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TROJ_SWISYN.CH

October 09, 2012
 Analysis by: Kathleen Notario
 ALIASES:

Trojan Horse (Symantec); Trojan:Win32/Provis!rts (Microsoft); Trojan.Win32.Swisyn.mzr (Kaspersky); Generic.dx!iza (Mcafee); Mal/VB-YZ (Sophos)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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.

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

  TECHNICAL DETAILS

File Size:

20,480 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

15 Oct 2010

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.

Download Routine

This Trojan saves the files it downloads using the following names:

  • C:\Arquivos de programas\calc.exe
  • C:\Arquivos de programas\putty.exe

Other Details

This Trojan attempts to access the following websites to download files, which are possibly malicious:

  • http://{BLOCKED}s.cjb.net/dowload/calc.gif
  • http://{BLOCKED}s.cjb.net/dowload/putty.gif

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

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.540.08

FIRST VSAPI PATTERN DATE:

15 Oct 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

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • C:\Arquivos de programas\calc.exe
  • C:\Arquivos de programas\putty.exe

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_SWISYN.CH. 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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