TechLetterSearch ads on Mac: what it is and how to remove it
TechLetterSearch is an adware program that users may find on their Mac computers. In most cases, this borderline malware app is distributed via malicious websites that show fake Flash Player update prompts, or might be found bundled with freeware from third-party websites.
Facts checked October 7, 2026. Removal steps checked against Apple's current documentation and the security vendors' reports. We have not run the malware on a Mac. Sections marked as our earlier report are the original text: they describe the threat as it was then and have not been reviewed since. The 2026 status, the removal steps and the questions are current.
Automatic
Get a free scan and check if your Mac is infected.
Fortect for Mac scans for malware and unwanted programs, and its free scan shows what it finds before you decide anything.
Programs like TechLetterSearch usually arrive in groups; a free scan lists the companions that are easy to miss.
Do it yourself · free Remove TechLetterSearch ads yourself 4 steps, about 12 minutes, no software needed.
Start the steps
TechLetterSearch ads: summary
| Name | TechLetterSearch |
|---|---|
| Type | Mac virus, adware |
| Infiltration | In most cases, the PUP is delivered with the help of fake Flash updates or installed along other software from third-party websites |
| Symptoms | Increased amount of advertisements on all visited websites, redirects to unknown domains, TechLetterSearch system notification prompts, changed web browser settings, etc. |
| Associated risks | Leak of anonymous and personal information, installation of potentially unwanted programs and malware, loss of money due to encountered scams, etc. |
| Termination | User anti-malware software that could find all the associated files and entries automatically or check out our manual removal guide below |
| Removal | Scan the Mac with security software to find the malware and anything installed with it. Fortect for Mac scans for malware and unwanted programs. Remove it nowTo use the full-featured product, you have to purchase a license for Fortect. The scan is free. |
Show 7 more facts
| Detection names | No Microsoft detection name is known |
|---|---|
| Distribution | Not recorded in the old report |
| Damage | Not recorded in the old report |
| Evidence | 5 write-ups by security sites; details still limited |
| Program | TechLetterSearch |
| First seen | 24 January 2020 |
| Facts checked | 7 October 2026 |
Is TechLetterSearch ads dangerous?
From our report of Jan 2020 · not reviewed since
Fake updates and software bundles: main malware attack vectors on macOS
Fake Flash Player updates have been around for years now, and users are still falling for a very old trick.
Flash is generally outdated and inefficient software will be terminated by its developer Adobe, as it has too many security flaws that can be abused by cybercriminals and is also often used in scam schemes online.
Besides, all modern web browsers have its functionality embedded, so there is no need for an actual plugin to be installed in the first place. However, because the software was so prevalent for many years, users still think it is needed, and some don't even know if they have it installed on their system.
A simple social engineering trick does wonders for cybercriminals, however, as they merely say that they need to update Flash in order to allegedly view website's contents, or that the update is simply due.
However, what users are downloading and installing is not a real Flash, but an adware app that can cause a wide array of web browser disturbances, such as redirects, pop-up ads, and similar. In some cases, users also install scareware like Advanced Mac Cleaner, as well as malware (Shlayer Trojan) in the same way.
Therefore, it is best to uninstall Adobe Flash Player altogether, as it is generally useless software for a regular user. If you insist on having it installed, you should always visit the official Adobe site and get it from there. In other words, never believe random notifications, such as update prompts and virus infection warnings that come from within the browser.
Additionally, experts highly advise choosing official software download sources, such as App Store, Amazon, Google Web Store, and so on - these stores have millions of apps combined, so there is plenty to choose from. If, however, you decide to stick to third-parties, watch out of optional components during the installation - pick Advanced/Custom setting, and get rid of all the offers on the way.
From our report of Jan 2020 · not reviewed since
TechLetterSearch is a malicious application designed to show macOS users adverts regularly
TechLetterSearch is an adware program that users may find on their Mac computers.
In most cases, this borderline malware app is distributed via malicious websites that show fake Flash Player update prompts, or might be found bundled with freeware from third-party websites. As a result, users are rarely aware of the PUA's entry, and only start noticing its existence after they notice Mac prompts and suspicious TechLetterSearch ads.
Once installed, TechLetterSearch virus will start to exhibit unwanted behavior on Safari, Google Chrome, Mozilla Firefox, or another web browser: show pop-ups, flashing windows, in-text links, banners, and other types on ads indicated with TechLetterSearch markings, redirect to suspicious scam or spam sites, etc.
