Threat Description

Backdoor: W32/SdBot.CNJ


Category: Malware
Type: Backdoor
Platform: W32
Aliases: Backdoor:W32/SdBot.CNJ, Trojan.Win32.Agent.asdj, W32.Ackantta@mm (Symantec), W32/Autorun-RI (Sophos), W32/Xirtem@MM (McAfee), VirTool:Win32/CeeInject.gen!K (Microsoft)


Backdoor:W32/SdBot.CNJ is a piece of malicious software that tries to disable various firewalls and antivirus programs, steal passwords from the infected machine and spread through removable media devices.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Technical Details

Process Changes

Creates these processes:

  • %cwd%\[filename].exe
  • %programfiles%\Internet
  • Explorer\IEXPLORE.EXE/[filename]

Creates these mutexes:

  • Y_aKS~pXq1MKTN4PE
Network Connections

Attempts to connect with HTTP to:

  • Web1.(censored)[removed].org:443/TCP
Registry Modifications

Sets these values:

  • HKCU\Software\Microsoft\Windows NT\CurrentVersion (default) = h1Ucm{yQvor}^imlol|Pxhc|en isl
  • HKCU\Software\Microsoft\Windows\CurrentVersion\Run QnX = c:\(path)\[filename].(filename)exe
  • HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\{77520Q86-864L-N81R-0R2W-7U2G0P22436U} StubPath = "c:\(path)\.(filename)exe"
  • HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run QnX =c:\(path)\.(filename)exe

Creates these keys:

  • HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\{77520Q86-864L-N81R-0R2W-7U2G0P22436U}


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