# T1090 - Proxy

## SOC Recommendation
Investigate Proxy activity in the context of Command and Control: 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 |
|---|---|---|
| User Geolocation Logon Pattern Analysis | Detect | Monitor for User Geolocation Logon Pattern Analysis indicators relevant to this technique. |
| Network Traffic Filtering | Isolate | Apply Network Traffic Filtering to contain the blast radius once this technique is observed. |

## 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
let timeframe = 24h;
BitSightGraphData
| where ingestion_time() > ago(timeframe)and toint(RatingDifferance) < 0
| extend percentage = -(toreal(RatingDifferance)/toreal(Rating))*100
| where percentage >= 10
| project RatingDate, Rating, CompanyName, percentage
```
```kql
let timeframe = 24h;
BitSightGraphData
| where ingestion_time() > ago(timeframe)
| where toint(RatingDifferance) < 0
| project RatingDate, Rating, CompanyName, RatingDifferance
```
```kql
// High Severity - Malicious Domain/IP Reputation Detected
let timeFrame = 5m;
CyfirmaASDomainIPReputationAlerts_CL
| where severity == 'Critical' and TimeGenerated between (ago(timeFrame) .. now())
| extend
    FirstSeen=first_seen,
    LastSeen=last_seen,
    RiskScore=risk_score,
    Domain=sub_domain,
    TopDomain=top_domain,
    NetworkIP=ip,
    AlertUID=alert_uid,
    UID=uid,
    Categories=categories,
    IPversion=ip_version,
    ISP=isp,
    ThreatActors=threat_actors,
    Country=country,
    LastUsersReported=last_users_reported,
    ProviderName='CYFIRMA',
    ProductName='DeCYFIR/DeTCT'
| project
    TimeGenerated,
    Domain,
    TopDomain,
    RiskScore,
    FirstSeen,
    LastSeen,
    NetworkIP,
    AlertUID,
    UID,
    Categories,
    IPversion,
    ISP,
    ThreatActors,
    Country,
    LastUsersReported,
    ProviderName,
    ProductName
```

## Escalation Criteria
- Proxy 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.