PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

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

This backdoor arrives as a file that exports the functions of other malware/grayware. It arrives as a component bundled with malware/grayware packages.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size: 43,520 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 22 Sep 2014
Payload: Connects to URLs/IPs

Arrival Details

This backdoor arrives as a file that exports the functions of other malware/grayware.

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

Installation

This backdoor drops the following component file(s):

  • %User Temp%\00EV1522360.tmp - log file which contains the following information:
    • {date} {time} - {status} {value}
      where {status} can be any of the following:
      • start
      • delay
      • proxy
      • suspend
      • open URL
      • install
      • unknown

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Backdoor Routine

This backdoor connects to the following websites to send and receive information:

  • http://{BLOCKED}.{BLOCKED}.108.54:80/{random}/page_{value generated by time}.html

As of this writing, the said sites are inaccessible.

NOTES:

This backdoor queries the values of the following registry entries:

HKEY_USERS\{SID}\Software\Microsoft\Windows\
CurrentVersion\Internet Settings
ProxyServer
ProxyEnable

  SOLUTION

Minimum Scan Engine: 9.700

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

Scan your computer with your Trend Micro product and note files detected as BKDR_EROVA.LJ

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete the file detected as BKDR_EROVA.LJ

[ Learn More ]

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_EROVA.LJ. 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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