Query: Sigma YAML for windows / process_creation
Matching passage: Sigma rule: Detects a suspicious process creation as SYSTEM user (suspicious program or command line parameter). Logsource: windows / process_creation. Rule: title: Suspicious SYSTEM User Process Creation id: 2617e7ed-adb7-40ba-b0f3-8f9945fe6c09 status: test description: Detects a suspicious process creation as SYSTEM user (suspicious program or command line parameter) references: - Internal Research - https://tools.thehacker.recipes/mimikatz/modules author: Florian Roth (Nextron Systems), David ANDRE (additional keywords) date: 2021-12-20 modified: 2025-10-19 tags: - attack.credential-access - attack.privilege-escalation - attack.stealth - attack.t1134 - attack.t1003 - attack.t1027 logsource: category: process_creation product: windows detection: selection: IntegrityLevel: - System - S-1-16-16384 User|contains: - AUTHORI - AUTORI selection_special: - Image|endswith: - \calc.exe - \cscript.exe - \forfiles.exe - \hh.exe - \mshta.exe - \ping.exe - \wscript.exe - CommandLine|re: net\s+user\s+ - CommandLine|contains: - ' -NoP ' - ' -W Hidden ' - ' -decode ' - ' /decode ' - ' /urlcache ' - ' -urlcache ' - ' -e* JAB' - ' -e* SUVYI' - ' -e* SQBFAFgA' - ' -e* aWV4I' - ' -e* IAB' - ' -e* PAA' - ' -e* aQBlAHgA' - vssadmin delete shadows - reg SAVE HKLM - ' -ma ' - Microsoft\Windows\CurrentVersion\Run - .downloadstring( - .downloadfile( - ' /ticket:' - 'dpapi::' - event::clear - event::drop - id::modify - 'kerberos::' - 'lsadump::' - 'misc::' - 'privilege::' - 'rpc::' - 'sekurlsa::' - 'sid::' - 'token::' - vault::cred - vault::list - ' p::d ' - ;iex( - MiniDump filter_main_ping: CommandLine|contains|all: - ping - 127.0.0.1 - ' -n ' filter_vs: Image|endswith: \PING.EXE ParentCommandLine|contains: \DismFoDInstall.cmd filter_config_mgr: ParentImage|contains: :\Packages\Plugins\Microsoft.GuestConfiguration.ConfigurationforWindows\ filter_java: ParentImage|contains: - :\Program Files (x86)\Java\ - :\Program Files\Java\ ParentImage|endswith: \bin\javaws.exe Image|contains: - :\Program Files (x86)\Java\ - :\Program Files\Java\ Image|endswith: \bin\jp2launcher.exe CommandLine|contains: ' -ma ' condition: all of selection* and not 1 of filter_* falsepositives: - Administrative activity - Scripts and administrative tools used in the monitored environment - Monitoring activity level: high
Near-miss passage: Sigma rule: Detects creation of ".vhd"/".vhdx" files by browser processes. Malware can use mountable Virtual Hard Disk ".vhd" files. Logsource: windows / file_event. Rule: title: VHD Image Download Via Browser id: 8468111a-ef07-4654-903b-b863a80bbc95 status: test description: 'Detects creation of ".vhd"/".vhdx" files by browser processes. Malware can use mountable Virtual Hard Disk ".vhd" files to encapsulate payloads and evade security controls. ' references: - https://redcanary.com/blog/intelligence-insights-october-2021/ - https://www.kaspersky.com/blog/lazarus-vhd-ransomware/36559/ - https://securelist.com/lazarus-on-the-hunt-for-big-game/97757/ author: frack113, Christopher Peacock '@securepeacock', SCYTHE '@scythe_io' date: 2021-10-25 modified: 2023-05-05 tags: - attack.resource-development - attack.t1587.001 logsource: category: file_event product: windows detection: selection: Image|endswith: - \brave.exe - \chrome.exe - \firefox.exe - \iexplore.exe - \maxthon.exe - \MicrosoftEdge.exe - \msedge.exe - \msedgewebview2.exe - \opera.exe - \safari.exe - \seamonkey.exe - \vivaldi.exe - \whale.exe TargetFilename|contains: .vhd condition: selection falsepositives: - Legitimate downloads of ".vhd" files would also trigger this level: medium