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Taidoor is a long-running Chinese cyber-espionage threat activity cluster associated with intrusions against Taiwanese government entities and related organizations. Activity has been publicly tracked since at least 2008–2009. The actor is known for targeted spear-phishing operations using seemingly benign documents and malicious Microsoft Office files to execute malware, including exploitation of CVE-2012-0158. Taidoor has been linked to campaigns focused on stealing confidential information rather than disruptive or financially motivated operations. Victimology is centered on Taiwan, particularly government agencies and public-sector bodies. Taidoor has also been named in broader intrusion activity affecting Taiwanese outsourced IT service providers connected to government departments, indicating supply-chain compromise as part of its operational ecosystem. Reported tradecraft includes initial access via phishing documents, persistence on compromised systems, and data exfiltration. In the Taiwan government intrusions with which Taidoor was associated, attackers used SoftEther VPN on internal hosts and servers to maintain long-term access and move stolen data out of victim environments. Taidoor is commonly discussed alongside other China-linked intrusion sets active against Taiwan, including Mustang Panda, APT40, and BlackTech, but it remains a distinct tracked name. Its observed behavior is consistent with a state-aligned espionage actor focused on government intelligence collection and sustained access to targeted networks.
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Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Sectors the actor has been observed targeting.
Geographies tied to known operations.
Attributed origin per open-source reporting.
3 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
36 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Named by the investigation bureau as one of the Chinese threat groups involved in attacks against Taiwanese government agencies via outsourced IT service providers / supply-chain intrusion activity.
Long-running targeted attack campaign using malicious documents to execute payloads in the background and exploiting CVE-2012-0158. Also referenced as targeting Taiwanese agencies.
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Every observed MITRE ATT&CK technique, grouped by tactic.
Families this actor is known to deploy, with IOCs and behavior.
CVEs this actor has used in known campaigns.
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Domains, IPs, and hashes tied to this actor, refreshed continuously.