Incident Score: Analysis & Impact (ANTARK1774585435)

Rankiteo's analysis has identified several MITRE ATT&CK tactics and techniques associated with this incident, each with varying levels of confidence based on available evidence. Under the Initial Access tactic, the analysis identified Drive-by Compromise (T1189) with high confidence (90%), supported by evidence indicating attackers could embed the vulnerable component in a hidden iframe, triggering the exploit when a victim visited a malicious page and Exploit Public-Facing Application (T1190) with moderate to high confidence (80%), supported by evidence indicating dOM-Based XSS in Arkose Labs CAPTCHA component (a-cdn.claude.ai) exploited. Under the Execution tactic, the analysis identified Exploitation for Client Execution (T1203) with high confidence (90%), supported by evidence indicating arbitrary JavaScript execution via dangerouslySetInnerHTML in React and JavaScript (T1059.007) with high confidence (90%), supported by evidence indicating unsanitized stringTable field allowed arbitrary JavaScript execution. Under the Privilege Escalation tactic, the analysis identified Bypass User Account Control (T1548.002) with moderate to high confidence (70%), supported by evidence indicating claude extension treated malicious prompt as legitimate user command due to trusted origin. Under the Credential Access tactic, the analysis identified Steal Application Access Token (T1528) with high confidence (90%), supported by evidence indicating theft of Google OAuth tokens (persistent access to Gmail/Drive). Under the Collection tactic, the analysis identified Data from Local System (T1005) with moderate to high confidence (80%), supported by evidence indicating exfiltration of LLM conversation history, Google Drive files and Email Collection: Remote Email Collection (T1114.002) with moderate to high confidence (80%), supported by evidence indicating silent email sending via compromised accounts. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with moderate to high confidence (80%), supported by evidence indicating attack scenarios included exfiltration of chat histories and OAuth tokens. Under the Defense Evasion tactic, the analysis identified Code Signing: Code Signing Policy Modification (T1553.002) with moderate to high confidence (70%), supported by evidence indicating overly permissive origin allowlist (*.claude.ai) treated malicious prompts as trusted and Obfuscated Files or Information (T1027) with moderate to high confidence (70%), supported by evidence indicating attack required no clicks, permissions, or visible indicators. Under the Impact tactic, the analysis identified Defacement: Internal Defacement (T1491.001) with moderate confidence (60%), supported by evidence indicating silent hijacking of AI assistant without user interaction. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.