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Date discovered:01/11/2010
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium to high
Damage Potential:Medium
Static file:Yes
File size:51.200 Bytes
MD5 checksum:b8639c44126fb50de80354b95fad0153
VDF version:
IVDF version:

 General Methods of propagation:
   • Autorun feature
   • Infects files

   •  Kaspersky: Backdoor.Win32.IRCNite.bwx
   •  Sophos: Troj/Zbot-ADH
   •  Bitdefender: Trojan.Generic.5029516
   •  Panda: W32/Ramnit.B.drp
   •  GData: Trojan.Generic.5029516

Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Drops malicious files
   • Infects files
   • Registry modification

 Files It copies itself to the following locations:
   • %drive%\RECYCLER\svchost.exe
   • %PROGRAM FILES%\Microsoft\WaterMark.exe

The following files are created:

%drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%


It tries to execute the following files:

– Filename:
   • %PROGRAM FILES%\Microsoft\WaterMark.exe

– Filename:
   • %SYSDIR%\svchost.exe

 Registry The following registry key is changed:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   New value:
   • "Userinit"="%SYSDIR%\userinit.exe,,%PROGRAM FILES%\microsoft\watermark.exe"

 File infection Infector type:

Appender - The virus main code is added at the end of the infected file.
– The following section is added to the infected file:
   • .rmnet

No stealth techinques used. It modifies the OEP (Original Entry Point) of the infected file to point to the virus code.


This direct-action infector actively searches for files.

The following files are infected:

By file type:
   • exe (+52736) -> W32/Ramnit.A
   • dll (+52736) -> W32/Ramnit.A
   • html (+102882) -> HTML/Drop.Agent.AB

 Backdoor Contact server:
All of the following:
   • zah**********.name:443 (TCP)
   • tyb**********.com:443 (TCP)

 Injection – It injects itself as a remote thread into a process.

    Process name:
   • svchost.exe

 Miscellaneous  Checks for an internet connection by contacting the following web sites:

Description inserted by Petre Galan on Monday, April 11, 2011
Description updated by Petre Galan on Monday, April 11, 2011

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