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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 Disable or Modify Tools - T1685 (bbde9781-60aa-4b8a-a911-895b0c1b3872) Attack Pattern 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Disable or Modify System Firewall - T1686 (eec096b8-c207-43df-b6c1-11523861e452) Attack Pattern 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Visual Basic - T1059.005 (dfd7cc1d-e1d8-4394-a198-97c4cab8aa67) Attack Pattern 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware System Time Discovery - T1124 (f3c544dc-673c-4ef3-accb-53229f1ae077) Attack Pattern 1
System Information Discovery - T1082 (354a7f88-63fb-41b5-a801-ce3b377b36f1) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware Clear Windows Event Logs - T1685.005 (75b9a4d2-d4e2-4ca1-9aab-1badd9e05fd0) Attack Pattern 1
Execution Guardrails - T1480 (853c4192-4311-43e1-bfbb-b11b14911852) 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
Disk Structure Wipe - T1561.002 (0af0ca99-357d-4ba1-805f-674fdfb7bef9) 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
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 Windows Management Instrumentation - T1047 (01a5a209-b94c-450b-b7f9-946497d91055) Attack Pattern 1
Exfiltration Over C2 Channel - T1041 (92d7da27-2d91-488e-a00c-059dc162766d) 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
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware PowerShell - T1059.001 (970a3432-3237-47ad-bcca-7d8cbb217736) Attack Pattern 1
ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware System Shutdown/Reboot - T1529 (ff73aa03-0090-4464-83ac-f89e233c02bc) Attack Pattern 1
System Network Configuration Discovery - T1016 (707399d6-ab3e-4963-9315-d9d3818cd6a0) Attack Pattern ShrinkLocker - S1178 (3fc44c12-b16e-4de1-8869-cf0eb4446070) Malware 1
Data Destruction - T1485 (d45a3d09-b3cf-48f4-9f0f-f521ee5cb05c) 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
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 Web Protocols - T1071.001 (df8b2a25-8bdf-4856-953c-a04372b1c161) Attack Pattern 1
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 Structure Wipe - T1561.002 (0af0ca99-357d-4ba1-805f-674fdfb7bef9) Attack Pattern Disk Wipe - T1561 (1988cc35-ced8-4dad-b2d1-7628488fa967) 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
File Deletion - T1070.004 (d63a3fb8-9452-4e9d-a60a-54be68d5998c) Attack Pattern Indicator Removal - T1070 (799ace7f-e227-4411-baa0-8868704f2a69) 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