Threat Encyclopedia

RTKT_BLACKEN.C

Publish date: January 28, 2016

ANALYSIS BY

Francis Xavier Antazo


PLATFORM:

Windows

OVERALL RISK RATING:
DAMAGE POTENTIAL:
DISTRIBUTION POTENTIAL:
REPORTED INFECTION:
INFORMATION EXPOSURE:

  • Threat Type:Rootkit

  • Destructiveness:No

  • Encrypted: Yes

  • In the wild: Yes

OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This malware is related to the recent BlackEnergy targeted attacks that affected industries in Ukraine.

To get a one-glance comprehensive view of the behavior of this Rootkit, refer to the Threat Diagram shown below.

This rootkit arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

TECHNICAL DETAILS

File Size:

62,464 bytes

File Compression:

Telock

Memory Resident:

Yes

Initial Samples Received Date:

28 Jul 2015

Payload:

Downloads files, Steals information

Arrival Details

This rootkit arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Download Routine

This rootkit accesses the following websites to download files:

  • https://{BLOCKED}.{BLOCKED}.111.154/Microsoft/Update/KS081274.php
  • https://{BLOCKED}.{BLOCKED}.25.92/fHKfvEhleQ/maincraft/derstatus.php
  • https://{BLOCKED}.{BLOCKED}.32.230/Microsoft/Update/KS1945777.php

It saves the files it downloads using the following names:

  • %System%\ieapflrt.dat
  • %System%\drivers\nlang.dat

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Information Theft

This rootkit gathers the following data:

  • computer name
  • ID
  • build id

SOLUTION

Minimum Scan Engine:

9.800

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Search and delete these files

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
 
  • %System%\ieapflrt.dat
  • %System%\drivers\nlang.dat

Step 3

Scan your computer with your Trend Micro product to delete files detected as RTKT_BLACKEN.C. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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