Additionally, TechLetterSearch virus will engage in various background behavior that is not immediately visible. For example, the adware will try to establish new network connections with predetermined sites - this is when Mac will warn users with the following notification:
Note that this prompt should never be ignored, and you should never allow TechLetterSearch to connect to its network, as it can result in various unforeseen consequences, including additional software installation, which might not be safe. However, users reported that the pop-up warning shows up several times a day, and they do not know to remove these TechLetterSearch prompts, as they disturb normal computer operation.
Another invisible activity that TechLetterSearch will engage in is data tracking.
Adware applications are designed to produce various types of ads to users, and they are usually delivered with the help of a virtual layer, redirects, sponsored links, etc. The PUP is capable of doing so by altering the web browser settings, and sometimes establishing its own profile for persistence - the latter can make a regular TechLetterSearch removal and almost impossible task.
The TechLetterSearch data collection practices are performed with the help of tracking technologies such as web beacons, cookies, pixels, JavaScript, and other invisible components. Typically, the collected information includes:
In some cases, however, the potentially unwanted app like TechLetterSearch might grant itself elevated permissions during the installation, which would allow it to read sensitive data on all websites, such as credit card details.
Therefore, while TechLetterSearch might seem like a nuisance that keeps showing ads on all sites and the cause of occasional system warnings, it can be much more than that. Keep in mind that it is spread with the help of fake update prompts or scam sites, it might be able to read sensitive information on all the sites that you visit, and also may promote bogus software via advertisements.
Therefore, do not hesitate to uninstall TechLetterSearch as soon as you detect its prescience on your macOS. You can either do it anti-malware tools like or refer to our manual removal guide below. Tip: if you want to get rid of useless files on your Mac and speed it up, we encourage using .
- the IP address;
- Internet Service Provider (ISP);
- technical details of the device and browser;
- browsing data;
- ads interacted with, and other anonymous info.
From our report of Jan 2020 · not reviewed since
More from our earlier report on TechLetterSearch
- Do you want the application "TechLetterSearch" to accept incoming network connections?
- Clicking Deny may limit the application's behavior.
- This setting can be changed in the Firewall pane of Security & Privacy preferences.
How to remove TechLetterSearch ads
How to remove TechLetterSearch from a Mac
Remove the app and what starts it, then check the browsers.
Step 1: Delete apps and downloads you did not intend to install
Open the Applications folder and your Downloads folder. Drag any app you did not install, and any disk image (
.dmg), installer (.pkg) or archive (.zip) that came from TechLetterSearch or a site you do not trust, to the Bin, then empty the Bin.Also check
~/Library/Application Supportfor a folder with the same name as the app you removed.Step 2: Remove unknown login items and background items
Open System Settings > General > Login Items & Extensions. Under Open at Login and Allow in the Background, switch off or remove anything you do not recognize, especially items whose developer is shown as an unknown name or that appeared on the day you ran the command.
Then open Finder, choose Go > Go to Folder and check
~/Library/LaunchAgents,/Library/LaunchAgentsand /Library/LaunchDaemons for property list (.plist) files you did not add. Drag suspicious ones to the Bin, then restart the Mac.Step 3: Check the browsers for extensions and changed settings
In Safari open Settings > Extensions and General (homepage). In Chrome open
chrome://extensions, in Firefoxabout:addons.Remove any extension you did not add, and reset the homepage and search engine if they changed. Browsers hold saved passwords and cookies, which is why the password step comes first.
Step 4: Quit what is running that you do not recognize
Open Activity Monitor (in Applications > Utilities, or search for it with Command + Space).
In the CPU or Network tab, look for a process you did not install or whose name is random, select it, click the stop button (the octagon with an X) and choose Quit or Force Quit.
Note the name first: you will look for the same name in the next steps. Malware that comes back after a restart is handled in the next two steps.
Instructions for each browser and system
The detailed steps for every browser and system this guide covers. Open the one you use.
Remove from Google Chrome
Remember to reset Google Chrome after you get rid of TechLetterSearch to ensure its ads do not return:
Delete malicious extensions from Google Chrome:
- Open Google Chrome, click on the Menu (three vertical dots at the top-right corner) and select More tools > Extensions.
- In the newly opened window, you will see all the installed extensions. Uninstall all suspicious extensions related to the unwanted program by clicking Remove.
Clear cache and web data from Chrome:
- Click on Menu and pick Settings.
- Under Privacy and security, select Clear browsing data.
- Select Browsing history, Cookies and other site data, as well as Cached images and files.
- Click Clear data.
Change your homepage:
- Click menu and choose Settings.
- Look for a suspicious site in the On startup section.
- Click on Open a specific or set of pages and click on three dots to find the Remove option.
