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Detection rules › Sigma

Unsigned Image Loaded Into LSASS Process

Status
test
Severity
medium
Log source
product windows, category image_load
Author
Teymur Kheirkhabarov, oscd.community
Source
github.com/SigmaHQ/sigma

Loading unsigned image (DLL, EXE) into LSASS process

MITRE ATT&CK coverage

TacticTechniques
Credential AccessT1003.001 OS Credential Dumping: LSASS Memory

Event coverage

ProviderEventTitle
SysmonEvent ID 7Image loaded

Rule body yaml

title: Unsigned Image Loaded Into LSASS Process
id: 857c8db3-c89b-42fb-882b-f681c7cf4da2
status: test
description: Loading unsigned image (DLL, EXE) into LSASS process
references:
    - https://www.slideshare.net/heirhabarov/hunting-for-credentials-dumping-in-windows-environment
author: Teymur Kheirkhabarov, oscd.community
date: 2019-10-22
modified: 2021-11-27
tags:
    - attack.credential-access
    - attack.t1003.001
logsource:
    category: image_load
    product: windows
detection:
    selection:
        Image|endswith: '\lsass.exe'
        Signed: 'false'
    condition: selection
falsepositives:
    - Valid user connecting using RDP
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    Image|endswith: '\lsass.exe'
    Signed: 'false'

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
  • \lsass.exe corpus 5 (sigma 5)
Signedeq
  • false corpus 9 (splunk 5, sigma 4)