Full Report
2025-01-13 • Halcyon • Halcyon Research Team Open article on Malpedia
Analysis Summary
The provided article description is extremely brief and primarily serves as a citation/inventory link rather than a detailed content summary. Therefore, the resulting summary will be speculative based on the title and limited context.
# Tool/Technique: Abusing AWS Native Services: Ransomware Encrypting S3 Buckets with SSE-C
## Overview
This entry describes a technique or capability involving ransomware utilizing Amazon Web Services (AWS) native services, specifically targeting S3 buckets for encryption using the Server-Side Encryption with Customer-Provided Keys (SSE-C) mechanism.
## Technical Details
- Type: Technique / Ransomware Operation Method
- Platform: AWS Cloud Environment (specifically S3)
- Capabilities: Encryption of data stored in S3 buckets using customer-supplied keys (SSE-C), leading to potential data unavailability for the victim.
- First Seen: Information not available from the provided context snippet.
## MITRE ATT&CK Mapping
(Specific mappings are not available, but the activity suggests the following high-level tactics):
- [TA0011 - Collection] (If data is exfiltrated prior to encryption)
- [TA0040 - Impact]
- [T1486 - Data Encrypted for Impact] (Focus on the encryption action)
- [T1565 - Data Manipulation] (Applicable to altering data state via encryption)
## Functionality
### Core Capabilities
- Leveraging AWS S3 API calls to interact with storage.
- Implementation of data encryption using the SSE-C standard, requiring the attacker to manage/supply the encryption keys, which they control if they compromise the necessary AWS credentials.
### Advanced Features
- Abusing native cloud features (SSE-C) as an attack vector, potentially bypassing traditional perimeter security controls focused on network ingress/egress.
## Indicators of Compromise
- File Hashes: N/A (Focus is on cloud API interaction, not traditional binaries)
- File Names: N/A
- Registry Keys: N/A
- Network Indicators: Interactions with AWS S3 API endpoints (e.g., `s3.[region].amazonaws.com`).
- Behavioral Indicators:
- High volume of S3 `PutObject` or `CopyObject` operations utilizing SSE-C headers.
- Changes in S3 object metadata indicating encryption policy changes.
## Associated Threat Actors
- Threat actors specializing in cloud resource abuse or ransomware groups expanding operations to cloud environments (Mentioned organization is Halcyon Research Team).
## Detection Methods
- Signature-based detection: Not applicable directly to the technique itself, but applicable to any accompanying malware used for credential harvesting/access.
- Behavioral detection: Monitoring for anomalous AWS API call patterns, specifically related to S3 modifications by potentially compromised credentials.
- YARA rules: N/A
## Mitigation Strategies
- Principle of Least Privilege (PoLP) enforcement for IAM roles accessing S3.
- Strict control and monitoring over IAM credentials that possess `s3:PutObject` or `s3:CopyObject` permissions.
- Utilizing AWS KMS (SSE-KMS) instead of SSE-C, ensuring key management stays within AWS-controlled boundaries unless the KMS keys themselves are compromised.
- Implementing strict bucket policies to restrict encryption options or key usage.
## Related Tools/Techniques
- Other cloud-based ransomware techniques targeting storage services (e.g., Azure Blob Storage manipulation).
- Standard ransomware binaries used to harvest AWS access keys.