Need help? Ask the community or hire an expert.
Go to Avira Answers
Virus:Worm/Yahos.jg
Date discovered:09/01/2011
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:74.240 Bytes
MD5 checksum:C0F09FB591003913164ADA03F44C126A
IVDF version:7.11.01.58 - Sunday, January 9, 2011

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Mcafee: Artemis!C0F09FB59100
   •  Kaspersky: IM-Worm.Win32.Yahos.jg
   •  F-Secure: IM-Worm.Win32.Yahos.jg
   •  Sophos: Mal/Rimecud-D
   •  Avast: Win32:Palevo-AJ
   •  Panda: Trj/CI.A
   •  VirusBuster: I-Worm.Yahos!XtwXFzuAcm4
   •  Eset: Win32/Yimfoca.AA worm
   •  AhnLab: Win-Trojan/Buzus.74240.BJ


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:
   • Drops files
   • Lowers security settings
   • Records keystrokes
   • Registry modification
   • Opens website in web browser

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



The following files are created:

– Non malicious files:
   • %cookies%\makrorechner@facebook[1].txt
   • %temporary internet files%\Content.IE5\I1EFMT07\index[1].htm
   • %WINDIR%\ndl.dl
   • %WINDIR%\wiybr.png
   • %WINDIR%\wibrf.jpg




It tries to execute the following files:

– Filename:
   • %WINDIR%\system32\net.exe
using the following command line arguments: stop


– Filename:
   • %WINDIR%\system32\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:
   • %WINDIR%\nvsvc32.exe


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


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


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


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


– Filename:
   • %SYSDIR%\ntvdm.exe
using the following command line arguments: -f -i3

 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"



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

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

Lower security settings from Internet Explorer:

– [HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings]
   Old value:
   • "MigrateProxy"=%user defined settings%
   • "ProxyEnable"=%user defined settings%
   • "ProxyServer"=%user defined settings%
   • "ProxyOverride"=%user defined settings%
   • "AutoConfigURL"=-%user defined settings%
   New value:
   • "MigrateProxy"=dword:00000001
   • "ProxyEnable"=dword:00000000
   • "ProxyServer"=-
   • "ProxyOverride"=-
   • "AutoConfigURL"=-

Lower security settings from Internet Explorer:

– [HKEY_CURRENT_CONFIG\Software\Microsoft\windows\CurrentVersion\
   Internet Settings]
   Old value:
   • "ProxyEnable"=%user defined settings%
   New value:
   • "ProxyEnable"=dword:00000000

– [HKCR\TypeLib\{1EA4DBF0-3C3B-11CF-810C-00AA00389B71}\1.1\0\win32]
   Old value:
   • "(Default)"=%user defined settings%
   New value:
   • "(Default)"="oleacc.dll"

 IRC To deliver system information and to provide remote control it connects to the following IRC Server:

Server: 205.234.145.**********
Port: 1234
Channel: !nn! te**********
Nickname: NEW-[GBR|00|P|**********
Password: xxx

 Miscellaneous Internet connection:

It queries with the following names:
   • astro.ic.**********.uk
   • ale.pakibi**********.com
   • versat**********.com
   • journalofaccoun**********.com
   • transnation**********.org
   • mas.0730**********.com
   • api.albertoshist**********.info
   • browseusers.mysp**********.com
   • www.mysp**********.com
   • www.faceb**********.com
   • x.myspace**********.com
   • stayonti**********.info
   • www.shear**********.com
   • insidehighe**********.com
   • ate.lacoctel**********.net
   • websitetraffic**********.com
   • qun.51.**********
   • summer-uni-sw.**********.ch
   • shopst**********.com
   • xxx.stopklat**********.pl
Accesses internet resources:
   • http://browseusers.myspa**********.com/Browse/Browse.aspx;
      http://www.myspa**********.com/browse/people;
      http://www.myspa**********.com/help/browserunsupported;
      http://www.facebo**********.com/home.php;
      http://www.facebo**********.com/login.php;
      http://x.myspace**********.com/modules/splash/static/img/cornersSheet.png;
      http://x.myspace**********.com/images/BrowserUpgrade/bg_infobox.jpg;
      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: 09/01/2011
Time: 06:38:49

Description inserted by Alexander Bauer on Tuesday, January 11, 2011
Description updated by Alexander Bauer on Wednesday, January 12, 2011

Back . . . .