Virus:TR/NSAnti.A.257
Date discovered:11/04/2006
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:37.376 Bytes
MD5 checksum:dbcc7870fb82efce39ac9deb5a825b30
VDF version:6.34.00.173
IVDF version:6.34.00.175 - Wednesday, April 12, 2006

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Symantec: Infostealer.Lineage
   •  Mcafee: PWS-Lineage
   •  Kaspersky: Trojan-PSW.Win32.Lineage.mz
   •  TrendMicro: TSPY_LINEAGE.AIK
   •  Sophos: Troj/Lineage-OC
   •  VirusBuster: trojan Trojan.PWS.Lineage.KJ
   •  Bitdefender: Trojan.NSAnti.B


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows ME


Side effects:
   • Drops a file
   • Records keystrokes
   • Steals information

 Files It copies itself to the following location:
   • %SYSDIR%\kerne121.exe



It deletes the initially executed copy of itself.



The following files are created:

– %SYSDIR%\microsoftie21.dll Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too.
– %malware execution directory%\$$A$$.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.

 Registry One of the following values is added in order to run the process after reboot:

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Kerne121"="%SYSDIR%\Kerne121.exe"

 Backdoor Sends information about:
    • Computer name
    • Created logfiles
    • Collected information described in stealing section

 Stealing It tries to steal the following information:
    • Login information

 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 Gabriel Mustata on Tuesday, September 19, 2006
Description updated by Andrei Ivanes on Tuesday, September 19, 2006

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