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Merge pull request #9895 from JouniMi/rare_process_as_a_service
Adding a query looking for rare processes as a service
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Hunting Queries/Microsoft 365 Defender/Persistence/Rare-process-as-a-service.yaml
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| id: a60ac80f-dce6-43ec-b102-9ae8c094d5dc | ||
| name: Rare-process-as-a-service | ||
| description: | | ||
| This query is looking for rarely seen processes which are launched as a service. | ||
| Author: Jouni Mikkola | ||
| More info: https://threathunt.blog/rare-process-launch-as-a-service/ | ||
| requiredDataConnectors: | ||
| - connectorId: MicrosoftThreatProtection | ||
| dataTypes: | ||
| - DeviceProcessEvents | ||
| - DeviceNetworkEvents | ||
| - DeviceFileEvents | ||
| - DeviceImageLoadEvents | ||
| tactics: | ||
| - Persistence | ||
| relevantTechniques: | ||
| - T1543 | ||
| - T1543.003 | ||
| query: | | ||
| let LookupTime = 30d; | ||
| let WhiteList = pack_array( | ||
| "svchost.exe", | ||
| "mssense.exe", | ||
| "msmpeng.exe", | ||
| "searchindexer.exe", | ||
| "microsoftedgeupdate.exe" | ||
| ); | ||
| let GetServices = materialize ( | ||
| DeviceProcessEvents | ||
| | where Timestamp > ago(LookupTime) | ||
| | where InitiatingProcessParentFileName contains "services.exe" | ||
| | where InitiatingProcessFileName !in~(WhiteList) | ||
| | project Timestamp, DeviceName, StartedChildProcess = FileName, StartedChildProcessSHA1 = SHA1, StartedChildProcessCmdline = ProcessCommandLine, ServiceProcessSHA1 = InitiatingProcessSHA1, ServiceProcess = InitiatingProcessFileName, ServiceProcessCmdline = InitiatingProcessCommandLine, ServiceProcessID = InitiatingProcessId, ServiceProcessCreationTime = InitiatingProcessCreationTime, ServiceProcessUser = InitiatingProcessAccountName | ||
| ); | ||
| GetServices | ||
| | summarize count() by ServiceProcess, DeviceName | ||
| | where count_ < 6 | ||
| | join kind = inner GetServices on ServiceProcess, DeviceName | ||
| | join kind = leftouter ( | ||
| DeviceNetworkEvents | ||
| | where Timestamp > ago(LookupTime) | ||
| | where InitiatingProcessParentFileName contains "services.exe" | ||
| | where InitiatingProcessFileName !in~(WhiteList) | ||
| | project Timestamp, DeviceName, ServiceProcessSHA1 = InitiatingProcessSHA1, ServiceProcess = InitiatingProcessFileName, ServiceProcessCmdline = InitiatingProcessCommandLine, ServiceProcessID = InitiatingProcessId, ServiceProcessCreationTime = InitiatingProcessCreationTime, ServiceProcessUser = InitiatingProcessAccountName, NetworkAction = ActionType, RemoteIP, RemoteUrl | ||
| ) on DeviceName, ServiceProcess, ServiceProcessCmdline, ServiceProcessCreationTime, ServiceProcessID, ServiceProcessUser, ServiceProcessSHA1 | ||
| | join kind = leftouter ( | ||
| DeviceFileEvents | ||
| | where Timestamp > ago(LookupTime) | ||
| | where InitiatingProcessParentFileName contains "services.exe" | ||
| | where InitiatingProcessFileName !in~(WhiteList) | ||
| | project Timestamp, DeviceName, ServiceProcessSHA1 = InitiatingProcessSHA1, ServiceProcess = InitiatingProcessFileName, ServiceProcessCmdline = InitiatingProcessCommandLine, ServiceProcessID = InitiatingProcessId, ServiceProcessCreationTime = InitiatingProcessCreationTime, ServiceProcessUser = InitiatingProcessAccountName, FileAction = ActionType, ModifiedFile = FileName, ModifiedFileSHA1 = SHA1, ModifiedFilePath = FolderPath | ||
| ) on DeviceName, ServiceProcess, ServiceProcessCmdline, ServiceProcessCreationTime, ServiceProcessID, ServiceProcessUser, ServiceProcessSHA1 | ||
| | join kind = leftouter ( | ||
| DeviceImageLoadEvents | ||
| | where Timestamp > ago(LookupTime) | ||
| | where InitiatingProcessParentFileName contains "services.exe" | ||
| | where InitiatingProcessFileName !in~(WhiteList) | ||
| | project Timestamp, DeviceName, ServiceProcessSHA1 = InitiatingProcessSHA1, ServiceProcess = InitiatingProcessFileName, ServiceProcessCmdline = InitiatingProcessCommandLine, ServiceProcessID = InitiatingProcessId, ServiceProcessCreationTime = InitiatingProcessCreationTime, ServiceProcessUser = InitiatingProcessAccountName, LoadedDLL = FileName, LoadedDLLSHA1 = SHA1, LoadedDLLPath = FolderPath | ||
| ) on DeviceName, ServiceProcess, ServiceProcessCmdline, ServiceProcessCreationTime, ServiceProcessID, ServiceProcessUser, ServiceProcessSHA1 | ||
| | summarize ConnectedAddresses = make_set(RemoteIP), ConnectedUrls = make_set(RemoteUrl), FilesModified = make_set(ModifiedFile),FileModFolderPath = make_set(ModifiedFilePath),FileModHA1s = make_set(ModifiedFileSHA1), ChildProcesses = make_set(StartedChildProcess), ChildCommandlines = make_set(StartedChildProcessCmdline), DLLsLoaded = make_set(LoadedDLL), DLLSHA1 = make_set(LoadedDLLSHA1) by DeviceName, ServiceProcess, ServiceProcessCmdline, ServiceProcessCreationTime, ServiceProcessID, ServiceProcessUser, ServiceProcessSHA1 |