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TrojanDownloader:Win32/Simdown.A


Microsoft security software detects and removes this threat.

This threat downloads and installs other programs onto your PC without your consent, including other malware.



What to do now

The following free Microsoft software detects and removes this threat:

Even if we've already detected and removed this particular threat, running a full scan might find other malware that is hiding on your PC.

You can also visit the Microsoft virus and malware community for more help.

Threat behavior

Installation
TrojanDownloader:Win32/Simdown.A creates the following files on your PC:

  • c:\documents and settings\administrator\application data\flash\first.vbs
  • c:\documents and settings\administrator\application data\flash\flashcl.exe
  • c:\documents and settings\administrator\application data\flash\flashsec.exe
  • c:\documents and settings\administrator\application data\flash\flashup.exe
  • c:\documents and settings\administrator\application data\flash\info.txt
  • c:\documents and settings\administrator\application data\flash\startcl.vbs
  • c:\documents and settings\administrator\application data\flash\startsec.vbs
  • c:\documents and settings\administrator\application data\flash\update.vbs
  • c:\documents and settings\administrator\application data\flash\updatecl.vbs
  • c:\documents and settings\administrator\application data\flash\updatesec.vbs
Payload
Contacts remote host
 
TrojanDownloader:Win32/Simdown.A might contact a remote host at 5.149.248.85 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 55b13d22932b7b77eac3512b21eea40e776a94f1.

Symptoms

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

  • You have these files:

    c:\documents and settings\administrator\application data\flash\first.vbs
    c:\documents and settings\administrator\application data\flash\flashcl.exe
    c:\documents and settings\administrator\application data\flash\flashsec.exe
    c:\documents and settings\administrator\application data\flash\flashup.exe
    c:\documents and settings\administrator\application data\flash\info.txt
    c:\documents and settings\administrator\application data\flash\startcl.vbs
    c:\documents and settings\administrator\application data\flash\startsec.vbs
    c:\documents and settings\administrator\application data\flash\update.vbs
    c:\documents and settings\administrator\application data\flash\updatecl.vbs
    c:\documents and settings\administrator\application data\flash\updatesec.vbs
 

Prevention


Alert level: Severe
First detected by definition: 1.167.1914.0
Latest detected by definition: 1.173.2181.0 and higher
First detected on: Mar 14, 2014
This entry was first published on: Mar 16, 2014
This entry was updated on: Mar 20, 2014

This threat is also detected as:
No known aliases