Reset Google Chrome:
If the previous methods did not help you, reset Google Chrome to eliminate all the unwanted components:
- Click on Menu and select Settings.
- In the Settings, scroll down and click Advanced.
- Scroll down and locate Reset and clean up section.
- Now click Restore settings to their original defaults.
- Confirm with Reset settings.
Remove from Mozilla Firefox (FF)
Remove dangerous extensions:
- Open Mozilla Firefox browser and click on the Menu (three horizontal lines at the top-right of the window).
- Select Add-ons.
- In here, select the unwanted extension and click Remove.
Reset the homepage:
- Click three horizontal lines at the top right corner to open the menu.
- Choose Settings.
- Under Home, set your preferred homepage and new tab settings.
Clear cookies and site data:
- Click Menu and pick Settings.
- Go to Privacy & Security section.
- Scroll down to locate Cookies and Site Data.
- Click on Clear Data...
- Select Cookies and Site Data and Temporary cached files and pages, then click Clear.
Reset Mozilla Firefox
If clearing the browser as explained above did not help, reset Mozilla Firefox:
- Open Mozilla Firefox browser and click the Menu.
- Go to Help and then choose Troubleshooting Information.
- Under Give Firefox a tune up section, click on Refresh Firefox...
- Once the pop-up shows up, confirm the action by pressing on Refresh Firefox.
Delete from Safari
Remove dangerous extensions:
- Open Safari, click Safari in the menu at the top-left of the screen, and select Preferences.
- Go to the Extensions tab, look for any suspicious entries, and click Uninstall to remove them.
Clear history and website data:
- Click Safari in the menu and pick Clear History.
- Set Clear to all history and confirm with Clear History.
Reset Safari:
- Click Safari in the menu and select Preferences > Advanced.
- Enable Show Develop menu in menu bar.
- From the menu bar, click Develop and select Empty Caches.
Delete from macOS
To get rid of adware apps on macOS, move it to Trash as follows:
Remove the unwanted application:
- From the menu bar, select Go > Applications.
- In the Applications folder, look for any suspicious entries, then drag them to Trash (or right-click and pick Move to Trash).
Delete leftover files and folders:
- Select Go > Go to Folder.
- Enter /Library/Application Support and remove any suspicious folders related to the unwanted program.
- Repeat the same check in the /Library/LaunchAgents and /Library/LaunchDaemons folders, deleting any suspicious entries.
- Finally, empty the Trash to permanently remove the leftovers.
Access your website securely from any location
When you work on the domain, site, blog, or different project that requires constant management, content creation, or coding, you may need to connect to the server and content management service more often. The best solution for creating a tighter network could be a dedicated/fixed IP address.
If you make your IP address static and set to your device, you can connect to the CMS from any location and do not create any additional issues for the server or network manager that needs to monitor connections and activities. VPN software providers like can help you with such settings and offer the option to control the online reputation and manage projects easily from any part of the world.
Recover files after data-affecting malware attacks
While much of the data can be accidentally deleted due to various reasons, malware is one of the main culprits that can cause loss of pictures, documents, videos, and other important files.
More serious malware infections lead to significant data loss when your documents, system files, and images get encrypted. In particular, ransomware is is a type of malware that focuses on such functions, so your files become useless without an ability to access them.
Even though there is little to no possibility to recover after file-locking threats, some applications have features for data recovery in the system. In some cases, can also help to recover at least some portion of your data after data-locking virus infection or general cyber infection.
From our report of Jan 2020 · not reviewed since
You can get rid of pesky ads by eliminating TechLetterSearch from your Mac
Many computer users still believe that Macs cannot fall victim to malware, as Apple implements various built-in security measures that stop much of computer parasites.
While it is technically true, there are various ways of malicious software of entering Macs, and TechLetterSearch virus is a perfect example.
Spread with the help of fake updates, it tricks users into letting itself in, and then performs a variety of changes and drops multiple files on the system. For that reason, users may struggle with TechLetterSearch removal. If you want to terminate this potentially unwanted application manually, you should check the following folders on your macOS:
Additionally, there you should get rid of TechLetterSearch profile (if present):
However, if you do not want to bother with manual elimination, you can easily remove TechLetterSearch automatically with the help of anti-malware software - all you have to do is install it and then perform a full system scan. Note: do not forget to update definitions of security software before proceeding.
- /Library/LaunchAgents
- /Library/Application Support
- /Library/LaunchDaemons
- Go to Preferences on your Mac
- Select Profiles
- Delete an unrecognized profile by pressing "-" at the bottom left of the window
Questions about TechLetterSearch ads
What is TechLetterSearch and why is it on my PC?
