than 800 pages. Our 2022 guide was right that the family dates from 2018.
October 2019
Emsisoft releases a decryptor
Version 1.0.0.5 of 18 October 2019 replaced the older STOPDecrypter for new variants and is still the version on Emsisoft's page.
The Emsisoft decryptor page as our 2022 guide showed it: version 1.0.0.5 and 1,577,235 downloads. On 6 October 2026 the page still shows that version and 4,766,551 downloads. 23 August 2022
Our first Qqkk report
We described
.qqkkand its_readme.txt. The same day a sample called18FF.exewas flagged by 46 of 71 engines on VirusTotal.3 May 2024
A victim asks for help
A victim of August 2022 wrote on BleepingComputer that his offline-ID files still would not open and Emsisoft's decryptor did nothing. A moderator replied that offline keys reach Emsisoft only after a victim pays and shares the key, with no timetable.
December 2024
The .held variant, then silence
A BleepingComputer moderator wrote that since
.heldthere was no news or explanation for the disappearance of the gang, and no new variants.6 October 2026
Our recheck
We rebuilt the guide from the current Emsisoft and BleepingComputer pages. Emsisoft still shows version 1.0.0.5, and we found nothing new about
.qqkk.
What we checked and what we did not
We did not run this malware and no website is involved, so there is no site test. This is a check of sources and of our own 2022 screenshots, and a quiet check proves nothing about what the file does on your PC.
Qqkk ransomware · source check · 6 October 2026
- Family and extensionOur screenshot shows
.qqkkfiles and_readme.txtwith the Djvu wording; BleepingComputer has a topic titled "Ransomware .qqkk (STOP Djvu)". - Detection on day oneOur VirusTotal screenshot of 23 August 2022: 46 of 71 engines flag an 824 KB file called 18FF.exe, among them Gen:Variant.Mikey.140543 (BitDefender, Emsisoft), Win32:PWSX-gen (AVG) and Trojan.PWS.Stealer.33898 (Dr.Web).
- What those names sayPWS and Redline names fit the warning that cracks carry password stealers. We cannot tell whether this file was the ransomware or something that came with it.
- An offline key for .qqkk?Not confirmed. A victim reported an offline ID in 2024 and still no result.
- Registry, shadow copiesNo source, so none are listed.
Files probably lost unless the key is offline If your ID does not end in t1, an online key was most likely used and only the attackers hold it. Whatever installed the ransomware may have installed other threats too.
- File extension:
.qqkk - Note file:
_readme.txt
How Qqkk ransomware behaves
How the family locks files, step by step
Whether files can be saved is decided before the encryption starts, by the kind of key the malware gets.
- 1
A download starts it
BleepingComputer names adware bundles, pirated software, Office and Windows activators, cracks and shady sites. The malware runs at start-up and as a scheduled task every 5 minutes.
- 2
It asks its server for a key
If the command server answers, it hands out a random online key for this one victim. The malware keeps retrying every 5 minutes.
- 3
No answer: a built-in key
Without a connection it falls back on a hard-coded offline key with a built-in offline ID, shared by every victim of the same extension.
- 4
Files are locked
Emsisoft names Salsa20 for the files. BleepingComputer says only the first 150 KB of each file is encrypted, 334 bytes are added, and a marker in curly brackets ends the file.
- 5
The note appears
_readme.txtgives the price, two addresses and your personal ID.
Online key or offline key: what your ID tells you
Read the end of the personal ID in _readme.txt. An ID ending in t1 is generally an offline ID, and only for those can the free Emsisoft decryptor work.
| Offline key | Online key | |
|---|---|---|
| How it came about | No server answered | The server answered |
| Who else has it | Every victim of this extension | Nobody, one key per victim |
| ID in the note | Generally ends in t1 | Anything else |
| Emsisoft decryptor | Works only if Emsisoft holds the key | Cannot work |
The ID in our 2022 screenshot ends in w1, so by that rule of thumb it points to an online key. That is one note from one machine; read your own.
Our 2022 guide said the files are locked with RSA. Half true: BleepingComputer says RSA protects the key, and Emsisoft names Salsa20 for the files. The guide's "undecryptable" holds for online keys only.
