Flax Typhoon ArcGIS web-shell persistence campaign
Campaign
Summary
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Flax Typhoon is conducting a campaign that abuses a legitimate public-facing ArcGIS application to create persistent backdoor access, raising the risk of lateral movement and credential harvesting. The operation matters because the adversaries turned trusted infrastructure into a covert entry point that can survive ordinary remediation. Their access path used a malicious SOE/web shell chain and a renamed SoftEther VPN tool to blend into internal traffic.
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ArcGIS system / public-facing ArcGIS server hit by data theft breach
Incident
H score28
First: 14.10.2025 19:55
Last: 14.10.2025 19:55
Sources 1
How related:
Threat actors with ties to China have been attributed to a novel campaign that compromised an ArcGIS system and turned it into a backdoor for more than a year.
About this happening:
ArcGIS server was compromised and turned into a backdoor for more than a year, exposing the environment to long-term unauthorized access. Attackers used a portal...
ArcGIS system / public-facing ArcGIS server hit by data theft breach
IncidentHow related: Threat actors with ties to China have been attributed to a novel campaign that compromised an ArcGIS system and turned it into a backdoor for more than a year.
About this happening: ArcGIS server was compromised and turned into a backdoor for more than a year, exposing the environment to long-term unauthorized access. Attackers used a portal...
ArcGIS SOE web shell and SoftEther VPN Bridge persistence analysis
Technical Analysis
H score33
First: 14.10.2025 15:28
Last: 14.10.2025 15:28
Sources 1
How related:
The researchers found the threat actors established year-long access to the organization by modifying ArcGIS' Java server object extension (SOE), which allows users to create service operations for maps and images, and turning the component into a Web shell.
About this happening:
ArcGIS server extensions were turned into a stealthy web shell, enabling long-lived internal access and persistence beyond the portal. The intrusion matters because the operat...
ArcGIS SOE web shell and SoftEther VPN Bridge persistence analysis
Technical AnalysisHow related: The researchers found the threat actors established year-long access to the organization by modifying ArcGIS' Java server object extension (SOE), which allows users to create service operations for maps and images, and turning the component into a Web shell.
About this happening: ArcGIS server extensions were turned into a stealthy web shell, enabling long-lived internal access and persistence beyond the portal. The intrusion matters because the operat...
Timeline
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14.10.2025 15:00 3 articles · 9mo ago
Flax Typhoon ArcGIS web-shell persistence campaign disclosed
Technical Analysis UpdateReliaQuest attributed Flax Typhoon to a campaign against a legitimate public-facing ArcGIS application, saying the actors modified the ArcGIS server’s Java server object extension (SOE) to behave as a web shell, compromised an administrator account, invoked REST operations through the public portal, sent a malicious GET request with a base64-encoded payload and hardcoded key, uploaded a renamed SoftEther VPN executable for long-term access, persisted the malicious SOE in the victim’s backups after remediation and patching, and targeted two workstations within the scanned subnet belonging to IT staff.
Show sources
- Chinese Hackers Use Trusted ArcGIS App For Year-Long Persistence — www.infosecurity-magazine.com — 14.10.2025 15:00
- Chinese Hackers Use Trusted ArcGIS App For Year-Long Persistence — www.infosecurity-magazine.com — 14.10.2025 15:00
- China's Flax Typhoon Turns Geo-Mapping Server into a Backdoor — www.darkreading.com — 15.10.2025 00:12