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RANSOM_CRYPDAMG.A

March 10, 2017
 ALIASES:

Ransom.Damage(Malwarebytes)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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:

1,072,128 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

28 Feb 2017

Payload:

Displays graphics/image

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:

  • %Start Menu%\Programs\Startup\-.lnk - shortcut to %System%\shutdown.exe -l -f
  • {location of malware}\out.csv

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • 8YlAhscwHC

Process Termination

This Trojan terminates the following processes if found running in the affected system's memory:

  • cmd.exe

Other Details

This Trojan does the following:

  • It executes the following commands:
    • "%System%\taskkill.exe" /f /im "cmd.exe"
    • "%System%\cmd.exe" /k echo ;Hello >> {location of malware}\out.csv
  • This ransomware deletes all shadow copies by executing the following command:
    • "%System%vssadmin.exe" Delete Shadows /All /Quiet

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

NOTES:
It displays the following:

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.248.05

FIRST VSAPI PATTERN DATE:

28 Feb 2017

VSAPI OPR PATTERN File:

13.249.00

VSAPI OPR PATTERN Date:

01 Mar 2017

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

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.  
  • %Start Menu%\Programs\Startup\-.lnk
  • {location of malware}\out.csv

Step 5

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