ATT&CK coverage › Technique
Adversary-in-the-Middle: LLMNR/NBT-NS Poisoning and SMB Relay T1557.001
By responding to LLMNR/NBT-NS network traffic, adversaries may spoof an authoritative source for name resolution to force communication with an adversary controlled system. This activity may be used to collect or relay authentication materials.
Events covered
11 catalog events are tagged with this technique by at least one rule.
Authoring guide
Patterns shared across the 19 rules above: which fields they filter on, what specific values they look for, and what they exclude. Field names are normalized across vendors so Sigma's Image, Elastic's process.name, and Splunk's process_name collapse into one row. Each rule contributes at most once per row.
Fields filtered most (26 distinct)
The fields most rules look at when detecting this technique. The How column shows the operators authors use (eq, wildcard, regex_match, match) and how often each appears. Sample values are concrete examples to start from, not an exhaustive list.
Top indicator values (143 distinct)
Specific (field, operator, value) combinations the rules check for, ranked by how many rules under this technique use each one. The Corpus reach column counts how many rules across the entire catalog (any technique) check the same combination. High numbers point to widely-used indicators that are likely noisy on their own; combine them with another condition for useful signal. Blank means the combination is specific to rules under this technique.
Common exclusions (1 distinct)
Field/operator/value combinations that rules under this technique routinely exclude (top-level not() clauses). These are the false-positive paths the community has learned to filter out. A new rule that ignores the high-count entries here will likely fire on the same noisy paths.
Rules under this technique
Every rule in the catalog tagged with this technique, grouped by vendor. Click a rule title for its full predicates, exclusions, and indicators.
Sigma 8 rules
- Attempts of Kerberos Coercion Via DNS SPN Spoofing
- HackTool - ADCSPwn Execution
- HackTool - Impacket Tools Execution
- Local Privilege Escalation Indicator TabTip
- Potential SMB Relay Attack Tool Execution
- RottenPotato Like Attack Pattern
- Suspicious DNS Query Indicating Kerberos Coercion via DNS Object SPN Spoofing
- WinDivert Driver Load
Elastic 6 rules
- Creation of a DNS-Named Record
- Potential Computer Account NTLM Relay Activity
- Potential Kerberos Coercion via DNS-Based SPN Spoofing
- Potential Kerberos Relay Attack against a Computer Account
- Potential Machine Account Relay Attack via SMB
- Potential NTLM Relay Attack against a Computer Account
Splunk 4 rules
- DNS Kerberos Coercion
- Windows Credential Target Information Structure in Commandline
- Windows Kerberos Coercion via DNS
- Windows Short Lived DNS Record