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TROJ_CRYPCTB.P

February 11, 2015
 Analysis by: Rika Joi Gregorio
 ALIASES:

Ransom:Win32/Critroni.A(Microsoft), Trojan.Cryptolocker.E(Norton), Win32/Filecoder.DA trojan(Eset)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


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 may be dropped by other malware.

It uses Windows Task Scheduler to create a scheduled task that executes the dropped copy.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

765,440 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

06 Feb 2015

Payload:

Connects to URLs/IPs, Encrypts files, Displays graphics/image, Displays message/message boxes

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.

It may be dropped by the following malware:

Step 3

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 4

Restart in Safe Mode

[ Learn More ]

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. ?
  • %All Users Profile%\Application Data\{random characters}.html
  • %All Users Profile%\Application Data\{randomly selected folder }\{random file name}
  • %User Profile%\My Documents\!Decrypt-All_Files-{random letters}.bmp
  • %User Profile%\My Documents\!Decrypt-All_Files-{random letters}.txt
  • %System%\config\systemprofile\My Documents\!Decrypt-All_Files-{random letters}.bmp
  • %System%\config\systemprofile\My Documents\!Decrypt-All_Files-{random letters}.txt
  • %Windows%\Tasks\{random file name}.job

Step 6

Reset your Desktop properties

[ Learn More ]

Step 7

Restart in normal mode and scan your computer with your live casino online product for files detected as TROJ_CRYPCTB.P. If the detected files have already been cleaned, deleted, or quarantined by your live casino online product, no further step is required. You may opt to simply delete the quarantined files. Please check this for more information.

NOTES:

Restore the encrypted files by this malware from backup. Note that the encrypted files have the extension .{7 random letters}.