Modified by: Nikko Tamana
ALIASES:

PWS:MSIL/Grozlex.A (Microsoft)

 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:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This spyware 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: 140,800 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 05 Nov 2013

Arrival Details

This spyware 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 spyware creates the following folders:

  • %Application Data\Microsoft\Crypto
  • %Application Data\Microsoft\Crypto\RSA
  • %Application Data\Microsoft\Crypto\RSA\{SID}

Other Details

This spyware connects to the following possibly malicious URL:

  • http://www.{BLOCKED}7.comli.com/B/Z/?action=add&a=12&c={OS Version}&u=www.no-ip.com&l=&p=
  • http://www.{BLOCKED}7.comli.com/B/Z/?action=add&a=4&c={OS Version}&u=-&l={OS Version Name}&p={Serial ID}
  • http://www.{BLOCKED}7.comli.com/B/Z/?action=add&a=11&c={OS Version}&u=messenger.yahoo.com&l={Yahoo Messenger Username}&p={Password Hash}

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 10.392.01
FIRST VSAPI PATTERN DATE: 05 Nov 2013
VSAPI OPR PATTERN File: 10.393.00
VSAPI OPR PATTERN Date: 06 Nov 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

Restart in Safe Mode

[ Learn More ]

Step 3

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.
  • %Application Data\Microsoft\Crypto

Step 4

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