Hunt for adversary abuse of legitimate cloud services for C2, data staging, and exfiltration including abuse
日本語に翻訳 name: hunting-for-living-off-the-cloud-techniques
description: Hunt for adversary abuse of legitimate cloud services for C2, data staging, and exfiltration including abuse
of Azure, AWS, GCP services, and SaaS platforms.
domain: cybersecurity
subdomain: threat-hunting
tags:
threat-hunting
mitre-attack
cloud-abuse
c2
lotc
saas
proactive-detection
version: '1.0'
author: mahipal
license: Apache-2.0
d3fend_techniques:
Application Protocol Command Analysis
Network Isolation
Network Traffic Analysis
Client-server Payload Profiling
Network Traffic Community Deviation
nist_csf:
DE.CM-01
DE.AE-02
DE.AE-07
ID.RA-05
Hunting For Living Off The Cloud Techniques
When to Use
When proactively hunting for indicators of hunting for living off the cloud techniques in the environment
After threat intelligence indicates active campaigns using these techniques
During incident response to scope compromise related to these techniques
When EDR or SIEM alerts trigger on related indicators
During periodic security assessments and purple team exercises
Prerequisites
EDR platform with process and network telemetry (CrowdStrike, MDE, SentinelOne)
SIEM with relevant log data ingested (Splunk, Elastic, Sentinel)
Sysmon deployed with comprehensive configuration
Windows Security Event Log forwarding enabled
Threat intelligence feeds for IOC correlation
Workflow
Formulate Hypothesis : Define a testable hypothesis based on threat intelligence or ATT&CK gap analysis.Identify Data Sources : Determine which logs and telemetry are needed to validate or refute the hypothesis.Execute Queries : Run detection queries against SIEM and EDR platforms to collect relevant events.Analyze Results : Examine query results for anomalies, correlating across multiple data sources.Validate Findings : Distinguish true positives from false positives through contextual analysis.Correlate Activity : Link findings to broader attack chains and threat actor TTPs.Document and Report : Record findings, update detection rules, and recommend response actions.
Key Concepts
Concept Description T1102 Web Service T1567 Exfiltration Over Web Service T1537 Transfer Data to Cloud Account
Tools & Systems
Tool Purpose CrowdStrike Falcon EDR telemetry and threat detection Microsoft Defender for Endpoint Advanced hunting with KQL Splunk Enterprise SIEM log analysis with SPL queries Elastic Security Detection rules and investigation timeline Sysmon Detailed Windows event monitoring Velociraptor Endpoint artifact collection and hunting Sigma Rules Cross-platform detection rule format
Common Scenarios
Scenario 1 : C2 over Discord webhooks for command deliveryScenario 2 : Data exfiltration to Telegram bot APIScenario 3 : Malware using Azure Functions for dynamic C2Scenario 4 : Staging stolen data on Google Docs or Notion pages
Output Format
Hunt ID: TH-HUNTIN-[DATE]-[SEQ]
Technique: T1102
Host: [Hostname]
User: [Account context]
Evidence: [Log entries, process trees, network data]
Risk Level: [Critical/High/Medium/Low]
Confidence: [High/Medium/Low]
Recommended Action: [Containment, investigation, monitoring]