RANSOM_LAZAGNECRYPT.THAOKAH
Trojan.Lazagcrypt (QUICKHEAL); Ransom:MSIL/Lazagcrypt (MICROSOFT)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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.
As of this writing, the said sites are inaccessible.
It connects to certain websites to send and receive information. However, as of this writing, the said sites are inaccessible.
It encrypts files with specific file extensions.
TECHNICAL DETAILS
525,824 bytes
EXE
No
06 Jan 2018
Connects to URLs/IPs, Downloads files, Encrypts files, Collects system information
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.
Installation
This Ransomware drops the following files:
- %Application Data%/Microsoft/{hash of Computer info and hostname}-pw.inf -> Retrieved passwords stored in the local computer
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.)
Download Routine
This Ransomware accesses the following websites to download files:
- https://disk.{BLOCKED}isk.com/tifu17/file.exe
It saves the files it downloads using the following names:
- %Application Data%\Microsoft\laz.exe
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.)
As of this writing, the said sites are inaccessible.
Information Theft
This Ransomware gathers the following data:
- Hash of Computer information and Hostname
- Computer name
- %Application Data% -> Directory
- %User Profile% ->Directory
- Generated Encrypted Private Key
- BTC Address (given from array)
- Generated Unique Key
- Amount of Euro to be Paid
- Payment
- Date Affected
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.. %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 and 7.)
Other Details
This Ransomware connects to the following website to send and receive information:
- https://disk.{BLOCKED}isk.com/tifu17
However, as of this writing, the said sites are inaccessible.
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- .bmp
- .jpg
- .jpeg
- .tiff
- .tif
- .gif
- .doc
- .docx
- .ppt
- .pptx
- .xls
- .xlsx
- .png
- .odt
- .ods
It avoids encrypting files found in the following folders:
- %User Profile%\
(Note: %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 and 7.)
It appends the following extension to the file name of the encrypted files:
- .encr
SOLUTION
9.850
13.898.04
11 Jan 2018
13.899.00
12 Jan 2018
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_LAZAGNECRYPT.THAOKAH
- 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
- %Application Data%/Microsoft/{hash of Computer info and hostname}-pw.inf
- %Application Data%\Microsoft\laz.exe
Step 5
Scan your computer with your Trend Micro product to delete files detected as RANSOM_LAZAGNECRYPT.THAOKAH. 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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