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Volt Typhoon is a China-linked, state-sponsored threat actor focused on long-term clandestine access to critical infrastructure, particularly in the United States. It is widely tracked under multiple aliases including Bronze Silhouette, DEV-0391, Insidious Taurus, Storm-0391, UNC3236, Vanguard Panda, Voltzite, and Volt Typhoon APT, and is also associated with ATT&CK group identifier G1017. The actor is best known for stealthy pre-positioning inside critical infrastructure networks to enable potential disruptive effects during a future geopolitical crisis, especially one involving Taiwan. Reported targeting has centered on communications, energy, transportation, and water sectors in the United States. Public reporting and government assessments characterize the activity as consistent with Chinese strategic objectives rather than financially motivated crime. Volt Typhoon is notable for extensive living-off-the-land tradecraft designed to minimize forensic visibility and blend into normal administrative activity. The group has been associated with quiet persistence, use of valid or native system capabilities, and operational security practices intended to sustain access over long periods. It has also been linked to exploitation for privilege escalation and to the broader Chinese practice of using Operational Relay Box infrastructure built from compromised edge devices to obscure origin and relay operations. The actor has targeted network edge technologies, including Fortinet products, and has been repeatedly cited by U.S. and allied agencies as a model case for Chinese pre-positioning in civilian critical infrastructure. Its operations are frequently discussed in the context of contingency preparation for disruptive attacks against essential services rather than immediate destructive action. Volt Typhoon is therefore regarded as a strategically significant cyber espionage and access-enablement actor within the broader China-nexus intrusion ecosystem.
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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.
53 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
32 malware families attributed to this actor across reporting.
27 additional families tracked in Mallory.
33 CVEs this actor has used in observed campaigns. 33 of them exploited in the wild.
Fortinet disclosed in February that the Chinese Volt Typhoon hacking group exploited two FortiOS SSL VPN flaws (CVE-2022-42475 and CVE-2023-27997) to backdoor a Dutch Ministry of Defence military network using custom Coathanger remote access trojan (RAT) malware.
Fortinet disclosed in February that the Chinese Volt Typhoon hacking group exploited two FortiOS SSL VPN flaws (CVE-2022-42475 and CVE-2023-27997) to backdoor a Dutch Ministry of Defence military network using custom Coathanger remote access trojan (RAT) malware.
In another Secureworks IR engagement in September 2021, the activity was slightly briefer. This time the attackers exploited a public-facing application to obtain initial access. Secureworks surmised that it was likely to have been an exploitation of CVE-2021-40539 against a ManageEngine ADSelfService Plus server.
"Lumen Technologies reported Chinese APT Volt Typhoon exploiting Versa Director servers (CVE-2024-39717), enabling credential interception and malicious code injection." | Lumen Technologies reported Chinese APT Volt Typhoon exploiting Versa Director servers (CVE-2024-39717), enabling credential interception and malicious code injection.
CVE-2024-21762 (CVSS skóre 9,6) Kritická zraniteľnosť CVE-2024-21762 sa nachádza v komponente sslvpnd a umožňuje zapisovať mimo povolené hodnoty vyrovnávacej pamäte. Úspešné zneužitie umožňuje neautentifikovanému útočníkovi ľubovoľné vykonávanie kódu alebo príkazov prostredníctvom špeciálne vytvorených HTTP požiadaviek. Pre zraniteľnosť nie je vydaná dočasná mitigácia... Zraniteľnosť CVE-2024-21762 môže byť aktívne zneužívaná.
28 more CVEs tied to this actor tracked in Mallory.
132 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Referenced as an example of a group known for pre-positioning and quiet persistence against U.S. critical infrastructure; not described as operating ENDLESSDOORS in this report.
Chinese threat actor described as pre-positioning in US critical infrastructure and utility sectors to enable disruption during a future crisis, especially one related to Taiwan.
Referenced as a state-sponsored threat actor interested in pre-positioning within U.S. water and other critical infrastructure networks.
Referenced as an example of below-threshold intrusions involving pre-positioning in U.S. critical infrastructure to illustrate the strategic significance of nondestructive cyber operations.
Match sector + geo + tech-stack targeting against your real footprint.
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.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Domains, IPs, and hashes tied to this actor, refreshed continuously.