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TrojanDownloader:MSIL/Runtk.A

First posted on 17 August 2015.
Source: Microsoft

Aliases :

There are no other names known for TrojanDownloader:MSIL/Runtk.A.

Explanation :

Threat behavior

Installation

We observed that this threat is often detected in your downloads folder (%UserProfile%\Downloads) with the following names and file extension:

• Images.png (Example, Image487256874568347658.png)
• Images.png.exe (Example, Image49465734439757683457.png.exe)

Note: This list is not exhaustive.



Payload


Downloads malware or unwanted software

This threat can download other malware and unwanted software onto your PC.



Connects to a remote host

We have seen this threat connect to a remote host, including:

• pipperrony332.tk using port 53

Malware can connect to a remote host to do any of the following:

• Check for an Internet connection
• Download and run files (including updates or other malware)
• Report a new infection to its author
• Receive configuration or other data
• Receive instructions from a malicious hacker
• Search for your PC location
• Upload information taken from your PC
• Validate a digital certificate

Additional information

Creates a mutex

This threat can create a mutex on your PC. For example:

• 99999

It might use this mutex as an infection marker to prevent more than one copy of the threat running on your PC.



This malware description was published using automated analysis of file SHA1 072193a314990a677f93e34211b7b2ea2b54b3ae.

Symptoms

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

• You see the following mutex:
  • 99999

Last update 17 August 2015

 

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