Query: rule covering Detects BitLocker Access Agent Update Utility (baaupdate.exe) loading DLLs from suspicious locations that are publicly w
Matching passage: Sigma rule: Detects BitLocker Access Agent Update Utility (baaupdate.exe) loading DLLs from suspicious locations that are publicly w. Logsource: windows / image_load. Rule: title: BaaUpdate.exe Suspicious DLL Load id: 6e8fe0a8-ba0b-4a93-8f9e-82657e7a5984 related: - id: 9f38c1db-e2ae-40bf-81d0-5b68f73fb512 type: similar status: experimental description: 'Detects BitLocker Access Agent Update Utility (baaupdate.exe) loading DLLs from suspicious locations that are publicly writable which could indicate an attempt to lateral movement via BitLocker DCOM & COM Hijacking. This technique abuses COM Classes configured as INTERACTIVE USER to spawn processes in the context of the logged-on user''s session. Specifically, it targets the BDEUILauncher Class (CLSID ab93b6f1-be76-4185-a488-a9001b105b94) which can launch BaaUpdate.exe, which is vulnerable to COM Hijacking when started with input parameters. This allows attackers to execute code in the user''s context without needing to steal credentials or use additional techniques to compromise the account. ' references: - https://github.com/rtecCyberSec/BitlockMove author: Swachchhanda Shrawan Poudel (Nextron Systems) date: 2025-10-18 tags: - attack.stealth - attack.t1218 - attack.lateral-movement - attack.t1021.003 logsource: category: image_load product: windows detection: selection: Image|endswith: \BaaUpdate.exe ImageLoaded|endswith: .dll ImageLoaded|contains: - :\Perflogs\ - :\Users\Default\ - :\Users\Public\ - :\Windows\Temp\ - \AppData\Local\Temp\ - \AppData\Roaming\ - \Contacts\ - \Favorites\ - \Favourites\ - \Links\ - \Music\ - \Pictures\ - \ProgramData\ - \Temporary Internet - \Videos\ condition: selection falsepositives: - Unknown level: high
Near-miss 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: