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Trojan:Win32/Pyrtomsop.A

First posted on 27 May 2014.
Source: Microsoft

Aliases :

There are no other names known for Trojan:Win32/Pyrtomsop.A.

Explanation :

Threat behavior

Installation

Trojan:Win32/Pyrtomsop.A copies itself to %ProgramFiles%\nmrv\sytsomo.exe. The malware changes the following registry entries so that it runs each time you start your PC:

In subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Sets value: "sytsomo"
With data: "c:\program files\nmrv\sytsomo.exe" The malware creates the following files on your PC:

• %ProgramFiles% \nmrv\sys.dll
• c:\documents and settings\administrator\local settings\temp\d41d8cd98f00b204e9800998ecf8427e.zip

Payload

Contacts remote host

Trojan:Win32/Pyrtomsop.A might contact a remote host at r.qzone.qq.com using port 80. Commonly, malware does this to:

• Report a new infection to its author
• Receive configuration or other data
• Download and run files, including updates or other malware
• Receive instructions from a remote hacker
• Upload data taken from your PC

This malware description was produced and published using automated analysis of file SHA1 ed501cbc806cb36e9926a1c8857c4700cb9fce95.Symptoms

System changes

The following could indicate that you have this threat on your PC:

• You have these files:
  
  %programfiles%\nmrv\sys.dll
  %programfiles%\nmrv\sytsomo.exe
  c:\documents and settings\administrator\local settings\temp\d41d8cd98f00b204e9800998ecf8427e.zip

• You see these entries or keys in your registry:
  
  Sets value: "sytsomo"
  With data: "c:\program files\nmrv\sytsomo.exe"
  In subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

Last update 27 May 2014

 

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