Suspicious NTLM Network Logon From Attacker Controlled Workstation Names (via security)

ATT&CK techniques

Initial Access → Cred Access

Recon
Resource Dev
Initial Access
- T1078Valid Accounts
Execution
Persistence
- T1078Valid Accounts
- T1556Modify Authentication Process
Priv Esc
- T1078Valid Accounts
Defense Evasion
- T1078Valid Accounts
- T1556Modify Authentication Process
Cred Access
- T1556Modify Authentication Process
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects successful NTLM network logons (Event 4624, logon type 3) originating from the workstation names DESKTOP-KRLUI3J and KALI. Rapid7 observed these workstation names during active exploitation of the SonicWall SMA1000 zero days CVE-2026-15409 and CVE-2026-15410 where the actor pivoted from the compromised appliance into the internal network. Kali-branded and attacker-named hosts authenticating over NTLM indicate lateral movement using stolen or bypassed credentials.

Reporting behind it

Related detections9 linkedT1078 — drag to rearrange

Suspicious dMSA Object Access with Migration AccessMask

Suspicious New MFA Authenticator Registration via Azure AD (via azure)

Suspicious Weakening of Certificate Binding Enforcement via Registry (via registry_set)

Malicious ESX Admins Group Added to Privileged Directory Group

Malicious ESX Admins Group Creation via WinRM Host

Suspicious BrightMetricAgent Remote Tool Execution Associated With Volt Typhoon

Suspicious SmarterMail Force Password Reset API Request Indicating Account Takeover

Suspicious Mailbox Forwarding Rule Creation Following AiTM Phishing

Suspicious Salesforce OAuth Refresh Token Use by Klue Battlecards App

Suspicious NTLM Network Logon From Attacker Controlled Workstation Names (via security)

Pivot detection · T1078 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

Full detection rule

Unlock this rule to view and copy it

The detection logic is included with a plan. Everything else — context, mappings and implementation details — stays free on this page.

Sign in for 3 free unlocks

Signing in gives you 3 unlocks to spend on any rule in the library. No card, and they do not expire.

Also included

Unlocked rules convert on this page — to Splunk SPL or Splunk — Raw Index SPL or Microsoft Sentinel KQL or Microsoft Sentinel ASIM ASIM KQL or Microsoft Defender XDR KQL or Elastic Security KQL or Elastic Security Lucene or Elastic Security ES|QL or CrowdStrike Falcon CQL or SentinelOne PowerQuery or Palo Alto Cortex XDR XQL or Carbon Black Cloud Platform Search or Carbon Black EDR Process Search or Google Security Operations UDM Search or IBM QRadar AQL or Sumo Logic Cloud SIEM Rules expression or Rapid7 InsightIDR LEQL or Graylog Search or OpenSearch Lucene or OpenSearch PPL PPL or Grafana Loki LogQL or SQLite SQL or Zircolite SQLite — with the log-source profile the engine picked, the field map it used, and everything it could not express. Converting a rule you have unlocked costs no further credit.

See it run on a free rule →Convert your own rule →