Query: detect Detects changes to the PSFactory COM InProcServer32 registry. This technique was used by RomCom to create persistence st in logs
Matching passage: Sigma rule: Detects changes to the PSFactory COM InProcServer32 registry. This technique was used by RomCom to create persistence st. Logsource: windows / registry_set. Rule: title: Potential PSFactoryBuffer COM Hijacking id: 243380fa-11eb-4141-af92-e14925e77c1b status: test description: Detects changes to the PSFactory COM InProcServer32 registry. This technique was used by RomCom to create persistence storing a malicious DLL. references: - https://blogs.blackberry.com/en/2023/06/romcom-resurfaces-targeting-ukraine - https://strontic.github.io/xcyclopedia/library/clsid_C90250F3-4D7D-4991-9B69-A5C5BC1C2AE6.html - https://www.virustotal.com/gui/file/6d3ab9e729bb03ae8ae3fcd824474c5052a165de6cb4c27334969a542c7b261d/detection - https://www.trendmicro.com/en_us/research/23/e/void-rabisu-s-use-of-romcom-backdoor-shows-a-growing-shift-in-th.html author: BlackBerry Threat Research and Intelligence Team - @Joseliyo_Jstnk date: 2023-06-07 modified: 2023-08-17 tags: - attack.privilege-escalation - attack.persistence - attack.t1546.015 logsource: category: registry_set product: windows detection: selection: TargetObject|endswith: \CLSID\{c90250f3-4d7d-4991-9b69-a5c5bc1c2ae6}\InProcServer32\(Default) filter_main: Details: - '%windir%\System32\ActXPrxy.dll' - C:\Windows\System32\ActXPrxy.dll condition: selection and not filter_main falsepositives: - Unknown level: high
Near-miss passage: Sigma rule: Detects potential DLL sideloading of DLLs that are part of antivirus software suchas McAfee, Symantec...etc. Logsource: windows / image_load. Rule: title: Potential Antivirus Software DLL Sideloading id: 552b6b65-df37-4d3e-a258-f2fc4771ae54 status: test description: Detects potential DLL sideloading of DLLs that are part of antivirus software suchas McAfee, Symantec...etc references: - https://hijacklibs.net/ author: Nasreddine Bencherchali (Nextron Systems), Wietze Beukema (project and research) date: 2022-08-17 modified: 2025-10-07 tags: - attack.persistence - attack.privilege-escalation - attack.execution - attack.stealth - attack.t1574.001 logsource: category: image_load product: windows detection: selection_bitdefender: ImageLoaded|endswith: \log.dll filter_log_dll_bitdefender: ImageLoaded|startswith: - C:\Program Files\Bitdefender Antivirus Free\ - C:\Program Files (x86)\Bitdefender Antivirus Free\ filter_log_dll_dell_sar: Image: C:\Program Files\Dell\SARemediation\audit\TelemetryUtility.exe ImageLoaded: - C:\Program Files\Dell\SARemediation\plugin\log.dll - C:\Program Files\Dell\SARemediation\audit\log.dll filter_log_dll_canon: ImageLoaded|startswith: C:\Program Files\Canon\MyPrinter\ filter_log_dll_avast: ImageLoaded: - C:\Program Files\AVAST Software\Avast\log.dll - C:\Program Files (x86)\AVAST Software\Avast\log.dll filter_log_dll_avg: ImageLoaded: - C:\Program Files\AVG\Antivirus\log.dll - C:\Program Files (x86)\AVG\Antivirus\log.dll selection_fsecure: ImageLoaded|endswith: \qrt.dll filter_fsecure: ImageLoaded|startswith: - C:\Program Files\F-Secure\Anti-Virus\ - C:\Program Files (x86)\F-Secure\Anti-Virus\ selection_mcafee: ImageLoaded|endswith: - \ashldres.dll - \lockdown.dll - \vsodscpl.dll filter_mcafee: ImageLoaded|startswith: - C:\Program Files\McAfee\ - C:\Program Files (x86)\McAfee\ selection_cyberark: ImageLoaded|endswith: \vftrace.dll filter_cyberark: ImageLoaded|startswith: - C:\Program Files\CyberArk\Endpoint Privilege Manager\Agent\x32\ - C:\Program Files (x86)\CyberArk\Endpoint Privilege Manager\Agent\x32\ selection_avast: ImageLoaded|endswith: \wsc.dll filter_wsc_dll_avast: ImageLoaded|startswith: - C:\program Files\AVAST Software\Avast\ - C:\program Files (x86)\AVAST Software\Avast\ filter_wsc_dll_avg: ImageLoaded|startswith: - C:\Program Files\AVG\Antivirus\ - C:\Program Files (x86)\AVG\Antivirus\ selection_eset_deslock: ImageLoaded|endswith: \DLPPREM32.dll filter_eset_deslock: ImageLoaded|startswith: - C:\program Files\ESET - C:\program Files (x86)\ESET selection_titanium: ImageLoaded|endswith: \tmdbglog.dll filter_titanium: ImageLoaded|startswith: - C:\program Files\Trend