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Ransom.Linux.CERBER.THFAOBB

June 22, 2022
 Analysis by: Mc Justine De Guzman
 ALIASES:

Trojan-Ransom.Cerber (IKARUS)

 PLATFORM:

Linux

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW


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 drops files as ransom note. It avoids encrypting files with the following file extensions.

  TECHNICAL DETAILS

File Size:

1,071,476 bytes

File Type:

ELF

Memory Resident:

No

Initial Samples Received Date:

10 Jun 2022

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:

  • /var/lock/init-rsysd.locked
  • /dev/shm/init-rsysd.locked
  • /var/tmp/init-rsysd
  • /var/tmp/log.1
  • /var/tmp/log.2

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .jpg
  • .jpeg
  • .bmp
  • .png
  • .dib
  • .gif
  • .tif
  • .tiff
  • .psd
  • .gpg
  • .svg
  • .raw
  • .cgm
  • .nef
  • .wps
  • .wpt
  • .doc
  • .dot
  • .docx
  • .dotx
  • .docm
  • .dotm
  • .docb
  • .rtf
  • .mml
  • .sxm
  • .otg
  • .odg
  • .uop
  • .ppt
  • .pptx
  • .pptm
  • .dps
  • .dpt
  • .pot
  • .potx
  • .potm
  • .pps
  • .ppsx
  • .ppsm
  • .ppam
  • .std
  • .sxd
  • .sti
  • .sxi
  • .otp
  • .odp
  • .wks
  • .et,
  • .ett
  • .xls
  • .xlt
  • .xltx
  • .xltm
  • .xlsx
  • .xlsb
  • .xlsm
  • .csv
  • .dif
  • .slk
  • .xlw
  • .xlm
  • .xlc
  • .stc
  • .sxc
  • .ots
  • .ods
  • .hwp
  • .max
  • .uot
  • .stw
  • .sxw
  • .ott
  • .odt
  • .drl
  • .pem
  • .csr
  • .crt
  • .key
  • .htm
  • .mht
  • .mhtml
  • .xml
  • .dat
  • .conf
  • .rar
  • .zip
  • .7z0
  • .arc
  • .paq
  • .tar.bz2
  • .tbk
  • .tar
  • .tgz
  • .gz
  • .bak
  • .locky
  • .djv
  • .djvu
  • .pdf
  • .txt
  • .vdi
  • .vmdk
  • .vmx
  • .torrent
  • .log
  • .mp3
  • .mp4
  • .mid
  • .wma
  • .flv
  • .mkv
  • .rmvb
  • .mov
  • .avi
  • .asf
  • .mpeg
  • .vob
  • .mpg
  • .wmv
  • .fla
  • .swf
  • .wav
  • .qcow2
  • .aes
  • .brd
  • .sch
  • .dch
  • .dip
  • .pas
  • .asc
  • .lay6
  • .lay
  • .ms11
  • .sldm
  • .sldx
  • .php
  • .asp
  • .aspx
  • .jsp
  • .js
  • .css
  • .cmd
  • .bat
  • .class
  • .jar
  • .java
  • .war
  • .vbs
  • .asm
  • .cpp
  • .ldf
  • .mdf
  • .ibd
  • .myi
  • .myd
  • .frm
  • .odb
  • .dbf
  • .ora
  • .ctl
  • .mdb
  • .sql
  • .sqlitedb
  • .sqlite3
  • .db

It avoids encrypting files found in the following folders:

  • /boot
  • /run
  • /proc
  • /sys
  • /dev
  • /etc
  • /sbin
  • /bin
  • /lib
  • /lib64
  • /usr/sbin
  • /usr/bin
  • /var/run
  • /usr/include
  • /usr/share
  • /usr/src
  • /var/lock
  • /var/tmp
  • /tmp

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

  • {Encrypted directory}\__$$RECOVERY_README$$__.html

It avoids encrypting files with the following file extensions:

  • .locked
  • .exe

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.618.03

FIRST VSAPI PATTERN DATE:

10 Jun 2022

VSAPI OPR PATTERN File:

17.619.00

VSAPI OPR PATTERN Date:

11 Jun 2022

Scan your computer with your Trend Micro product to delete files detected as Ransom.Linux.CERBER.THFAOBB. 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:


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