Virus:TR/Spy.ZBot.aiun
Date discovered:25/04/2010
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:141.312 Bytes
MD5 checksum:38e516b572117c4932c20e020ed7aae7
IVDF version:7.10.06.198 - Sunday, April 25, 2010

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Bitdefender: Trojan.Generic.KD.8646
   •  Panda: Trj/Sinowal.XAO
   •  Eset: Win32/Spy.Zbot.YW


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


Side effects:
   • Downloads a malicious file
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following locations:
   • %SYSDIR%\sdra64.exe
   • %drive%\%executed file%



The following files are created:

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

– %SYSDIR%\lowsec\user.ds
– %SYSDIR%\lowsec\local.ds
– %SYSDIR%\lowsec\user.ds.lll



It tries to download a file:

– The location is the following:
   • http://zmagazine.ru/798iodas/**********

 Registry The following registry key is added in order to run the process after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   • "userinit"="%SYSDIR%\userinit.exe,%SYSDIR%\sdra64.exe,"



The following registry keys are added:

– [HKEY_USERS\S-1-5-19\Software\Microsoft\Windows NT\CurrentVersion\
   Network]
   • "UID"="%computer name%_7875768FCFF3ECE1"

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Network]
   • "UID"="%computer name%_7875768FCFF3ECE1"

– [HKEY_USERS\S-1-5-20\Software\Microsoft\Windows NT\CurrentVersion\
   Network]
   • "UID"="%computer name%_7875768FCFF3ECE1"

– [HKEY_USERS\.DEFAULT\Software\Microsoft\Windows NT\CurrentVersion\
   Winlogon]
   • "ParseAutoexec"="1"

– [HKEY_USERS\S-1-5-20\Software\Microsoft\Windows NT\CurrentVersion\
   Winlogon]
   • "ParseAutoexec"="1"

 Backdoor The following port is opened:

– 239.255.25**********.250 on UDP port 1900 M-SEARCH * HTTP/1.1

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

    Process name:
   • winlogon.exe



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

    Process name:
   • svchost.exe



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

It is injected into all processes.


 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 Friday, August 27, 2010
Description updated by Petre Galan on Friday, August 27, 2010

Back . . . .