Detection rules › Splunk
ZeroLogon CVE-2020-1472 (Windows Event Log)
The vulnerability allows an attacker to set a password for the computer account of an Active Directory Domain Controller, which can then be abused to pull credentials from the Domain Controller
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Privilege Escalation | T1068 Exploitation for Privilege Escalation |
| Lateral Movement | T1210 Exploitation of Remote Services |
References
Event coverage
| Provider | Event | Title |
|---|---|---|
| Security-Auditing | Event ID 4742 | A computer account was changed. |
Rule body yaml
id: '5366.5480'
title: ZeroLogon CVE-2020-1472
description: 'The vulnerability allows an attacker to set a password for the computer
account of an Active Directory Domain Controller, which can then be abused to pull
credentials from the Domain Controller. -- Threat Actor Association: APT15, APT29/Nobelium/Cozy
Bear - Software Association: BianLian, BlackSuit, Bumblebee Loader, Cuba, LockBit,
Qbot/Qakbot - #TrendingThreat #Russia #Ukraine'
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_winevent` ((TERM(EventCode=4742) OR
"<EventID>4742<") "NT AUTHORITY" "ANONYMOUS LOGON")| regex host="(?i)dc" | rex field=_raw
"(?i)Changed:\s+Security ID:\s+(?<dest_host>[\S]+)" | table _time, host, user signature_id,
member_nt_domain, user, dest_host | bin span=1s | stats values(*) as * by _time,
host '
techniques:
- privilege-escalation:exploitation for privilege escalation
- lateral-movement:exploitation of remote services
technique_id:
- T1068
- T1210
data_category:
- Windows event logs
references:
- https://www.secura.com/pathtoimg.php?id=2055
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1472
Stages and Predicates
Stage 1: search
`get_endpoint_data` `get_endpoint_data_winevent` ((TERM(EventCode=4742) OR "<EventID>4742<") "NT AUTHORITY" "ANONYMOUS LOGON")
Stage 2: regex
| regex host="(?i)dc"
Stage 3: rex
| rex field=_raw "(?i)Changed:\s+Security ID:\s+(?<dest_host>[\S]+)"
Stage 4: table
| table _time, host, user signature_id, member_nt_domain, user, dest_host
Stage 5: bucket
| bin span=1s
Stage 6: stats
| stats values(*) as * by _time, host
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.
Search terms
Bare-string tokens in the SPL search body. Splunk matches each token against _raw (the untyped raw event text) anywhere it appears, not against a specific field. These don't surface in the Indicators table because they aren't predicates on a known field.
| Stage | Term |
|---|---|
| 1 | TERM |
| 1 | "<EventID>4742<" |
| 1 | "NT AUTHORITY" |
| 1 | "ANONYMOUS LOGON" |