How Call of Duty's Ricochet Anti-Cheat Uses Machine Learning and Shadow Bans to Isolate Cheaters

Traditional anti-cheat systems operate on a rigid, binary premise: the moment unauthorized software is detected, the offending account is permanently banned from the server. Activision’s Ricochet security architecture for the Call of Duty franchise deliberately breaks that rule. Instead of immediately removing suspected cheaters from the game, the system quietly funnels them into isolated, limited matchmaking pools—a purgatory widely known within the community as a shadow ban. This approach frustrates players who expect immediate justice, but it represents a fundamental shift in how developers handle game security. By keeping the suspect engaged in a controlled environment, the anti-cheat software transforms the cheater into a data source, allowing engineers to study the intrusion before the cheat developer realizes their tool has been compromised.[1]

The rationale behind this delayed enforcement has historically been heavily guarded, but on September 10, 2026, Call of Duty's Senior Director of Game Security, David Andrews, detailed the exact mechanics of the review process. Speaking to IGN, Andrews confirmed that shadow bans are not a glitch in the enforcement pipeline, but a necessary holding pattern designed to buy the security team time. "We have limited matchmaking that we will put a suspicious account into to isolate them while other checks are either running or we're waiting on other data," Andrews explained. The confirmation validates years of community suspicion regarding the existence of these isolated lobbies, framing them as active quarantine zones rather than automated errors.[1]

The stakes in competitive gaming security have escalated into a highly lucrative arms race. Cheat developers operate profitable subscription services, and their primary objective is to reverse-engineer exactly how a game detects their software. If Ricochet were to issue a ban the millisecond a cheat was activated, the developer would immediately know which specific memory hook or input spoofer triggered the alarm, allowing them to patch the vulnerability and push an update to their customers within hours.[4]

By utilizing a shadow ban, Activision obscures the exact moment of detection. "It's kind of this stop gap measure," Andrews noted, adding that the isolation allows the security team to evaluate the threat without ruining the experience for legitimate players in standard lobbies. In some cases, the limited matchmaking even serves as a rehabilitation tool, warning players to cease their behavior before an irreversible hardware ban is executed.[1]

The sheer volume of matches played across Modern Warfare, Black Ops, and Warzone makes manual review mathematically impossible. To bridge the gap between automated flags and human verification, Ricochet relies heavily on server-side machine learning. Prior to the integration of these advanced models, a human investigator utilizing the internal Replay Investigation Tool could review roughly 700 gameplay clips in a single day. While that volume was sufficient for catching blatant infractions, it was entirely inadequate for identifying players using subtle aim-assist tools designed to mimic natural human movement.[3]

Today, machine learning algorithms ingest massive streams of telemetry to flag statistical anomalies that human eyes might miss. A cheat that does not inject code into the game—such as a pixel-scanning trigger bot—can still be caught by its behavioral signature. The models analyze mouse movement trajectories, reaction times, and recoil compensation, comparing them against datasets of both legitimate professionals and known cheaters to calculate a probability score.[4][5]

This server-side analysis is paired with a highly privileged client-side component: the kernel-level driver. Introduced to Warzone in October 2021, the Ricochet driver operates at Ring 0, the deepest level of the Windows operating system. This grants the anti-cheat software the same level of system access as a graphics card driver, allowing it to monitor any process attempting to interact with the game's memory.[7]

Privacy advocates frequently raise concerns about kernel-level access, fearing the potential for overreach or security vulnerabilities. Activision has maintained strict operational boundaries to mitigate this risk. The Ricochet driver is not an always-on service; it boots up only when a protected Call of Duty title is launched and terminates the moment the application is closed, ensuring it only monitors software actively interacting with the game.[7]

Despite these deep system hooks, the cheating industry continually adapts. By 2024, a significant portion of the illicit market shifted toward hardware-based solutions. Devices like the Cronus Zen and XIM Matrix manipulate controller inputs to eliminate recoil or simulate machine-perfect aim, bypassing software memory scans entirely by presenting themselves to the computer as standard USB controllers.[2]

Ricochet’s response to input modifiers has been aggressive and highly measurable. Following a wave of targeted detections, Activision reported that nearly two-thirds of players who received temporary bans for using devices like the Cronus Zen did not return to them upon their reinstatement. The system learns the mechanical signature of the hardware, rendering the physical device a liability rather than a competitive advantage. This enforcement strategy relies on behavioral conditioning as much as software detection, using temporary suspensions to break the habit.[2]

The most severe hardware threat in 2026, however, is the Direct Memory Access (DMA) card. These physical PCIe devices are installed directly onto a motherboard, reading system memory over the bus and bypassing the CPU entirely. Because the operating system is not involved in the memory read, a kernel-level driver cannot easily detect a properly spoofed DMA card, forcing security teams to rely almost entirely on server-side heuristics.[6]

To combat threats that bypass local software, Activision fundamentally altered its PC security requirements in June 2026 with the Season 04 update. The company integrated Microsoft Azure Attestation to verify the hardware integrity of a player's machine before a match even begins, shifting the verification burden from the local client to the cloud.[2]

This cloud-based attestation requires modern security standards, specifically TPM 2.0 and Secure Boot, to access competitive Ranked Play. Rather than trusting the local PC to report its own security status—which a sophisticated cheat could spoof—the system validates the hardware against trusted Microsoft servers, creating a cryptographic handshake that is exceptionally difficult to forge.[2]

The enforcement for failing this attestation check mirrors the shadow ban philosophy. Players who do not pass the verification are not permanently banned, but they are severely restricted. They are placed into a separate matchmaking pool, limiting their access to specific casual playlists like Nuketown 24/7 in Black Ops 7 or Battle Royale Casual in Warzone, effectively quarantining unverified hardware from the competitive ecosystem.[2]

This multi-tiered architecture—combining Ring 0 drivers, cloud-based hardware attestation, and machine learning heuristics—illustrates how complex game security has become. It is no longer a matter of simply scanning a hard drive for known malicious files; it requires a holistic analysis of how a player's hardware, software, and physical inputs interact in real time.[6][8]

The system must constantly weigh the risk of false positives against the damage a single cheater can inflict on a lobby of 100 players. High-skill players with exceptional reaction times occasionally trigger the behavioral heuristics, which is exactly why the shadow ban exists: to provide a buffer for manual review before an irreversible hardware ban is executed.[4][8]

The friction between player experience and security protocols will persist as long as competitive gaming remains lucrative. Cheat developers will continue to exploit vulnerable drivers and engineer new hardware bypasses, forcing systems like Ricochet to demand even deeper system verification. The ongoing arms race guarantees that anti-cheat software will only become more invasive, relying on cloud attestation and behavioral profiling to hold the line against the next generation of memory exploits.[1][4]