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UTA0533 is an unattributed threat actor tracked by Volexity for zero-day exploitation of SonicWall Secure Mobile Access (SMA) 1000 VPN appliances beginning at least June 22, 2026. The actor chained CVE-2026-15409, a pre-authentication server-side request forgery vulnerability, with CVE-2026-15410, a vulnerability in the appliance's hotfix-removal workflow, to obtain root-level command execution. The chain exposed otherwise local-only services and enabled compromise without valid VPN credentials or user interaction. UTA0533 deployed ROOTRUN, a setuid utility providing root command execution, and KNUCKLEBALL, a Python loader that injected Java payloads into a legitimate SonicWall process. Those payloads included a modified Suo5 HTTP proxy for covert tunneling and ORANGETAIL, a custom memory-resident Java web shell supporting encrypted payload execution. The actor modified appliance startup and web-routing configurations to maintain persistence and expose implanted functionality. Post-compromise activity included credential harvesting, capture of unencrypted LDAP traffic, and attempts to move laterally into internal networks, with limited observed success. UTA0533's country of origin, organizational affiliation, and dominant motivation have not been established; its exploitation of vulnerabilities also used by INC Ransomware does not establish that the two are the same actor.
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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.
27 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt.
6 malware families attributed to this actor across reporting.
1 additional family tracked in Mallory.
2 CVEs this actor has used in observed campaigns. 2 of them exploited in the wild.
The attackers first exploited CVE-2026-15409 to abuse the SMA1000's '/wsproxy' endpoint, allowing them to establish unauthenticated WebSocket tunnels to services that should only have been accessible from the appliance itself.
After obtaining the appliance's product_uuid, the attackers exploited the CVE-2026-15410 command injection vulnerability through the Appliance Management Console's 'sysCtrl.execRemoveHotfix' RPC method, allowing them to execute commands as root and take full control of the appliance.
34 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.
Exploited two SonicWall SMA 1000 vulnerabilities as zero-days in June 2026 to deploy Java web shells and KNUCKLEBALL malware. Mentioned as historical background; the article does not attribute exploitation of CVE-2026-102255 to UTA0533.
Used CVE-2026-15409 to deploy KNUCKLEBALL malware.
Exploited separate SonicWall SMA 1000 zero-day vulnerabilities in an earlier July 2026 campaign associated with KNUCKLEBALL malware. The content does not establish a link between UTA0533 and the active exploitation of CVE-2026-83548 and CVE-2026-83549.
Exploited a chain of two then-zero-day vulnerabilities against SonicWall SMA 1000 VPN appliances to gain root-level access and deploy the malicious Python script KNUCKLEBALL.
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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.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Domains, IPs, and hashes tied to this actor, refreshed continuously.