RANSOM_RUBY.A
Trojan.Ruby.Filecoder (Ikarus), Ruby.Encoder.1 (DrWeb), Ruby/Filecoder.A (ESET-NOD32)
Linux
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
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.
TECHNICAL DETAILS
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:
- /client_id.txt
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- db
- csv
- sql
- xml
- cer
- cgi
- htm
- html
- xhtml
- css
- js
- php
- dat
- log
- gif
- jpg
- jpeg
- png
- svg
- tif
- tiff
- raw
- ps
- psd
- pps
- ppt
- pptx
- xlr
- xls
- xlsx
- doc
- docx
- rtf
- txt
- wks
- wps
- py
- jar
- c
- class
- cpp
- cs
- h
- swift
- mp3
- wav
- avi
- mp4
- mkv
- zip
- tar.gz
- tar
It appends the following extension to the file name of the encrypted files:
- .locked
NOTES:
It should generate randomly generated IP address and send to it the IV and keys but the code is incomplete.
The ransomware would sleep for 24 hours if randomly generated IP address cannot be pinged.
The list of the files to be encrypted is located in /home/dipper/Desktop/text.rtf, but this malware would not write any list of files since the code is incomplete.
SOLUTION
Step 1
Scan your computer with your Trend Micro product to delete files detected as RANSOM_RUBY.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 2
Restore encrypted files from backup.
NOTES:
Please delete /client_id.txt and /home/dipper/Desktop/text.rtf.
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