BKDR_PROXY.BEIR


 ALIASES:

Trojan-Downloader.Win32.Agent (Sunbelt), Win32/Agent.PKG trojan (NOD32)

 PLATFORM:

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

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware

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 does not have any propagation routine.

It executes commands from a remote malicious user, effectively compromising the affected system.

As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

10,746,880 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

18 Jan 2013

Payload:

Compromises system security, Connects to URLs/IPs, Collects system information, 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.

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

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

  • Execute files
  • Perform remote shell
  • Sleep for a specified amount of time
  • Download files
  • Delete self

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • http://{BLOCKED}d.{BLOCKED}c.or.kr/UploadFile/fame/x/o0.asp?id=flag:java%20host:{Host Name}%20IP:{IP Address}%20OS:{OS Version}%20vm:{special character}%20proxy:{special character}

Download Routine

This backdoor accesses the following websites to download files:

  • http://{BLOCKED}.{BLOCKED}u.com/a.asp?id={random value}{Day, Date, Time and Year of Download}
  • http://{BLOCKED}.{BLOCKED}u.com/b.asp?id={random value}{Day, Date, Time and Year of Download}
  • http://{BLOCKED}java.{BLOCKED}4.com/a.asp?id={random value}{Day, Date, Time and Year of Download}
  • http://{BLOCKED}ava.{BLOCKED}4.com/b.asp?id={random value}{Day, Date, Time and Year of Download}

It saves the files it downloads using the following names:

  • %User Temp%\temp.ini

(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.)

As of this writing, the said sites are inaccessible.

Information Theft

This backdoor gathers the following data:

  • Proxy Server IP and Port
  • Host Name
  • Local IP Address
  • OS Version

NOTES:

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.674.06

FIRST VSAPI PATTERN DATE:

23 Jan 2013

VSAPI OPR PATTERN File:

9.675.00

VSAPI OPR PATTERN Date:

23 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

Restart in Safe Mode

[ Learn More ]

Step 3

Search and delete this file

[ 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.
  • %User Temp%\temp.ini

Step 4

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