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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
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
Execution Guardrails - T1480 (853c4192-4311-43e1-bfbb-b11b14911852) 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
Web Service - T1102 (830c9528-df21-472c-8c14-a036bf17d665) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Internal Defacement - T1491.001 (8c41090b-aa47-4331-986b-8c9a51a91103) Attack Pattern 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Process Discovery - T1057 (8f4a33ec-8b1f-4b80-a2f6-642b2e479580) Attack Pattern 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware PowerShell - T1059.001 (970a3432-3237-47ad-bcca-7d8cbb217736) Attack Pattern 1
Modify Registry - T1112 (57340c81-c025-4189-8fa0-fc7ede51bae4) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
Clear Windows Event Logs - T1070.001 (6495ae23-3ab4-43c5-a94f-5638a2c31fd2) 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
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Windows Management Instrumentation - T1047 (01a5a209-b94c-450b-b7f9-946497d91055) Attack Pattern 1
Data Destruction - T1485 (d45a3d09-b3cf-48f4-9f0f-f521ee5cb05c) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Disable or Modify System Firewall - T1562.004 (5372c5fe-f424-4def-bcd5-d3a8e770f07b) Attack Pattern 1
Exfiltration Over C2 Channel - T1041 (92d7da27-2d91-488e-a00c-059dc162766d) 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
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 Disable or Modify Tools - T1562.001 (ac08589e-ee59-4935-8667-d845e38fe579) Attack Pattern 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Web Protocols - T1071.001 (df8b2a25-8bdf-4856-953c-a04372b1c161) Attack Pattern 1
Command and Scripting Interpreter - T1059 (7385dfaf-6886-4229-9ecd-6fd678040830) Attack Pattern Visual Basic - T1059.005 (dfd7cc1d-e1d8-4394-a198-97c4cab8aa67) Attack Pattern 2
Internal Defacement - T1491.001 (8c41090b-aa47-4331-986b-8c9a51a91103) Attack Pattern Defacement - T1491 (5909f20f-3c39-4795-be06-ef1ea40d350b) Attack Pattern 2
Command and Scripting Interpreter - T1059 (7385dfaf-6886-4229-9ecd-6fd678040830) Attack Pattern PowerShell - T1059.001 (970a3432-3237-47ad-bcca-7d8cbb217736) Attack Pattern 2
Clear Windows Event Logs - T1070.001 (6495ae23-3ab4-43c5-a94f-5638a2c31fd2) Attack Pattern Indicator Removal - T1070 (799ace7f-e227-4411-baa0-8868704f2a69) Attack Pattern 2
Impair Defenses - T1562 (3d333250-30e4-4a82-9edc-756c68afc529) Attack Pattern Disable or Modify System Firewall - T1562.004 (5372c5fe-f424-4def-bcd5-d3a8e770f07b) Attack Pattern 2
File Deletion - T1070.004 (d63a3fb8-9452-4e9d-a60a-54be68d5998c) Attack Pattern Indicator Removal - T1070 (799ace7f-e227-4411-baa0-8868704f2a69) Attack Pattern 2
Impair Defenses - T1562 (3d333250-30e4-4a82-9edc-756c68afc529) Attack Pattern Disable or Modify Tools - T1562.001 (ac08589e-ee59-4935-8667-d845e38fe579) 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