Malware in the recycle bin (Normalized Process Events)

id: 61988db3-0565-49b5-b8e3-747195baac6e
name: Malware in the recycle bin (Normalized Process Events)
description: |
  'Identifies malware that has been hidden in the recycle bin.
  To use this analytics rule, make sure you have deployed the [ASIM normalization parsers](https://aka.ms/ASimProcessEvent)'
severity: Medium
requiredDataConnectors: []
queryFrequency: 1d
queryPeriod: 1d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - DefenseEvasion
relevantTechniques:
  - T1564
tags:
  - Id: b8266f81-2715-41a6-9062-42486cbc9c73
    version: 1.0.0
  - Schema: ASIMProcessEvent
    SchemaVersion: 0.1.0

query: |
  let procList = dynamic(["cmd.exe","ftp.exe","schtasks.exe","powershell.exe","rundll32.exe","regsvr32.exe","msiexec.exe"]);  
  imProcessCreate
  | where CommandLine has "recycler"
  | where Process has_any (procList)
  | extend FileName = tostring(split(Process, '\\')[-1])
  | where FileName in~ (procList)
  | project TimeGenerated, Dvc, User, Process, FileName, CommandLine, ActingProcessName, EventVendor, EventProduct
  | extend AccountName = tostring(split(User, @'\')[1]), AccountNTDomain = tostring(split(User, @'\')[0])
  | extend HostName = tostring(split(Dvc, ".")[0]), DomainIndex = toint(indexof(Dvc, '.'))
  | extend HostNameDomain = iff(DomainIndex != -1, substring(Dvc, DomainIndex + 1), Dvc)
  | project-away DomainIndex
entityMappings:
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: User
      - identifier: Name
        columnName: AccountName
      - identifier: NTDomain
        columnName: AccountNTDomain
  - entityType: Host
    fieldMappings:
      - identifier: FullName
        columnName: Dvc
      - identifier: HostName
        columnName: HostName
      - identifier: DnsDomain
        columnName: HostNameDomain
version: 1.2.5
kind: Scheduled
metadata:
    source:
        kind: Community
    author:
        name: Yuval Naor
    support:
        tier: Community
    categories:
        domains: [ "Security - Threat Protection" ]