MedCore Systems — S3 Bucket Exposure
INCIDENT REPORT
A severely misconfigured AWS S3 bucket belonging to MedCore Systems was found completely exposed to public internet traffic. The bucket lacked fundamental authentication mechanisms, allowing arbitrary reading and listing of its contents.
Security researchers identified the data leak over a period of 72 hours before attempting responsible disclosure. The compromised repository contained deeply sensitive Personally Identifiable Information (PII) mapped to user healthcare accounts and financial transaction histories.
Further forensics suggest that an automated threat actor script extracted approximately 4.2 million files before the bucket was secured by the cloud provider.
EXPOSED DATA TYPES
RAW LOG EXTRACTION [TRUNCATED]
// TACTIC: EXFIL OVER C2 (T1048.003)
{"timestamp": "2024-11-14T02:14:55Z", "src_ip": "104.28.XX.XX", "action": "GetObject", "resource": "arn:aws:s3:::medcore-prod/user_data/batch_092.csv"}
{"timestamp": "2024-11-14T02:14:56Z", "src_ip": "104.28.XX.XX", "action": "GetObject", "resource": "arn:aws:s3:::medcore-prod/user_data/batch_093.csv"}
{"timestamp": "2024-11-14T02:14:58Z", "src_ip": "104.28.XX.XX", "action": "GetObject", "resource": "arn:aws:s3:::medcore-prod/user_data/batch_094.csv"}
[SYSTEM_WARNING: MALICIOUS PATTERN DETECTED // BULK EXTRACTION NO AUTH]
{"timestamp": "2024-11-14T02:15:01Z", "src_ip": "104.28.XX.XX", "action": "ListBucket", "resource": "arn:aws:s3:::medcore-prod"}
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