# T1111 - Multi-Factor Authentication Interception

## SOC Recommendation
Investigate Multi-Factor Authentication Interception activity in the context of Credential Access: confirm scope, affected host/identity, and whether it matches expected administrative behaviour before deciding this is benign.

## D3FEND Mappings
| D3FEND Technique | Relationship | Practical SOC Action |
|---|---|---|
| Radiation Hardening | Harden | Apply Radiation Hardening to reduce this technique's viability before an incident occurs. |
| Hardware Component Inventory | Model | Use Hardware Component Inventory to establish a baseline that makes this technique's deviations easier to spot. |

## Investigation Steps
1. Review Defender for Endpoint / Defender XDR alerts and timeline for the affected host or identity.
2. Check Sentinel analytics rules and incidents correlated with this technique.
3. Review Entra ID sign-in and audit logs if the technique involves an identity or cloud resource.

## Evidence to Collect
- Host or resource affected
- Account or identity involved
- Timestamp of the activity
- Related process, file, or network artifact
- Any preceding or follow-on alerts

## Response Actions
| Action | Risk | Automation Safe | Approval Required |
|---|---|---|---|
| Contain the affected host or account | Medium | No | Yes |
| Collect and preserve evidence | Low | Yes | No |

## KQL
```kql
GWorkspaceActivityReports 
| where EventMessage =~ 'TURN_OFF_2_STEP_VERIFICATION'
| extend AccountCustomEntity = ActorEmail
```
```kql
let time_threshold = 10m;
let RiskySignins = materialize (SigninLogs
| where TimeGenerated > ago(1d)
| where ResultType == 0
| where RiskLevelDuringSignIn =~ "high" or RiskLevelAggregated =~ "high"
| extend SignInTime = TimeGenerated, Name=split(UserPrincipalName, "@")[0], UPNSuffix=split(UserPrincipalName, "@")[1]);
let ips = todynamic(toscalar(RiskySignins | summarize make_list(IPAddress)));
RiskySignins
| join kind=inner (_Im_WebSession(starttime=ago(1d), ipaddr_has_any_prefix=ips, eventresult="Success", pack=True))
on $left.IPAddress == $right.DstIpAddr
| where EventStartTime < TimeGenerated
| extend TimeDelta = TimeGenerated - EventStartTime
| where TimeDelta <= time_threshold
| extend NetworkEventStartTime = EventStartTime, NetworkEventEndTime = EventEndTime
| extend SrcUsername = column_ifexists("SrcUsername", "Unknown")
| project-reorder SignInTime, UserPrincipalName, IPAddress, AppDisplayName, ClientAppUsed, DeviceDetail, LocationDetails, NetworkLocationDetails, RiskEventTypes, UserAgent, NetworkEventStartTime, NetworkEventEndTime, SrcIpAddr, DstIpAddr, DstPortNumber, Dvc, DvcHostname, SrcBytes, NetworkProtocol, SrcUsername
```

## Escalation Criteria
- Multi-Factor Authentication Interception activity observed on a privileged account or critical system.
- Activity follows or precedes other suspicious behaviour in the same investigation.
- Automated triage cannot confidently rule out malicious intent.

## False Positive Considerations
- Legitimate administrative or maintenance activity matching this pattern.
- Approved security testing or red team exercise.
- Known benign software producing similar telemetry.

Generated by SOC Response Atlas by Basyrix.