RANSOM_ITBOOK.THIAHAH
W32/Crypren.AK!tr (Fortinet); Ransom:Win32/Genasom (Microsoft); Ransom.Ufukt (Malwarebytes)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
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.
However, as of this writing, the said sites are inaccessible. It is capable of encrypting files in the affected system.
It encrypts files with specific file extensions. It drops files as ransom note.
TECHNICAL DETAILS
970,240 bytes
EXE
No
18 Sep 2018
Connects to URLs/IPs, Displays message/message boxes, Encrypts files
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 adds the following mutexes to ensure that only one of its copies runs at any one time:
- IT.Books
Other System Modifications
This Ransomware adds the following registry keys:
HKEY_CURRENT_USER\Software\Developed by Gehan Fernando.\
IT.Books
1.0.0.0 = ""
It sets the system's desktop wallpaper to the following image:
Other Details
This Ransomware does the following:
- It avoids encrypting files with specific strings in folder path:
- Windows
- AppData
- Boot
- It avoids encrypting files with specific strings in file name:
- READ__IT
- Displays a message after encrypting files:
- saw.jpg
- saw.jpg
- Accessed the following URLs:
- http://{BLOCKED}cs.com/polo/chat.php
- http://{BLOCKED}cs.com/polo/getter.php
However, as of this writing, the said sites are inaccessible.
It is capable of encrypting files in the affected system.
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- .asp
- .aspx
- .csv
- .dll
- .doc
- .docx
- .exe
- .htm
- .html
- .ini
- .jpg
- .mdb
- .msi
- .odt
- .php
- .png
- .ppt
- .pptx
- .psd
- .rar
- .sln
- .sql
- .txt
- .xls
- .xlsx
- .xml
- .zip
It appends the following extension to the file name of the encrypted files:
- .fucked
It drops the following file(s) as ransom note:
- %Desktop%\READ__IT.txt
SOLUTION
9.850
14.512.03
18 Sep 2018
14.513.00
19 Sep 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_ITBOOK.THIAHAH
- 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
Delete this registry key
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_CURRENT_USER\Software\Developed by Gehan Fernando.\IT.Books
- 1.0.0.0
- 1.0.0.0
Step 5
Search and delete files detected as RANSOM_ITBOOK.THIAHAH
- %Desktop%\READ__IT.txt
Step 6
Scan your computer with your Trend Micro product to delete files detected as RANSOM_ITBOOK.THIAHAH. 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 7
Restore encrypted files from backup.
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