Detecting Cryptomining In Cloud

# AWS Cost Anomaly Detection
aws ce create-anomaly-monitor \
  --anomaly-monitor '{
    "MonitorName": "EC2CostSpike",
    "MonitorType": "DIMENSIONAL",
    "MonitorDimension": "SERVICE"
  }'

aws ce create-anomaly-subscription \
  --anomaly-subscription '{
    "SubscriptionName": "CryptoMiningAlert",
    "MonitorArnList": ["arn:aws:ce::123456789012:anomalymonitor/monitor-id"],
    "Subscribers": [{"Address": "security@company.com", "Type": "EMAIL"}],
    "Threshold": 50.0,
    "Frequency": "IMMEDIATE"
  }'

# CloudWatch alarm for CPU utilization spike
aws cloudwatch put-metric-alarm \
  --alarm-name HighCPUUtilization \
  --namespace AWS/EC2 \
  --metric-name CPUUtilization \
  --statistic Average \
  --period 300 \
  --threshold 90 \
  --comparison-operator GreaterThanThreshold \
  --evaluation-periods 3 \
  --alarm-actions "arn:aws:sns:us-east-1:123456789012:security-alerts"

# EventBridge rule for cryptocurrency findings
aws events put-rule \
  --name CryptoMiningDetection \
  --event-pattern '{
    "source": ["aws.guardduty"],
    "detail-type": ["GuardDuty Finding"],
    "detail": {
      "type": [
        {"prefix": "CryptoCurrency:"},
        {"prefix": "Impact:EC2/BitcoinTool"},
        {"prefix": "Impact:Runtime/CryptoMiner"}
      ]
    }
  }'

# Auto-remediation Lambda for crypto findings
aws events put-targets \
  --rule CryptoMiningDetection \
  --targets '[{
    "Id": "CryptoAutoRemediate",
    "Arn": "arn:aws:lambda:us-east-1:123456789012:function/crypto-remediate"
  }]'

// Sentinel KQL query for mining pool connections
AzureNetworkAnalytics_CL
| where TimeGenerated > ago(24h)
| where DestPort_d in (3333, 4444, 5555, 8333, 9999, 14444, 14433, 45700)
| summarize ConnectionCount = count(), BytesSent = sum(BytesSent_d)
            by SrcIP_s, DestIP_s, DestPort_d, bin(TimeGenerated, 1h)
| where ConnectionCount > 10
| project TimeGenerated, SrcIP_s, DestIP_s, DestPort_d, ConnectionCount, BytesSent

# AWS Athena query for VPC Flow Logs mining pool detection
cat << 'EOF' > mining-detection.sql
SELECT srcaddr, dstaddr, dstport, protocol,
       COUNT(*) as connection_count,
       SUM(bytes) as total_bytes
FROM vpc_flow_logs
WHERE dstport IN (3333, 4444, 5555, 8333, 9999, 14444)
  AND action = 'ACCEPT'
  AND start >= date_add('hour', -24, now())
GROUP BY srcaddr, dstaddr, dstport, protocol
HAVING COUNT(*) > 10
ORDER BY connection_count DESC
EOF

# Check for recently registered ECS task definitions with suspicious images
aws ecs list-task-definitions --sort DESC --max-items 50 | \
  jq -r '.taskDefinitionArns[]' | while read arn; do
    aws ecs describe-task-definition --task-definition "$arn" \
      --query 'taskDefinition.containerDefinitions[*].[name,image]' --output text
  done

# Known malicious mining images to watch for:
# - Images with high pull counts from unknown registries
# - Images containing xmrig, cpuminer, minergate, or ccminer binaries
# - Images with entrypoint pointing to /tmp/.hidden or /dev/shm paths

# Monitor CloudTrail for suspicious ECS/EKS activity
aws cloudtrail lookup-events \
  --lookup-attributes AttributeKey=EventName,AttributeValue=RegisterTaskDefinition \
  --start-time $(date -d '-24 hours' +%Y-%m-%dT%H:%M:%S) \
  --query 'Events[*].[EventName,Username,EventTime]'

# Auto-remediation Lambda for cryptomining incidents
import boto3
import json

def lambda_handler(event, context):
    finding = event['detail']
    resource_type = finding['resource']['resourceType']

    if resource_type == 'Instance':
        instance_id = finding['resource']['instanceDetails']['instanceId']
        ec2 = boto3.client('ec2')

        # Snapshot EBS volumes for forensics before isolation
        volumes = ec2.describe_instances(InstanceIds=[instance_id])
        for reservation in volumes['Reservations']:
            for instance in reservation['Instances']:
                for vol in instance['BlockDeviceMappings']:
                    volume_id = vol['Ebs']['VolumeId']
                    ec2.create_snapshot(
                        VolumeId=volume_id,
                        Description=f'Forensic snapshot - crypto mining - {instance_id}',
                        TagSpecifications=[{
                            'ResourceType': 'snapshot',
                            'Tags': [{'Key': 'Incident', 'Value': 'CryptoMining'},
                                     {'Key': 'SourceInstance', 'Value': instance_id}]
                        }]
                    )

        # Disable API termination protection if set by attacker
        ec2.modify_instance_attribute(
            InstanceId=instance_id,
            DisableApiTermination={'Value': False}
        )

        # Isolate instance with empty security group
        vpc_id = finding['resource']['instanceDetails']['networkInterfaces'][0]['vpcId']
        isolation_sg = ec2.create_security_group(
            GroupName=f'crypto-isolation-{instance_id}',
            Description='Cryptomining isolation - no traffic allowed',
            VpcId=vpc_id
        )
        # Revoke default egress rule
        ec2.revoke_security_group_egress(
            GroupId=isolation_sg['GroupId'],
            IpPermissions=[{'IpProtocol': '-1', 'IpRanges': [{'CidrIp': '0.0.0.0/0'}]}]
        )
        ec2.modify_instance_attribute(
            InstanceId=instance_id,
            Groups=[isolation_sg['GroupId']]
        )

        return {'status': 'contained', 'instance': instance_id}

# Trace the initial access for the compromised identity
aws cloudtrail lookup-events \
  --lookup-attributes AttributeKey=Username,AttributeValue=compromised-user \
  --start-time 2025-02-01T00:00:00Z \
  --query 'Events[?EventName==`ConsoleLogin` || EventName==`GetSessionToken`].[EventTime,SourceIPAddress,EventName]' \
  --output table

# Check for RunInstances calls in unusual regions
for region in $(aws ec2 describe-regions --query 'Regions[*].RegionName' --output text); do
  count=$(aws cloudtrail lookup-events \
    --region $region \
    --lookup-attributes AttributeKey=EventName,AttributeValue=RunInstances \
    --start-time $(date -d '-7 days' +%Y-%m-%dT%H:%M:%S) \
    --query 'Events | length(@)')
  if [ "$count" -gt 0 ]; then
    echo "Region: $region - RunInstances calls: $count"
  fi
done