Analysis by: Alyssa Christelle Ramos
ALIASES:

Generic.Ransom.Godra.DFD485DB(BITDEFENDER)

 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: Dropped by other malware, 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.

However, as of this writing, the said sites are inaccessible.

It encrypts files with specific file extensions. It drops files as ransom note.

  TECHNICAL DETAILS

File Size: 350,720 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 24 Dec 2020
Payload: Connects to URLs/IPs, Collects system information, 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.

Installation

This Ransomware drops and executes the following files:

  • %User Temp%\Prijedlog_za_ovrhu_urbr_220-2017.pdf -> contains User ID indicated on the ransom note

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

Download Routine

This Ransomware accesses the following websites to download files:

  • https://www.{BLOCKED}a.online/ovr/a.php

Other Details

This Ransomware displays the following message boxes:


However, as of this writing, the said sites are inaccessible.

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .3g2
  • .3gp
  • .7zip
  • .aep
  • .aepx
  • .aet
  • .aif
  • .as3
  • .asf
  • .asp
  • .avi
  • .bat
  • .cpp
  • .dat
  • .docb
  • .dwg
  • .dxb
  • .dxf
  • .efx
  • .eps
  • .fdb
  • .fla
  • .gif
  • .gpd
  • .html
  • .jar
  • .java
  • .jpeg
  • .jpg
  • .js
  • .lnk
  • .m3u
  • .m4u
  • .mid
  • .mkv
  • .mp3
  • .mp4
  • .mpeg
  • .obj
  • .odp
  • .pdf
  • .php
  • .png
  • .pot
  • .potm
  • .potx
  • .ppam
  • .pps
  • .ppsx
  • .ppt
  • .pptx
  • .ppxm
  • .ps1
  • .py
  • .rtf
  • .sav
  • .ses
  • .sql
  • .srf
  • .svg
  • .vcf
  • .vob
  • .wav
  • .webm
  • .wmv
  • .xlm
  • .xlt
  • .xltx
  • .xml
  • .zip

It avoids encrypting files with the following strings in their file path:

  • Videos
  • Winnt
  • Application Data
  • Preflogs
  • Program Files(x86)
  • Program Files
  • Program Data
  • Temp
  • Recycle Bin
  • Boot
  • Windows

It drops the following file(s) as ransom note:

  • {Encrypted Directory}\KAKO OTKLJUČATI VAŠE DATOTEKE.log

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 16.446.04
FIRST VSAPI PATTERN DATE: 30 Dec 2020
VSAPI OPR PATTERN File: 16.447.00
VSAPI OPR PATTERN Date: 31 Dec 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.XXPE50FFF039

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

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Temp%\Prijedlog_za_ovrhu_urbr_220-2017.pdf
  • {Encrypted Directory}\KAKO OTKLJUČATI VAŠE DATOTEKE.log

Step 5

Restore encrypted files from backup.


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