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Virus:TR/Spy.ZBot.ajmi
Date discovered:20/05/2010
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:135.680 Bytes
MD5 checksum:fb0d8c9f418e989d602b5a51895a118d
IVDF version:7.10.07.145 - Thursday, May 20, 2010

 General Method of propagation:
    Autorun feature


Aliases:
   •  Sophos: Mal/EncPk-HO
   •  Bitdefender: Trojan.Generic.3999969
   •  Panda: Trj/Sinowal.XDY
   •  Eset: Win32/Spy.Zbot.JF


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://cribrejist.kz/bin/**********

 Registry It creates the following entry in order to bypass the Windows XP firewall:



The following registry keys are added:

[HKEY_USERS\S-1-5-20\SOFTWARE\Microsoft\
   Protected Storage System Provider\S-1-5-20]
   • "Migrate"=dword:0x00000002

[HKEY_USERS\S-1-5-20\Software\Microsoft\
   Protected Storage System Provider\S-1-5-20\Data 2\Windows]
   • "Value"=hex:01,00,00,00,1C,00,00,00,03,00,00,00,AE,11,D9,A4,19,4C,7C,89,F4,DC,40,63,72,FA,99,0C,7E,6F,CF,6B,CE,E9,10,E8,10,00,00,00,89,3D,50,AD,A5,CF,68,A8,24,AE,9C,50,4F,CE,FB,3C,14,00,00,00,C6,6E,5C,0C,61,D1,67,62,E7,97,8F,47,ED,6F,87,F9,41,C0,9B,C5

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

[HKEY_USERS\.DEFAULT\software\microsoft\windows\currentversion\
   explorer\{4776C4DC-E894-7C06-2148-5D73CEF5F905}]
   • "{3039636B-5F3D-6C64-6675-696870667265}"=hex:F7,09,F2,0D
   • "{33373039-3132-3864-6B30-303233343434}"=hex:F7,09,F2,0D
   • "{6E633338-267E-2A79-6830-386668666866}"=hex:F7,09,F2,0D

[HKEY_USERS\.DEFAULT\Software\Microsoft\
   Protected Storage System Provider\S-1-5-18\Data 2\Windows]
   • "Value"=hex:01,00,00,00,1C,00,00,00,03,00,00,00,35,6B,3C,5E,4C,C4,FA,8A,17,AA,F8,52,A4,0B,23,AE,CD,A7,49,5A,FB,41,04,D0,10,00,00,00,61,3F,52,CF,09,4C,D5,05,1E,63,F7,0A,42,AE,EF,A7,14,00,00,00,DA,21,7E,8C,7A,0D,DC,C5,43,79,5E,74,8A,F2,95,21,AF,2B,F3,0F

[HKEY_USERS\.DEFAULT\software\microsoft\windows\currentversion\
   explorer\{43BF8CD1-C5D5-2230-7BB2-98F22C2B7DC6}]
   • "{3039636B-5F3D-6C64-6675-696870667265}"=hex:F7,09,F2,0D
   • "{33373039-3132-3864-6B30-303233343434}"=hex:F7,09,F2,0D
   • "{6E633338-267E-2A79-6830-386668666866}"=hex:F7,09,F2,0D

[HKEY_USERS\.DEFAULT\SOFTWARE\Microsoft\
   Protected Storage System Provider\S-1-5-18]
   • "Migrate"=dword:0x00000002

[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"



The following registry keys are changed:

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

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

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

 Network Infection Exploit:
It makes use of the following Exploit:
– MS04-007 (ASN.1 Vulnerability)

 Stealing It tries to steal the following information:

A logging routine is started after a website is visited:
   • https://onlineeast.bankofamerica.com/cgi-bin/ias/*/GotoWelcome

 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 Monday, October 4, 2010
Description updated by Andrei Ivanes on Friday, October 8, 2010

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