Full Report
Authored by Oliver Devane and Vallabh Chole September 9, 2022 Update: Since the original publication of this blog on August... The post Malicious Cookie Stuffing Chrome Extensions with 1.4 Million Users appeared first on McAfee Blog.
Analysis Summary
The provided article abstract is extremely brief and primarily serves as navigation and promotional text for McAfee products, rather than describing a specific malware family, attack tool, or set of techniques in detail.
Based *only* on the headline visible in the context, the summary will focus on the threat mentioned: **Malicious Cookie Stuffing Chrome Extensions.**
# Tool/Technique: Malicious Cookie Stuffing Chrome Extensions
## Overview
This refers to the abuse of legitimate-looking or seemingly useful Google Chrome browser extensions to perform "cookie stuffing," a technique used to inject tracking or session cookies into a user's browser without their explicit consent for that specific action, often related to affiliate marketing fraud or session hijacking.
## Technical Details
- Type: Malware / Malicious Browser Extension
- Platform: Google Chrome (Browser ecosystem)
- Capabilities: Injecting unauthorized cookies (session or tracking) into browser storage.
- First Seen: Not explicitly provided in the context, but cookie stuffing is a long-standing technique.
## MITRE ATT&CK Mapping
Since the execution vector is a browser extension and the goal relates to data theft/session manipulation:
- **TA0002 - Execution**
- T1204 - User Execution
- T1204.002 - Malicious File
- **TA0010 - Exfiltration**
- T1048 - Exfiltration Over Alternative Protocol (If cookies are later transmitted, although direct cookie injection is the primary focus)
## Functionality
### Core Capabilities
- Installation via the Chrome Web Store (implying social engineering or deception).
- Execution within the context of the user's browsing session.
- Injection of cookies or session tokens into the browser's storage mechanisms.
### Advanced Features
- The scale mentioned (1.4 million users) suggests a high degree of distribution, likely achieved by masking malicious functionality under the guise of popular or useful extension features.
## Indicators of Compromise
*Note: Specific IOCs are not available in the provided text fragment.*
- File Hashes: [Not specified]
- File Names: [Not specified, but would be the names of the malicious extensions]
- Registry Keys: [Not applicable for extension storage, though local user profiles are affected]
- Network Indicators: [Not specified, but connections to affiliate or tracking servers are highly likely]
- Behavioral Indicators: Unauthorized insertion of cookies onto visited domains; excessive communication for a benign-looking extension.
## Associated Threat Actors
- [Not specified in the context, but such operations are often conducted by affiliate fraud rings or sophisticated advertising networks.]
## Detection Methods
*Note: Detection focuses on the extension lifecycle and behavior.*
- Signature-based detection: Hash-matching known malicious extension packages (`.crx` files).
- Behavioral detection: Monitoring for JavaScript code executing unauthorized storage access or unexpected HTTP requests from the extension context.
- YARA rules: Applicable to static analysis of extension source code or binary blobs if packed.
## Mitigation Strategies
- Scrutinize extension permissions requested during installation.
- Limit the number of installed extensions.
- Use enterprise management tools to vet and enforce approved extensions.
- Regular auditing of browser extension lists.
## Related Tools/Techniques
- Ad Nauseam (Legitimate extension with similar underlying concepts of click simulation).
- Session Hijacking via cookie theft.