BKDR_QAKCFG.AD

October 08, 2012
 Analysis by: Sabrina Lei Sioting
 ALIASES:

Backdoor:Win32/Qakbot.gen!arc3 [Microsoft]; Trojan.Win32.Bzud.b [Kaspersky]

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

It is an encrypted configuration file that is used by the WORM_QAKBOT family. Once decrypted, it contains the following:

  • reference to the components and their corresponding random file names in the system
  • P2P node IRC data (port, nick, password)
  • FTP hosts (upload sites)
  • configuration file version
  • infection logs

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

  TECHNICAL DETAILS

File Size:

265,469 bytes

File Type:

Other

Memory Resident:

No

Initial Samples Received Date:

03 Mar 2011

Arrival Details

This backdoor may be downloaded from remote site(s) by the following malware:

  • WORM_QAKBOT family

Other Details

This backdoor does the following:

  • It is an encrypted configuration file that is used by the WORM_QAKBOT family. Once decrypted, it contains the following:
    • reference to the components and their corresponding random file names in the system
    • P2P node IRC data (port, nick, password)
    • FTP hosts (upload sites)
    • configuration file version
    • infection logs

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.870.07

VSAPI PATTERN Date:

03 Mar 2011

VSAPI PATTERN Date:

3/3/2011 12:00:00 AM

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 malware files dropped/downloaded by BKDR_QAKCFG.AD

    WORM_QAKBOT family

Step 3

Scan your computer with your Trend Micro product to delete files detected as BKDR_QAKCFG.AD. 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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