Suspicious named pipes

let timeframe=1h;
let CobaltStrikeDefaults= dynamic([@"msagent_", @"MSSE-", @"postex_", @"status_", @"mypipe-f", @"mypipe-h",@"ntsvcs_",@"scerpc_", @"mojo.5688.8052."]);
let CobaltStrikeMallable= dynamic([@"win_svc", @"ntsvcs", @"scerpc", @"status_", @"SearchTextHarvester", @"DserNamePipe",@"wkssvc_",@"scerpc_", @"spoolss_",@"CatalogChangeListener",@"fullduplex_",@"demoagent_",@"PGMessagePipe",@"MsFteWds",@"postex_ssh_",@"windows.update.manager",@"\f4c3",@"\f53f",@"halfduplex_"]);
DeviceEvents
| where Timestamp >= ago(timeframe)
| where ActionType == "NamedPipeEvent"
| extend AdditionalFields=parse_json(AdditionalFields)
| extend ThreadId=tostring(AdditionalFields.ThreadId)
| extend PipeName=tostring(AdditionalFields.PipeName)
// creating string based variants of the processIDs for matching several times later
| extend InitiatingPID=tostring(InitiatingProcessId)
| extend InitiatingParentPID=tostring(InitiatingProcessParentId)
// Begin allow-list.
// End allow-list.
| where PipeName has_any (CobaltStrikeDefaults) or
// Mojo is generated by Chrome(ium) browsers and teams and have distinct pattern including the (parent)ProcessId and ThreadId plus a random character string, CobaltStrike generates hex.
      (PipeName matches regex @"\\mojo\.\d+\.\d+\." and not(PipeName matches regex @"\\mojo\.\d+\.\d+\.\d+$" or PipeName has InitiatingPID or PipeName has InitiatingParentPID or PipeName has ThreadId)) or
// Chrome(ium) browsers sync processes have distinct pattern including the (parent)ProcessId and ThreadId plus a random character string, CobaltStrike generates hex.
      (PipeName matches regex @"\\(edge|chrome)\.sync\.\d+\.\d+\." and not(PipeName matches regex @"\\(edge|chrome|edge\.sync|chrome\.sync)\.\d+\.\d+\.\d+$" or PipeName has InitiatingPID or PipeName has InitiatingParentPID or PipeName has ThreadId)) or
// PSHost is generated by PowerShell and has a distinct pattern including the (parent)ProcessId.
      (PipeName matches regex @"\\PSHost\.\d+\." and not(PipeName matches regex @"\\PSHost\.\d+\.\d+\." or PipeName has InitiatingPID or PipeName has InitiatingParentPID)) or
// Crashpad pipes have a distinct pattern including the ProcessId and a string of upper case characters.
      (PipeName matches regex @"\\crashpad_" and not(PipeName matches regex @"\\crashpad_\d+_[A-Z]+" or PipeName has InitiatingPID or PipeName has InitiatingParentPID)) or
// Firefox pipes have a distinct pattern including the ProcessId and 1-3 digits which are sequential for each new pipe.
      (PipeName matches regex @"\\cubeb-pipe-" and not(PipeName matches regex @"\\cubeb-pipe-\d+_[0-9]{1-3}+" or PipeName has InitiatingPID)) or
// Based on a list of public mallable profiles and a suffix that is a random HEX string.
      (PipeName has_any (CobaltStrikeMallable) and PipeName matches regex @"[a-fA-F0-9]{2,10}$") or
      (PipeName matches regex @"\\pipe\\[0-9a-f]{7,10}" or PipeName matches regex @"\\pipe\\[0-9a-f]{8}")

description: |
    This query looks for Named Pipe events that either contain one of the known IOCs or make use of patterns that can be linked to CobaltStrike usage.
