{"id":"af4c4609-5755-42fe-8075-4effb49f5d44","title":"Microsoft Excel Add-In Loaded From Uncommon Location","description":"Detects Microsoft Excel loading an Add-In (.xll) file from an uncommon location","author":"Nasreddine Bencherchali (Nextron Systems)","status":"test","level":"medium","date":"2023-05-12","modified":"","tags":["attack.execution","attack.t1204.002"],"technique_ids":["T1204.002"],"logsource":{"category":"image_load","product":"windows"},"falsepositives":["Some tuning might be required to allow or remove certain locations used by the rule if you consider them as safe locations"],"references":["https://www.mandiant.com/resources/blog/lnk-between-browsers","https://wazuh.com/blog/detecting-xll-files-used-for-dropping-fin7-jssloader-with-wazuh/"],"source_path":"rules/windows/image_load/image_load_office_excel_xll_susp_load.yml","source_sha256":"8f40a6c1ebb47898df2449cde054e97b9d040e351d69a2207f1823b5072f1806","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/image_load/image_load_office_excel_xll_susp_load.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Microsoft Excel Add-In Loaded From Uncommon Location\nid: af4c4609-5755-42fe-8075-4effb49f5d44\nrelated:\n    - id: c5f4b5cb-4c25-4249-ba91-aa03626e3185\n      type: derived\nstatus: test\ndescription: Detects Microsoft Excel loading an Add-In (.xll) file from an uncommon location\nreferences:\n    - https://www.mandiant.com/resources/blog/lnk-between-browsers\n    - https://wazuh.com/blog/detecting-xll-files-used-for-dropping-fin7-jssloader-with-wazuh/\nauthor: Nasreddine Bencherchali (Nextron Systems)\ndate: 2023-05-12\ntags:\n    - attack.execution\n    - attack.t1204.002\nlogsource:\n    category: image_load\n    product: windows\ndetection:\n    selection:\n        Image|endswith: '\\excel.exe'\n        ImageLoaded|contains:\n            # Note: Add or remove locations from this list based on your internal policy\n            - '\\Desktop\\'\n            - '\\Downloads\\'\n            - '\\Perflogs\\'\n            - '\\Temp\\'\n            - '\\Users\\Public\\'\n            - '\\Windows\\Tasks\\'\n        ImageLoaded|endswith: '.xll'\n    condition: selection\nfalsepositives:\n    - Some tuning might be required to allow or remove certain locations used by the rule if you consider them as safe locations\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1204.002","id":"T1204.002","name":"Malicious File","page":"techniques/enterprise/T1204.002/"}],"data_path":"data/detection-rules/af4c4609-5755-42fe-8075-4effb49f5d44.json","kind":"sigma"}