RANSOM_PYLEET.A
Ransom.Pyleet.Gen!c(AegisLab)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
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 connects to certain websites to send and receive information.
TECHNICAL DETAILS
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.
Installation
This Trojan drops the following files:
- %User Temp%\_MEI{random numbers}\_ctypes.pyd
- %User Temp%\_MEI{random numbers}\_hashlib.pyd
- %User Temp%\_MEI{random numbers}\_socket.pyd
- %User Temp%\_MEI{random numbers}\_ssl.pyd
- %User Temp%\_MEI{random numbers}\bz2.pyd
- %User Temp%\_MEI{random numbers}\Crypto.Cipher._AES.pyd
- %User Temp%\_MEI{random numbers}\Crypto.Cipher._DES.pyd
- %User Temp%\_MEI{random numbers}\Crypto.Cipher._DES3.pyd
- %User Temp%\_MEI{random numbers}\Crypto.Hash._SHA256.pyd
- %User Temp%\_MEI{random numbers}\Crypto.Random.OSRNG.winrandom.pyd
- %User Temp%\_MEI{random numbers}\Crypto.Util._counter.pyd
- %User Temp%\_MEI{random numbers}\Crypto.Util.strxor.pyd
- %User Temp%\_MEI{random numbers}\Microsoft.VC90.CRT.manifest
- %User Temp%\_MEI{random numbers}\msvcm90.dll
- %User Temp%\_MEI{random numbers}\msvcp90.dll
- %User Temp%\_MEI{random numbers}\msvcr90.dll
- %User Temp%\_MEI{random numbers}\python27.dll
- %User Temp%\_MEI{random numbers}\Ransomware.exe.manifest
- %User Temp%\_MEI{random numbers}\select.pyd
- %User Temp%\_MEI{random numbers}\unicodedata.pyd
Notes:The dropped files above were used by the malware to ensure that it will execute properly.
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It creates the following folders:
- %User Temp%\_MEI{random numbers}
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
Other Details
This Trojan connects to the following URL(s) to get the affected system's IP address:
- http://ip.42.pl/raws
It connects to the following website to send and receive information:
- http://{BLOCKED}.{BLOCKED}.166.7:1337
It encrypts files with the following extensions:
- .7z
- .css
- .dba
- .docm
- .doc
- .docx
- .html
- .JPEG
- .jpg
- .kbdx
- .mov
- .mp3
- .mp4
- .odb
- .odc
- .oma
- .php
- .ppt
- .pptx
- .pub
- .raw
- .sql
- .txt
- .wallet
- .xlxs
It renames encrypted files using the following names:
- {original filename and extension}.d4nk
It does the following:
- The ransom note contains the following strings:
- You Have Been Infected With Ransomware. Please Make Note of Your Unique Identifier
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
Restart in Safe Mode
Step 4
Search and delete these folders
- %User Temp%\_MEI{random numbers}
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_PYLEET.A. 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 6
Restore encrypted files from backup.
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