Threat Encyclopedia

RANSOM_WCRY.C

Publish date: April 14, 2017

ANALYSIS BY

Jennifer Gumban


PLATFORM:

Windows

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

  • Threat Type:Ransomware

  • Destructiveness:No

  • Encrypted: Yes

  • In the wild: Yes

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.340.03

FIRST VSAPI PATTERN DATE:

14 Apr 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

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_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    • Microsoft Task Scheduler = "{location of malware}\{malware filename}.exe" /r 0

Step 5

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_LOCAL_MACHINE\SOFTWARE
    • WannaCryptor = ""
  • In HKEY_CURRENT_USER\SOFTWARE
    • WannaCryptor = ""

Step 6

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.
  • {location of malware}\TaskHost

Step 7

Search and delete these files

[ 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.
  • {location of malware}\00000000.pky
  • {location of malware}\00000000.eky
  • {location of malware}\00000000.res
  • {location of malware}\!Please Read Me!.txt
  • {location of malware}\{random numbers}.bat
  • {location of malware}\!WannaDecryptor!.exe.lnk
  • {location of malware}\TaskHost\Tor\taskhosts.exe
  • {location of malware}\t.wry
  • {location of malware}\c.wry
  • {location of malware}\r.wry
  • {location of malware}\m.wry
  • {location of malware}\f.wry
  • {location of malware}\b.wry
  • {location of malware}\!WannaDecryptor!.bmp

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_WCRY.C. 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 9

Reset your Desktop properties

[ Learn More ]

Step 10

Restore encrypted files from backup.


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