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Operation Rewrite, also tracked as CL-UNK-1037, is a Chinese-speaking threat cluster associated with compromises of Microsoft IIS servers and the deployment of BadIIS malware. The cluster has been linked to server-side abuse supporting SEO manipulation and traffic redirection operations. BadIIS functionality associated with this activity includes proxying attacker-controlled content, injecting JavaScript into web responses, and manipulating search-engine visibility and redirection behavior, including selective activation when requests appear to originate from search-engine crawlers. Operation Rewrite has been identified in overlap with other Chinese-speaking IIS-focused intrusion activity and is part of a broader ecosystem of clusters abusing exposed or weakly secured IIS infrastructure. The tradecraft associated with these operations includes initial access through vulnerable or weakly configured web applications, use of web shells, persistence on compromised servers, defense evasion through customized tooling, and post-compromise server manipulation to support fraudulent SEO campaigns. Available reporting supports characterization as a cybercrime-oriented actor rather than a ransomware or destructive operator.
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1 malware family attributed to this actor across reporting.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Named operation associated with Chinese threat activity targeting IIS servers (no additional details provided in this content).
Named activity cluster associated (in this reporting) with use of BadIIS malware for IIS-based SEO fraud/traffic manipulation.
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