Virus:Worm/Zhelatin.ZI
Date discovered:22/07/2008
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low
Static file:No
File size:90624 Bytes
MD5 checksum:a9d0ed60fec2530a497554de364d5693
IVDF version:7.00.05.148 - Tuesday, July 22, 2008

 General Methods of propagation:
   • Email
   • Local network


Aliases:
   •  Kaspersky: Email-Worm.Win32.Zhelatin.aep
   •  Bitdefender: Dropped:Rootkit.Agent.AITJ


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


Side effects:
   • Drops files

 Files The following files are created:

– %WINDIR%\glok+serv.config This is a non malicious text file with the following content:
   • [config]
     [local]
     [peers]
     0000472DD17ECA4C2F0BB96FD7794A73=D9DA078C2AD400
     01006023137DA429CD240A468A5CFB77=D3F6E118166700
     0200AA5495413422502AAA57FB00CB2C=CA803A63585600
     0300EA776E0AA0591202531C3F0D4F53=7647B0A8321700
     04001B29A86C3570BF00D7351501460F=5C2E073C265300
     0500A71EC719C622B27ADE6BE2416463=C879C5BC09A100
     06001709255A3721431D0E69732E9551=3A4049CE049D00
     0700F41EF75A8D012D7D1F0C894B2F55=7C6B254D23A300
     0800BA60242320060233666E5C135067=3D11CBE4206900
     09004D0B336B44757A3D475AB0355C6D=76449C14337400
     0A0011554065B727F03B167C971C3136=599789651ABE00
     0B0082735501391F296AFA369A3BA822=DEE1913F504B00
     0C00387F7570B2105E017737C1283A7A=7B1600401B3300
     0D00F67D3654AC6C35099F55A41C6E67=44979EC5589400
     

– %WINDIR%\glok+22bd-6274.sys Furthermore it gets executed after it was fully created. Detected as: TR/Rootkit.Gen

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

– HKLM\System\ControlSet001\Services\glok+b89-6227
   • %WINDIR%\glok+b89-6227.sys

 Mailing Avoid addresses:
It does not send emails to addresses containing one of the following strings:
   • postmaster@; root@; @avp.; panda; abuse; @messagelab; free-av; @foo;
      ntivi; admin; kasp; noone@; info@; help@; f-secur; @microsoft; rating@

 Network Infection In order to ensure its propagation the malware attemps to connect to other machines as described below.


IP address generation:
It creates random IP addresses and tries to establish a connection with them.

 Rootkit Technology It is a malware-specific technology. The malware hides its presence from system utilities, security applications and in the end, from the user.


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

– The following files:
   • glok+22bd-6274.sys
   • glok+serv.config

– The following registry keys:
   • HKLM\System\ControlSet001\Services\glok+b89-6227
   • HKLM\System\ControlSet001\Enum\Root\legacy_glok+b89-6227
   • HKLM\System\ControlSet001\Enum\Root\LEGACY_GLOK+B89-6227\0000


Method used:
    • Hidden from Interrupt Descriptor Table (IDT)

Hooks the following API functions:
   • ZwEnumerateKey
   • ZwEnumerateValueKey
   • ZwQueryDirectoryFile

 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 Viktor Graeber on Tuesday, July 22, 2008
Description updated by Viktor Graeber on Tuesday, July 22, 2008

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