What it does to the PC
The encryption is documented. Most of the other damage our 2022 guide listed is general ransomware behaviour that we could not tie to .qqkk, so it is marked as such.
Qqkk ransomware · behaviour claims · 6 October 2026
- Locks personal files, appends `.qqkk`Seen in our August 2022 screenshot and in Emsisoft's description of the family.
- Keeps runningBleepingComputer: a scheduled task runs it every 5 minutes, which can lock the same files again with a second variant.
- Only the start of each fileThe first 150 KB, says BleepingComputer, so a file can still preview and yet not open.
- All connected drivesFrom our 2022 guide, no source for
.qqkk; unplug backup drives before you scan. - System files, registry, boot files, DLLsOur 2022 guide both said it damages system files and that it does not seem to; no source says either, so we list no keys.
- Backups deleted, recovery tools disabledCommon in ransomware, not confirmed for
.qqkk. Check Previous Versions before you assume the copies are gone. - The PC freezesOur 2022 guide named freezing and unreadable files as the only signs. Freezing is not confirmed; the extension, the note and files that no longer open are.
Behaviour beyond the encryption is not confirmed Treat the PC as untrusted until it has been scanned in Safe Mode: a password stealer that came with the download may still be running.
How it reaches PCs
The documented route is a download of pirated or bundled software; our 2022 guide named no route.
- High
Cracks, keygens and activators
BleepingComputer lists pirated software, Office and Windows activators, cracks and shady sites.
- High
Adware bundles
A free program that installs more than it said.
- Low
Spam attachments
Neither Emsisoft nor BleepingComputer names e-mail for this family: possible, unproven.
What else may be on the PC
The ransomware is often not alone: the download that carried it may have brought a password stealer.
- High
Stolen passwords and card data
Our 2022 guide said some Djvu variants add modules that steal passwords and keystrokes. The PWS and Redline names in our VirusTotal screenshot fit, but we did not test the
.qqkkfile. - Medium
The ransomware stays
Our 2022 guide said Djvu variants might not remain after encryption. BleepingComputer says a scheduled task runs it every 5 minutes.
- Medium
Accounts come next
From a different clean device, change passwords starting with e-mail and banking, and turn on two-step sign-in.
What to do in the first hour
- 1
Stop opening the download
Close the installer, crack or keygen folder and do not launch those files again.
- 2
Update, then cut the connection
Our 2022 guide said to update the security software and disconnect. Update Microsoft Defender, then unplug the cable or turn off Wi-Fi so shared drives are not locked.
- 3
Photograph the note, copy the locked files
Keep one
_readme.txt. Copy the.qqkkfiles to a USB drive before the scan, then unplug it. - 4
Stay away from the attackers
Their free test file starts a conversation that ends with a price and a request to buy cryptocurrency.
- 5
Report it
In the US, CISA's guide names cisa.gov/report, your local FBI field office and the FBI's IC3. Elsewhere, the national police or cybercrime service.
The Qqkk ransomware note
ATTENTION!
Don't worry, you can return all your files!
All your files like pictures, databases, documents and other important are encrypted with strongest encryption and unique key.
The only method of recovering files is to purchase decrypt tool and unique key for you.
This software will decrypt all your encrypted files.
What guarantees you have?
You can send one of your encrypted file from your PC and we decrypt it for free.
But we can decrypt only 1 file for free. File must not contain valuable information.
You can get and look video overview decrypt tool:
hxxps://we.tl/t-USug3rryKI
Price of private key and decrypt software is $980.
Discount 50% available if you contact us first 72 hours, that's price for you is $490.
Please note that you'll never restore your data without payment.
Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours.
To get this software you need write on our e-mail:
support@bestyourmail.ch
Reserve e-mail address to contact us:
datarestorehelp@airmail.cc
Your personal ID:
Can Qqkk ransomware files be decrypted?
Can .qqkk files be decrypted?
Sometimes: only with Emsisoft's STOP Djvu decryptor and only if your files were locked with an offline key it holds. Files locked with an online key cannot be opened by anyone but the attackers.
