Detection rules › Sigma
Findstr Launching .lnk File
Detects usage of findstr to identify and execute a lnk file as seen within the HHS redirect attack
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Stealth | T1027.003 Obfuscated Files or Information: Steganography, T1036 Masquerading, T1202 Indirect Command Execution |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
Rule body yaml
title: Findstr Launching .lnk File
id: 33339be3-148b-4e16-af56-ad16ec6c7e7b
status: test
description: Detects usage of findstr to identify and execute a lnk file as seen within the HHS redirect attack
references:
- https://www.bleepingcomputer.com/news/security/hhsgov-open-redirect-used-by-coronavirus-phishing-to-spread-malware/
author: Trent Liffick
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
Stages and Predicates
Stage 0: condition
all of selection_*Stage 1: selection_img
selection_img:
- Image|endswith:
- '\find.exe'
- '\findstr.exe'
- OriginalFileName:
- 'FIND.EXE'
- 'FINDSTR.EXE'
Stage 2: selection_cli
selection_cli:
CommandLine|endswith:
- '.lnk'
- '.lnk"'
- ".lnk'"
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.
| Field | Kind | Values |
|---|---|---|
CommandLine | ends_with |
|
Image | ends_with |
|
OriginalFileName | eq |
|