Query: alert when Detects suspicious execution of rundll32, with specific calls to some DLLs with known LOLBIN functionalities
Matching passage: Sigma rule: Detects suspicious execution of rundll32, with specific calls to some DLLs with known LOLBIN functionalities. Logsource: windows / process_creation. Rule: title: Potentially Suspicious Rundll32 Activity id: e593cf51-88db-4ee1-b920-37e89012a3c9 status: test description: Detects suspicious execution of rundll32, with specific calls to some DLLs with known LOLBIN functionalities references: - http://www.hexacorn.com/blog/2017/05/01/running-programs-via-proxy-jumping-on-a-edr-bypass-trampoline/ - https://twitter.com/Hexacorn/status/885258886428725250 - https://gist.github.com/ryhanson/227229866af52e2d963cf941af135a52 - https://twitter.com/nas_bench/status/1433344116071583746 - https://twitter.com/eral4m/status/1479106975967240209 - https://twitter.com/eral4m/status/1479080793003671557 author: juju4, Jonhnathan Ribeiro, oscd.community, Nasreddine Bencherchali (Nextron Systems) date: 2019-01-16 modified: 2023-05-17 tags: - attack.stealth - attack.t1218.011 logsource: category: process_creation product: windows detection: selection: - CommandLine|contains|all: - 'javascript:' - .RegisterXLL - CommandLine|contains|all: - url.dll - OpenURL - CommandLine|contains|all: - url.dll - OpenURLA - CommandLine|contains|all: - url.dll - FileProtocolHandler - CommandLine|contains|all: - zipfldr.dll - RouteTheCall - CommandLine|contains|all: - shell32.dll - Control_RunDLL - CommandLine|contains|all: - shell32.dll - ShellExec_RunDLL - CommandLine|contains|all: - mshtml.dll - PrintHTML - CommandLine|contains|all: - advpack.dll - LaunchINFSection - CommandLine|contains|all: - advpack.dll - RegisterOCX - CommandLine|contains|all: - ieadvpack.dll - LaunchINFSection - CommandLine|contains|all: - ieadvpack.dll - RegisterOCX - CommandLine|contains|all: - ieframe.dll - OpenURL - CommandLine|contains|all: - shdocvw.dll - OpenURL - CommandLine|contains|all: - syssetup.dll - SetupInfObjectInstallAction - CommandLine|contains|all: - setupapi.dll - InstallHinfSection - CommandLine|contains|all: - pcwutl.dll - LaunchApplication - CommandLine|contains|all: - dfshim.dll - ShOpenVerbApplication - CommandLine|contains|all: - dfshim.dll - ShOpenVerbShortcut - CommandLine|contains|all: - scrobj.dll - GenerateTypeLib - http - CommandLine|contains|all: - shimgvw.dll - ImageView_Fullscreen - http - CommandLine|contains|all: - comsvcs.dll - MiniDump filter_main_screensaver: CommandLine|contains: shell32.dll,Control_RunDLL desk.cpl,screensaver,@screensaver filter_main_parent_cpl: ParentImage: C:\Windows\System32\control.exe ParentCommandLine|contains: .cpl CommandLine|contains|all: - Shell32.dll - Control_RunDLL - .cpl filter_main_startmenu: ParentImage:
Near-miss passage: Sigma rule: Detects Windows executables that write files with suspicious extensions. Logsource: windows / file_event. Rule: title: Windows Binaries Write Suspicious Extensions id: b8fd0e93-ff58-4cbd-8f48-1c114e342e62 related: - id: 1277f594-a7d1-4f28-a2d3-73af5cbeab43 type: derived status: test description: Detects Windows executables that write files with suspicious extensions references: - Internal Research author: Nasreddine Bencherchali (Nextron Systems) date: 2022-08-12 modified: 2025-10-07 tags: - attack.stealth - attack.t1036 logsource: category: file_event product: windows detection: selection_generic: Image|endswith: - \csrss.exe - \lsass.exe - \RuntimeBroker.exe - \sihost.exe - \smss.exe - \wininit.exe - \winlogon.exe TargetFilename|endswith: - .bat - .dll - .exe - .hta - .iso - .ps1 - .txt - .vbe - .vbs selection_special: Image|endswith: - \dllhost.exe - \rundll32.exe - \svchost.exe TargetFilename|endswith: - .bat - .hta - .iso - .ps1 - .vbe - .vbs filter_main_AppLockerPolicyTest: Image: C:\Windows\System32\dllhost.exe TargetFilename|contains|all: - :\Users\ - \AppData\Local\Temp\__PSScriptPolicyTest_ TargetFilename|endswith: .ps1 filter_main_script_gpo_machine: Image: C:\Windows\system32\svchost.exe TargetFilename|contains|all: - C:\Windows\System32\GroupPolicy\DataStore\ - \sysvol\ - \Policies\ - \Machine\Scripts\Startup\ TargetFilename|endswith: - .ps1 - .bat filter_main_clipchamp: Image: C:\Windows\system32\svchost.exe TargetFilename|contains|all: - C:\Program Files\WindowsApps\Clipchamp - .ps1 filter_main_powershell_preview: Image: - C:\Windows\system32\svchost.exe - C:\Windows\SysWOW64\svchost.exe TargetFilename|startswith: - C:\Program Files\WindowsApps\Microsoft.PowerShellPreview - C:\Program Files (x86)\WindowsApps\Microsoft.PowerShellPreview TargetFilename|endswith: .ps1 condition: 1 of selection_* and not 1 of filter_main_* falsepositives: - Unknown level: high