Analysis by: Marfel Tiamzon
 PLATFORM:

Windows 2000, XP, 2003, Vista

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

This backdoor may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 56,832 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 04 Nov 2010

Arrival Details

This backdoor may be dropped by the following malware:

  • TROJ_DROPPER.QVA

Process Termination

This backdoor terminates the following malware-related processes:

  • Avp.exe

Note :

Backdoor Routine

This Backdoor opens the following ports:

  • TCP port 53

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

  • Zgrsl.{BLOCKED}u.com
  • {BLOCKED}.{BLOCKED}.133.123

It executes the following commands from a remote malicious user:

  • Perform shell commands
  • Enumerate drive and files with their respective information
  • Overwrite file with data specified by the attacker
  • Retrieve contents of a file specified by the attacker
  • Execute file
  • Get the following system information:
    • Computer name
    • Username
    • CPU type
    • CPU speed
    • Current process ID
    • OS version
    • Memory size
    • Drive type
    • Disk space

Other Details

This Backdoor does the following:

  • Once a connection to the servers is established, it sends the following requests:
    • GET /s/asp?=p=1
    • POST /s/asp?=p=1
  • It attempts to access the file IDE21201.VXD, a device driver that directly communicates with the harddisk. It uses the said file to gain information about the user’s harddisk.
  • It also retrieves the following information from the affected system:
    • Drive information
    • Computer Name
    • OS information
    • Hostname
    • Mac Address

  SOLUTION

Minimum Scan Engine: 8.900

Step 1

For Windows ME and XP users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware files dropped/downloaded by BKDR_GOLPECO.A

Step 3

Scan your computer with your Trend Micro product and note files detected as BKDR_GOLPECO.A

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

Search and delete the file detected as BKDR_GOLPECO.A

[ 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 6

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