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TROJ_AGENT_0000233.TOMA

October 03, 2012
 ALIASES:

Trojan:Win32/WinSpywareProtect (Microsoft); Downloader-BLO (McAfee); Downloader (Symantec); Packed.Win32.Katusha.a (Kaspersky); FraudTool.Win32.CryptAV (v) (Sunbelt); Trojan.Zygug.Gen.1 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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:

86,027 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

03 Oct 2012

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 creates the following folders:

  • %User Profile%\Application Data\CrucialSoft Ltd
  • %User Profile%\CrucialSoft Ltd\MS AntiSpyware 2009

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
InstallProgram = "{malware path and file name}"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\CrucialSoft Ltd\
Installer

HKEY_CURRENT_USER\SOFTWARE\CrucialSoft Ltd\
MS AntiSpyware 2009

It adds the following registry entries:

HKEY_CURRENT_USER\Software\CrucialSoft Ltd\
Installer
InstallDate = "{random values}"

HKEY_CURRENT_USER\Software\CrucialSoft Ltd\
MS AntiSpyware 2009
lid = "-1"

HKEY_CURRENT_USER\Software\CrucialSoft Ltd\
MS AntiSpyware 2009
pid = "200002"

HKEY_CURRENT_USER\Software\CrucialSoft Ltd\
MS AntiSpyware 2009
psid = "0"

HKEY_CURRENT_USER\Software\CrucialSoft Ltd\
Installer
IsLoaded = "0"

This report is generated via an automated analysis system.

  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 Safe Mode

[ Learn More ]

Step 3

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\CrucialSoft Ltd
    • Installer
  • In HKEY_CURRENT_USER\SOFTWARE\CrucialSoft Ltd
    • MS AntiSpyware 2009

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • InstallProgram = "{malware path and file name}"
  • In HKEY_CURRENT_USER\Software\CrucialSoft Ltd\Installer
    • InstallDate = "{random values}"
  • In HKEY_CURRENT_USER\Software\CrucialSoft Ltd\MS AntiSpyware 2009
    • lid = "-1"
  • In HKEY_CURRENT_USER\Software\CrucialSoft Ltd\MS AntiSpyware 2009
    • pid = "200002"
  • In HKEY_CURRENT_USER\Software\CrucialSoft Ltd\MS AntiSpyware 2009
    • psid = "0"
  • In HKEY_CURRENT_USER\Software\CrucialSoft Ltd\Installer
    • IsLoaded = "0"

Step 5

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.
  • %User Profile%\Application Data\CrucialSoft Ltd
  • %User Profile%\CrucialSoft Ltd\MS AntiSpyware 2009

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_AGENT_0000233.TOMA. 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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