Title	Author	Created	Published	Tags
StealC - Outline	Jon Marien	September 24, 2025	September 24, 2025	[[#issessions|#issessions]], [[#writeups|#writeups]]

StealC - Outline

Final Presentation Outline: The BlockBlasters Breach - Anatomy of a Gaming Cryptostealer

I. Introduction (2 minutes)

• Title Slide: The BlockBlasters Breach: Anatomy of a Gaming Cryptostealer
• The Hook:
  • Begin with the compelling, human-impact story of Raivo “RastalandTV” Plavnieks losing his cancer treatment funds live on stream.
• The Problem:
  • Broaden the scope: This isn’t just about one game. It’s about the weaponization of trust on platforms we use every day.
• Agenda:
  • Briefly outline the presentation’s journey: The story, the platform’s failure, the malware’s mechanics, how to hunt it, lessons learned, and how to protect ourselves.

II. The “BlockBlasters” Incident: A Case Study (5 minutes)

• The Deception: A Perfect Trojan Horse
  • Introduce “BlockBlasters” as a seemingly legitimate, well-reviewed indie game on Steam.
  • [Screenshot: BlockBlasters Steam store page showing positive reviews and legitimate appearance]
  • Emphasize the Trojan Horse strategy: The game was clean for a month, building a positive reputation before the malicious patch (Build 19799326) was deployed.
  • [Screenshot: SteamDB showing the timeline of updates, highlighting Build 19799326]
• The Betrayal and Mockery:
  • Show the final update that replaced the game with hi.txt just before it was taken down.
  • [Screenshot: SteamDB patch notes showing the final "hi.txt" update before removal]
• The Impact:
  • Quantify the damage: Over $150,000 stolen from hundreds of victims.
  • [Screenshot or clip: RastalandTV losing funds live on stream - if available]

III. Platform Responsibility: The Valve Vector (4 minutes)

• A Colossal Failure:
  • Directly address the core issue: The malware was live on Steam for nearly a month, highlighting a significant gap in Valve’s security vetting process for game updates.
• A Pattern of Abuse:
  • Show this is not an isolated incident. Mention other games on Steam used to distribute malware in 2025 (e.g., “PirateFi,” “Chemia”).
• The Vetting Challenge:
  • Discuss the difficulty of continuously monitoring updates versus a one-time review. Pose critical questions about platform liability.

IV. Technical Deep Dive: Inside StealC Malware (7 minutes)

• The StealC Family: Introduce StealC as a potent Malware-as-a-Service (MaaS) info-stealer.
• Infection & Evasion (BlockBlasters Variant):
  • Detail the execution flow from launch.vbs.
  • Explain its environment-aware capabilities: checking for admin rights, reconnaissance, and AV/EDR detection.
• Theft & Exfiltration:
  • Showcase its primary targets: Steam credentials (loginusers.vdf), browser data, and crypto wallets.
• Dynamic & Targeted Payloads:
  • Explain the C2’s role in orchestrating the attack using whitelisted_users.txt.

V. Detection & Response (3 minutes)

• Indicators of Compromise (IOCs):
  • Provide concrete IOCs from the vx-underground report (File Hashes, C2 IP).
• Hunting with YARA:
  • Briefly explain YARA rules as “fingerprints” for malware.
• Organizational Detection Strategies:
  • Network Monitoring (outbound traffic to known malicious IPs).
  • Endpoint Monitoring (suspicious process chains, unusual file access).

VI. Lessons Learned (3 minutes)

• For the Security Community: Highlight the power of collaborative, open-source intelligence.
• For Threat Actors (Their Failures): Point out the attackers’ OPSEC mistakes (exposed Telegram tokens, vulnerable C2).
• For Platforms: Reiterate the critical need for continuous security vetting of software updates.

VII. The Rogues’ Gallery: StealC vs. The World (1 minute)

• Quick Comparison: Briefly show the comparative table (StealC vs. Vidar, Raccoon, RedLine).

VIII. Protecting Yourself: Actionable Recommendations (3 minutes)

• For Gamers: Be wary of updates, avoid pirated software, use standard user accounts.
• For Crypto Users: Use hardware wallets, be vigilant against phishing, enable 2FA.

IX. Conclusion & Q&A (2 minutes)

• Summarize Key Takeaways: Weaponization of gaming platforms, supply chain security, and the power of a security-first mindset.
• Open the floor for questions.