Ransom.MSIL.KEYGROUPTG.THLOFBC
Windows
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Threat Type: Ransomware
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It drops copies of itself into network drives. It drops copies of itself in all removable drives.
It drops files as ransom note.
TECHNICAL DETAILS
Arrival Details
This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Propagation
This Ransomware drops copies of itself into network drives.
It drops copies of itself in all removable drives.
Other Details
This Ransomware does the following:
- Deletes file with the following extension:
- .bak
- It encrypts removable and network drives, as well as the %User Profile% directory.
- It drops a copy of itself to removable and network drives with the following name:
- pifa.pdf.exe
- It does not append an extension to encrypted files.
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)
Ransomware Routine
This Ransomware drops the following file(s) as ransom note:
- {Encrypted Directory}\keygroup777tg.txt
SOLUTION
Step 1
Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:
- TROJ.Win32.TRX.XXPE50FFF075
Step 2
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
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
Search and delete these files
- {Network/Removable Drive}\pifa.pdf.exe
Step 5
Scan your computer with your Trend Micro product to delete files detected as Ransom.MSIL.KEYGROUPTG.THLOFBC. 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:
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