kind: Scheduled
tactics:
- Execution
- DefenseEvasion
requiredDataConnectors:
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - DeviceEvents
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/FalconFriday/Analytic Rules/SuspiciousNamedPipes.yaml
severity: Medium
name: Suspicious named pipes
triggerThreshold: 0
queryPeriod: 1h
query: |
  let timeframe=1h;
  let CobaltStrikeDefaults= dynamic([@"msagent_", @"MSSE-", @"postex_", @"status_", @"mypipe-f", @"mypipe-h",@"ntsvcs_",@"scerpc_", @"mojo.5688.8052."]);
  let CobaltStrikeMallable= dynamic([@"win_svc", @"ntsvcs", @"scerpc", @"status_", @"SearchTextHarvester", @"DserNamePipe",@"wkssvc_",@"scerpc_", @"spoolss_",@"CatalogChangeListener",@"fullduplex_",@"demoagent_",@"PGMessagePipe",@"MsFteWds",@"postex_ssh_",@"windows.update.manager",@"\f4c3",@"\f53f",@"halfduplex_"]);
  DeviceEvents
  | where Timestamp >= ago(timeframe)
  | where ActionType == "NamedPipeEvent"
  | extend AdditionalFields=parse_json(AdditionalFields)
  | extend ThreadId=tostring(AdditionalFields.ThreadId)
  | extend PipeName=tostring(AdditionalFields.PipeName)
  // creating string based variants of the processIDs for matching several times later
  | extend InitiatingPID=tostring(InitiatingProcessId)
  | extend InitiatingParentPID=tostring(InitiatingProcessParentId)
  // Begin allow-list.
  // End allow-list.
  | where PipeName has_any (CobaltStrikeDefaults) or
  // Mojo is generated by Chrome(ium) browsers and teams and have distinct pattern including the (parent)ProcessId and ThreadId plus a random character string, CobaltStrike generates hex.
        (PipeName matches regex @"\\mojo\.\d+\.\d+\." and not(PipeName matches regex @"\\mojo\.\d+\.\d+\.\d+$" or PipeName has InitiatingPID or PipeName has InitiatingParentPID or PipeName has ThreadId)) or
  // Chrome(ium) browsers sync processes have distinct pattern including the (parent)ProcessId and ThreadId plus a random character string, CobaltStrike generates hex.
        (PipeName matches regex @"\\(edge|chrome)\.sync\.\d+\.\d+\." and not(PipeName matches regex @"\\(edge|chrome|edge\.sync|chrome\.sync)\.\d+\.\d+\.\d+$" or PipeName has InitiatingPID or PipeName has InitiatingParentPID or PipeName has ThreadId)) or
  // PSHost is generated by PowerShell and has a distinct pattern including the (parent)ProcessId.
        (PipeName matches regex @"\\PSHost\.\d+\." and not(PipeName matches regex @"\\PSHost\.\d+\.\d+\." or PipeName has InitiatingPID or PipeName has InitiatingParentPID)) or
  // Crashpad pipes have a distinct pattern including the ProcessId and a string of upper case characters.
        (PipeName matches regex @"\\crashpad_" and not(PipeName matches regex @"\\crashpad_\d+_[A-Z]+" or PipeName has InitiatingPID or PipeName has InitiatingParentPID)) or
  // Firefox pipes have a distinct pattern including the ProcessId and 1-3 digits which are sequential for each new pipe.
        (PipeName matches regex @"\\cubeb-pipe-" and not(PipeName matches regex @"\\cubeb-pipe-\d+_[0-9]{1-3}+" or PipeName has InitiatingPID)) or
  // Based on a list of public mallable profiles and a suffix that is a random HEX string.
        (PipeName has_any (CobaltStrikeMallable) and PipeName matches regex @"[a-fA-F0-9]{2,10}$") or
        (PipeName matches regex @"\\pipe\\[0-9a-f]{7,10}" or PipeName matches regex @"\\pipe\\[0-9a-f]{8}")  
relevantTechniques:
- T1559
- T1055
id: ddf7c669-db26-4215-acaf-11e2953a04e6
queryFrequency: 1h
status: Available
triggerOperator: gt
version: 1.0.0
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountSid
    identifier: Sid
  - columnName: AccountName
    identifier: Name
  - columnName: AccountDomain
    identifier: NTDomain
- entityType: Host
  fieldMappings:
  - columnName: DeviceName
    identifier: FullName
- entityType: Process
  fieldMappings:
  - columnName: ProcessCommandLine
    identifier: CommandLine