General

  • Target

    ExLoader_Installer1.exe

  • Size

    20.2MB

  • Sample

    240523-vwqjlsad29

  • MD5

    06d4e995805a2afd7496f4f4f0000fd2

  • SHA1

    db80fb0f047f5754aa33781268421407fd07d29e

  • SHA256

    7ad99c1905e0c0ca46bd97650a50645592a6006f05062aa4580198c41c6491a1

  • SHA512

    fd4d245e28e6584f7fe3489bccb35341f5957933de442c259a507e04bf07f018bbb1bd769d638a07a42ce7a1677c6bf1aa237f4b22b3a5dcf9ccbc5af43150d7

  • SSDEEP

    393216:QVZarTJXmFjzqREtDlwcPUTc9t37DMncawXAKaVnayxZtFDb:SZ4TJXmFjzqa5lYTiInf46VnvHr/

Malware Config

Targets

    • Target

      ExLoader_Installer1.exe

    • Size

      20.2MB

    • MD5

      06d4e995805a2afd7496f4f4f0000fd2

    • SHA1

      db80fb0f047f5754aa33781268421407fd07d29e

    • SHA256

      7ad99c1905e0c0ca46bd97650a50645592a6006f05062aa4580198c41c6491a1

    • SHA512

      fd4d245e28e6584f7fe3489bccb35341f5957933de442c259a507e04bf07f018bbb1bd769d638a07a42ce7a1677c6bf1aa237f4b22b3a5dcf9ccbc5af43150d7

    • SSDEEP

      393216:QVZarTJXmFjzqREtDlwcPUTc9t37DMncawXAKaVnayxZtFDb:SZ4TJXmFjzqa5lYTiInf46VnvHr/

    • Modifies WinLogon for persistence

    • UAC bypass

    • Deletes shadow copies

      Ransomware often targets backup files to inhibit system recovery.

    • Downloads MZ/PE file

    • Drops file in Drivers directory

    • Modifies Installed Components in the registry

    • Checks computer location settings

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

    • Drops startup file

    • Executes dropped EXE

    • Loads dropped DLL

    • Modifies system executable filetype association

    • Registers COM server for autorun

    • Adds Run key to start application

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Legitimate hosting services abused for malware hosting/C2

    • Writes to the Master Boot Record (MBR)

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

    • Drops file in System32 directory

    • Sets desktop wallpaper using registry

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v13

Execution

Windows Management Instrumentation

1
T1047

Scheduled Task/Job

1
T1053

Persistence

Boot or Logon Autostart Execution

4
T1547

Registry Run Keys / Startup Folder

3
T1547.001

Winlogon Helper DLL

1
T1547.004

Event Triggered Execution

1
T1546

Change Default File Association

1
T1546.001

Pre-OS Boot

1
T1542

Bootkit

1
T1542.003

Scheduled Task/Job

1
T1053

Privilege Escalation

Boot or Logon Autostart Execution

4
T1547

Registry Run Keys / Startup Folder

3
T1547.001

Winlogon Helper DLL

1
T1547.004

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Event Triggered Execution

1
T1546

Change Default File Association

1
T1546.001

Scheduled Task/Job

1
T1053

Defense Evasion

Modify Registry

8
T1112

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Impair Defenses

1
T1562

Disable or Modify Tools

1
T1562.001

Indicator Removal

1
T1070

File Deletion

1
T1070.004

Pre-OS Boot

1
T1542

Bootkit

1
T1542.003

Discovery

Query Registry

5
T1012

System Information Discovery

5
T1082

Peripheral Device Discovery

1
T1120

Command and Control

Web Service

1
T1102

Impact

Inhibit System Recovery

1
T1490

Defacement

1
T1491

Tasks