Follow:

You have been re-routed to the Trojan:Win32/Msposer.A write up because Trojan%3aWin32%2fMsposer.A has been renamed to Trojan:Win32/Msposer.A
 

Trojan:Win32/Msposer.A


Trojan:Win32/Msposer.A is a malicious program that is unable to spread of its own accord. It may perform a number of actions of an attacker's choice on an affected computer.


What to do now

To detect and remove this threat and other malicious software that may have been installed in your computer, run a full-system scan with an up-to-date antivirus product such as the following: For more information about using antivirus software, see http://www.microsoft.com/windows/antivirus-partners/.

Threat behavior

Trojan:Win32/Msposer.A is a malicious program that is unable to spread of its own accord. It may perform a number of actions of an attacker's choice on an affected computer.
Installation
Trojan:Win32/Msposer.A creates the following files on an affected computer:

  • <system folder>\ambcjj.exe
  • <system folder>\trofis.exe
  • <system folder>\trone.exe
  • <system folder>\troplu.exe

Note: <system folder> refers to a variable location that is determined by the malware by querying the Operating System. The default installation location for the System folder for Windows 2000 and NT is C:\Winnt\System32; and for XP, Vista, and 7 is C:\Windows\System32.
Payload
Contacts remote host
Trojan:Win32/Msposer.A may contact a remote host at websmtp.com.br using port 80. Commonly, malware may contact a remote host for the following purposes:
  • To report a new infection to its author
  • To receive configuration or other data
  • To download and execute arbitrary files (including updates or additional malware)
  • To receive instruction from a remote attacker
  • To upload data taken from the affected computer

This malware description was produced and published using our automated analysis system's examination of file SHA1 d7164bd9539926f74fe9c60aaf800bdfcd608a0b.

Symptoms

System changes
The following system changes may indicate the presence of this malware:

  • The presence of the following files:
  • <system folder>\ambcjj.exe
    <system folder>\trofis.exe
    <system folder>\trone.exe
    <system folder>\troplu.exe


Prevention


Alert level: Severe
First detected by definition: 1.89.1263.0
Latest detected by definition: 1.177.2066.0 and higher
First detected on: Sep 08, 2010
This entry was first published on: Sep 28, 2010
This entry was updated on: Apr 17, 2011

This threat is also detected as:
  • TROJ_LAMEWAR.VTG (Trend Micro)
  • Trojan-Downloader.Win32.Agent.epcd (Kaspersky)