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RANSOM_FSOCIETY.C

February 15, 2017
 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:

Dropped by other malware, 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.

  TECHNICAL DETAILS

File Size:

278,307 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

25 Nov 2016

Payload:

Drops files, 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.

Autostart Technique

This Trojan drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

  • %User Startup%\1.exe
  • %User Startup%\2.exe
  • %User Startup%\3.exe
  • %User Startup%\4.exe
  • %User Startup%\5.exe
  • %User Startup%\6.exe
  • %User Startup%\7.exe
  • %User Startup%\8.exe
  • %User Startup%\9.exe
  • %User Startup%\10.exe
  • %User Startup%\11.exe
  • %User Startup%\12.exe
  • %User Startup%\13.exe
  • %User Startup%\14.exe
  • %User Startup%\15.exe
  • %User Startup%\16.exe
  • %User Startup%\17.exe
  • %User Startup%\18.exe
  • %User Startup%\19.exe
  • %User Startup%\20.exe
  • %User Startup%\Chrome.exe
  • %User Startup%\Explorer.exe
  • %User Startup%\FSOCIETY.exe
  • %User Startup%\INFECTED.exe
  • %User Startup%\Padlock.exe
  • %User Startup%\TaskMngr.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

Other Details

This Trojan does the following:

  • It executes the following commands to shutdown the system:
    • shutdown -s

NOTES:

The ransomware displays the following lockscreen:

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.132.05

FIRST VSAPI PATTERN DATE:

02 Jan 2017

VSAPI OPR PATTERN File:

13.133.00

VSAPI OPR PATTERN Date:

03 Jan 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

Search and delete the files detected as RANSOM_FSOCIETY.C

*Note: Some component files may be 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.

To stop the malware/grayware from running when certain files are opened:

For Windows 2000, Windows XP, and Windows Server 2003:

  1. Right-click Start then click Search....
  2. In the File name* input box, type the name of the file that was detected earlier.
  3. In the Look In drop-down list, select My Computer then press Enter.
  4. Once located, select the file then press SHIFT+DELETE to delete it.
    *Note: The file name input box title varies depending on the Windows version (e.g. Search for files or folders named or All or part of the file name.).

For Windows Vista, Windows 7, Windows Server 2008, Windows 8, Windows 8.1, and Windows Server 2012 (R2):

  1. Open a Windows Explorer window.
    • For Windows Vista, 7, and Server 2008 users, click Start>Computer.
    • For Windows 8, 8.1, and Server 2012 users, right-click on the lower left corner of the screen,then click File Explorer.
  2. In the Search Computer/This PC input box, type the name of the file that was detected earlier.
  3. Once located, select the file then press SHIFT+DELETE to delete it.
    *Note: Read the following Microsoft page if these steps do not work on Windows 7.

Step 4

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


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