Analysis by: Rhena Inocencio


Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)


  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes


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

This backdoor is a new variant of the malware family CARBERP. It downloads and installs new plug-ins from its remote server thus compromising the security of the infected systems

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

For the related story, you may read the blog post, CARBERP Banking Malware Makes a Comeback.

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

It logs a user's keystrokes to steal information.


File Size: 211,968 bytes
File Type: EXE
File Compression: UPX
Memory Resident: Yes
Initial Samples Received Date: 30 Jan 2013
Payload: Compromises system security, Logs keystrokes, Downloads files, Steals information

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.


This backdoor drops the following copies of itself into the affected system:

  • {All User's Profile}\Start Menu\Programs\Startup\{random file name}.exe

Backdoor Routine

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

  • Download, install and update plug-ins
  • Remote Desktop Connection
  • Capture Screenshots
  • Monitor Browsers by form grabbing
  • Search words in document files
  • Get FTP passwords
  • Send and delete cookies
  • Download and execute arbitrary files
  • Send files to server
  • Reboot

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


Information Theft

This backdoor gathers the following data:

  • MAC Address
  • Gateway
  • IP Mask
  • IP Address
  • Adapter Address
  • Adapter Description
  • AdapterName
  • SecondaryWinsServer
  • PrimaryWinsServer
  • Lease Obtained
  • DHCP Server
  • DHCP Enabled
  • Bot ID
  • Account Name
  • Account Password
  • Account Balance
  • Account Statements

It logs a user's keystrokes to steal information.

This backdoor downloads the following plug-ins from its command-and-control (C&C) server:

  • passw.plug - used to get passwords stored in installed softwares
  • docfind.plug - search keywords in documents
  • vnc.plug - used for remote access
  • vncdll.plug - used for remote access
  • rdp.plug - used for remote desktop connection
  • ifobs.plug - used to monitor IFOBS
  • cyberplat.plug - used to monitor CyberPlat
  • rtlext.plug
  • addtrust.plug

It monitors the following browsers:

  • Internet Explorer
  • Firefox
  • Chrome

It uses the following strings for monitoring:

  • BBSCBank
  • *://
  • **
  • *iFOBS*
  • https://*/ibc
  • **
  • **
  • **
  • **
  • **


Minimum Scan Engine: 9.300
VSAPI OPR PATTERN File: 9.691.00
VSAPI OPR PATTERN Date: 30 Jan 2013

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_CARBERP.MEO

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete the file detected as BKDR_CARBERP.MEO

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 5

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