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RANSOM_CRYPMIC.H

August 02, 2016
 Analysis by: Marvelous Pelin
 ALIASES:

Ransom:Win32/Exxroute(Microsoft)

 PLATFORM:

Windows

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

  • 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.

It is capable of encrypting files in the affected system.

  TECHNICAL DETAILS

File Size:

620,032 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

22 Jul 2016

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:

  • {folders containing encrypted files}\@README.HTML
  • %Start Menu%\Programs\Startup\ED95D8267FEC.lnk
  • %Start Menu%\Programs\@README.BMP
  • %Start Menu%\Programs\@README.HTML
  • %Application Data%\Microsoft\Windows\Network Shortcuts\@README.HTML
  • %Application Data%\Microsoft\Windows\Network Shortcuts\@README.BMP
  • %Desktop%\@README.BMP
  • %Desktop%\@README.HTML

(Note: %Start Menu% is the Start Menu folder, where it usually is C:\Documents and Settings\{user name}\Start Menu on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
random name = {Hex Values}

Other Details

This Trojan renames encrypted files using the following names:

  • {random file name}.{random file extension}

It is capable of encrypting files in the affected system.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.674.04

FIRST VSAPI PATTERN DATE:

25 Jul 2016

VSAPI OPR PATTERN File:

12.675.00

VSAPI OPR PATTERN Date:

26 Jul 2016

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

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
    • random name = {Hex Values}

Step 5

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.
  • {folders containing encrypted files}\@README.HTML
  • %Start Menu%\Programs\Startup\ED95D8267FEC.lnk
  • %Start Menu%\Programs\@README.BMP
  • %Start Menu%\Programs\@README.HTML
  • %Application Data%\Microsoft\Windows\Network Shortcuts\@README.BMP
  • %Application Data%\Microsoft\Windows\Network Shortcuts\@README.HTML
  • %Desktop%\@README.BMP
  • %Desktop%\@README.HTML

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_CRYPMIC.H. 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 7

Restore encrypted files from backup.


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