Analysis by: Roland Marco Dela Paz
ALIASES:

Trojan.Win32.Zapchast.ar (Kaspersky), W32.HLLP.Sality (Symantec), W32/Sality.L (Avira), W32/Kookoo-A (Sophos)

 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

Infection Channel: Dropped by other malware

This backdoor may be dropped by other malware.

This is the Trend Micro detection for files that exhibit certain behaviors.

  TECHNICAL DETAILS

File Size: Varies
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 19 Jan 2006
Payload: Compromises system security, Connects to URLs/IPs

Arrival Details

This backdoor may be dropped by the following malware:

  • PE_SALITY.AC

Other Details

This is the Trend Micro detection for:

  • a DLL component used by PE_SALITY family in performing their malicious routines.

NOTES:

These routines are logging keystrokes and searching for an Internet connection by accessing www.microsoft.com on the affected system. If an Internet connection is established, this backdoor connects to the Internet Relay Chat (IRC) server, {BLOCKED}t.msk.wenet.ru. It then listens and executes commands from a remote malicious user. This routine effectively compromises system security.

It may also connect to the following sites to send and receive information:

  • http://www.{BLOCKED}6kuku.com/
  • http://www.{BLOCKED}t11581q.com/

  SOLUTION

Minimum Scan Engine: 9.200
VSAPI OPR PATTERN File: 3.255.00
VSAPI OPR PATTERN Date: 08 Mar 2006

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_SALITY.A

     PE_SALITY.AC

Step 3

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