Steal or Forge Kerberos Tickets: Kerberoasting T1558.003
Tactic: Credential Access
Adversaries may abuse a valid Kerberos ticket-granting ticket (TGT) or sniff network traffic to obtain a ticket-granting service (TGS) ticket that may be vulnerable to Brute Force.
Events covered
19 catalog events are tagged with this technique by at least one rule.
Authoring guide
Patterns shared across the 40 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 (565 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 (83 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 19 rules
- HackTool - KrbRelay Execution
- HackTool - KrbRelayUp Execution
- HackTool - RemoteKrbRelay Execution
- HackTool - Rubeus Execution
- HackTool - Rubeus Execution - ScriptBlock
- Kerberoast ticket request detected
- Kerberoasting Activity - Initial Query
- Kerberos Network Traffic RC4 Ticket Encryption
- No Suitable Encryption Key Found For Generating Kerberos Ticket
- Potential CVE-2021-42278 Exploitation Attempt
- Potential CVE-2021-42287 Exploitation Attempt
- Potential SPN Enumeration Via Setspn.EXE
- Register new Logon Process by Rubeus
- Suspicious Kerberos RC4 Ticket Encryption
- Suspicious Kerberos Ticket Request via CLI
- Suspicious Kerberos Ticket Request via PowerShell Script - ScriptBlock
- Suspicious SPN enumeration previous to Kerberoasting attack (PowerShell)
- Uncommon Outbound Kerberos Connection - Security
- User Couldn't Call a Privileged Service 'LsaRegisterLogonProcess'
Elastic 7 rules
- Kerberos Cached Credentials Dumping
- Kerberos Traffic from Unusual Process
- Potential Kerberos Attack via Bifrost
- Potential PowerShell HackTool Script by Function Names
- PowerShell Kerberos Ticket Request
- Suspicious Kerberos Authentication Ticket Request
- User account exposed to Kerberoasting
Splunk 11 rules
- Kerberoasting spn request with RC4 encryption
- Rubeus Command Line Parameters
- Rubeus Commands (PowerShell)
- Rubeus Commands (Sysmon)
- Rubeus Commands (Windows Event Log)
- ServicePrincipalNames Discovery with PowerShell
- ServicePrincipalNames Discovery with SetSPN
- Unusual Number of Kerberos Service Tickets Requested
- Windows PowerView Kerberos Service Ticket Request
- Windows PowerView SPN Discovery
- Windows Process With NetExec Command Line Parameters