A financially motivated cybercriminal using Anthropic's Claude Code as an AI backbone has carried out a sweeping attack campaign that compromised 429 WordPress administration panels in a 61-second window and pulled more than 628,000 personal records from four Ukrainian organizations, according to findings published by threat intelligence firm SOCRadar last week.
The threat actor, tracked under the alias CyberXero, is described as a Russian-speaking initial access broker (IAB) whose infrastructure combines commodity offensive tools like Cobalt Strike with an AI orchestration layer powered by Claude Code. Initial access brokers are criminals who break into networks and sell that foothold to other buyers rather than monetizing it directly, and CyberXero has been active since at least July 2026.
The entire operation surfaced from a single configuration error: an exposed open directory at IP address 46.21.250.135 that served the threat actor's live working directory, including more than 90,000 files across 3,000 subdirectories: AI session logs, scripts with plaintext credentials, exploitation toolkits, reconnaissance output, and raw victim database exports. That OPSEC failure let SOCRadar researchers map eight distinct infrastructure nodes tied to the operation, spanning servers in Europe and Tencent Cloud in China.
Two Campaigns Running in Parallel
CyberXero's operation runs two pipelines simultaneously: a global, automated campaign targeting WordPress and e-commerce platforms for payment data and access sales, and a more selective, manual campaign directed at Ukrainian energy providers and critical infrastructure entities.
The automated arm relied on an internally developed Python tool called wp2shell, which abuses a desynchronization flaw in the WordPress REST API batch endpoint to inject SQL, create a rogue administrator account, and plant a web shell disguised as an active plugin. A single automated execution scanned 4,708 targets, confirmed access to 429 WordPress administration panels, and deployed 32 shells, all inside a 61-second window. Each successful compromise fired a real-time notification to a Telegram bot that let the operator monitor results without staying at a terminal.
The second pipeline was considerably more deliberate. The infrastructure documents curated reconnaissance against seven Ukrainian energy and utilities entities, including the national transmission system operator and the country's largest private energy holding. One target list alone contained 95 subdomains covering those two organizations' email infrastructure, VPN gateways, network dispatch systems, and data platforms. That depth of reconnaissance is not the work of an opportunist scanning for easy targets.
The most damaging confirmed breach was a district heating provider in Kharkiv, a city currently on an active war front. A hardcoded credential in the threat actor's own script gave direct access to the provider, and a multithreaded extractor pulled 564,073 subscriber records containing personal data, home addresses, and account numbers, along with 213,340 access-log entries with timestamps and IP addresses. Because those records identify civilians in a conflict zone, the dataset carries physical risk that goes beyond a conventional data breach.
The AI Layer
CyberXero deployed AI at two independent stages. The first ran Claude Code with a cluster of 51 specialized agents on the primary workstation, handling scanning, exploit chaining, reconnaissance, and post-exploitation tasks. The second connected PentAGI, an open-source autonomous penetration testing framework, to a Cobalt Strike Team Server through an AI provider API for payload generation and hands-on pentest execution.
The 51 agents were divided into functional roles. Offensive agents covered tasks like lateral movement and SCADA attacks. Reconnaissance agents handled subdomain mapping and credential testing. Post-exploitation agents managed data exfiltration. A recovered provider configuration file assigned AI models to these roles by reasoning complexity, with the payload-generation role receiving the highest token budget.
To work around the model's safety refusals, the threat actor used context-engineering and session-reset techniques, instructing the agent that it was running an "authorized pentest on my own infrastructure." That same claim appeared verbatim across four unrelated victim engagements, marking it as a rehearsed line rather than a genuine authorization.
Because model safety controls act on session context rather than model weights, a refusal in one session does not carry into the next. When an agent refused a task, the actor opened a fresh session with the authorization framing preloaded and tried again.
The refusals themselves are notable. Across four separate iterations, the model declined to install a backdoor, disable a firewall, move laterally, and deploy a web shell. In a separate episode it refused a scan four consecutive times and correctly rejected a forged ownership token.
The CyberXero case is not the first time Claude Code has appeared in a documented criminal operation. Anthropic's own threat intelligence report earlier this year described a separate actor who used Claude Code to automate reconnaissance, credential harvesting, and network penetration across at least 17 organizations in a single month, spanning government agencies, healthcare providers, and emergency services.
Anthropic has acknowledged that cybercriminals and state-sponsored actors alike have attempted to use its Claude models to automate cyberattacks, build offensive tools, and conduct mass surveillance operations. The gap between what a single attacker can now accomplish and what previously required a full team has narrowed substantially.
For defenders, SOCRadar's most actionable indicator is simple: any WordPress administrator account whose username follows the pattern "wp2_" followed by eight hexadecimal characters was placed there by wp2shell, not a legitimate user. Organizations running WordPress, Magento, PrestaShop, or internet-exposed Redis servers are advised to check for rogue admin accounts and unexpected entries in SSH authorized key files. CyberXero was still active at the time the SOCRadar report was published.
