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Detection rules › Sigma

Possible Impacket SecretDump Remote Activity

Status
test
Severity
high
Log source
product windows, service security
Author
Samir Bousseaden, wagga
Source
github.com/SigmaHQ/sigma

Detect AD credential dumping using impacket secretdump HKTL

MITRE ATT&CK coverage

TacticTechniques
Credential Access

Telemetry coverage

ProviderRecord / event type
Security-AuditingEvent ID 5145: A network share object was checked to see whether client can be granted desired access.

Rule body

title: Possible Impacket SecretDump Remote Activity
id: 252902e3-5830-4cf6-bf21-c22083dfd5cf
status: test
description: Detect AD credential dumping using impacket secretdump HKTL
references:
    - https://web.archive.org/web/20230329153811/https://blog.menasec.net/2019/02/threat-huting-10-impacketsecretdump.html
author: Samir Bousseaden, wagga
date: 2019-04-03
modified: 2022-08-11
tags:
    - attack.credential-access
    - attack.t1003.002
    - attack.t1003.004
    - attack.t1003.003
logsource:
    product: windows
    service: security
    definition: 'The advanced audit policy setting "Object Access > Audit Detailed File Share" must be configured for Success/Failure'
detection:
    selection:
        EventID: 5145
        ShareName: '\\\\\*\\ADMIN$'  # looking for the string  \\*\ADMIN$
        RelativeTargetName|contains|all:
            - 'SYSTEM32\'
            - '.tmp'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    EventID: 5145
    ShareName: '\\\\\*\\ADMIN$'
    RelativeTargetName|contains|all:
        - 'SYSTEM32\'
        - '.tmp'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
RelativeTargetNamematch
  • .tmp
  • SYSTEM32\
field:"RelativeTargetName" kind:match
ShareNameeq
  • \\\\\*\\ADMIN$
field:"ShareName" kind:eq value:"\\\\\*\\ADMIN$"