Brute Force T1110

Events covered

22 catalog events are tagged with this technique by at least one rule.

Authoring guide

Patterns shared across the 45 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 (73 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 (154 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 (41 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 6 rules

• External Remote RDP Logon from Public IP
• External Remote SMB Logon from Public IP
• HackTool - CrackMapExec Execution
• HackTool - Hashcat Password Cracker Execution
• HackTool - Hydra Password Bruteforce Execution
• Suspicious Connection to Remote Account

Elastic 3 rules

• Multiple Logon Failure Followed by Logon Success
• Multiple Logon Failure from the same Source Address
• Privileged Accounts Brute Force

Splunk 25 rules

• Detect Password Spray Attack Behavior From Source
• Detect Password Spray Attack Behavior On User
• Detect Password Spray Attempts
• Multiple Failed Network Logon Attempts from Host (Windows Event Log)
• Password Spraying Windows (Windows Event Log)
• RDP Brute-force Detection (Windows Event Log)
• Suspicious Login Failures (Windows Event Log)
• Windows Local Administrator Credential Stuffing
• Windows Multiple Disabled Users Failed To Authenticate Wth Kerberos
• Windows Multiple Invalid Users Fail To Authenticate Using Kerberos
• Windows Multiple Invalid Users Failed To Authenticate Using NTLM
• Windows Multiple Users Fail To Authenticate Wth ExplicitCredentials
• Windows Multiple Users Failed To Authenticate From Host Using NTLM
• Windows Multiple Users Failed To Authenticate From Process
• Windows Multiple Users Failed To Authenticate Using Kerberos
• Windows Multiple Users Remotely Failed To Authenticate From Host
• Windows Remote Desktop Network Bruteforce Attempt
• Windows Unusual Count Of Disabled Users Failed Auth Using Kerberos
• Windows Unusual Count Of Invalid Users Fail To Auth Using Kerberos
• Windows Unusual Count Of Invalid Users Failed To Auth Using NTLM
• Windows Unusual Count Of Users Fail To Auth Wth ExplicitCredentials
• Windows Unusual Count Of Users Failed To Auth Using Kerberos
• Windows Unusual Count Of Users Failed To Authenticate From Process
• Windows Unusual Count Of Users Failed To Authenticate Using NTLM
• Windows Unusual Count Of Users Remotely Failed To Auth From Host

Kusto 8 rules

• Brute force attack against user credentials (Uses Authentication Normalization)
• Excessive Windows Logon Failures
• Failed logon attempts by valid accounts within 10 mins
• Multiple Password Reset by user
• Password Spraying
• Potential Password Spray Attack (Uses Authentication Normalization)
• Remote Desktop Network Brute force (ASIM Network Session schema)
• SecurityEvent - Multiple authentication failures followed by a success

YARA-L 3 rules

• MITRE ATT&CK T1110.001 Windows Repeated Authentication Failures Before Successful One
• MITRE ATT&CK T1110.001 Windows Repeated Authentication Failures Before Successful One With User Entity
• MITRE ATT&CK T1110.003 RW Windows Password Spray