Analysis by: Rhena Inocencio
ALIASES:

TrojanDropper:Win32/Sality.AU (Microsoft), W32/Sality.dr (McAfee), Trojan.Dropper (Symantec)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size: Varies
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 22 Mar 2013
Payload: Drops files

Arrival Details

This Trojan may be dropped by the following malware:

  • PE_SALITY

This malware arrives via the following means:

  • This is executed by a malicious LNK file detected by Trend Micro as EXPL_CPLNK.SM

NOTES:

This Trojan arrives on the system using the following name:

  • {random file name}.tmp

It contains the encyrpted copy of the mother file of PE_SALITY.

It drops the mother file using the following name:

  • %User Temp%\{random filename}.exe - detected as PE_SALITY.ER-O

It executes the dropped file. As a result, malicious routines of the dropped files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 9.818.06
FIRST VSAPI PATTERN DATE: 26 Mar 2013
VSAPI OPR PATTERN File: 9.819.00
VSAPI OPR PATTERN Date: 26 Mar 2013

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Remove the malware/grayware file dropped/downloaded by TROJ_SALITY.SM

Step 3

Scan your computer with your Trend Micro product to clean files detected as TROJ_SALITY.SM. 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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