Analysis by: Roland Marco Dela Paz
ALIASES:

TrojanDownloader:Win32/Harnig.S (Microsoft); Packed.Win32.Krap.ao (Kaspersky)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

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

It uses common file icons to trick a user into thinking that the files are legitimate.

It connects to a website to send and receive information.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size: 23,552 bytes
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 21 Dec 2010

Arrival Details

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

  • WORM_AUTORUN.GKD

It may be downloaded from the following remote sites:

  • http://www.{BLOCKED}btown.com/dohk/dope.exe

Installation

This Trojan uses common file icons to trick a user into thinking that the files are legitimate.

It stays memory-resident by injecting codes into the following processes:

  • svchost.exe

Backdoor Routine

This Trojan connects to the following websites to send and receive information:

  • http://{BLOCKED}.{BLOCKED}.252.245

As of this writing, the said sites are inaccessible.

Other Details

This Trojan deletes itself after execution.

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI OPR PATTERN File: 7.715.00
VSAPI OPR PATTERN Date: 21 Dec 2010

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 TROJ_DLOAD.ZQKA

Step 3

Scan your computer with your Trend Micro product and note files detected as TROJ_DLOAD.ZQKA

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

Search and delete the file detected as TROJ_DLOAD.ZQKA

[ 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.


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