Remove Ryknos. Description and removal instructions

Title: Ryknos
Type: Backdoors	Severity scale: (75 / 100)

Ryknos is an IRC-controlled backdoor that provides the attacker with unauthorized remote access to a compromised computer. The intruder can download and execute arbitrary files, retrieve system and network information, send messages to specified remote hosts. The threat silently downloads from the Internet and installs another backdoor called Looksky.b. Ryknos uses the infamous First4DRM rootkit to cloak itself in the system. It is able to bypass Windows Firewall. The backdoor attempts to automatically run on every Windows startup, but fails.

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Ryknos properties:
• Allows remote user connection
• Connects itself to the internet
• Hides from the user
• Stays resident in background

Automatic Ryknos removal:

remover for Ryknos

Ryknos manual removal:

Kill processes:
$sys$drv.exe, bk.exe

HELP:
how to kill malicious processes

Delete registry values:
HKEY_CURRENT_USER\[long string of random characters]\$sys$drv=$sys$drv.exe

HELP:
how to remove registry entries

Delete files:
$sys$drv.exe, bk.exe

HELP:
how to remove harmful files

Misc:
The threat can infect any system except for those, where First4DRM is already installed from Sony BMG content-protected music CDs.

The bk.exe file installs the Looksky.b backdoor.

The $sys$drv.exe file can be found in default system directory, which is one of the following: C:\Windows\System, C:\Windows\System32, C:\Winnt\System32.

Other programs to remove Ryknos:

• Malwarebytes Anti Malware - Review - Download
• Malwarebytes Anti Malware - Review - Download
• Windows Defender - Review - Download

Information added: 11/11/05
Information updated: 11/11/05

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