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Threat Encyclopedia

TROJ_RANSOM.SMAR

ANALYSIS BY

Mark Joseph Manahan


ALIASES:

Troj/Ransom-EY (Sophos) ,Trojan horse Generic27.EAC (AVG) ,W32/Xorist.ER!tr (Fortinet) ,W32/Heuristic-119!Eldorado (not disinfectable) (Fprot) ,Trojan-Ransom.Win32.Xorist (Ikarus) ,Trojan-Ransom.Win32.Xorist.er (Kaspersky) ,Trojan:Win32/Ransom.FO (Microsoft) ,Ransom-FASY!DDA2EA2986B7 (McAfee) ,a variant of Win32/Filecoder.Q trojan (Eset) ,Generic (Panda) ,Trojan.Win32.Ransom.fo (v) (Sunbelt)

PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type:Trojan

  • Destructiveness:No

  • Encrypted: No

  • In the wild: Yes

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Minimum Scan Engine:

9.700

VSAPI OPR PATTERN File:

10.663.00

VSAPI OPR PATTERN Date:

13 Mar 2014

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

Identify and terminate files detected as TROJ_RANSOM.SMAR

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

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_CLASSES_ROOT
    • {random key}
  • In HKEY_LOCAL_MACHINE\Software\Classes
    • {random key}

Step 4

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.


 
  • In HKEY_CLASSES_ROOT\.bat
    • From: {Default} = "batfile"
      To: {Default} = "{random key}"

Step 5

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
    • Alcmeter = "%User Temp%\{random}.exe"

Step 6

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.
  • %Desktop%\HOW TO DECRYPT FILES.txt

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_RANSOM.SMAR 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 8

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • {file name}.{file extension}.bat


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