Overview

overview

10

Static

static

10

melhor.exe

windows10-ltsc_2021-x64

10

melhor.exe

windows11-21h2-x64

10

Sharing

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General

  • Target
    melhor.exe
  • Size 26KB
  • Sample260703-3sbv2sdv8r
  • SHA256 17fc5fe0692a6e846e26a9340e3e2175b1599364128b4d2363742bf315cb7e9f
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
chaosdefense_evasionevasionexecutionimpactpersistenceransomwarespywarestealer

Malware Config

Extracted

Path

  • C:\Users\Admin\AppData\Local\read_it.txt

Ransom Note
  • All of your files have been encrypted Your computer was infected with a ransomware virus. Your files have been encrypted and you won't be able to decrypt them without our help.What can I do to get my files back?You can buy our special decryption software, this software will allow you to recover all of your data and remove the ransomware from your computer.The price for the software is $1,500. Payment can be made in Bitcoin only. How do I pay, where do I get Bitcoin? Purchasing Bitcoin varies from country to country, you are best advised to do a quick google search yourself to find out how to buy Bitcoin. Many of our customers have reported these sites to be fast and reliable: Coinmama - hxxps://www.coinmama.com Bitpanda - hxxps://www.bitpanda.com Payment informationAmount: 0.1473766 BTC Bitcoin Address: bc1qlnzcep4l4ac0ttdrq7awxev9ehu465f2vpt9x0

Targets

    • Target
      melhor.exe
    • Size 26KB
    • SHA256 17fc5fe0692a6e846e26a9340e3e2175b1599364128b4d2363742bf315cb7e9f
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    defense_evasionevasionexecutionchaosimpactpersistenceransomwarespywarestealer

    • Chaos Ransomware

    • Family: Chaos

      Ransomware family first seen in June 2021.

      ransomwarechaos

    • Deletes shadow copies

      Ransomware often targets backup files to inhibit system recovery.

      ransomwaredefense_evasionimpactexecution

    • Modifies boot configuration data using bcdedit

      ransomwareevasion

    • Deletes backup catalog

      Uses wbadmin.exe to inhibit system recovery.

      ransomware

    • Disables Task Manager via registry modification

      defense_evasion

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Drops startup file

    • Executes dropped EXE

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

      spywarestealer

    • Drops desktop.ini file(s)

    behavioral1behavioral2

MITRE ATT&CK Enterprise v16

Tasks