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Backdoor:Win32/Unskal.C


First posted on 02 April 2015.
Source: Microsoft

Aliases :

There are no other names known for Backdoor:Win32/Unskal.C.

Explanation :

Threat behavior

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

  • %USERPROFILE%\hqiecbnt.exe
  • \hqiecbnt.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: "hqiecbnt"
With data: "%USERPROFILE%\hqiecbnt.exe"

In subkey: HKLM\software\microsoft\windows\currentversion\run

Sets value: "hqiecbnt"
With data: "\hqiecbnt.exe"



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, including credit card information
  • Modifying your system settings
  • Running or stopping applications
  • Uploading files


Connects to a remote host

We have seen this threat connect to a remote host, including:
  • repherfeted.com using port 80
  • hepretfortna.ru
  • sivesuhat.ru
Malware can connect to a remote host to do any of the following:
  • Check for an Internet connection
  • Report a new infection to its author
  • Receive configuration or other data
  • Search for your PC location
  • Upload information taken from your PC


Additional information

Creates a mutex

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

  • WIN_00BDF72AECAE0CCA


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 66cee049e0d31490b43d5b7387fa81e666d5af7e.

Symptoms

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

  • You see a file similar to:
    • %USERPROFILE%\hqiecbnt.exe
    • \hqiecbnt.exe
  • You see registry modifications such as:
    • In subkey: HKCU\software\microsoft\windows\currentversion\run
      Sets value: "hqiecbnt"
      With data: "%USERPROFILE%\hqiecbnt.exe"

    • In subkey: HKLM\software\microsoft\windows\currentversion\run
      Sets value: "hqiecbnt"
      With data: "\hqiecbnt.exe"

  • The presence of a mutex such as:
    • WIN_00BDF72AECAE0CCA

Last update 02 April 2015

 

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