W32/Sdranck-C

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\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 entry:

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

and remove any reference to any file you deleted.

Close the registry editor.

W32/Sdranck-C is a Windows worm that spreads via network shares, drops files and contains backdoor functions that allow unauthorised remote access to the infected computer via IRC channels.

The worm will also try to download and run files from the internet, terminate processes and add or delete network shares when instructed to do so by a remote attacker.

When run, the delivery component of the worm drops the files imaxavos.exe (the worm core) and ikusefote.exe into the C:\WINNT\SYSTEM32 folder and then proceeds to run both files.

ikusefote.exe is detected by Sophos as Troj/Ranck-CP.

imaxavos.exe is being detected by Sophos as W32/Sdranck-C. W32/Sdranck-C is a Windows worm that spreads via network shares, drops files and contains backdoor functions that allow unauthorised remote access to the infected computer via IRC channels.

When run, the delivery component of the worm drops the files imaxavos.exe (the worm core) and ikusefote.exe into the C:\WINNT\SYSTEM32 folder and then proceeds to run both files.

ikusefote.exe is detected by Sophos as Troj/Ranck-CP.

imaxavos.exe is being detected by Sophos as W32/Sdranck-C.

When imaxavos.exe is executed it copies itself to the Windows System folder as ihotunib.exe.

W32/Sdranck-C then creates the following registry entries so that it is able to run on user logon:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Adiliwut
ihotunib.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
Adiliwut
ihotunib.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Adiliwut
ihotunib.exe

The worm will also try to download and run files from the internet, terminate processes and add or delete network shares when instructed to do so by a remote attacker.

W32/Sdranck-C attempts to copy itself to network shares using the main dropper component filename rudim.exe.