ALIASES:

Ransom:Win32/Critroni.B (Microsoft); RDN/Ransom!ex (McAfee); Trojan.Gen (Symantec); Trojan-Ransom.Win32.Onion.dx (Kaspersky); Troj/Agent-AMZI (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Generic_vb.ILU (AVG)

 PLATFORM:

Windows

 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: 205,006 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 02 Jun 2015

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 adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Health\{46C60B80-0100-45D5-ACF6-FEB96BF5B2FE}

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Preferences\ProxySettings

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows Media\WMSDK\General
UniqueID = "{E4AFE102-C6F7-4AF5-B72D-67088B9CCD1E}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows Media\WMSDK\General
ComputerName = "CWS09D101"

HKEY_CURRENT_USER\Software\Microsoft\
Windows Media\WMSDK\General
VolumeSerialNumber = "68adfd"

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.750

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

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\Microsoft\MediaPlayer\Health
    • {46C60B80-0100-45D5-ACF6-FEB96BF5B2FE}
  • In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Preferences
    • ProxySettings

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\Microsoft\Windows Media\WMSDK\General
    • UniqueID = "{E4AFE102-C6F7-4AF5-B72D-67088B9CCD1E}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows Media\WMSDK\General
    • ComputerName = "CWS09D101"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows Media\WMSDK\General
    • VolumeSerialNumber = "68adfd"

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_CRYPCTB.CC. 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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