Adversary-in-the-Middle: Name Resolution Poisoning and SMB Relay T1557.001
Tactics: Credential Access, Collection
By responding to LLMNR/NBT-NS/mDNS 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
17 catalog events are tagged with this technique by at least one rule.
Authoring guide
Patterns shared across the 28 rules above: which fields they filter on, what specific values they look for, and what they exclude. The catalog normalizes field names 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 (46 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 (185 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. Click a value to expand the rules under this technique that use it.
Exclusions (13 distinct)
Field/operator/value combinations excluded by rules under this technique (top-level not() clauses), sorted by how many rules exclude each. 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. Click a value to expand the rules under this technique that exclude it.
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 12 rules
- Attempts of Kerberos Coercion Via DNS SPN Spoofing
- Discovery for print spooler bug abuse (NTLM hash retrivial) via named pipe
- Exchange server impersonation via PrivExchange relay attack
- HackTool - ADCSPwn Execution
- HackTool - Impacket Tools Execution
- Local Privilege Escalation Indicator TabTip
- Potential PetitPotam Attack Via EFS RPC Calls
- Potential SMB Relay Attack Tool Execution
- RottenPotato Like Attack Pattern
- Suspicious DNS Query Indicating Kerberos Coercion via DNS Object SPN Spoofing
- Suspicious DNS Query Indicating Kerberos Coercion via DNS Object SPN Spoofing - Network
- WinDivert Driver Load
Elastic 8 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 Kerberos SPN Spoofing via Suspicious DNS Query
- Potential Machine Account Relay Attack via SMB
- Potential NTLM Relay Attack against a Computer Account
- Potential PowerShell Pass-the-Hash/Relay Script
Splunk 6 rules
- DNS Kerberos Coercion
- Suspicious Spool Authentication (Windows Event Log)
- Windows Credential Target Information Structure in Commandline
- Windows Kerberos Coercion via DNS
- Windows Short Lived DNS Record
- Windows Theme File Creation in Unusual Location