Full description

Virus:	Worm/Yimfoca.A.38
Date discovered:	18/05/2011
Type:	Worm
In the wild:	Yes
Reported Infections:	Low to medium
Distribution Potential:	Low to medium
Damage Potential:	Medium
Static file:	Yes
File size:	46.592 Bytes
MD5 checksum:	bc9ef86be61af1a78e4af6f95cf4b82e
VDF version:	7.11.08.60 - Wednesday, May 18, 2011
IVDF version:	7.11.08.60 - Wednesday, May 18, 2011

General Method of propagation:
   • Messenger

Aliases:
   • Kaspersky: Trojan.Win32.Buzus.hgrb
   • F-Secure: Trojan.Win32.Buzus.hgrb
   • Bitdefender: Trojan.Generic.5748790
   • GData: Trojan.Generic.5748790
   • DrWeb: Trojan.DownLoader2.61692

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"

Messenger It is spreading via Messenger. The characteristics are described below:

– Windows Messenger
– Yahoo Messenger

The URL then refers to a copy of the described malware. If the user downloads and executes this file the infection process will start again.

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

Server: 75.102.**********.40
Port: 1866
Channel: #!high!
Nickname: NEW-[USA|00|P|%number%]

Injection – It injects a process watching routine into a process.

Process name:
• explorer.exe

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

Mutex:
It creates the following Mutex:
   • 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.

說明撰寫者 Petre Galan 開啟 2011年6月28日星期二
說明更新者 Petre Galan 開啟 2011年6月28日星期二

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