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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.

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.