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TrojanSpy:MSIL/Kostioul.A


First posted on 30 December 2016.
Source: Microsoft

Aliases :

There are no other names known for TrojanSpy:MSIL/Kostioul.A.

Explanation :

Installation
This threat can create files on your PC, including:

  • %APPDATA%\rsbot-7036.exe
  • %ProgramFiles%\windowslive\windowsupadate.exe
  • %TEMP%\rarsfx0\axehdojkiicchmbulm.dat
  • %TEMP%\rarsfx0\yuyhrd.exe


It modifies the registry so that it runs each time you start your PC. For example:

In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "windowslive"
With data: %ProgramFiles%\windowslive\windowsupadate.exe" -a /a"

The malware uses code injection to make it harder to detect and remove. It can inject code into running processes.

Payload

Collects your sensitive information

This threat can collect your sensitive information without your consent. This can include:
  • The keys you press
  • The applications you open
  • Your web browsing history
  • Your credit card information
  • Your user names and passwords


It can also imitate a legitimate website to lure you into revealing your sensitive information.

Connects to a remote host

We have seen this threat connect to a remote host, including:
  • aashadhar.sytes.net 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 one or more mutexes on your PC. For example:
  • f4cb870e13b5babe03c6661a040c6dd4bab52497
  • eed3bd3a-a1ad-4e99-987b-d7cb3fcfa7f0 - S-1-5-21-3383749062-2246846829-375697490-500


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 136c3ecc0edd65634e5a9a7e9923ffb261d3c5e4.

Last update 30 December 2016

 

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