Detection Compromised Cloud Credentials

Ne Zaman Kullanılır

• investigating yaparken alerts about unusual cloud API activity from unfamiliar locations
• building yaparken Tespit rules for credential theft and abuse across cloud environments
• responding yaparken to notifications from cloud providers about exposed credentials
• monitoring yaparken for credential stuffing or brute force attacks against cloud identities
• assessing yaparken the scope of a credential compromise after initial Tespit

Kullanma: for preventing credential compromise (use MFA, credential rotation, and secrets management), for Tespit etme application-level credential theft (use application security monitoring), or for endpoint credential harvesting Tespit (use EDR tools).

Ön Gereksinimler

• AWS GuardDuty enabled across all accounts and regions
• Azure Defender for Identity and Entra ID Protection configured
• GCP Security Command Center with Event Threat Tespit enabled
• CloudTrail, Azure Activity Log, and GCP Audit Log centralized for analysis
• SIEM integration for cross-cloud correlation of credential abuse indicators
• Threat intelligence feeds for known malicious IP ranges

İş Akışı

Adım 1: tespit etme
Credential Compromise Indicators in AWS

Monitor GuardDuty Bul:ings and CloudTrail anomalies that indicate credential abuse.

aws guardduty list-Bul:ings \
  --tespit etme (or)-id $(aws guardduty list-tespit etme (ors) --query 'tespit etme (orIds)[0]' --output text) \
  --Bul:ing-criteria '{
    "Criterion": {
      "type": {
        "Eq": [
          "UnauthorizedAccess:IAMUser/InstanceCredentialExfiltration.OutsideAWS",
          "UnauthorizedAccess:IAMUser/MaliciousIPCaller",
          "UnauthorizedAccess:IAMUser/MaliciousIPCaller.Custom",
          "UnauthorizedAccess:IAMUser/TorIPCaller",
          "UnauthorizedAccess:IAMUser/ConsoleLoginSuccess.B",
          "Recon:IAMUser/MaliciousIPCaller",
          "Recon:IAMUser/MaliciousIPCaller.Custom",
          "InitialAccess:IAMUser/AnomalousBehavior",
          "CredentialAccess:IAMUser/AnomalousBehavior",
          "Persistence:IAMUser/AnomalousBehavior"
        ]
      },
      "service.archived": {"Eq": ["false"]}
    }
  }' --output json

aws logs start-query \
  --log-group-name cloudtrail-logs \
  --start-time $(date -d "7 days ago" +%s) \
  --end-time $(date +%s) \
  --query-string '
    fields @timestamp, userIdentity.userName, sourceIPAddress, responseElements.ConsoleLogin
    | filter eventName = "ConsoleLogin"
    | filter responseElements.ConsoleLogin = "Success"
    | stats count() by userIdentity.userName, sourceIPAddress
    | sort count desc
  '

aws logs start-query \
  --log-group-name cloudtrail-logs \
  --start-time $(date -d "24 hours ago" +%s) \
  --end-time $(date +%s) \
  --query-string '
    fields @timestamp, userIdentity.arn, sourceIPAddress, eventName
    | filter userIdentity.type = "IAMUser"
    | stats earliest(@timestamp) as first_seen, latest(@timestamp) as last_seen,
            count_distinct(sourceIPAddress) as unique_ips by userIdentity.arn
    | filter unique_ips > 3
  '

Adım 2: tespit etme
Credential Abuse in Azure

Monitor Entra ID sign-in logs and Defender for Identity alerts for compromised credentials.

az rest --method GET \
  --url "https://graph.microsoft.com/v1.0/auditLogs/signIns?\$filter=riskLevelDuringSignIn ne 'none' and createdDateTime ge 2026-02-16T00:00:00Z&\$top=50" \
  --query "value[*].{User:userPrincipalName,Risk:riskLevelDuringSignIn,IP:ipAddress,Location:location.city,App:appDisplayName,Status:status.errorCode}" \
  -o table

az rest --method GET \
  --url "https://graph.microsoft.com/v1.0/auditLogs/signIns?\$filter=riskEventTypes_v2/any(r:r eq 'anonymizedIPAddress') and createdDateTime ge 2026-02-22T00:00:00Z" \
  --query "value[*].{User:userPrincipalName,IP:ipAddress,Location:location.city}" \
  -o table

az rest --method GET \
  --url "https://graph.microsoft.com/v1.0/identityProtection/riskyUsers?\$filter=riskLevel eq 'high'" \
  --query "value[*].{User:userPrincipalName,RiskLevel:riskLevel,RiskState:riskState,LastDetected:riskLastUpdatedDateTime}" \
  -o table

az rest --method GET \
  --url "https://graph.microsoft.com/v1.0/auditLogs/directoryAudits?\$filter=activityDisplayName eq 'Consent to application' and activityDateTime ge 2026-02-16T00:00:00Z" \
  --query "value[*].{Activity:activityDisplayName,User:initiatedBy.user.userPrincipalName,App:targetResources[0].displayName}" \
  -o table