Our 2022 guide also told readers to upload one encrypted and one healthy file. That option is for old Djvu only; Emsisoft says it does not apply to versions after August 2019, which includes .qqkk.
| The tool says | So | You |
|---|---|---|
Files decrypted, ID ends in t1 | Emsisoft holds the offline key | Check them, copy them to a clean drive |
| "No key for New Variant offline ID" | Offline ID, key not known yet | Keep copies, retry every week or two |
| "this ID appears to be an online ID" | Online key | Only backups can help |
Waiting has a catch: Emsisoft gets an offline key only after a victim pays and passes it on, and a BleepingComputer moderator wrote in 2024 that Emsisoft appears to have stopped developing the tool. It needs Microsoft .NET Framework 4.5.2 or newer and an internet connection.
- 1
Remove the malware first
Complete the scan in the removal plan, or the running malware can lock restored files again.
- 2
Use copies
Put copies of the
.qqkkfiles and one_readme.txton a USB drive and look at the last characters of your ID. Do not send the ID to anyone. - 3
Download from Emsisoft only
Open the emsisoft.com page in our sources and press Download. In our old screenshots
decrypt_STOPDjvu.exeappears in the download bar at the bottom of the browser. - 4
Answer the prompts
Yes for User Account Control and the License Terms, OK for the Disclaimer.
- 5
Choose folders and press Decrypt
Your drives are listed; Add folder picks others. The Results tab then shows one of the messages above for each file.
Do
- Keep every encrypted file, even if the tool fails today
- Open a few decrypted files before deleting their encrypted twins
Don't
- Do not pay anyone for a "decryptor", the note's authors included
- Do not expect a full scan to unlock files
Should you pay the ransom?
No. The note asks $980, or $490 if you write within 72 hours. Our 2022 guide spoke of bitcoin; the note we have names no currency, and none of our sources says paying reliably works.
- High
Money gone, files still locked
Nothing binds the authors to their promise and a payment cannot be reversed. Our 2022 guide said it plainly: the creators are not keen to recover files.
- Medium
A timer built to hurry you
The "50% off" in our 2022 guide is the 72-hour discount: half price only for those who write within three days.
Online keys exist only on the attackers' side, and Emsisoft receives offline keys only after some victim has paid and passed one on. So other people's payments, not yours, feed the decryptor.
How to remove Qqkk ransomware
Tools you'll need
All of these are free except where noted. Download them on a clean device if the infected PC is offline.
- A USB stick: to keep the ransom note, two or three encrypted files and screenshots off the infected PC.
- Microsoft Defender Offline: built into Windows 11 and Windows 10; scans before Windows starts, so running malware cannot hide.
- Microsoft Safety Scanner: a second, portable scanner with current signatures; each download works for 10 days.
- ID Ransomware: identifies the family from the note and one encrypted file and says whether a decryptor exists.
- No More Ransom: the free decryptors from police and security companies; check it again every few months.
- Fortect (optional): scans Windows for malware and repairs the system files and settings it damaged. The free scan is in the box above.
How to remove Qqkk ransomware and get your files back
Work in this order.
Disconnecting comes first, removal comes before any restore, and nothing here asks you to contact the attackers.
Step 1: Disconnect the PC and unplug backup drives
Unplug the network cable or turn off Wi-Fi, and disconnect USB drives, external disks and network shares, so Qqkk ransomware cannot reach more files. Pause OneDrive, Google Drive or Dropbox sync, because synced folders upload the encrypted copies over the good ones.
Leave the PC on but offline while you read the next steps, since a restart can let the ransomware run again. This applies to Windows 11 and Windows 10 alike.
Windows 11: turn off Wi-Fi to take the PC offline. Full procedure with screenshots: Ransomware: first steps, finding a decryptor and recovering files
Step 2: Save the ransom note and confirm the family
Your files now end in
.qqkkand the instructions are in_readme.txt. Save both to a USB stick, a copy of the note and two small encrypted files, before anything else.On another device, check them with ID Ransomware or Crypto Sheriff: the family name decides which decryptor, if any, can help. Keep the note's ID and contact line for your report.
Windows 11: the ransom note and encrypted files to copy for identification. Full procedure with screenshots: Ransomware: first steps, finding a decryptor and recovering files
Step 3: Check for a free decryptor
Our last check found that for Qqkk ransomware, the free Emsisoft STOP Djvu decryptor works only for files locked with an offline key it holds, and we could not confirm a key for .qqkk (checked 6 October 2026).
