Windows findstr Launches .lnk via Command Line

Flags find.exe or findstr.exe processes whose command lines end with a .lnk file.

FreeReviewedSigma · Medium · v2

Product: windows
Category: process_creation
Author: Trent Liffick (SigmaHQ), DRL 1.1
Published: 2020-05-01
Updated: 2026-07-31

ATT&CK techniques

Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule flags Windows process executions where find.exe or findstr.exe are started and their command line ends with a .lnk reference. An attacker can use living-off-the-land utilities to enumerate and trigger shortcut files, which can lead to follow-on execution. The detection relies on process creation telemetry, specifically the executable image name and the command line ending in a .lnk path or quoted .lnk value.

Reporting behind it

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Windows findstr Launches .lnk via Command Line

Pivot detection · T1036 · 9 related

Changelog

v2
Candidate ingested via manual entry.2026-07-31
v1
No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

windows-process-creation-findstr-used-with-lnk-suffix-to-trigger-shortcut-execut-33339be3

title: Windows findstr Launches .lnk via Command Line
id: 46586365-68ab-4c3a-9081-983bee1b1c27
status: test
description: This rule flags Windows process executions where find.exe or findstr.exe are started and their command line ends with a .lnk reference. An attacker can use living-off-the-land utilities to enumerate and trigger shortcut files, which can lead to follow-on execution. The detection relies on process creation telemetry, specifically the executable image name and the command line ending in a .lnk path or quoted .lnk value.
references:
  - https://www.bleepingcomputer.com/news/security/hhsgov-open-redirect-used-by-coronavirus-phishing-to-spread-malware/
  - https://github.com/SigmaHQ/sigma/blob/master/rules/windows/process_creation/proc_creation_win_findstr_lnk.yml
author: Trent Liffick, Huntrule Team
date: 2020-05-01
modified: 2024-01-15
tags:
  - attack.stealth
  - attack.t1036
  - attack.t1202
  - attack.t1027.003
logsource:
  category: process_creation
  product: windows
detection:
  selection_img:
    - Image|endswith:
        - \find.exe
        - \findstr.exe
    - OriginalFileName:
        - FIND.EXE
        - FINDSTR.EXE
  selection_cli:
    CommandLine|endswith:
      - .lnk
      - .lnk"
      - .lnk'
  condition: all of selection_*
falsepositives:
  - Unknown
level: medium
license: DRL-1.1
related:
  - id: 33339be3-148b-4e16-af56-ad16ec6c7e7b
    type: derived

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