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Virus:WORM/Ainslot.A.1043
Date discovered:13/06/2011
Type:Worm
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
File size:458.752 Bytes
MD5 checksum:9E01CD128AD3351DB3169B36BF35B7CC
VDF version:7.11.09.166 - Monday, June 13, 2011
IVDF version:7.11.09.166 - Monday, June 13, 2011

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Symantec: WS.Reputation.1
   •  Mcafee: Artemis!9E01CD128AD3
   •  Kaspersky: Trojan.Win32.VBKrypt.dihq
   •  TrendMicro: TROJ_GEN.RC1C2FF


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
    Windows Vista
    Windows 7


Side effects:
   • Drops files
   • Registry modification

 Files It copies itself to the following locations:
   • %APPDATA%\winlogon\winlogon.exe
   • %APPDATA%\win32.exe



The following files are created:

%TEMPDIR%\nNrlM.bat Contains parameters used by the malware.
%APPDATA%\data.dat This file serves as flag for an internal routine.



It tries to download a file:

The location is the following:
   • dl.dropbox.**********/u/18791596/bstop.exe
At the time of writing this file was not online for further investigation.

 Registry The following registry key is added:

[HKEY_CURRENT_CONFIG\Software\Microsoft\windows\CurrentVersion\
   Internet Settings]
   • "ProxyEnable"=dword:00000000

 Miscellaneous Accesses internet resources:
   • 2fail4you.no-ip.info

 File details Programming language:
The malware program was written in MS Visual C++.


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

Description inserted by Andrei Ilie on Tuesday, July 26, 2011
Description updated by Andrei Ilie on Tuesday, July 26, 2011

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