Rare Process as a Service

Requête originale, sans modification.

let LookupTime = 14d;
let WhiteList = pack_array(
"svchost.exe",
"mssense.exe",
"msmpeng.exe",
"searchindexer.exe",
"microsoftedgeupdate.exe"
);
let GetServices = materialize (
DeviceProcessEvents
| where TimeGenerated > ago(LookupTime)
| where InitiatingProcessParentFileName contains "services.exe"
| where InitiatingProcessFileName !in~(WhiteList)
| project TimeGenerated, 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 TimeGenerated > ago(LookupTime)
| where InitiatingProcessParentFileName contains "services.exe"
| where InitiatingProcessFileName !in~(WhiteList)
| project TimeGenerated, 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 TimeGenerated > ago(LookupTime)
| where InitiatingProcessParentFileName contains "services.exe"
| where InitiatingProcessFileName !in~(WhiteList)
| project TimeGenerated, 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 TimeGenerated > ago(LookupTime)
| where InitiatingProcessParentFileName contains "services.exe"
| where InitiatingProcessFileName !in~(WhiteList)
| project TimeGenerated, 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, 100000), ConnectedUrls = make_set(RemoteUrl, 100000), FilesModified = make_set(ModifiedFile, 100000),FileModFolderPath = make_set(ModifiedFilePath, 100000),FileModHA1s = make_set(ModifiedFileSHA1, 100000), ChildProcesses = make_set(StartedChildProcess, 100000), ChildCommandlines = make_set(StartedChildProcessCmdline, 100000), DLLsLoaded = make_set(LoadedDLL, 100000), DLLSHA1 = make_set(LoadedDLLSHA1, 100000) by DeviceName, ServiceProcess, ServiceProcessCmdline, ServiceProcessCreationTime, ServiceProcessID, ServiceProcessUser, ServiceProcessSHA1
| extend HostName = iff(DeviceName has '.', substring(DeviceName, 0, indexof(DeviceName, '.')), DeviceName)
| extend DnsDomain = iff(DeviceName has '.', substring(DeviceName, indexof(DeviceName, '.') + 1), "")