Resubmissions

21/05/2024, 19:57

240521-ypbcwsgg7x 10

21/05/2024, 16:17

240521-trkxwsbf3v 10

21/05/2024, 14:21

240521-rn7w5sha41 10

20/05/2024, 11:20

240520-nfmdpahb49 10

19/05/2024, 06:44

240519-hhgckaeh71 10

General

  • Target

    https://github.com/theevilteam/KILLER-CLOWN-extracted/raw/main/3MB%20Online%20Install.exe

  • Sample

    240521-rn7w5sha41

Malware Config

Targets

    • Target

      https://github.com/theevilteam/KILLER-CLOWN-extracted/raw/main/3MB%20Online%20Install.exe

    • 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 Enterprise v15

Tasks