PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

BEDEP, also known as ROZENA, increased presence in the first few weeks of 2015. It arrives via websites containing an Adobe Flash exploit. Users are redirected to these websites by malvertisements.

This family of backdoors and Trojans attempt to communicate to various AdFraud servers to access different advertisements in a hidden desktop. BEDEP contains heavy encryption and disguises itself as a Microsoft file through file properties and use of seemingly legitimate export functions.

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It arrives as a component bundled with malware/grayware packages.

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size: Varies
Memory Resident: Yes
Payload: Connects to URLs/IPs, Downloads files

Arrival Details

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

It arrives as a component bundled with malware/grayware packages.

Installation

This backdoor injects codes into the following process(es):

  • explorer.exe
  • iexplore.exe

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Download and execute arbitrary files
  • Update itself

It connects to the following websites to send and receive information:

  • {BLOCKED}hgfrhicr.com

It posts the following information to its command and control (C&C) server:

  • Bot ID
  • Build ID
  • Operating system version
  • Processor (32- or 64-bit)

Download Routine

This backdoor accesses the following websites to download files:

  • http://{BLOCKED}askolfa.com/ads.php?sid={build id}

Other Details

This backdoor requires its main component to successfully perform its intended routine.

  SOLUTION

Minimum Scan Engine: 9.750

NOTES:

Trend customers:

    Keep your pattern and scan engine files updated. Trend Micro antivirus software can clean or remove most types of computer threats. Malware, though, such as Trojans, scripts, overwriting viruses and joke programs which are identified as uncleanable, should simply be deleted.

All Internet users:

  • Use HouseCall - the Trend Micro online threat scanner to check for malware that may already be on your PC.
  • Catch malware/grayware before they affect your PC or network. Secure your Web world with Trend Micro products that offer the best anti-threat and content security solutions for home users, corporate users, and ISPs. Go here for more information on Trend Micro products that fit your needs.


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