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Detection rules › Sigma

Potential LethalHTA Technique Execution

Status
test
Severity
high
Log source
product windows, category process_creation
Author
Markus Neis
Source
github.com/SigmaHQ/sigma

Detects potential LethalHTA technique where the "mshta.exe" is spawned by an "svchost.exe" process

MITRE ATT&CK coverage

TacticTechniques
StealthT1218.005 System Binary Proxy Execution: Mshta

Event coverage

ProviderEventTitle
SysmonEvent ID 1Process creation
Security-AuditingEvent ID 4688A new process has been created.

Rule body yaml

title: Potential LethalHTA Technique Execution
id: ed5d72a6-f8f4-479d-ba79-02f6a80d7471
status: test
description: Detects potential LethalHTA technique where the "mshta.exe" is spawned by an "svchost.exe" process
references:
    - https://codewhitesec.blogspot.com/2018/07/lethalhta.html
author: Markus Neis
date: 2018-06-07
modified: 2023-02-07
tags:
    - attack.stealth
    - attack.t1218.005
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\svchost.exe'
        Image|endswith: '\mshta.exe'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    ParentImage|endswith: '\svchost.exe'
    Image|endswith: '\mshta.exe'

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.

FieldKindValues
Imageends_with
  • \mshta.exe corpus 67 (sigma 67)
ParentImageends_with
  • \svchost.exe corpus 14 (sigma 14)