Parsear powershell en Azure Sentinel

Hace tiempo que no subo nada de Azure sentinel, en esta ocasión veremos como parsear los logs de Powershell en Azure Sentinel

En primer lugar agregamos Azure Sentinel > Settings > Workspace Settings > y dentro de la sección de Settings presionamos sobre Agents configuration

Dentro de ahí damos a: Add windows event logs y seleccionamos Microsoft-Windows-PowerShell

Para agregar la funcion tenemos que irnos Azure Sentinel > Logs y ejecutamos la query: (powershell_parser.kql)

let EventData = Event
| where Source == "Microsoft-Windows-PowerShell"
| extend RenderedDescription = tostring(split(RenderedDescription, ":")[0])
| project TimeGenerated,
    Source,
    EventID,
    Computer,
    UserName,
    EventData,
    RenderedDescription
| extend EvData = parse_xml(EventData)
| extend EventDetail = EvData.DataItem.EventData.Data
| project-away EventData,
    EvData;
let POWERSHELL_PIPELINE_4103=() {
let processEvents = EventData
| where EventID == 4103
| extend Lines = split(EventDetail.[0].["#text"], "         ")
| extend Severity = split(Lines.[0], "=").[1]
| extend HostName = split(Lines.[1], "=").[1]
| extend HostVersion = split(Lines.[2], "=").[1]
| extend HostID = split(Lines.[3], "=").[1]
| extend HostApplication = split(Lines.[4], "=").[1]
| extend EngineVersion = split(Lines.[5], "=").[1]
| extend RunspaceID = split(Lines.[6], "=").[1]
| extend PipelineID = split(Lines.[7], "=").[1]
| extend CommandName = split(Lines.[8], "=").[1]
| extend CommandType = split(Lines.[9], "=").[1]
| extend ScriptName = split(Lines.[10], "=").[1]
| extend CommandPath = split(Lines.[11], "=").[1]
| extend SequenceNumber = split(Lines.[12], "=").[1]
| extend User = split(Lines.[13], "=").[1]
| extend ConnectedUser = split(Lines.[14], "=").[1]
| extend ShellID = split(Lines.[15], "=").[1]
| project-away EventDetail, Lines
;
processEvents;
};
let POWERSHELL_REMOTE_COMMAND_4104=() {
let processEvents = EventData
| where EventID == 4104
| extend MessageNumber = EventDetail.[0].["#text"]
| extend MessageTotal = EventDetail.[1].["#text"]
| extend ScriptBlockText = EventDetail.[2].["#text"]
| extend ScriptBlockID = EventDetail.[3].["#text"]
| extend Path = EventDetail.[4].["#text"]
| project-away EventDetail
;
processEvents;
};
(union isfuzzy=true
POWERSHELL_PIPELINE_4103,
POWERSHELL_REMOTE_COMMAND_4104
)
| extend Details = column_ifexists("Details", ""), 
RuleName = column_ifexists("RuleName", ""),
PreviousCreationUtcTime=column_ifexists("PreviousCreationUtcTime", ""),
Hashes = column_ifexists("Hashes", ""),
Hash = column_ifexists("Hash", "")
| project TimeGenerated, 
Source, 
Computer, 
UserName, 
EventID, 
Severity,
HostName,
HostVersion,
HostID,
HostApplication,
EngineVersion,
RunspaceID,
PipelineID,
CommandName,
CommandType,
ScriptName,
CommandPath,
SequenceNumber,
User,
ConnectedUser,
ShellID,
MessageNumber,
MessageTotal,
ScriptBlockText,
ScriptBlockID,
Path

Guardamos como Funcion

:wq!

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