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ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070)

ShrinkLocker is a VBS-based malicious script that leverages the legitimate Bitlocker application to encrypt files on victim systems for ransom. ShrinkLocker functions by using Bitlocker to encrypt files, then renames impacted drives to the adversary’s contact email address to facilitate communication for the ransom payment.(Citation: Kaspersky ShrinkLocker 2024)(Citation: Splunk ShrinkLocker 2024)

Cluster A Galaxy A Cluster B Galaxy B Level
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware File Deletion - T1070.004 (d63a3fb8-9452-4e9d-a60a-54be68d5998c) Attack Pattern 1
Data Encrypted for Impact - T1486 (b80d107d-fa0d-4b60-9684-b0433e8bdba0) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
Web Protocols - T1071.001 (df8b2a25-8bdf-4856-953c-a04372b1c161) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
Disable or Modify System Firewall - T1686 (eec096b8-c207-43df-b6c1-11523861e452) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Disable or Modify Tools - T1685 (bbde9781-60aa-4b8a-a911-895b0c1b3872) Attack Pattern 1
Visual Basic - T1059.005 (dfd7cc1d-e1d8-4394-a198-97c4cab8aa67) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
System Time Discovery - T1124 (f3c544dc-673c-4ef3-accb-53229f1ae077) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
System Information Discovery - T1082 (354a7f88-63fb-41b5-a801-ce3b377b36f1) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
Clear Windows Event Logs - T1685.005 (75b9a4d2-d4e2-4ca1-9aab-1badd9e05fd0) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
Internal Defacement - T1491.001 (8c41090b-aa47-4331-986b-8c9a51a91103) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Execution Guardrails - T1480 (853c4192-4311-43e1-bfbb-b11b14911852) Attack Pattern 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Disk Structure Wipe - T1561.002 (0af0ca99-357d-4ba1-805f-674fdfb7bef9) Attack Pattern 1
Web Service - T1102 (830c9528-df21-472c-8c14-a036bf17d665) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
Process Discovery - T1057 (8f4a33ec-8b1f-4b80-a2f6-642b2e479580) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
Windows Management Instrumentation - T1047 (01a5a209-b94c-450b-b7f9-946497d91055) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Exfiltration Over C2 Channel - T1041 (92d7da27-2d91-488e-a00c-059dc162766d) Attack Pattern 1
PowerShell - T1059.001 (970a3432-3237-47ad-bcca-7d8cbb217736) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
System Shutdown/Reboot - T1529 (ff73aa03-0090-4464-83ac-f89e233c02bc) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
System Network Configuration Discovery - T1016 (707399d6-ab3e-4963-9315-d9d3818cd6a0) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Modify Registry - T1112 (57340c81-c025-4189-8fa0-fc7ede51bae4) Attack Pattern 1
Data Destruction - T1485 (d45a3d09-b3cf-48f4-9f0f-f521ee5cb05c) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
Indicator Removal - T1070 (799ace7f-e227-4411-baa0-8868704f2a69) Attack Pattern File Deletion - T1070.004 (d63a3fb8-9452-4e9d-a60a-54be68d5998c) Attack Pattern 2
Web Protocols - T1071.001 (df8b2a25-8bdf-4856-953c-a04372b1c161) Attack Pattern Application Layer Protocol - T1071 (355be19c-ffc9-46d5-8d50-d6a036c675b6) Attack Pattern 2
Visual Basic - T1059.005 (dfd7cc1d-e1d8-4394-a198-97c4cab8aa67) Attack Pattern Command and Scripting Interpreter - T1059 (7385dfaf-6886-4229-9ecd-6fd678040830) Attack Pattern 2
Clear Windows Event Logs - T1685.005 (75b9a4d2-d4e2-4ca1-9aab-1badd9e05fd0) Attack Pattern Disable or Modify Tools - T1685 (bbde9781-60aa-4b8a-a911-895b0c1b3872) Attack Pattern 2
Defacement - T1491 (5909f20f-3c39-4795-be06-ef1ea40d350b) Attack Pattern Internal Defacement - T1491.001 (8c41090b-aa47-4331-986b-8c9a51a91103) Attack Pattern 2
Disk Wipe - T1561 (1988cc35-ced8-4dad-b2d1-7628488fa967) Attack Pattern Disk Structure Wipe - T1561.002 (0af0ca99-357d-4ba1-805f-674fdfb7bef9) Attack Pattern 2
PowerShell - T1059.001 (970a3432-3237-47ad-bcca-7d8cbb217736) Attack Pattern Command and Scripting Interpreter - T1059 (7385dfaf-6886-4229-9ecd-6fd678040830) Attack Pattern 2