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Ransom.Win32.SABLOH.THCOIBA

March 30, 2021
 Analysis by: Karen Ivy Titiwa
 ALIASES:

Ransom:Win32/SarblohCrypt.PA!MTB(MICROSOFT); W32/Agent.AZSX!tr.ransom(FORTINET)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

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 may be downloaded by other malware/grayware/spyware from remote sites.

It encrypts files with specific file extensions. It drops files as ransom note.

  TECHNICAL DETAILS

File Size:

21,504 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

08 Mar 2021

Payload:

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.

It may be downloaded by other malware/grayware/spyware from remote sites.

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .txt
  • .dat
  • .der
  • .pfx
  • .key
  • .crt
  • .csr
  • .p12
  • .pem
  • .odt
  • .ott
  • .sxw
  • .stw
  • .uot
  • .3ds
  • .max
  • .3dm
  • .ods
  • .ots
  • .sxc
  • .stc
  • .dif
  • .slk
  • .wb2
  • .odp
  • .otp
  • .sxd
  • .std
  • .uop
  • .odg
  • .otg
  • .sxm
  • .mml
  • .lay
  • .lay6
  • .asc
  • .sqlite3
  • .sqlitedb
  • .sql
  • .accdb
  • .mdb
  • .db
  • .dbf
  • .odb
  • .frm
  • .myd
  • .myi
  • .ibd
  • .mdf
  • .ldf
  • .sln
  • .suo
  • .cs
  • .c
  • .cpp
  • .pas
  • .h
  • .asm
  • .js
  • .cmd
  • .bat
  • .ps1
  • .vbs
  • .vb
  • .pl
  • .dip
  • .dch
  • .sch
  • .brd
  • .jsp
  • .php
  • .asp
  • .rb
  • .java
  • .jar
  • .class
  • .sh
  • .mp3
  • .wav
  • .swf
  • .fla
  • .wmv
  • .mpg
  • .vob
  • .mpeg
  • .asf
  • .avi
  • .mov
  • .mp4
  • .3gp
  • .mkv
  • .3g2
  • .flv
  • .wma
  • .mid
  • .m3u
  • .m4u
  • .djvu
  • .svg
  • .ai
  • .psd
  • .nef
  • .tiff
  • .tif
  • .cgm
  • .raw
  • .gif
  • .png
  • .bmp
  • .jpg
  • .jpeg
  • .vcd
  • .iso
  • .backup
  • .zip
  • .rar
  • .7z
  • .gz
  • .tgz
  • .tar
  • .bak
  • .tbk
  • .bz2
  • .PAQ
  • .ARC
  • .aes
  • .gpg
  • .vmx
  • .vmdk
  • .vdi
  • .sldm
  • .sldx
  • .sti
  • .sxi
  • .602
  • .hwp
  • .snt
  • .onetoc2
  • .dwg
  • .pdf
  • .wk1
  • .wks
  • .123
  • .rtf
  • .csv
  • .vsdx
  • .vsd
  • .edb
  • .eml
  • .msg
  • .ost
  • .pst
  • .potm
  • .potx
  • .ppam
  • .ppsx
  • .ppsm
  • .pps
  • .pot
  • .pptm
  • .pptx
  • .ppt
  • .xltm
  • .xltx
  • .xlc
  • .xlm
  • .xlt
  • .xlw
  • .xlsb
  • .xlsm
  • .xlsx
  • .xls
  • .dotx
  • .dotm
  • .dot
  • .docm
  • .docb
  • .docx
  • .doc

It appends the following extension to the file name of the encrypted files:

  • .sarbloh

It drops the following file(s) as ransom note:

  • %Desktop%\README_SARBLOH.txt

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

16.584.01

FIRST VSAPI PATTERN DATE:

09 Mar 2021

VSAPI OPR PATTERN File:

16.585.00

VSAPI OPR PATTERN Date:

10 Mar 2021

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.XXPE50FFF042

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

Search and delete these files

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
  • %Desktop%\README_SARBLOH.txt

Step 4

Scan your computer with your Trend Micro product to delete files detected as Ransom.Win32.SABLOH.THCOIBA. 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 5

Restore encrypted files from backup.


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