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Virus:TR/Spy.ZBot.afnt
Date discovered:21/05/2010
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:137.216 Bytes
MD5 checksum:e43aa428d8f1dcc2698450f8b0897eda
IVDF version:7.10.03.54

 General Method of propagation:
    Autorun feature


Aliases:
   •  Sophos: Mal/Generic-E
   •  Bitdefender: Trojan.Generic.4304095
   •  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:
   • %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



It tries to download a file:

The location is the following:
   • http://xee1aeph2aay.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\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\
   Protected Storage System Provider\S-1-5-20\Data 2\Windows]
   • "Value"=hex:01,00,00,00,1C,00,00,00,03,00,00,00,64,0D,A8,6F,10,A0,71,8E,4E,E9,1C,C3,53,97,61,07,EC,9B,BF,90,F3,37,86,2E,10,00,00,00,DB,BA,31,A6,A7,8B,50,80,63,5F,2B,88,9E,BC,52,64,14,00,00,00,80,30,1E,A0,21,18,2F,C4,04,72,C9,C9,5B,F6,9D,88,D5,65,71,F7

[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,F6,BD,E9,EF,E6,BD,67,C8,FC,73,00,6E,C2,0D,F7,73,4A,59,49,4E,28,B7,7E,2C,10,00,00,00,E2,96,7F,78,01,CF,44,73,D0,B7,FA,36,F3,AB,D0,7B,14,00,00,00,DF,9D,82,E9,40,7A,0E,0A,5C,04,2F,05,4C,22,73,48,A3,CC,4A,A6

[HKEY_USERS\S-1-5-19\SOFTWARE\Microsoft\
   Protected Storage System Provider\S-1-5-19]
   • "Migrate"=dword:0x00000002

[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\S-1-5-19\Software\Microsoft\
   Protected Storage System Provider\S-1-5-19\Data 2\Windows]
   • "Value"=hex:01,00,00,00,1C,00,00,00,03,00,00,00,72,54,8A,F7,89,AC,53,2A,30,D6,31,A2,BD,16,AD,53,91,4C,4C,ED,B1,82,5C,DE,10,00,00,00,6C,8C,A9,0F,A7,7D,7B,C2,59,5F,62,9C,3F,E3,18,7A,14,00,00,00,AD,02,2E,92,33,6D,10,51,9F,2E,81,05,10,5E,97,C8,D1,5D,3C,33

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

[HKEY_USERS\.DEFAULT\software\microsoft\windows\currentversion\
   explorer\{3446AF26-B8D7-199B-4CFC-6FD764CA5C9F}]
   • "{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



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-1-5-19\Software\Microsoft\Windows NT\CurrentVersion\
   Winlogon]
   New value:
   • "ParseAutoexec"="1"

[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:
 Passwords typed into 'password input fields'

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 Thursday, September 30, 2010
Description updated by Andrei Ivanes on Friday, October 1, 2010

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