Overview

overview

10

Static

static

10

Chernobyl.exe

windows7-x64

Sharing

Copy URL Twitter E-mail

General

  • Target
    Chernobyl.exe
  • Size 423KB
  • Sample240303-ybb29sff26
  • SHA256 3df8578b571811a77eefdf07069bd4d1ba16af70dba81bcf91d8182171728f74
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10
bootkitdiscoveryevasionexploitpersistenceransomwaretrojan

Malware Config

Targets

    • Target
      Chernobyl.exe
    • Size 423KB
    • SHA256 3df8578b571811a77eefdf07069bd4d1ba16af70dba81bcf91d8182171728f74
    • MD5 SHA1 SHA512 SSDEEP
    Score
    10/10
    bootkitdiscoveryevasionexploitpersistenceransomwaretrojan

    • Contains code to disable Windows Defender

      A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

    • Modifies WinLogon for persistence

      persistence

    • UAC bypass

      evasiontrojan

    • Disables RegEdit via registry modification

      evasion

    • Disables Task Manager via registry modification

      evasion

    • Possible privilege escalation attempt

      exploit

    • Modifies file permissions

      discovery

    • Modifies system executable filetype association

      persistence

    • Checks whether UAC is enabled

      evasiontrojan

    • Modifies WinLogon

      persistence

    • Writes to the Master Boot Record (MBR)

      Bootkits write to the MBR to gain persistence at a level below the operating system.

      bootkitpersistence

    • Drops file in System32 directory

    • Sets desktop wallpaper using registry

      ransomware
    behavioral1

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

2
T1547

Winlogon Helper DLL

2
T1547.004

Event Triggered Execution

1
T1546

Change Default File Association

1
T1546.001

Pre-OS Boot

1
T1542

Bootkit

1
T1542.003

Privilege Escalation

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Boot or Logon Autostart Execution

2
T1547

Winlogon Helper DLL

2
T1547.004

Event Triggered Execution

1
T1546

Change Default File Association

1
T1546.001

Defense Evasion

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

File and Directory Permissions Modification

1
T1222

Impair Defenses

1
T1562

Disable or Modify Tools

1
T1562.001

Modify Registry

6
T1112

Pre-OS Boot

1
T1542

Bootkit

1
T1542.003

Credential Access

Discovery

System Information Discovery

2
T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Defacement

1
T1491

Tasks