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Suspicious Execution - Short Program Name

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Suspicious Execution - Short Program Name

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Identifies process execution with a single character process name. This is often done by adversaries while staging or executing temporary utilities.

Rule type: eql

Rule indices:

winlogbeat-*
logs-endpoint.events.*
logs-windows.*

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

Tags:

Elastic
Host
Windows
Threat Detection
Defense Evasion

Version: 6 (version history)

Added (Elastic Stack release): 7.11.0

Last modified (Elastic Stack release): 8.4.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query

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process where event.type in ("start", "process_started") and
length(process.name) > 0 and length(process.name) == 5 and
host.os.name == "Windows" and length(process.pe.original_file_name) >
5