Analysis by: Karen Ivy Titiwa
ALIASES:

HEUR:Trojan-Ransom.MSIL.Gen.gen( KASPERSKY); Trojan:Win32/Ymacco.AA3E(MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

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 encrypts files found in specific folders.

  TECHNICAL DETAILS

File Size: 219,136 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 20 Aug 2020
Payload: Displays message/message boxes, Encrypts files

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 does the following:

  • It displays the following as ransom note:

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .der
  • .pfx
  • .crt
  • .csr
  • .p12
  • .pem
  • .odt
  • .ott
  • .sxw
  • .stw
  • .uot
  • .3ds
  • .max
  • .3dm
  • .ods
  • .ots
  • .sxc
  • .stc
  • .dif
  • .slk
  • .wb3
  • .odp
  • .otp
  • .sxd
  • .std
  • .udp
  • .odg
  • .otg
  • .sxm
  • .mml
  • .lay
  • .lay6
  • .asc
  • .sqlite3
  • .sqlitedb
  • .sql
  • .accdb
  • .mdb
  • .db
  • .dbf
  • .odb
  • .frm
  • .myd
  • .myi
  • .ibd
  • .mdf
  • .ldf
  • .sln
  • .suo
  • .cs
  • .c
  • cpp
  • .pas
  • .h
  • .asm
  • .js
  • .cmd
  • .bat
  • .ps1
  • .vbs
  • .vb
  • .pl
  • .dip
  • .dch
  • .sch
  • .brd
  • .jsp
  • .php
  • .asp
  • .rb
  • .java
  • .jar
  • .class
  • .sh
  • .mp3
  • .wav
  • .swf
  • .fla
  • .wmv
  • .mpg
  • .vob
  • .mpeg
  • .asf
  • .avi
  • .mov
  • .mp4
  • .3gp
  • .mkv
  • .3g2
  • .flv
  • .wma
  • .mid
  • .m3u
  • .m4u
  • .djvu
  • .svg
  • .ai
  • .psd
  • .nef
  • .tiff
  • .tif
  • .cgm
  • .raw
  • .gif
  • .png
  • .bmp
  • .jpg
  • .jpeg
  • .vcd
  • .backup
  • .zip
  • .rar
  • .7z
  • .gz
  • .tgz
  • .tar
  • .bak
  • .tbk
  • .bz2
  • .paq
  • .arc
  • .aes
  • .gpg
  • .vmx
  • .vmdk
  • .vdi
  • .sldm
  • .sldx
  • .sti
  • .sxi
  • .602
  • .hwp
  • .snt
  • .onetoc2
  • .dwg
  • .pdf
  • .wk1
  • .wks
  • .123
  • .rtf
  • .csv
  • .txt
  • .vsdx
  • .vsd
  • .edb
  • .eml
  • .msg
  • .ost
  • .pst
  • .potm
  • .potx
  • .ppam
  • .ppsm
  • .ppsx
  • .pps
  • .pot
  • .pptm
  • .pptx
  • .ppt
  • .xltm
  • .xltx
  • .xlc
  • .xlm
  • .xlt
  • .xlw
  • .xlsb
  • .xlsm
  • .xlsx
  • .xls
  • .dotx
  • .dotm
  • .dot
  • .docm
  • .docx
  • .doc

It encrypts files found in the following folders:

  • %User Profile%

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It appends the following extension to the file name of the encrypted files:

  • {original filename}.{original extension}.{random file extension}

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 16.176.05
FIRST VSAPI PATTERN DATE: 20 Aug 2020
VSAPI OPR PATTERN File: 16.177.00
VSAPI OPR PATTERN Date: 21 Aug 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.XXPE50FFF036

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 normal mode and scan your computer with your Trend Micro product for files detected as Ransom.MSIL.RANSOMBLOX.AA. 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 5

Restore encrypted files from backup.


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