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Backdoor:MSIL/Aataki.AC!bit


First posted on 03 January 2017.
Source: Microsoft

Aliases :

There are no other names known for Backdoor:MSIL/Aataki.AC!bit.

Explanation :

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

  • %USERPROFILE%\documents\msdcsc\msdcsc.exe
  • \programs\filename.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: "MicroUpdate"
With data: "%USERPROFILE%\documents\msdcsc\msdcsc.exe"
Sets value: "Update"
With data: "\programs\filename.exe"
In subkey: HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon
Sets value: "UserInit"
With data: "\userinit.exe,%USERPROFILE%\documents\msdcsc\msdcsc.exe"
In subkey: HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "Update"
With data: "\programs\filename.exe"

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

Payload

Allows backdoor access and control

This threat can give a malicious hacker access and control of your PC. They can then perform a number of different actions, such as:
  • Deleting files
  • Downloading and running files
  • Logging your keystrokes or stealing your sensitive data
  • Modifying your system settings
  • Running or stopping applications
  • Spreading malware to other PCs
  • Uploading files


Connects to a remote host

We have seen this threat connect to a remote host, including:
  • cchibinho.ddns.net using port 1604
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:
  • DC_MUTEX-WAUU1FM
  • DCPERSFWBP


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 ade5d7592c7f81fa2b1a76b65cfb771fc92c00f2.

Last update 03 January 2017

 

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