Adım 3: tespit etme
Credential Abuse in GCP

Query GCP audit logs and SCC Bul:ings for credential compromise indicators.

gcloud scc Bul:ings list ORG_ID \
  --filter="state=\"ACTIVE\" AND (category=\"ANOMALOUS_CALLER_LOCATION\" OR category=\"SUSPICIOUS_LOGIN\" OR category=\"CREDENTIAL_ACCESS\")" \
  --format="table(Bul:ing.category, Bul:ing.severity, Bul:ing.resourceName, Bul:ing.eventTime)"

gcloud logging read '
  protoPayload.authenticationInfo.principalEmail:*@*.iam.gserviceaccount.com
  AND protoPayload.requestMetadata.callerIp!=("10." OR "172." OR "192.168.")
  AND timestamp>="2026-02-22T00:00:00Z"
' --limit=100 --format="table(timestamp, protoPayload.authenticationInfo.principalEmail, protoPayload.requestMetadata.callerIp, protoPayload.methodName)"

gcloud logging read '
  protoPayload.requestMetadata.callerIp:("185." OR "198." OR "45.")
  AND protoPayload.authenticationInfo.principalEmail:*@company.com
  AND timestamp>="2026-02-22T00:00:00Z"
' --limit=50 --format=json

gcloud logging read '
  protoPayload.methodName="google.iam.admin.v1.CreateServiceAccountKey"
  AND timestamp>="2026-02-16T00:00:00Z"
' --format="table(timestamp, protoPayload.authenticationInfo.principalEmail, protoPayload.request.name)"

Adım 4: Build Cross-Cloud Correlation Rules

Create SIEM rules that correlate credential abuse indicators across cloud providers.

import json
from datetime import datetime, timedelta

def tespit etme (_impossible_travel)(events):
    """tespit etme
same identity used from distant locations in short timeframe."""
    user_events = {}
    for event in events:
        user = event.get('principal', '')
        ip = event.get('source_ip', '')
        ts = event.get('timestamp', '')
        cloud = event.get('cloud_provider', '')

        key = f"{user}_{cloud}"
        if key not in user_events:
            user_events[key] = []
        user_events[key].append({'ip': ip, 'timestamp': ts, 'cloud': cloud})

    alerts = []
    for user_key, accesses in user_events.items():
        accesses.sort(key=lambda x: x['timestamp'])
        for i in range(1, len(accesses)):
            time_diff = (datetime.fromisoformat(accesses[i]['timestamp']) -
                        datetime.fromisoformat(accesses[i-1]['timestamp']))
            if time_diff < timedelta(hours=1) and accesses[i]['ip'] != accesses[i-1]['ip']:
                alerts.append({
                    'type': 'IMPOSSIBLE_TRAVEL',
                    'user': user_key,
                    'ip_1': accesses[i-1]['ip'],
                    'ip_2': accesses[i]['ip'],
                    'time_gap_minutes': time_diff.total_seconds() / 60,
                    'severity': 'HIGH'
                })
    return alerts

def tespit etme (_credential_stuffing)(events, threshold=10):
    """tespit etme
multiple failed logins followed by success."""
    user_attempts = {}
    for event in events:
        user = event.get('principal', '')
        success = event.get('success', False)
        key = user
        if key not in user_attempts:
            user_attempts[key] = {'failures': 0, 'success_after_failures': False}
        if not success:
            user_attempts[key]['failures'] += 1
        elif user_attempts[key]['failures'] >= threshold:
            user_attempts[key]['success_after_failures'] = True

    return [{'user': u, 'failures': d['failures'], 'severity': 'CRITICAL'}
            for u, d in user_attempts.items() if d['success_after_failures']]

Adım 5: Respond to Confirmed Credential Compromise

Execute containment actions when credential compromise is confirmed.

