Query: detection rule: Detects the creation of files with an executable or script extension by an Office application.
Matching passage: Sigma rule: Detects the creation of files with an executable or script extension by an Office application.. Logsource: windows / file_event. Rule: title: File With Uncommon Extension Created By An Office Application id: c7a74c80-ba5a-486e-9974-ab9e682bc5e4 status: test description: Detects the creation of files with an executable or script extension by an Office application. references: - https://thedfirreport.com/2021/03/29/sodinokibi-aka-revil-ransomware/ - https://github.com/vadim-hunter/Detection-Ideas-Rules/blob/02bcbfc2bfb8b4da601bb30de0344ae453aa1afe/Threat%20Intelligence/The%20DFIR%20Report/20210329_Sodinokibi_(aka_REvil)_Ransomware.yaml author: Vadim Khrykov (ThreatIntel), Cyb3rEng (Rule), Nasreddine Bencherchali (Nextron Systems) date: 2021-08-23 modified: 2025-10-17 tags: - attack.t1204.002 - attack.execution logsource: product: windows category: file_event detection: selection1: Image|endswith: - \excel.exe - \msaccess.exe - \mspub.exe - \powerpnt.exe - \visio.exe - \winword.exe selection2: TargetFilename|endswith: - .bat - .cmd - .com - .dll - .exe - .hta - .ocx - .proj - .ps1 - .scf - .scr - .sys - .vbe - .vbs - .wsf - .wsh filter_main_localassembly: TargetFilename|contains: \AppData\Local\assembly\tmp\ TargetFilename|endswith: .dll filter_optional_webservicecache: TargetFilename|contains|all: - C:\Users\ - \AppData\Local\Microsoft\Office\ - \WebServiceCache\AllUsers TargetFilename|endswith: .com filter_optional_webex: Image|endswith: \winword.exe TargetFilename|contains: \AppData\Local\Temp\webexdelta\ TargetFilename|endswith: - .dll - .exe filter_optional_backstageinappnavcache: TargetFilename|contains|all: - C:\Users\ - \AppData\Local\Microsoft\Office\ - \BackstageInAppNavCache\ TargetFilename|endswith: .com condition: all of selection* and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - Unknown level: high
Near-miss passage: Sigma rule: Detects the execution "AccCheckConsole" a command-line tool for verifying the accessibility implementation of an applica. Logsource: windows / process_creation. Rule: title: Potential DLL Injection Via AccCheckConsole id: 0f6da907-5854-4be6-859a-e9958747b0aa status: test description: 'Detects the execution "AccCheckConsole" a command-line tool for verifying the accessibility implementation of an application''s UI. One of the tests that this checker can run are called "verification routine", which tests for things like Consistency, Navigation, etc. The tool allows a user to provide a DLL that can contain a custom "verification routine". An attacker can build such DLLs and pass it via the CLI, which would then be loaded in the context of the "AccCheckConsole" utility. ' references: - https://gist.github.com/bohops/2444129419c8acf837aedda5f0e7f340 - https://twitter.com/bohops/status/1477717351017680899?s=12 - https://lolbas-project.github.io/lolbas/OtherMSBinaries/AccCheckConsole/ author: Florian Roth (Nextron Systems) date: 2022-01-06 modified: 2024-08-29 tags: - attack.execution - detection.threat-hunting logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: \AccCheckConsole.exe - OriginalFileName: AccCheckConsole.exe selection_cli: CommandLine|contains: - ' -hwnd' - ' -process ' - ' -window ' condition: all of selection_* falsepositives: - Legitimate use of the UI Accessibility Checker level: medium