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Backdoor:Win32/Zegost.DT


First posted on 06 July 2015.
Source: Microsoft

Aliases :

There are no other names known for Backdoor:Win32/Zegost.DT.

Explanation :

Threat behavior

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

  • %SystemRoot%\update.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 do 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:
  • syllllll.f3322.org 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:

  • syllllll.f3322.org 68187


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 ec3a726497e5c6be89a3cac2e0e1640f157bb406.

Symptoms

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

  • You see a file similar to:
    • %SystemRoot%\update.exe
  • You see registry modifications such as:
    • In subkey: HKLM\SYSTEM\CurrentControlSet\Services\.Net CLR
      Sets value: "Description"
      With data: "microsoft .net and windows xp com+ integration with soap"
  • You see the following mutex:
    • syllllll.f3322.org 68187

Last update 06 July 2015

 

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