Sophos

W32/Forbot-BA

Category
Type
What to do
Prevalence low high

Summary

 
How it spreads
  • Network shares
Affected operating systems Windows
Characteristics
  • Installs itself in the registry
Included in our products from December 2004 (3.88)
Protection available since 11 October 2004 10:26:02 (GMT)
Detected by All Sophos products

Action

Please follow the instructions for removing worms.

You will also need to edit the following registry entries, if they are present. Please read the warning about editing the registry.

At the taskbar, click Start|Run. Type 'Regedit' and press Return. The registry editor opens.

Before you edit the registry, you should make a backup. On the 'Registry' menu, click 'Export Registry File'. In the 'Export range' panel, click 'All', then save your registry as Backup.

Locate the HKEY_LOCAL_MACHINE entries:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce\
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\

and remove any reference to any file you deleted.

Each user has a registry area named HKEY_USERS\[code number indicating user]\. For each user locate the entries:

HKU\[code number]\Software\Microsoft\Windows\
CurrentVersion\Run\

HKU\[code number]\Software\Microsoft\Windows\
CurrentVersion\RunOnce\

and remove any reference to any file you deleted.

Close the registry editor.

More Information

W32/Forbot-BA 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-BA 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-BA copies itself to the Windows system folder as SysDebug.exe and creates entries in the registry at the following locations so as to run itself on system startup:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
Auto updat = "SysDebug.exe"

HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce\
Auto updat = "SysDebug.exe"

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\
Auto updat = "SysDebug.exe"

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\
Auto updat = "SysDebug.exe"

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices\
Auto updat = "SysDebug.exe"

W32/Forbot-BA also creates its own service with the display name "Auto updat".

W32/Forbot-BA attempts to spread to network machines using various exploits. W32/Forbot-BA may act as a proxy, delete network shares and steal keys for various software products.

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