Remote Task Creation via ATSVC Named Pipe

Status: test
Severity: medium
Log source: product windows, service security
Author: Samir Bousseaden
Source: github.com/SigmaHQ/sigma

Detects remote task creation via at.exe or API interacting with ATSVC namedpipe

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1053.002` Scheduled Task/Job: At
Persistence	`T1053.002` Scheduled Task/Job: At
Privilege Escalation	`T1053.002` Scheduled Task/Job: At

Telemetry coverage

Provider	Record / event type
Security-Auditing	Event ID 5145: A network share object was checked to see whether client can be granted desired access.

Rule body

title: Remote Task Creation via ATSVC Named Pipe
id: f6de6525-4509-495a-8a82-1f8b0ed73a00
status: test
description: Detects remote task creation via at.exe or API interacting with ATSVC namedpipe
references:
    - https://web.archive.org/web/20230409194125/https://blog.menasec.net/2019/03/threat-hunting-25-scheduled-tasks-for.html
author: Samir Bousseaden
date: 2019-04-03
modified: 2024-08-01
tags:
    - attack.privilege-escalation
    - attack.execution
    - attack.lateral-movement
    - attack.persistence
    - car.2013-05-004
    - car.2015-04-001
    - attack.t1053.002
logsource:
    product: windows
    service: security
    definition: 'The advanced audit policy setting "Object Access > Audit Detailed File Share" must be configured for Success/Failure'
detection:
    selection:
        EventID: 5145
        ShareName: '\\\\\*\\IPC$' # looking for the string \\*\IPC$
        RelativeTargetName: atsvc
        AccessList|contains: 'WriteData'
    condition: selection
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    EventID: 5145
    ShareName: '\\\\\*\\IPC$'
    RelativeTargetName: atsvc
    AccessList|contains: 'WriteData'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`AccessList`	match	`WriteData` corpus 4 (sigma 4)	`field:"AccessList" kind:match value:"WriteData"`
`RelativeTargetName`	eq	`atsvc` corpus 4 (sigma 3, kusto 1)	`field:"RelativeTargetName" kind:eq value:"atsvc"`
`ShareName`	eq	`\\\\\*\\IPC$` corpus 7 (sigma 7)	`field:"ShareName" kind:eq value:"\\\\\*\\IPC$"`

Remote Task Creation via ATSVC Named Pipe

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection

Indicators

Stage 0: `condition`

Stage 1: `selection`