Full Report
Activision last week brought offline the Microsoft Store version of Call of Duty: WWII as the company was investigating “reports of an issue.”
Analysis Summary
# Incident Report: Call of Duty: WWII PC Exploit Leads to Game Takedown
## Executive Summary
Activision took the PC version of *Call of Duty: WWII* (Microsoft Store/Game Pass release) offline following reports that PC players were experiencing computer hacks, traced back to a Remote Code Execution (RCE) exploit within the game. The incident led to the temporary removal of the game from service to investigate and patch the vulnerability impacting user systems.
## Incident Details
- Discovery Date: Last week (prior to July 8, 2025)
- Incident Date: Ongoing exploitation leading up to the takedown announcement.
- Affected Organization: Activision
- Sector: Gaming / Entertainment
- Geography: Global (PC Players affected)
## Timeline of Events
### Initial Access
- Date/Time: Prior to July 8, 2025
- Vector: Remote Code Execution (RCE) exploit within the specific PC version of *Call of Duty: WWII*.
- Details: Attackers exploited a vulnerability that allowed them to remotely execute code on players' machines simply by playing the game.
### Lateral Movement
- Details: Information not explicitly detailed, but the nature of RCE implies attackers gained direct control over the compromised hosts. Symptoms reported by users ranged from disruptive pop-ups (e.g., a lawyer's image in Notepad) to system shutdowns.
### Data Exfiltration/Impact
- Details: While specific data exfiltration is not confirmed, the RCE exploit means attackers had the capability to compromise the entire desktop environment of affected players. The primary impact was service disruption and compromise of player systems.
### Detection & Response
- Date/Time: Activision announced the takedown last week (prior to July 8, 2025).
- Details: Activision officially took the Microsoft Store/Game Pass version of *Call of Duty: WWII* offline for investigation and remediation after receiving reports of issues, later confirmed to be hacking incidents.
## Attack Methodology
- Initial Access: **RCE Exploit** within the game client/server interaction for the newly launched PC version (Microsoft Store/Game Pass).
- Persistence: Unknown, though immediate machine control via RCE suggests rapid, active exploitation rather than long-term persistence was the immediate threat.
- Privilege Escalation: Not specified, but RCE often grants the attacker high-level access on the compromised host machine.
- Defense Evasion: Not detailed, but the exploit was successfully leveraged until Activision intervened.
- Credential Access: Potential, given RCE on user PCs.
- Discovery: Game players noticing unusual activity (pop-ups, system shutdowns, wallpaper changes) and reporting these issues on social media and Reddit.
- Lateral Movement: Not detailed.
- Collection: Potential access to local user files and data on compromised PCs.
- Exfiltration: Not detailed, but plausible given the RCE capability.
- Impact: System control, digital vandalism (wallpaper changes), and potential full compromise of user machines.
## Impact Assessment
- Financial: Costs associated with investigating the exploit and patching the game.
- Data Breach: Potential compromise of user endpoints; specific data volume unknown.
- Operational: Complete shutdown of the *Call of Duty: WWII* PC version on the Microsoft Store/Game Pass platform.
- Reputational: Negative press coverage regarding the security of their game updates/launches.
## Indicators of Compromise
*Note: No specific technical IOCs (IPs, hashes) were provided in the source text, therefore behavioral indicators are listed.*
- **Behavioral indicators**: Unsolicited pop-ups (e.g., Notepad showing a lawyer’s image), unexpected system shutdowns, malicious wallpaper changes occurring while playing the game.
## Response Actions
- **Containment measures**: Taking the affected Microsoft Store PC version of *Call of Duty: WWII* offline globally.
- **Eradication steps**: Working to develop and apply a patch to resolve the RCE vulnerability.
- **Recovery actions**: Anticipated relaunch of the secure PC version once the patch is implemented.
## Lessons Learned
- Key takeaways: Newly released or updated versions of games, particularly those interfacing with operating system layers (like those via the Microsoft Store/Game Pass), must undergo rigorous security auditing to prevent critical flaws like RCE from reaching production.
- What could have been done better: Proactive security testing identified the RCE flaw before the launch of the Microsoft Store version.
## Recommendations
- Implement stricter, source-code level security analysis for all game builds deployed on PC platforms.
- Immediately isolate and rollback services when reports of system-level compromise (like RCE) are verified by multiple users post-launch.
- Enhance monitoring on newly launched services for unusual host system activity originating from game processes.