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Detection rules › Sigma

Remote Schedule Task Lateral Movement via ATSvc

Status
test
Severity
high
Log source
product rpc_firewall, category application
Author
Sagie Dulce, Dekel Paz
Source
github.com/SigmaHQ/sigma

Detects remote RPC calls to create or execute a scheduled task via ATSvc

MITRE ATT&CK coverage

TacticTechniques
ExecutionT1053.002 Scheduled Task/Job: At
PersistenceT1053.002 Scheduled Task/Job: At
Privilege EscalationT1053.002 Scheduled Task/Job: At

Rule body yaml

title: Remote Schedule Task Lateral Movement via ATSvc
id: 0fcd1c79-4eeb-4746-aba9-1b458f7a79cb
status: test
description: Detects remote RPC calls to create or execute a scheduled task via ATSvc
references:
    - https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-tsch/d1058a28-7e02-4948-8b8d-4a347fa64931
    - https://github.com/jsecurity101/MSRPC-to-ATTACK/blob/ddd4608fe8684fcf2fcf9b48c5f0b3c28097f8a3/documents/MS-TSCH.md
    - https://github.com/zeronetworks/rpcfirewall
    - https://zeronetworks.com/blog/stopping-lateral-movement-via-the-rpc-firewall/
author: Sagie Dulce, Dekel Paz
date: 2022-01-01
tags:
    - attack.privilege-escalation
    - attack.lateral-movement
    - attack.execution
    - attack.persistence
    - attack.t1053
    - attack.t1053.002
logsource:
    product: rpc_firewall
    category: application
    definition: 'Requirements: install and apply the RPC Firewall to all processes with "audit:true action:block uuid:1ff70682-0a51-30e8-076d-740be8cee98b"'
detection:
    selection:
        EventLog: RPCFW
        EventID: 3
        InterfaceUuid: 1ff70682-0a51-30e8-076d-740be8cee98b
        OpNum:
            - 0
            - 1
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    EventLog: RPCFW
    EventID: 3
    InterfaceUuid: 1ff70682-0a51-30e8-076d-740be8cee98b
    OpNum:
        - 0
        - 1

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
EventLogeq
  • RPCFW
InterfaceUuideq
  • 1ff70682-0a51-30e8-076d-740be8cee98b
OpNumeq
  • 0
  • 1