RANSOM_ENCODER.R002C0OK418
Trojan-Ransom.Win32.Encoder.alm (Kaspersky), Win32/Packed.Autoit.H Suspicious (ESET-NOD32), Trojan.Injector.AutoIt (Malwarebytes)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Ransomware may be dropped by other malware.
It encrypts files found in specific folders.
TECHNICAL DETAILS
Arrival Details
This Ransomware may be dropped by the following malware:
Autostart Technique
This Ransomware drops the following files:
- %User Temp%\wl.jpg ← used as desktop wallpaper
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)
Other System Modifications
This Ransomware sets the system's desktop wallpaper to the following image:
Ransomware Routine
This Ransomware encrypts files found in the following folders:
- %Desktop%
- %Public%\Documents
- %Public%\Videos
- %Public%\Pictures
- %User Profile%\
- %User Profile%\Videos
- %User Profile%\Pictures
- %User Profile%\Music
- %User Profile%\Documents
- %AppDataLocal%
- {All Fixed Drives} ← except System Drives
(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista, 7, and 8.. %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista, 7, and 8.. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local on Windows Vista, 7, and 8.)
It avoids encrypting files with the following strings in their file name:
- Lock.
- Fixed.
It renames encrypted files using the following names:
- Lock.{encrypted file}
SOLUTION
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
Identify and terminate files detected as RANSOM_ENCODER.R002C0OK418
- 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.
- 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.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 4
Search and delete these files
- %User Temp%\wl.jpg
Step 5
Scan your computer with your Trend Micro product to delete files detected as RANSOM_ENCODER.R002C0OK418. 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 the following Trend Micro Support pages for more information:
Step 6
Restore encrypted files from backup.
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