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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
Data Encrypted for Impact - T1486 (b80d107d-fa0d-4b60-9684-b0433e8bdba0) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware System Shutdown/Reboot - T1529 (ff73aa03-0090-4464-83ac-f89e233c02bc) Attack Pattern 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Windows Management Instrumentation - T1047 (01a5a209-b94c-450b-b7f9-946497d91055) Attack Pattern 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Execution Guardrails - T1480 (853c4192-4311-43e1-bfbb-b11b14911852) Attack Pattern 1
File Deletion - T1070.004 (d63a3fb8-9452-4e9d-a60a-54be68d5998c) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Web Service - T1102 (830c9528-df21-472c-8c14-a036bf17d665) Attack Pattern 1
PowerShell - T1059.001 (970a3432-3237-47ad-bcca-7d8cbb217736) 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
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Clear Windows Event Logs - T1070.001 (6495ae23-3ab4-43c5-a94f-5638a2c31fd2) Attack Pattern 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Web Protocols - T1071.001 (df8b2a25-8bdf-4856-953c-a04372b1c161) Attack Pattern 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Modify Registry - T1112 (57340c81-c025-4189-8fa0-fc7ede51bae4) Attack Pattern 1
Visual Basic - T1059.005 (dfd7cc1d-e1d8-4394-a198-97c4cab8aa67) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Data Destruction - T1485 (d45a3d09-b3cf-48f4-9f0f-f521ee5cb05c) Attack Pattern 1
Disable or Modify System Firewall - T1562.004 (5372c5fe-f424-4def-bcd5-d3a8e770f07b) 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
System Network Configuration Discovery - T1016 (707399d6-ab3e-4963-9315-d9d3818cd6a0) 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
Disable or Modify Tools - T1562.001 (ac08589e-ee59-4935-8667-d845e38fe579) 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
System Information Discovery - T1082 (354a7f88-63fb-41b5-a801-ce3b377b36f1) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
File Deletion - T1070.004 (d63a3fb8-9452-4e9d-a60a-54be68d5998c) Attack Pattern Indicator Removal - T1070 (799ace7f-e227-4411-baa0-8868704f2a69) 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
Indicator Removal - T1070 (799ace7f-e227-4411-baa0-8868704f2a69) Attack Pattern Clear Windows Event Logs - T1070.001 (6495ae23-3ab4-43c5-a94f-5638a2c31fd2) Attack Pattern 2
Application Layer Protocol - T1071 (355be19c-ffc9-46d5-8d50-d6a036c675b6) Attack Pattern Web Protocols - T1071.001 (df8b2a25-8bdf-4856-953c-a04372b1c161) 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
Disable or Modify System Firewall - T1562.004 (5372c5fe-f424-4def-bcd5-d3a8e770f07b) Attack Pattern Impair Defenses - T1562 (3d333250-30e4-4a82-9edc-756c68afc529) Attack Pattern 2
Disable or Modify Tools - T1562.001 (ac08589e-ee59-4935-8667-d845e38fe579) Attack Pattern Impair Defenses - T1562 (3d333250-30e4-4a82-9edc-756c68afc529) Attack Pattern 2
Internal Defacement - T1491.001 (8c41090b-aa47-4331-986b-8c9a51a91103) Attack Pattern Defacement - T1491 (5909f20f-3c39-4795-be06-ef1ea40d350b) Attack Pattern 2