Detection rules › Kusto
Cisco WSA - Multiple infected files
'Detects multiple infected files on same source.'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access |
Rule body
id: 93186e3d-5dc2-4a00-a993-fa1448db8734
name: Cisco WSA - Multiple infected files
description: |
'Detects multiple infected files on same source.'
severity: High
status: Available
requiredDataConnectors:
- connectorId: SyslogAma
datatypes:
- Syslog
queryFrequency: 1h
queryPeriod: 1h
triggerOperator: gt
triggerThreshold: 0
tactics:
- InitialAccess
relevantTechniques:
- T1189
query: |
CiscoWSAEvent
| where isnotempty(AmpFileName)
| where isnotempty(ThreatName)
| summarize count() by SrcIpAddr, SrcUserName, bin(TimeGenerated, 15m)
| where count_ > 1
| extend IPCustomEntity = SrcIpAddr, AccountCustomEntity = SrcUserName
entityMappings:
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IPCustomEntity
- entityType: Account
fieldMappings:
- identifier: Name
columnName: AccountCustomEntity
version: 1.0.3
kind: Scheduled
Stages and Predicates
Stage 1: source
CiscoWSAEvent
Stage 2: where
| where isnotempty(AmpFileName)
Stage 3: where
| where isnotempty(ThreatName)
Stage 4: summarize
| summarize count() by SrcIpAddr, SrcUserName, bin(TimeGenerated, 15m)
Stage 5: where
| where count_ > 1
Stage 6: extend
| extend IPCustomEntity = SrcIpAddr, AccountCustomEntity = SrcUserName
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
AmpFileName | is_not_null | field:"AmpFileName" kind:is_not_null | |
ThreatName | is_not_null | field:"ThreatName" kind:is_not_null | |
count_ | gt |
| field:"count_" kind:gt value:"1" |
Output fields
These fields are emitted when the rule matches.
| Field | Source |
|---|---|
SrcIpAddr | summarize |
SrcUserName | summarize |
AccountCustomEntity | extend |
IPCustomEntity | extend |