Kerberos Network Traffic RC4 Ticket Encryption

testmedium
log source: zeek · kerberosauthor sigmadate 2020-02-12
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description

What this is, in brief.

Detects kerberos TGS request using RC4 encryption which may be indicative of kerberoasting

02

tags

attack.credential-accessattack.t1558.003
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rule source (YAML)

title: Kerberos Network Traffic RC4 Ticket Encryption
id: 503fe26e-b5f2-4944-a126-eab405cc06e5
status: test
description: Detects kerberos TGS request using RC4 encryption which may be indicative of kerberoasting
references:
    - https://adsecurity.org/?p=3458
author: sigma
date: 2020-02-12
modified: 2021-11-27
tags:
    - attack.credential-access
    - attack.t1558.003
logsource:
    product: zeek
    service: kerberos
detection:
    selection:
        request_type: 'TGS'
        cipher: 'rc4-hmac'
    computer_acct:
        service|startswith: '$'
    condition: selection and not computer_acct
falsepositives:
    - Normal enterprise SPN requests activity
level: medium
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detects techniques (1)

ATT&CK techniques this enables or maps to.

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references

External citations — patches, advisories, analysis.