Analysis by: Jasen Sumalapao
ALIASES:

a variant of Win32/Agent.OYA trojan (NOD32), Suspicious file (Panda)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor may be downloaded by other malware/grayware/spyware from remote sites. It may be dropped by other malware.

It gathers certain information on the affected computer.

  TECHNICAL DETAILS

File Size: 45,056 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 14 Aug 2012

Arrival Details

This backdoor may be downloaded by other malware/grayware/spyware from remote sites.

It may be dropped by the following malware:

  • TROJ_ARTIEF.JI

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
alg = {Malware Path and Filename}

Backdoor Routine

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

  • andyothers.{BLOCKED}y.com

Information Theft

This backdoor gathers the following information on the affected computer:

  • files and running processes of the system
  • informations on drives and disk spaces

  SOLUTION

Minimum Scan Engine: 9.200

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove the malware/grayware file that dropped/downloaded BKDR_MECTOY.A

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete the registry entry with an unknown data value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • alg = "{Malware Path and Filename}"

Step 5

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