{"id":"c11aecef-9c37-45a6-9c07-bc0782f963fd","title":"RunMRU Registry Key Deletion","description":"Detects deletion of the RunMRU registry key, which stores the history of commands executed via the Run dialog.\nIn the clickfix techniques, the phishing lures instruct users to open a run dialog through (Win + R) and execute malicious commands.\nAdversaries may delete this key to cover their tracks after executing commands.\n","author":"Swachchhanda Shrawan Poudel (Nextron Systems)","status":"experimental","level":"high","date":"2025-09-25","modified":"","tags":["attack.stealth","attack.t1070.003"],"technique_ids":["T1070.003"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://www.zscaler.com/blogs/security-research/coldriver-updates-arsenal-baitswitch-and-simplefix"],"source_path":"rules/windows/process_creation/proc_creation_win_reg_delete_runmru.yml","source_sha256":"47eff2586d7a86a277c2b144639cf9b3d2dee4d37ddf76f5857dae29c62bf496","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_reg_delete_runmru.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: RunMRU Registry Key Deletion\nid: c11aecef-9c37-45a6-9c07-bc0782f963fd\nrelated:\n    - id: 3a9b8c1e-5b2e-4f7a-9d1c-2a7f3b6e1c55\n      type: similar\nstatus: experimental\ndescription: |\n    Detects deletion of the RunMRU registry key, which stores the history of commands executed via the Run dialog.\n    In the clickfix techniques, the phishing lures instruct users to open a run dialog through (Win + R) and execute malicious commands.\n    Adversaries may delete this key to cover their tracks after executing commands.\nreferences:\n    - https://www.zscaler.com/blogs/security-research/coldriver-updates-arsenal-baitswitch-and-simplefix\nauthor: Swachchhanda Shrawan Poudel (Nextron Systems)\ndate: 2025-09-25\ntags:\n    - attack.stealth\n    - attack.t1070.003\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection_img:\n        - Image|endswith: '\\reg.exe'\n        - OriginalFileName: 'reg.exe'\n    selection_cli:\n        CommandLine|contains|all:\n            - ' del'\n            - '\\Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\RunMRU'\n    condition: all of selection_*\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1070.003","id":"T1070.003","name":"Clear Command History","page":"techniques/enterprise/T1070.003/"}],"data_path":"data/detection-rules/c11aecef-9c37-45a6-9c07-bc0782f963fd.json","kind":"sigma"}