Ransom.Win32.AVOSLOCKER.A
Trojan-Ransom.Avaddon (IKARUS)
Windows
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. It drops files as ransom note.
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 adds the following mutexes to ensure that only one of its copies runs at any one time:
- ievah8eVki3Ho4oo
Other Details
This Ransomware does the following:
- This Ransomware displays its encryption progress in console
- It encrypts files found in the following drives:
- Fixed Drives
- Removable Drives
- Network Share Drives
- It checks if the file it tries to encrypt is being ran by another process
- If the file is currently being used by another process, the ransomware kills the process and proceeds with encryption
It accepts the following parameters:
- h -> hide the console
- n -> skip encryption of network share drives
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- doc
- docx
- xls
- xlsx
- ppt
- pptx
- pst
- ost
- msg
- eml
- vsd
- vsdx
- txt
- csv
- rtf
- wks
- wk1
- dwg
- onetoc2
- snt
- jpeg
- jpg
- docb
- docm
- dot
- dotm
- dotx
- xlsm
- xlsb
- xlw
- xlt
- xlm
- xlc
- xltx
- xltm
- pptm
- pot
- pps
- ppsm
- ppsx
- ppam
- potx
- potm
- edb
- hwp
- 602
- sxi
- sti
- sldx
- sldm
- sldm
- vdi
- vmdk
- vmx
- gpg
- aes
- ARC
- PAQ
- bz2
- tbk
- bak
- tar
- tgz
- gz
- 7z
- rar
- zip
- backup
- iso
- vcd
- bmp
- png
- gif
- raw
- cgm
- tif
- tiff
- nef
- psd
- ai
- svg
- djvu
- m4u
- m3u
- mid
- wma
- flv
- 3g2
- mkv
- 3gp
- mp4
- mov
- avi
- asf
- mpeg
- vob
- mpg
- wmv
- fla
- swf
- wav
- mp3
- sh
- class
- jar
- java
- rb
- asp
- php
- jsp
- brd
- sch
- dch
- dip
- pl
- vb
- vbs
- ps1
- bat
- cmd
- js
- asm
- h
- pas
- cpp
- c
- cs
- suo
- sln
- ldf
- mdf
- ibd
- myi
- myd
- frm
- odb
- dbf
- db
- mdb
- accdb
- sql
- sqlitedb
- sqlite3
- asc
- lay6
- lay
- mml
- sxm
- otg
- odg
- uop
- std
- sxd
- otp
- odp
- wb2
- slk
- dif
- stc
- sxc
- ots
- ods
- 3dm
- max
- 3ds
- uot
- stw
- sxw
- ott
- odt
- pem
- p12
- csr
- crt
- key
- pfx
- der
- dat
It appends the following extension to the file name of the encrypted files:
- {Original Filename}\{Original Extension}.avos
It drops the following file(s) as ransom note:
- %Desktop%\GET_YOUR_FILES_BACK.txt
- {Encrypted Directory}\GET_YOUR_FILES_BACK.txt
SOLUTION
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.XXPE50FFF046
Step 2
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 3
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 4
Restart in Safe Mode
Step 5
Search and delete these files
- %Desktop%\GET_YOUR_FILES_BACK.txt
- {Encrypted Directory}\GET_YOUR_FILES_BACK.txt
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.Win32.AVOSLOCKER.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 this Knowledge Base page for more information.
Step 7
Restore encrypted files from backup.
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