1200KM / sigma-rule
WhoAmI as Parameter — Sigma Rule
Sigma rule e9142d84-fbe0-401d-ac50-3e519fb00c89. WhoAmI as Parameter — Sigma Rule. Detects a suspicious process command line that uses whoami as first parameter (as e.g. used by EfsPotato)
Rule metadata and linked tags
Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2021-11-29 / 2022-12-25.
{
"category": "process_creation",
"product": "windows"
}Pinned original Sigma rule · Detection Rule License 1.1
Source SHA-256: f1a2ec7ccf346470771611b7e2fd9fc142c4b2082ae3f4e36a4e968ddf5c03ea
Detection logic
Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.
title: WhoAmI as Parameter
id: e9142d84-fbe0-401d-ac50-3e519fb00c89
status: test
description: Detects a suspicious process command line that uses whoami as first parameter (as e.g. used by EfsPotato)
references:
- https://twitter.com/blackarrowsec/status/1463805700602224645?s=12
author: Florian Roth (Nextron Systems)
date: 2021-11-29
modified: 2022-12-25
tags:
- attack.discovery
- attack.t1033
- car.2016-03-001
logsource:
category: process_creation
product: windows
detection:
selection:
CommandLine|contains: '.exe whoami'
condition: selection
falsepositives:
- Unknown
level: high
False positives
- Unknown
Source references
Connected ecosystem references
Exact source-tagged techniques
Telemetry review
Read the original logsource above, then inspect the linked detection workspaces for technique-level sensor context. No per-rule telemetry equivalence is inferred.
Pinned research references. No browser attack runner, live simulation result or validated detector is asserted. Source mappings and validation limits are preserved. ATT&CK / Atomic provenance · Detection provenance.