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CTE - Compromised Device Suspected (High-Volume IOC Blocks)
Description
A single device is generating an unusually high volume of threat-intel-matched (IOC) blocks in a short window. This pattern is more consistent with malware/beaconing behavior than manual browsing and should be investigated for device compromise. Note: the 5-per-hour threshold below is a starting point based on limited sample data - tune it once a real baseline is established.
- Rule type
- Scheduled
- Version
- 1.0.0
- Query frequency
- 15m
- Query period
- 1h
- 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.
CybereinforceCTE_CL
| where EventType == "block.url"
| extend d = parse_json(Details)
| extend
DeviceId = tostring(d.deviceId),
HostName = iff(isnotempty(tostring(d.hostname)), tostring(d.hostname), strcat("cte-device-", substring(EntityId, 0, 8))),
DeviceUser = tostring(d.deviceUser),
DeviceOs = tostring(d.deviceOs),
DeviceVersion = tostring(d.deviceVersion),
Url = tostring(d.url),
IsIoc = tobool(d.ioc),
ClientIp = tostring(split(tostring(d.clientIp), ":")[0])
| where IsIoc == true
| summarize IOC_BlockCount=count(), SampleUrls=make_set(Url, 20), SampleIps=make_set(ClientIp, 20), FirstSeen=min(TimeGenerated), LastSeen=max(TimeGenerated) by DeviceId, HostName, DeviceUser, DeviceOs, DeviceVersion, TenantId
| where IOC_BlockCount >= 5
| extend Url = tostring(SampleUrls[0]), ClientIp = tostring(SampleIps[0])
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
59246163-4cc0-4e96-a0f0-f098a83cf425
GSTEP / CATALOG TRACKING
Added to catalog : 16 Sept 2026 · 05:49 UTC
Last change observed : 16 Sept 2026 · 05:49 UTC