TechLetterSearch is a program that was installed on the PC, most likely together with something else you downloaded. Free software sites and many installers add extra programs on setup pages with pre-ticked boxes, so the extra install looks like your choice even though nobody read the page.
Check the install date in Settings, Apps, Installed apps: the program you installed that day is the probable carrier. If you do not need TechLetterSearch, uninstall it. If it belongs to your hardware or to a program you use, search its exact name and publisher first, because drivers and their tools can have unfamiliar names.
TechLetterSearch came back after I uninstalled it. Why?
Something else is reinstalling it. Common causes are a second program from the same publisher, a scheduled task that downloads it again, or a browser extension that keeps prompting for it. Sort Installed apps by install date and uninstall each entry from the same day that you did not choose.
Then open Task Scheduler and look in the Task Scheduler Library for tasks with updater-style names that you do not recognise. Check Startup apps in Task Manager too. If TechLetterSearch still returns, start Windows in Safe Mode, uninstall it there and run a Microsoft Defender offline scan, which looks for loaders that ordinary scans can miss.
Why is my browser so slow since the ads started?
Each page now does extra work. An adware extension reads the page, decides where to put ads, loads them from ad servers and reports your visit, and that happens on every tab. Ad-supported programs add their own background activity.
Removing the extension or program usually makes the browser fast again at once. If it stays slow, open the browser's own task manager with Shift+Esc in Chrome or Edge and look for extensions using a lot of memory or processor time.
Did TechLetterSearch collect my data?
Adware typically collects what it needs to choose ads:
- the sites you visit
- search terms
- approximate location
- browser and system details
Extensions with permission to read and change data on all websites can technically see everything on those pages, including forms. That is a privacy problem rather than proof of theft.
If you typed card details or passwords while it was active, changing the most important passwords is a reasonable precaution. Clearing cookies after removal ends the tracking sessions it may have started.
My scan found nothing, but the ads continue. Why?
Because the source may not be a file a scanner looks for. Browser notifications are a permission stored in the browser, and many adware extensions are not flagged because they come from an official store.
Some ad-supported programs are only reported if you enable detection of potentially unwanted apps. So a clean scan does not mean the job is done. Check each browser's notification permissions and extension list by hand, and turn on Potentially unwanted app blocking in Windows Security before scanning again.
Can an adware pop-up infect my PC just by appearing?
No. A pop-up, a notification or a new tab is only a web page or a message. It cannot run programs on Windows by itself, provided the browser and Windows are up to date. Infection needs a step from you:
- running a downloaded file
- installing an extension
- giving a stranger remote access
That is why scam pages work so hard to make you click. Close such pages with the tab's X or by closing the browser, not with buttons inside the page, which may start a download.
I let a "support technician" from an ad connect to my PC. What should I do?
Act quickly but calmly. Disconnect the PC from the internet first, so the connection ends. Uninstall the remote access tool they asked you to install and check Installed apps for anything else added during the call.
Run a Microsoft Defender full scan and offline scan. From another device, change your e-mail and banking passwords and sign out of all sessions.
If you paid by card, bank transfer or gift card, contact your bank or the card issuer immediately, and report the scam to the police. Do not answer if they call back.
Is TechLetterSearch a virus?
Not in the strict sense: TechLetterSearch is unwanted software, classed here as an adware extension, not a self-copying virus. Security programs often label such software as adware, a potentially unwanted program or a browser hijacker.
It still needs removal, because it changes browser settings, shows ads and can lead you to unsafe pages. The larger risk is clicking an ad that leads to a fake update or scam page.
Will Fortect remove TechLetterSearch?
Fortect for Mac scans for malware and unwanted programs, and its free scan shows what it finds on your Mac before you decide anything.
For TechLetterSearch, follow the plan on this page as well: removing a launch item or an app is done in macOS itself, and a scanner cannot undo what was typed or entered on the infected Mac, such as saved passwords that were copied.
Change your passwords from another device first, and if the page tells you to erase the Mac, a scan is not a substitute. The free scan costs nothing and the full-featured product needs a license.
Sources
- Microsoft: Adobe Flash end of support on December 31, 2020 (read October 7, 2026)
- Forcepoint: What is Scareware? (read October 7, 2026)
- Google Chrome Help: Use notifications to get alerts (no longer online) (read October 7, 2026)
- FTC: How to recognize, remove and avoid malware (read October 7, 2026)
- Microsoft Learn: Microsoft Defender Offline (read October 7, 2026)