ALIASES:

Trojan.Win32.Generic!BT, Trojan.Win32.Packer.EnigmaProtector1.1X-1.3X (ep) (Sunbelt)

 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: 3,325,785 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 20 Sep 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.

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\nsy2.tmp

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\Enigma Protector\
5BCC3529A7559E72-8EE2C8A0CC1086C4

HKEY_CURRENT_USER\Software\Enigma Protector\
5BCC3529A7559E72-8EE2C8A0CC1086C4\8CCA47808F48BBCF-EFF203511F1126A7

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Enigma Protector\
5BCC3529A7559E72-8EE2C8A0CC1086C4\8CCA47808F48BBCF-EFF203511F1126A7
52D7B86C = "{random values}"

HKEY_CURRENT_USER\Software\Enigma Protector\
5BCC3529A7559E72-8EE2C8A0CC1086C4
Options = "{random values}"

Dropping Routine

This Trojan drops the following files:

  • \7z.exe
  • \Ä«½ºÅø.exe

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

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\Enigma Protector
    • 5BCC3529A7559E72-8EE2C8A0CC1086C4
  • In HKEY_CURRENT_USER\Software\Enigma Protector\5BCC3529A7559E72-8EE2C8A0CC1086C4
    • 8CCA47808F48BBCF-EFF203511F1126A7

Step 3

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\Enigma Protector\5BCC3529A7559E72-8EE2C8A0CC1086C4\8CCA47808F48BBCF-EFF203511F1126A7
    • 52D7B86C = "{random values}"
  • In HKEY_CURRENT_USER\Software\Enigma Protector\5BCC3529A7559E72-8EE2C8A0CC1086C4
    • Options = "{random values}"

Step 4

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.
  • \7z.exe
  • \Ä«½ºÅø.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_CLICKER.PAT. 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.

Step 6

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Temp%\nsy2.tmp


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