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Virus:Worm/Yahos.CE
Date discovered:14/02/2011
Type:Worm
In the wild:No
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:122.880 Bytes
MD5 checksum:4d8955c4016e119b6b5b764f1fd21597
VDF version:7.10.08.191
IVDF version:7.11.03.78 - Monday, February 14, 2011

 General Aliases:
   •  Kaspersky: Trojan.Win32.Scar.dlpe
   •  F-Secure: Trojan.Win32.Scar.dlpe
   •  Bitdefender: Trojan.Generic.5734208
   •  GData: Trojan.Generic.5734208
   •  DrWeb: Trojan.DownLoader1.61197


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


Side effects:
   • Third party control
   • Drops malicious files
   • Lowers security settings
   • Registry modification

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




It tries to execute the following files:

– Filename:
   • netsh firewall add allowedprogram 1.exe 1 ENABLE


– Filename:
   • %WINDIR%\nvsvc32.exe


– Filename:
   • explorer.exe http://browseusers.myspace.com/Browse/Browse.aspx


– Filename:
   • net stop wuauserv


– Filename:
   • net stop MsMpSvc


– Filename:
   • sc config wuauserv start= disabled


– Filename:
   • sc config MsMpSvc start= disabled


– Filename:
   • net1 stop wuauserv


– Filename:
   • net1 stop MsMpSvc

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

– [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"

– [HKLM\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\CurrentControlSet\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\AuthorizedApplications\List]
   • "%executed file%"="%WINDIR%\nvsvc32.exe:*:Enabled:NVIDIA driver
      monitor"

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

Server: 77.79.**********.137
Port: 1234
Channel: #!nn!
Nickname: NEW-[USA|00|P|%number%]

 Miscellaneous Accesses internet resources:
   • http://browseusers.myspace.com/Browse/**********
   • http://174.37.200.82/**********


Mutex:
It creates the following Mutexes:
   • oleacc-msaa-loaded
   • Nvidia Drive Mon

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


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 Monday, May 16, 2011
Description updated by Petre Galan on Monday, May 16, 2011

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