Ransom.Linux.KUIPER.THLODBC
UDS:Trojan-Ransom.Linux.Agent.a (KASPERSKY)
Linux
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
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 executes then deletes itself afterward.
It drops files as ransom note. It avoids encrypting files with the following file extensions.
TECHNICAL DETAILS
2,314,240 bytes
No
04 Dec 2023
Deletes files, Encrypts files, Displays message/message boxes
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 processes:
- If the argument -reboot is not set to "no":
- /bin/bash -c reboot
- If the argument -safe is set to "yes":
- /bin/bash -c shutdown /r /t 0
It executes then deletes itself afterward.
Other Details
This Ransomware does the following:
- It prints the number of processors and execution logs to the console.
- It checks if the file size is greater than 466,616,310 bytes. Only a certain percentage of the file will be encrypted.
- It checks if the file extension of the large file is any of the following. A different percentage of the file will be encrypted.
- .backup
- .blend1
- .iso
- .jpa
- .jpg
- .mbk
- .mp3
- .mp4
- .nba
- .png
- .pvm
- .raw
- .sis
- .spg
- .vdi
- .vhd
- .vmx
- .vsv
- .zip
- .abk
- .acp
- .adi
- .bkz
- .doc
- .dsb
- .gho
- .abu1
- .avdx
- .avhd
- .docx
- .qbmb
- .vhdx
- .vmcx
- .vmdk
- .vmem
- .vmrs
- .vmsd
- .vmsn
- .xlsx
- .vbox-prev
- .scripa
- .subvol
- .wx
- .nvram
- .qcow2
- It checks if the file extension is any of the following. These files will be encrypted in its entirety regardless of the file size.
- .sql
- .txt
- .db
- .json
It accepts the following parameters:
- -help → Displays the help menu.
- -chacha {yes|no} → Use chacha20 for encrypt files < 500 MB. (Defualt: no)
- -kill {yes|no} → Kill loop for taskmgr, cmd, regedit, powershell. (Default: yes)
- -note {yes|no} → Paste note after directory change and encryption. (Default: yes)
- -p {path} → Target folder to encrypt files
- -reboot {yes|no} → Reboot after end encryption of all files or disks. (Default: yes)
- -rename {yes|no} → Rename file after encryption. (Default: yes)
- -safe {yes|no} → Reboot system in safe mode and start encryption. (Default: no)
- -shared {auto|ip} → Discover and mount remote shareds
- -spread {yes|no} → Self spread from DC to all hosts on local network. (Default: yes)
Ransomware Routine
This Ransomware appends the following extension to the file name of the encrypted files:
- .kuiper
It drops the following file(s) as ransom note:
- {Encrypted Directory}/README_TO_DECRYPT.txt
It avoids encrypting files with the following file extensions:
- .ini
- .key
- .cert
- .private_key
- .man
- .cfg
- .DATA
- .inf
- .LOG2
- .LOG
- .LOG1
- .ttf
- .regtrans-ms
- .search-ms
- .desktop
- .Desktop
- .tmp
- .DAT
- .TMP
- .so
- .dll
- .exe
- .go
- .msi
- .html
- .bak
- .dat
- .blf
- .386
- .lnk
- .bat
- .cmd
- .sys
- .crlk
- .bin
- .elf
- .rtf
- .com
- .kuiper
SOLUTION
9.800
18.858.02
04 Dec 2023
18.859.00
05 Dec 2023
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.ELF.TRX.XXELFC1DFF036
Step 2
Scan your computer with your Trend Micro product to delete files detected as Ransom.Linux.KUIPER.THLODBC. 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 3
Restore encrypted files from backup.
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