Look again yourself in the No More Ransom list and the free decryptor pages of Emsisoft, Avast and Kaspersky, which add new families every year.
A decryptor needs the ransomware gone first, or it encrypts the files again. Keep at least one copy of the encrypted files on an external drive, even if no tool works yet.
Full procedure with screenshots: Ransomware: first steps, finding a decryptor and recovering files
Step 4: Remove the ransomware before you restore or decrypt
Removing Qqkk ransomware does not bring the files back, but it has to come first. Start with Defender's Full scan, then the offline scan from the same Scan options page, which checks the disk before Windows loads.
If the scan cannot start, use Safe Mode with Networking. Delete the ransom notes only after you have saved a copy, because removal tools sometimes leave them behind on Windows 11 and Windows 10.
Windows 11: Windows Security > Virus & threat protection > Scan options. Full procedure with screenshots: Run a Microsoft Defender Offline scan
Step 5: Look for shadow copies of the files
Windows keeps shadow copies for restore points and backups, and some ransomware fails to delete them.
vssadmin list shadowsin an administrator Command Prompt tells you at once whether any exist.If they do, right-click the folder that held your files, open Properties > Previous Versions, select a version from before the attack, and click Open to check it before you Restore or copy the files out. Windows 11 and Windows 10 both have the tab.
Windows 11: vssadmin list shadows shows whether shadow copies exist. Full procedure with screenshots: Ransomware: first steps, finding a decryptor and recovering files
Step 6: Restore the files from a backup or recover deleted originals
A backup made before the attack is the surest way back. Connect it only once the PC is clean, then restore from File History, Windows Backup, OneDrive's Restore your OneDrive or your own external copies.
Without a backup, try file recovery: the originals that Qqkk ransomware deleted may still be on the disk until something overwrites them. Install nothing new on the drive you want to recover from on the Windows 11 or Windows 10 PC.
Full procedure with screenshots: Recover deleted files (Recycle Bin, backups, OneDrive) On uGetFix
Report it and recover your files
Report it
Report the attack even if you do not expect the files back: insurers and banks ask for the report number, and police use the contacts in the note to link cases.
- United States
- FBI IC3 · FTC ReportFraud
- United Kingdom
- Report Fraud (formerly Action Fraud) · NCSC
- Australia
- ReportCyber (ASD)
- EU countries
- Europol: national reporting sites
Give the victim ID, the note and the date the files were encrypted. A business that holds personal data may also have to notify its data protection authority, in the EU within 72 hours.
Other ways to get files back
A scan clears the ransomware but cannot turn .qqkk files into documents again.
When the PC is clean, try these in order and save nothing new to the disk meanwhile.
- 1
Your own backups
An external drive, a NAS or cloud storage such as OneDrive. Connect it only once the PC is clean.
- 2
File History and Previous Versions
Microsoft says File History keeps earlier versions of files, if it was on. Right-click a folder and choose Restore previous versions (Windows 11: Show more options first). Ransomware often removes these copies; restore one file to find out. We have not tried it on
.qqkk. - 3
Windows File Recovery
Microsoft's
winfrlooks for deleted, not overwritten files, for examplewinfr C: E: /regular /n \Users\<username>\Documents\with E: on another drive. It cannot decrypt, and free space may already be overwritten, especially on an SSD. - 4
Repair of partly locked media
Because only 150 KB is locked, BleepingComputer lists tools that repair, not decrypt, JPEG pictures and audio or video files. One is no longer free; we have not tested any.
- 5
Reinstall Windows last
Our 2022 guide said some infections leave Windows unstable enough to need a reinstall. After a clean scan most PCs run on; copy the files you want first.
Back up with the 3-2-1 rule
CISA says to keep backups offline, because many ransomware variants look for backups they can reach and delete or encrypt them.
| Number | Rule |
|---|---|
| 3 | Three copies of what matters |
| 2 | Two kinds of storage |
| 1 | One copy away from the PC, such as an unplugged drive |
Questions about Qqkk ransomware
How do I open .qqkk files?
You cannot open .qqkk files normally, because the first part of each file is encrypted. They open again only if the free Emsisoft STOP Djvu decryptor has the key for your files.
Check the personal ID at the bottom of _readme.txt: an ID ending in t1 is generally an offline ID, which many victims share and which Emsisoft may have or receive later.
