Ransom.MSIL.CYMRANSOM.A
Gen:Variant.Ransom.LockerGoga.25 (BITDEFENDER); RDN/Generic.dx (NAI); W32/Filecoder.P!tr (FORTINET)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Ransomware
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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 encrypts files with specific file extensions. It encrypts files found in specific folders.
TECHNICAL DETAILS
27,648 bytes
EXE
Yes
17 Apr 2019
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:
- Global\CYMULATE_EDR_5cb6f96607ec77ee647e4168
Dropping Routine
This Ransomware drops the following files:
- %Windows%\Temp\CYM_DEBUG_LOGS.txt
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- .accdb
- .bmp
- .contact
- .csv
- .dbf
- .dif
- .doc
- .docm
- .docx
- .dot
- .dotm
- .dotx
- .emf
- .gif
- .htm
- .html
- .jpg
- .mht
- .mhtml
- .mp4
- .odp
- .ods
- .odt
- .png
- .pot
- .potm
- .potx
- .ppa
- .ppam
- .pps
- .ppsm
- .ppsx
- .ppt
- .pptm
- .pptx
- .prn
- .pub
- .rtf
- .slk
- .thmx
- .tif
- .txt
- .vsdx
- .wmf
- .wmv
- .wps
- .xla
- .xlam
- .xls
- .xlsb
- .xlsm
- .xlsx
- .xlt
- .xltm
- .xltx
- .xlw
- .xml
- .xps
It encrypts files found in the following folders:
- %Program Files%\Cymulate\EDR_Attacks\5cb6f96607ec77ee647e4168\EncryptedFiles
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It appends the following extension to the file name of the encrypted files:
- .CymCrypt
SOLUTION
9.850
15.158.03
07 Jun 2019
15.159.00
07 Jun 2019
Step 1
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 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.MSIL.CYMRANSOM.A
- 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 this file
- %Windows%\Temp\CYM_DEBUG_LOGS.txt
Step 5
Scan your computer with your Trend Micro product to delete files detected as Ransom.MSIL.CYMRANSOM.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 the following Trend Micro Support pages for more information:
Step 6
Restore encrypted files from backup.
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