Analysis by: Sabrina Lei Sioting
 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

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.

  TECHNICAL DETAILS

File Size: 100,352 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 22 Jun 2011

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 drops the following files:

  • %System Root%\3JhGycxJlyuOMbT.tmpx
  • %System Root%\HivizL4.exe
  • %System Root%\N123P\ctfmon.exe
  • %System Root%\N123P\svchost.exe
  • %System Root%\Documents and Settings\All Users\Desktop\Internet. Explorer..lnk
  • %User Profile%\Favorites\114la.ÍøÖ·µ¼º½.url
  • %User Profile%\Favorites\265.ÍøÖ·µ¼º½.url
  • %User Profile%\Favorites\hao123.ÍøÖ·µ¼º½.url
  • %User Profile%\Favorites\ÿÈÕÐÇ×ùÔËÊÆ..lnk
  • %User Profile%\Favorites\ÃÀŮͼƬ..lnk
  • %User Profile%\Favorites\Ãâ·ÑµçÓ°..lnk
  • %User Profile%\Favorites\Ãâ·ÑС˵..lnk
  • %User Profile%\Favorites\ÌÔ±¦¹ºÎï..lnk
  • %User Profile%\Favorites\ÔÚÏßСÓÎÏ·..lnk
  • %System%\CehdMi7\pvdARLw.exe
  • %System%\dydy.ico
  • %System%\pvdARLw\attrib.exe
  • %System%\pvdARLw\cacls.exe
  • %System%\pvdARLw\CehdMi7.exe
  • %System%\ttao.ico
  • %System%\xyxs.ico
  • %System%\xzws.ico

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

It creates the following folders:

  • %System Root%\N123P
  • %System%\CehdMi7
  • %System%\pvdARLw

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

  SOLUTION

Minimum Scan Engine: 9.300

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

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\N123P
  • %System%\CehdMi7
  • %System%\pvdARLw

Step 3

Search and delete this file

[ Learn More ]
There may be some 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.  
  • %System Root%\3JhGycxJlyuOMbT.tmpx
  • %System Root%\HivizL4.exe
  • %System Root%\Documents and Settings\All Users\Desktop\Internet. Explorer..lnk
  • %User Profile%\Favorites\114la.ÍøÖ·µ¼º½.url
  • %User Profile%\Favorites\265.ÍøÖ·µ¼º½.url
  • %User Profile%\Favorites\hao123.ÍøÖ·µ¼º½.url
  • %User Profile%\Favorites\ÿÈÕÐÇ×ùÔËÊÆ..lnk
  • %User Profile%\Favorites\ÃÀŮͼƬ..lnk
  • %User Profile%\Favorites\Ãâ·ÑµçÓ°..lnk
  • %User Profile%\Favorites\Ãâ·ÑС˵..lnk
  • %User Profile%\Favorites\ÌÔ±¦¹ºÎï..lnk
  • %User Profile%\Favorites\ÔÚÏßСÓÎÏ·..lnk
  • %System%\dydy.ico
  • %System%\ttao.ico
  • %System%\xyxs.ico
  • %System%\xzws.ico

Step 4

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