Persistence (TA0003)(external, opens in a new tab or window)
Defense Evasion (TA0005)(external, opens in a new tab or window)
text code block:library where host.os.type == "windows" and process.executable : ("?:\\Windows\\System32\\svchost.exe", "?:\\Windows\\Syswow64\\svchost.exe") and dll.code_signature.trusted != true and not dll.code_signature.status : ("trusted", "errorExpired", "errorCode_endpoint*") and dll.hash.sha256 != null and ( /* DLL created within 5 minutes of the library load event - compatible with Elastic Endpoint 8.4+ */ dll.Ext.relative_file_creation_time <= 300 or /* unusual paths */ dll.path :("?:\\ProgramData\\*", "?:\\Users\\*", "?:\\PerfLogs\\*", "?:\\Windows\\Tasks\\*", "?:\\Intel\\*", "?:\\AMD\\Temp\\*", "?:\\Windows\\AppReadiness\\*", "?:\\Windows\\ServiceState\\*", "?:\\Windows\\security\\*", "?:\\Windows\\IdentityCRL\\*", "?:\\Windows\\Branding\\*", "?:\\Windows\\csc\\*", "?:\\Windows\\DigitalLocker\\*", "?:\\Windows\\en-US\\*", "?:\\Windows\\wlansvc\\*", "?:\\Windows\\Prefetch\\*", "?:\\Windows\\Fonts\\*", "?:\\Windows\\diagnostics\\*", "?:\\Windows\\TAPI\\*", "?:\\Windows\\INF\\*", "?:\\Windows\\System32\\Speech\\*", "?:\\windows\\tracing\\*", "?:\\windows\\IME\\*", "?:\\Windows\\Performance\\*", "?:\\windows\\intel\\*", "?:\\windows\\ms\\*", "?:\\Windows\\dot3svc\\*", "?:\\Windows\\panther\\*", "?:\\Windows\\RemotePackages\\*", "?:\\Windows\\OCR\\*", "?:\\Windows\\appcompat\\*", "?:\\Windows\\apppatch\\*", "?:\\Windows\\addins\\*", "?:\\Windows\\Setup\\*", "?:\\Windows\\Help\\*", "?:\\Windows\\SKB\\*", "?:\\Windows\\Vss\\*", "?:\\Windows\\servicing\\*", "?:\\Windows\\CbsTemp\\*", "?:\\Windows\\Logs\\*", "?:\\Windows\\WaaS\\*", "?:\\Windows\\twain_32\\*", "?:\\Windows\\ShellExperiences\\*", "?:\\Windows\\ShellComponents\\*", "?:\\Windows\\PLA\\*", "?:\\Windows\\Migration\\*", "?:\\Windows\\debug\\*", "?:\\Windows\\Cursors\\*", "?:\\Windows\\Containers\\*", "?:\\Windows\\Boot\\*", "?:\\Windows\\bcastdvr\\*", "?:\\Windows\\TextInput\\*", "?:\\Windows\\security\\*", "?:\\Windows\\schemas\\*", "?:\\Windows\\SchCache\\*", "?:\\Windows\\Resources\\*", "?:\\Windows\\rescache\\*", "?:\\Windows\\Provisioning\\*", "?:\\Windows\\PrintDialog\\*", "?:\\Windows\\PolicyDefinitions\\*", "?:\\Windows\\media\\*", "?:\\Windows\\Globalization\\*", "?:\\Windows\\L2Schemas\\*", "?:\\Windows\\LiveKernelReports\\*", "?:\\Windows\\ModemLogs\\*", "?:\\Windows\\ImmersiveControlPanel\\*", "?:\\$Recycle.Bin\\*") ) and not dll.hash.sha256 : ("3ed33e71641645367442e65dca6dab0d326b22b48ef9a4c2a2488e67383aa9a6", "b4db053f6032964df1b254ac44cb995ffaeb4f3ade09597670aba4f172cf65e4", "214c75f678bc596bbe667a3b520aaaf09a0e50c364a28ac738a02f867a085eba", "23aa95b637a1bf6188b386c21c4e87967ede80242327c55447a5bb70d9439244", "5050b025909e81ae5481db37beb807a80c52fc6dd30c8aa47c9f7841e2a31be7")
Install detection rules in Elastic Security
Detect Unsigned DLL Loaded by Svchost in the Elastic Security detection engine by installing this rule into your Elastic Stack.
To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).