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Virus:TR/Spy.ZBot.BU
Date discovered:14/05/2008
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:105.984 Bytes
MD5 checksum:584c300c665edeed44c467571e99ad59
IVDF version:7.00.04.37 - Wednesday, May 14, 2008

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Bitdefender: Trojan.Generic.KD.17108
   •  Panda: Trj/Sinowal.XDY
   •  Eset: Win32/Spy.Zbot.JF


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


Side effects:
   • Drops malicious files
   • Registry modification

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



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

 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

– [HKEY_USERS\.DEFAULT\Software\Microsoft\
   Protected Storage System Provider\S-1-5-18\Data 2\Windows]
   • "Value"=hex:01,00,00,00,1C,00,00,00,03,00,00,00,2C,3F,19,91,9B,FA,E1,E9,14,E7,0A,FB,FD,4A,74,75,23,A8,33,1A,55,E3,E0,A2,10,00,00,00,88,F2,ED,F5,9C,51,81,3E,99,80,43,85,7D,A5,4F,7D,14,00,00,00,21,13,EF,3B,1A,89,46,5F,E1,56,E2,9E,D5,E6,B2,4F,12,86,2E,CF

– [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

– [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 Friday, October 1, 2010
Description updated by Andrei Ivanes on Friday, October 8, 2010

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