Overview

overview

10

Static

static

10

Chernobyl.exe

windows7-x64

10

Sharing

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General

  • Target
    Chernobyl.exe
  • Size 413KB
  • Sample240303-blvk2abd56
  • SHA256 c28963a7530038ed4bb19864f0dc1d55cf123d2d66059f24f6e4cee39b61e590
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10
discoveryevasionexploitpersistencetrojan

Malware Config

Targets

    • Target
      Chernobyl.exe
    • Size 413KB
    • SHA256 c28963a7530038ed4bb19864f0dc1d55cf123d2d66059f24f6e4cee39b61e590
    • MD5 SHA1 SHA512 SSDEEP
    Score
    10/10
    discoveryevasionexploitpersistencetrojan

    • 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

    • Drops file in System32 directory

    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

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

5
T1112

Credential Access

Discovery

System Information Discovery

2
T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Tasks