Analysis by: Julie Anne Cabuhat
ALIASES:

Trojan:Win32/Dynamer!ac (Microsoft), TR/KillDisk.jvego (Avira)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

This Trojan 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: 176,128 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 20 Dec 2016
Payload: Encrypts files, Displays graphics/image

Arrival Details

This Trojan 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 Trojan encrypts files with the following extensions:

  • .vmdk
  • .vhd
  • .vmem
  • .vdi
  • .vhdx
  • .vmx
  • .ovf
  • .vmc
  • .vmfx
  • .vmxf
  • .hdd
  • .vbox
  • .vcb
  • .vmsd
  • .vfd
  • .pvi
  • .hdd
  • .bin
  • .avhd
  • .vsv
  • .ost
  • .pst
  • .mkv
  • .pem
  • .jrs
  • .cer
  • .pvk
  • .pfx
  • .pd
  • .pio
  • .csr
  • .crl
  • .p7c
  • .piz
  • .p7b
  • .spc
  • .p7r
  • .io
  • .pyc
  • .dwg
  • .max
  • .dxf
  • .3ds
  • .ai
  • .conf
  • .my
  • .ost
  • .pst
  • .mkv
  • .mp3
  • .wav
  • .oda
  • .sh
  • .py
  • .ps
  • .ps1
  • .php
  • .aspx
  • .asp
  • .rb
  • .js
  • .git
  • .mdf
  • .pdf
  • .djvu
  • .doc
  • .docx
  • .xls
  • .xlsx
  • .jar
  • .ppt
  • .pptx
  • .rtf
  • .vsd
  • .vsdx
  • .jpeg
  • .jpg
  • .png
  • .tiff
  • .msi
  • .zip
  • .rar
  • .7z
  • .tar
  • .gz
  • .eml
  • .mail
  • .ml
  • .vbm
  • .vbk
  • .dat
  • .crt
  • .key
  • .kdbx
  • .bak
  • .back
  • .dr
  • .bkf
  • .cfg
  • .fdb
  • .mdb
  • .accdb
  • .gdb
  • .wdb
  • .csv
  • .sdf
  • .myd
  • .dbf
  • .sql
  • .edb
  • .mdf
  • .ib
  • .db3
  • .db4
  • .accdc
  • .mdbx
  • .sl3
  • .sqlite3
  • .nsn
  • .dbc
  • .dbx
  • .sdb
  • .ibz
  • .sqlite

NOTES:

This ransomware locks the screen with the following ransom note after it encrypts the all the files:

It also clears the Windows Event Logs using wevutil.exe with the following parameters:

  • wevutil clear-log Application
  • wevutil clear-log Security
  • wevutil clear-log Setup
  • wevutil clear-log System

    •   SOLUTION

    Minimum Scan Engine: 9.800
    FIRST VSAPI PATTERN FILE: 13.124.06
    FIRST VSAPI PATTERN DATE: 20 Dec 2016
    VSAPI OPR PATTERN File: 13.125.00
    VSAPI OPR PATTERN Date: 21 Dec 2016

    Step 1

    Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

    Step 2

    Restart in Safe Mode

    [ Learn More ]

    Step 3

    Restore encrypted files from backup.

    Step 4

    Scan your computer with your Trend Micro product to delete files detected as RANSOM_KILLDISK.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.


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