Ransom.MSIL.WREATH.A

April 28, 2020
 Analysis by: Kennard Yap
 ALIASES:

Ransom:MSIL/Ryzerlo.A (MICROSOFT); W32/Crypmod.ZA!tr.ransom (FORTINET)

 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: No

  • 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.

  TECHNICAL DETAILS

File Size:

442,880 bytes

File Type:

EXE

Memory Resident:

No

Payload:

Connects to URLs/IPs, Displays graphics/image

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.

Other Details

This Ransomware connects to the following URL(s) to get the affected system's IP address:

  • http://ipinfo.io:443

It encrypts files with the following extensions:

  • .txt
  • .doc
  • .docx
  • .log
  • .msg
  • .odt
  • .pages
  • .rtf
  • .tex
  • .wpd
  • .wps
  • .csv
  • .dat
  • .ged
  • .key
  • .keychain
  • .pps
  • .ppt
  • .pptx
  • .sdf
  • .tar
  • .tax2014
  • .tax2015
  • .vcf
  • .xml
  • .aif
  • .iff
  • .m3u
  • .m4a
  • .mid
  • .mp3
  • .mpa
  • .wav
  • .wma
  • .3g2
  • .3gp
  • .asf
  • .avi
  • .flv
  • .m4v
  • .mov
  • .mp4
  • .mpg
  • .rm
  • .srt
  • .swf
  • .vob
  • .wmv
  • .3dm
  • .3ds
  • .max
  • .obj
  • .bmp
  • .dds
  • .gif
  • .jpg
  • .png
  • .psd
  • .tga
  • .thm
  • .tif
  • .tiff
  • .yuv
  • .ai
  • .eps
  • .ps
  • .svg
  • .indd
  • .pct
  • .pdf
  • .xlr
  • .xls
  • .xlsx
  • .accdb
  • .db
  • .dbf
  • .mdb
  • .pdb
  • .sql
  • .dwg
  • .dxf
  • .asp
  • .aspx
  • .cer
  • .cfm
  • .csr
  • .css
  • .htm
  • .html
  • .js
  • .jsp
  • .php
  • .rss
  • .xhtml
  • .7z
  • .cbr
  • .deb
  • .gz
  • .pkg
  • .rar
  • .rpm
  • .sitx
  • .tar.gz
  • .zip
  • .zipx
  • .bin
  • .cue
  • .dmg
  • .iso
  • .mdf
  • .toast
  • .vcd
  • .c
  • .class
  • .cpp
  • .cs
  • .dtd
  • .fla
  • .h
  • .java
  • .lua
  • .m
  • .pl
  • .py
  • .sh
  • .sln
  • .swift
  • .vb
  • .vcxproj
  • .xcodeproj
  • .bak
  • .tmp
  • .crdownload
  • .ics
  • .msi
  • .part
  • .torrent

It does the following:

  • Encrypts the files in all the drives except C
  • Displays the following as ransom note:

Ransomware Routine

This Ransomware appends the following extension to the file name of the encrypted files:

  • .corona

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.834.02

FIRST VSAPI PATTERN DATE:

07 Apr 2020

VSAPI OPR PATTERN File:

15.835.00

VSAPI OPR PATTERN Date:

08 Apr 2020

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.XXPE50FFF034

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

Scan your computer with your Trend Micro product to delete files detected as Ransom.MSIL.WREATH.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 4

Restore encrypted files from backup.


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