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TROJ_SWIZZOR.SLPS

October 09, 2012
 Analysis by: Sabrina Lei Sioting
 ALIASES:

Trojan:Win32/C2Lop.N (Microsoft), Trojan.Win32.Swizzor.a (Kaspersky), Adware.Lop (Symantec), Swizzor.gen.c (McAfee), Mal/Swizzor-B (Sophos), Trojan.Swizzor.Gen.4 (Fsecure), Trojan.Win32.Swizzor.Gen (Sunbelt), W32/Swizzor.D!Generic (Authentium), Trojan.Swizzor.Gen.4 (Bitdefender), W32/Swizzor.fam!tr (Fortinet), W32/Swizzor.D!Generic (Fprot), Trojan.Win32.Obfuscated (Ikarus), Win32/TrojanDownloader.Swizzor.NBF (Nod32), Trj/Swizzor.S (Panda)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It opens a hidden Internet Explorer window. However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

811,008 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

23 Jun 2012

Payload:

Connects to URLs/IPs, Displays ads

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan adds the following mutexes to ensure that only one of its copies runs at any one time:

  • Global\{random}
  • Local\{random}

It injects threads into the following normal process(es):

  • IEXPLORE.EXE

Adware Routine

This Trojan connects to the following URLs to download and display ads:

  • ads.{BLOCKED}s-local.com

Other Details

This Trojan opens a hidden Internet Explorer window.

However, as of this writing, the said sites are inaccessible.

  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

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