Virus:TR/Spy.Agent.42496
Date discovered:04/09/2007
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Medium
Static file:No
File size:42.496 Bytes
VDF version:6.39.01.84
IVDF version:6.39.01.87 - Tuesday, September 4, 2007

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-PSW.Win32.Zbot.z
   •  F-Secure: Trojan-PSW.Win32.Zbot.z
   •  Panda: Trj/Wsnpoem.JA


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Disable security applications
   • Downloads files
   • Downloads a malicious file
   • Downloads malicious files
   • Drops files
   • Drops malicious files
   • Records keystrokes
   • Registry modification
   • Steals information
   • Third party control

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



The following files are created:

– %SYSDIR%\wsnpoem\audio.dll This is a non malicious text file with the following content:
   • Used for stolen data storage.

– %SYSDIR%\wsnpoem\video.dll

 Registry The following registry key is continuously in an infinite loop added in order to run the process after reboot.

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



The following registry keys are added:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Network]
   • UID = %computer name%_%hex number%

– [HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\
   Explorer]
   • "{F710FA10-2031-3106-8872-93A2B5C5C620}"=hex:f7,09,f2,0d

 Process termination List of processes that are terminated:
   • outpost.exe
   • zlclient.exe


 Backdoor The following ports are opened:

– svchost.exe on a random TCP port in order to provide a Socks 4 proxy server.
– svchost.exe on a random TCP port in order to provide a Socks 5 proxy server.
– svchost.exe on a random TCP port in order to provide backdoor capabilities.


Contact server:
The following:
   • http://**********/.c/o/cfg.bin

As a result it may send information and remote control could be provided.

Sends information about:
    • Cached passwords
    • Computer name
    • Current user
    • IP address
    • Platform ID
    • Collected information described in stealing section
    • Information about the Windows operating system


Remote control capabilities:
    • Download file
    • Execute file
    • Terminate malware
    • Upload file

 Stealing It tries to steal the following information:
– Recorded passwords used by the AutoComplete function

– It uses a network sniffer that checks for the following string:
   • CustomerServiceMenuEntryPoint?custAction=75

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

– It captures:
    • Login information

 Injection     One of the following processes:
   • winlogon.exe
   • svchost.exe


 Miscellaneous Mutex:
It creates the following Mutex:
   • __SYSTEM__91C38905__

 Rootkit Technology Hides the following:
– Its own files
– Its own registry keys


Method used:
    • Hook the Import Address Table (IAT)

Hooks the following API functions:
   • NtQueryDirectoryFile
   • GetMessageA
   • GetMessageW
   • PeekMessageW
   • PeekMessageA
   • GetClipboardData

 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 Ernest Szocs on Monday, November 19, 2007
Description updated by Ernest Szocs on Monday, November 19, 2007

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