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Virus:Worm/Leave.AQ
Date discovered:15/09/2010
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium to high
Damage Potential:Medium
Static file:Yes
File size:51.285 Bytes
MD5 checksum:ea3c9aaab2319f66f491e1c9185669da
VDF version:7.10.05.46
IVDF version:7.10.11.187 - Wednesday, September 15, 2010

 General Methods of propagation:
    Autorun feature
    Infects files


Aliases:
   •  Mcafee: W32/Ramnit
   •  Kaspersky: Worm.Win32.Leave.aq
   •  Sophos: Mal/FakeAV-BT
   •  Bitdefender: Win32.Ramnit.D
   •  Panda: W32/Ramnit.B.drp
     GData: Win32.Ramnit.D


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:
   • %PROGRAM FILES%\Microsoft\DesktopLayer.exe
   • %drive%\RECYCLER\autorun.exe



The following files are created:

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

%PROGRAM FILES%\Internet Explorer\dmlconf.dat



It tries to execute the following files:

Filename:
   • %PROGRAM FILES%\Microsoft\DesktopLayer.exe


Filename:
   • %PROGRAM FILES%\Internet Explorer\IEXPLORE.EXE

 Registry The following registry key is changed:

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


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


Method:

This direct-action infector actively searches for files.


The following files are infected:

By file type:
   • html (+103052) -> HTML/Drop.Agent.AB
   • exe (+52736) -> W32/Ramnit.A
   • dll (+52736) -> W32/Ramnit.A

 Backdoor Contact server:
The following:
   • zah**********.name:443 (TCP)


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

    Process name:
   • iexplore.exe


 Miscellaneous  Checks for an internet connection by contacting the following web sites:
   • google.com:80
   • bing.com:80
   • yahoo.com:80


Mutex:
It creates the following Mutex:
   • KyUffThOkYwRRtgPP

 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Petre Galan on Thursday, April 7, 2011
Description updated by Petre Galan on Thursday, April 7, 2011

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