aws iam update-access-key --user-name COMPROMISED_USER \
  --access-key-id AKIA_COMPROMISED --status Inactive

aws iam update-assume-role-policy --role-name COMPROMISED_ROLE \
  --policy-document '{"Version":"2012-10-17","Statement":[{"Effect":"Deny","Principal":"*","Action":"sts:AssumeRole"}]}'

aws iam put-user-policy --user-name COMPROMISED_USER \
  --policy-name RevokeOldSessions \
  --policy-document '{
    "Version":"2012-10-17",
    "Statement":[{
      "Effect":"Deny",
      "Action":"*",
      "Resource":"*",
      "Condition":{"DateLessThan":{"aws:TokenIssueTime":"2026-02-23T10:00:00Z"}}
    }]
  }'

az rest --method POST \
  --url "https://graph.microsoft.com/v1.0/users/COMPROMISED_USER_ID/revokeSignInSessions"

az ad user update --id COMPROMISED_USER_ID --force-change-password-next-sign-in true

gcloud iam service-accounts disable COMPROMISED_SA_EMAIL

gcloud iam service-accounts keys delete KEY_ID --iam-account=COMPROMISED_SA_EMAIL

Key Concepts

Term	Definition
Impossible Travel	Tespit of the same credential being used from geographically distant locations within a time period that makes physical travel impossible
Credential Stuffing	Attack using stolen username/password combinations from data breaches to attempt login across multiple cloud services
Instance Credential Exfiltration	GuardDuty Bul:ing indicating EC2 instance role credentials are being used from outside the expected AWS network
Anomalous Behavior	Machine learning-based Tespit of API call patterns that deviate significantly from the established baseline for a principal
Session Revocation	Invalidating all active authentication sessions for a compromised principal to force re-authentication with new credentials
Persistence Indicator	Attacker actions designed to maintain access after initial compromise, such as creating new access keys or service account keys

Tools & Systems

• AWS GuardDuty: ML-based threat Tespit with specific Bul:ing types for credential compromise and unauthorized access
• Microsoft Entra ID Protection: Identity risk Tespit for sign-in anomalies, compromised credentials, and risky user behavior
• GCP Event Threat Tespit: SCC component Tespit etme anomalous API usage and credential abuse in GCP environments
• CloudTrail / Activity Log / Audit Log: API audit logs providing the raw data for credential compromise investigation
• SIEM (Splunk, Elastic, Sentinel): Centralized platform for cross-cloud correlation of credential abuse indicators

Common Scenarios

Scenario: Tespit etme an Access Key Compromised via Phishing

Context: A developer receives a phishing email that harvests their AWS console credentials. The attacker logs in from a foreign IP, creates a new access key, and begins enumerating the account.

Approach:

1. GuardDuty triggers UnauthorizedAccess:IAMUser/ConsoleLoginSuccess.B for login from unusual country
2. SOC reviews the Bul:ing and correlates with phishing reports from the email security team
3. Query CloudTrail for all actions by the compromised user from the attacker's IP
4. Discover the attacker created new access keys and ran IAM enumeration commands
5. Immediately deactivate all access keys for the user and revoke active sessions
6. Force password reset and re-enroll MFA
7. Check for persistence: new IAM users, roles, Lambda functions, or EC2 instances created
8. Remove any persistence artifacts and Şunu belgele: incident timeline

Pitfalls: Simply changing the password does not invalidate existing access keys or active sessions. All access keys must be rotated and temporary credentials revoked by adding a deny-all policy for tokens issued before the compromise was Detected. Attackers may create new IAM users or roles for persistence before the initial credential is revoked.

Output Format

Cloud Credential Compromise Tespit Report
===============================================
Tespit Date: 2026-02-23
Scope: Multi-cloud (AWS, Azure, GCP)
Period: 2026-02-16 to 2026-02-23

ACTIVE COMPROMISE INDICATORS:
[CRED-001] AWS Console Login from Unusual Location
  User: developer@company.com
  Source IP: 185.x.x.x (Russia)
  Normal Location: US-East
  GuardDuty Bul:ing: UnauthorizedAccess:IAMUser/ConsoleLoginSuccess.B
  Severity: HIGH
  Status: Credential deactivated

[CRED-002] Azure Impossible Travel Tespit
  User: admin@company.onmicrosoft.com
  Location 1: New York, US (09:00 UTC)
  Location 2: Beijing, CN (09:15 UTC)
  Risk Level: HIGH
  Status: Sessions revoked, under investigation

tespit etme (ION) METRICS (Last 7 Days):
  Impossible travel Tespits:        5
  Anomalous API activity alerts:      12
  Failed login attempts > threshold:   3
  New credentials from unusual IPs:    2
  Total compromises confirmed:         2

CONTAINMENT ACTIONS TAKEN:
  AWS access keys deactivated:    3
  Azure sessions revoked:         2
  GCP service accounts disabled:  1
  Passwords force-reset:          4
  MFA re-enrolled:                4

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