Full description

Virus:	Worm/Slenfbot.94209
Date discovered:	24/01/2011
Type:	Worm
In the wild:	Yes
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Medium
Static file:	Yes
File size:	94.208 Bytes
MD5 checksum:	5A903E24CAB1AF8EAD4CABCE72D174E6
VDF version:	7.10.08.45
IVDF version:	7.11.01.237 - Monday, January 24, 2011

General Method of propagation:
   • No own spreading routine

Aliases:
   • Kaspersky: IM-Worm.Win32.Yahos.ll
   • Microsoft: Worm:Win32/Slenfbot.AKD

Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003
   • Windows Vista
   • Windows Server 2008
   • Windows 7

Side effects:
   • Lowers security settings
   • Records keystrokes
   • Registry modification
   • Opens website in web browser

Files It copies itself to the following location:
   • %WINDIR%\nvsvc32.exe

It tries to execute the following files:

– Filename:
   • %SYSDIR%\netsh.exe
using the following command line arguments: firewall add allowedprogram 1.exe 1 ENABLE

– Filename:
   • %WINDIR%\explorer.exe
using the following command line arguments: http://browseusers.myspace.com/Browse/Browse.aspx

– Filename:
   • %SYSDIR%\net.exe

– Filename:
   • %SYSDIR%\ntvdm.exe
using the following command line arguments: ntvdm.exe" -f -i1

– Filename:
   • %SYSDIR%\ntvdm.exe
using the following command line arguments: ntvdm.exe" -f -i2

– Filename:
   • %SYSDIR%\sc.exe
using the following command line arguments: config wuauserv start= disabled

– Filename:
   • %SYSDIR%\sc.exe
using the following command line arguments: sc config MsMpSvc start= disabled

Registry The following registry keys are added in order to run the processes after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "NVIDIA driver monitor"="%WINDIR%\\nvsvc32.exe"

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "NVIDIA driver monitor"="%WINDIR%\\nvsvc32.exe"

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Terminal Server\
   Install\Software\Microsoft\Windows\CurrentVersion\Run]
   • "NVIDIA driver monitor"="%WINDIR%\\nvsvc32.exe"

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

– [HKLM\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\AuthorizedApplications\List]
   • "%malware execution directory%\\%executed
      file%"="%SYSDIR%\\nvsvc32.exe:*:Enabled:NVIDIA driver monitor"

The following registry keys are changed:

Lower security settings from Internet Explorer:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   ZoneMap]
   Old value:
   • "ProxyBypass"=%user defined settings%
   • "IntranetName"=%user defined settings%
   • "UNCAsIntranet"=%user defined settings%
   New value:
   • "ProxyBypass"=dword:00000001
   • "IntranetName"=dword:00000001
   • "UNCAsIntranet"=dword:00000001

Lower security settings from Internet Explorer:

– [HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings]
   Old value:
   • "AutoConfigURL"=%user defined settings%
   New value:
   • "AutoConfigURL"=-

IRC Server: %IRC server%
Port: 1234
Channel: #!nn! test
Nickname: NEW-[GBR|00|**********|%random numbers%]
Password: xxx

– Furthermore it has the ability to perform actions such as:
    • connect to IRC server
    • disconnect from IRC server
    • Join IRC channel

Miscellaneous Internet connection:

It queries with the following names:
   • astro.ic.**********.uk
   • ale.pakibi**********.com
   • versat**********.com
   • journalofaccountan**********.com
   • transnationa**********.org
   • mas.0730**********.com
   • api.albertoshisto**********.info
   • stayonti**********.info
   • www.shearm**********.com
   • insidehigher**********.com
   • ate.lacoctele**********.net
   • www.facebo**********.com
   • browseusers.myspa**********.com
   • www.myspa**********.com
   • x.myspace**********.com
   • websitetraffics**********.com
   • qun.5**********.com
   • summer-uni-sw.**********.ch
   • shopsty**********.com
   • xxx.stopklat**********.pl
   • unclef**********.com
   • mcsp.lvengi**********.com
Accesses internet resources:
   • http://www.facebo**********.com/home.php;
      http://www.facebo**********.com/login.php;
      http://browseusers.myspa**********.com/Browse/Browse.aspx;
      http://www.myspa**********.com/browse/people;
      http://www.myspa**********.com/help/browserunsupported;
      http://x.myspace**********.com/images/BrowserUpgrade/bg_infobox.jpg;
      http://x.myspace**********.com/modules/splash/static/img/cornersSheet.png;
      http://x.myspace**********.com/images/BrowserUpgrade/icon_information.gif;
      http://x.myspace**********.com/images/BrowserUpgrade/bg_browserSection.jpg;
      http://x.myspace**********.com/images/BrowserUpgrade/browserLogos_med.jpg;
      http://174.37.200.**********/index.php

File details Programming language:
The malware program was written in MS Visual C++.

Compilation date:
Date: 23/01/2011
Time: 18:16:57

説明の挿入者 Alexander Bauer の 2011年1月26日水曜日
説明の更新者 Alexander Bauer の 2011年1月26日水曜日

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