W32/Forbot-CL

Category: Viruses and Spyware
Type: Win32 worm
Prevalence: Small Number of Reports

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W32/Forbot-CL is a worm which attempts to spread to remote network shares. It also contains backdoor Trojan functionality, allowing unauthorised remote access to the infected computer via IRC channels while running in the background as a service process.

W32/Forbot-CL copies itself to the Windows system folder as MQGUARD.EXE and creates the following registry entries in order to run itself on system startup:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Windows Network Controller
MQGUARD.EXE

HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce
Windows Network Controller
MQGUARD.EXE

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Windows Network Controller
MQGUARD.EXE

HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce
Windows Network Controller
MQGUARD.EXE

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
Windows Network Controller
MQGUARD.EXE

W32/Forbot-CL also creates its own service named "Win32" with display name "Windows Network Controller".

W32/Forbot-CL attempts to spread to network machines using various exploits including the LSASS vulnerability (see MS04-011). The worm may also spread via IRC channels.

W32/Forbot-CL may act as a proxy, delete network shares and steal keys for various software products.