Techniques › T1557.001 › AN1274
AN1274 Analytic 1274
Windows · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Detects anomalous network traffic on UDP 5355 (LLMNR) and UDP 137 (NBT-NS) combined with unauthorized SMB relay attempts, registry modifications re-enabling multicast name resolution, or suspicious service creation indicative of adversary-in-the-middle credential interception.</p>
- Detects
- T1557.001 Name Resolution Poisoning and SMB Relay
- Part of
- DET0462 Detect LLMNR/NBT-NS Poisoning and SMB Relay on Windows
Log sources and channels
Exactly as MITRE states them in x_mitre_log_source_references. Where a channel is vague, it is vague in the source; kevmap does not tidy it.
| Log source | Channel | Data component |
|---|---|---|
| WinEventLog:Security | EventCode=4697 | DC0060 Service Creation |
| WinEventLog:Security | Registry key modification HKLM\Software\Policies\Microsoft\Windows NT\DNSClient\EnableMulticast | DC0063 Windows Registry Key Modification |
| NSM:Flow | Unusual responses to LLMNR (UDP 5355) or NBT-NS (UDP 137) queries from unauthorized hosts | DC0085 Network Traffic Content |
| NSM:Flow | Abnormal SMB authentication attempts correlated with poisoned LLMNR/NBT-NS sessions | DC0078 Network Traffic Flow |
Mutable elements
Parameters MITRE marks as environment-specific. These are the knobs you are expected to tune; they are why an analytic is not a rule.
| Field | Description |
|---|---|
TrustedResponderList | Defines expected LLMNR/NBT-NS responders to tune out legitimate services. |
TimeWindow | Correlation period for linking poisoned name resolution with SMB relay attempts. |
SMBServiceBaseline | Normal services and SMB relay patterns in the enterprise environment. |
KEV CVEs whose mapped technique this analytic detects
| CVE | Vendor / product | State |
|---|---|---|
| CVE-2023-38035 | Ivanti Sentry | Mapped |