An ID that does not end in t1 means an online key that only the attackers hold. Renaming the files to remove .qqkk does nothing, since the data inside stays locked.
Is there a free Qqkk decryptor?
There is a free STOP Djvu decryptor from Emsisoft, but it is made for the whole family and works only for files locked with an offline key it has. We could not confirm that a key exists for .qqkk, and a victim wrote on BleepingComputer in 2024 that it did nothing for his offline-ID files.
Download it only from the emsisoft.com page in our sources, because lookalike decryptor sites are a common trap. Its page still shows version 1.0.0.5 of October 2019. Do not buy a decryptor from anyone.
Should I pay the Qqkk ransom?
No, do not pay the ransom. The note asks $980, or $490 if you write within 72 hours, and offers to decrypt one file for free. Nobody can hold the attackers to their promise, and the discount timer is there to hurry you.
A payment cannot be taken back, and it does not tell you whether your files were locked with an online key. Keep the note, copy the files to a drive, run the scan in our plan and check the offline-key decryptor and your backups instead.
How did Qqkk ransomware get on my PC?
Most likely through a crack, keygen, activator or pirated installer for paid software, or through an adware bundle. BleepingComputer lists adware bundles, pirated software, activators for Office and Windows, cracks and shady sites for the newer STOP/Djvu versions. Neither Emsisoft nor BleepingComputer ties e-mail attachments to this family, so we treat that as possible but unproven.
Think back to what you installed just before the files stopped opening, and do not run it again. Our 2022 guide named no route, so this comes from BleepingComputer; the file you downloaded may be the only evidence, so keep it away from your PC and do not delete it before you have photographed its name.
Will my passwords be stolen?
They might be. Our 2022 guide warned that Djvu variants can come with modules that steal passwords and keystrokes, and the detection names on our VirusTotal screenshot, such as PWS and Redline, fit a stealer. We cannot say whether the sample was the ransomware itself or something that came with it.
Change your important passwords, starting with e-mail and banking, from a clean device, and turn on two-step sign-in so that a stolen password is not enough. Then scan the PC as described in the plan before you sign in to anything from it.
How is Qqkk different from Qqri, Qqlo and .djvu?
It is not different in how it works, only in the extension and the ID it uses. Qqkk, .qqri, .qqlo, .qqjj and the older .djvu all belong to STOP/Djvu, so the same kind of note and the same decryptor apply.
What differs is the key: old Djvu has an extra option of submitting file pairs to Emsisoft, while versions after August 2019 do not. The ID of your own note decides what is possible, not the name of the extension. Our 2022 guide called Qqri and Qqlo the recent ones; in BleepingComputer's list they sit next to Qqkk.
Do paid decryption or data recovery services work on .qqkk files?
Not on the locked content. A recovery program can bring back a file that was deleted and not overwritten, but it cannot decrypt a locked one, and ransomware often writes the locked data over the original.
A service that promises to decrypt online-key files is almost certainly paying the attackers or is a scam, so ask where the key comes from before you hand over money.
Our 2022 guide also feared that Windows would need a reinstall; we found no source for system damage, so run the Safe Mode scan in our plan first and copy your files before any reinstall.
Will Fortect remove Qqkk ransomware?
Fortect scans Windows for malware and unwanted programs and repairs the system files and settings they change, and its free scan shows what it finds on your PC before you decide anything.
For Qqkk ransomware, follow the plan above as well: the browser steps take back permissions and settings that no scanner treats as a threat, and uninstalling the program that brought it removes the source.
Run Microsoft Defender's full scan and, if anything was found, its offline scan as a second opinion. If the symptoms are gone after the plan and both scans are clean, there is nothing more to do.
Sources
- Emsisoft: STOP Djvu decryptor (read October 6, 2026)
- BleepingComputer: Ransomware .qqkk (STOP Djvu) (read October 6, 2026)
- BleepingComputer: STOP Ransomware (.STOP .Djvu, .Puma, .Promo) support topic (read October 6, 2026)
- Microsoft Support: Windows File Recovery (read October 6, 2026)
- Microsoft Support: Backup and restore with File History (read October 6, 2026)
- CISA: #StopRansomware Guide (read October 6, 2026)