↳ GitHub sourceAnalytics ruleMedium
Failed host logons but success logon to AzureAD
Description
'Identifies a list of IP addresses with a minimum number(default of 5) of failed logon attempts to remote hosts.
Uses that list to identify any successful logons to Microsoft Entra ID from these IPs within the same timeframe.'
- Rule type
- Scheduled
- Version
- 1.1.5
- Query frequency
- 1d
- Query period
- 1d
- Trigger
- gt 0
Declared MITRE coverage
Declared sources
Metadata from the source file. No dependencies inferred from KQL.
Connectors
Data types
KQL query
Original query, unchanged.
//Adjust this threshold to fit environment
let signin_threshold = 5;
//Make a list of IPs with failed Windows host logins above threshold
let win_fails =
SecurityEvent
| where EventID == 4625
| where LogonType in (10, 7, 3)
| where IpAddress != "-"
| summarize count() by IpAddress
| where count_ > signin_threshold
| summarize make_list(IpAddress);
let wef_fails =
WindowsEvent
| where EventID == 4625
| extend LogonType = tostring(EventData.LogonType)
| where LogonType in (10, 7, 3)
| extend IpAddress = tostring(EventData.IpAddress)
| where IpAddress != "-"
| summarize count() by IpAddress
| where count_ > signin_threshold
| summarize make_list(IpAddress);
//Make a list of IPs with failed *nix host logins above threshold
let nix_fails =
Syslog
| where Facility contains 'auth' and ProcessName != 'sudo' and SyslogMessage has 'from' and not(SyslogMessage has_any ('Disconnecting', 'Disconnected', 'Accepted', 'disconnect', @'[preauth]'))
| extend SourceIP = extract("(([0-9]{1,3})\\.([0-9]{1,3})\\.([0-9]{1,3})\\.(([0-9]{1,3})))",1,SyslogMessage)
| where SourceIP != "" and SourceIP != "127.0.0.1"
| summarize count() by SourceIP
| where count_ > signin_threshold
| summarize make_list(SourceIP);
//See if any of the IPs with failed host logins hve had a sucessful Azure AD login
let aadFunc = (tableName:string){
table(tableName)
| where ResultType in ("0", "50125", "50140")
| where IPAddress in (win_fails) or IPAddress in (nix_fails) or IPAddress in (wef_fails)
| extend Reason= "Multiple failed host logins from IP address with successful Azure AD login"
| extend timestamp = TimeGenerated, Type = Type
| extend AccountName = tostring(split(UserPrincipalName, "@")[0]), AccountUPNSuffix = tostring(split(UserPrincipalName, "@")[1])
};
let aadSignin = aadFunc("SigninLogs");
let aadNonInt = aadFunc("AADNonInteractiveUserSignInLogs");
union isfuzzy=true aadSignin, aadNonInt
Declared entities
Related content
Links established from declared identifiers and solution manifests.
Source provenance
GitHubDisplayed values come from files in Azure/Azure-Sentinel. They describe the published template, not your workspace configuration.
- Commit
9800e51↗- Source identifier
1ce5e766-26ab-4616-b7c8-3b33ae321e80
Additional source files 1
Detections/MultipleDataSources/HostAADCorrelation.yamlsource ↗GSTEP / CATALOG TRACKING
Added to catalog : 16 Sept 2026 · 05:49 UTC
Last change observed : 16 Sept 2026 · 05:49 UTC