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Fox Kitten is an Iranian threat actor active since at least 2017 and widely tracked under aliases including Pioneer Kitten, Rubidium, Lemon Sandstorm, UNC757, Parisite, and Br0k3r. The actor has been linked to Iranian government-aligned operations while also pursuing financially motivated activity, including selling or sharing access to compromised networks with ransomware affiliates and supporting extortion operations. Fox Kitten has also been tied to the Pay2Key ransomware operation and to collaboration with affiliates associated with AlphV, NoEscape, and Ransomhouse. The group is known for targeting internet-facing edge infrastructure and then using that foothold for prolonged post-compromise operations. Reported initial access tradecraft includes mass scanning and exploitation of known vulnerabilities in remote access and application delivery products such as Citrix NetScaler, Pulse Secure VPN, F5 BIG-IP, Ivanti, Check Point, and Palo Alto Networks appliances. After gaining access, Fox Kitten has maintained persistence for extended periods using web shells, scheduled tasks, reverse proxies, tunneling tools, and remote administration utilities. Masquerading and defense evasion have included naming artifacts to resemble legitimate system components and using Base64-encoded payloads and scripts. Post-compromise activity includes credential theft, privilege escalation, reconnaissance, lateral movement, and data collection. Fox Kitten has accessed credential material from files, repeatedly targeted stored secrets, dumped LSASS memory, accessed NTDS data through volume shadow copies, and read user registry hives such as ntuser.dat and UserClass.dat. Discovery behavior has included use of Angry IP Scanner to identify remote systems, WizTree to enumerate network files and directories, Softerra LDAP Browser to inspect service-account information, and Google Chrome bookmarks to identify internal resources and assets. The actor has also searched local systems for sensitive documents and browsed shared resources. Fox Kitten commonly moves laterally with legitimate administrative protocols and tools, including RDP, SMB, PsExec, SSH-related tooling, and VNC software, and has been assessed to have hijacked legitimate RDP sessions in some intrusions. Persistence mechanisms have included scheduled tasks and reverse proxy deployment. Collection activity has extended to local systems, network shares, collaboration platforms, and cloud storage resources, with staging and archiving prior to likely exfiltration. Victimology includes U.S. federal agencies and organizations in information technology, government, healthcare, financial services, insurance, media, education, and defense, as well as organizations in Israel, Azerbaijan, and the United Arab Emirates. The actor’s operations combine espionage-oriented access development and technical data theft with financially motivated access brokerage and ransomware enablement.
Mallory correlates actor tradecraft and target patterns against your stack, your sector, and your geography. See overlap before they land.
58 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
28 malware families attributed to this actor across reporting.
23 additional families tracked in Mallory.
21 CVEs this actor has used in observed campaigns. 21 of them exploited in the wild.
CISA and the FBI have observed the threat actor exploiting multiple CVEs, including CVE-2019-11510, CVE-2019-11539, CVE-2019-19781, and CVE-2020-5902.
CISA and the FBI have observed the threat actor exploiting multiple CVEs, including CVE-2019-11510, CVE-2019-11539, CVE-2019-19781, and CVE-2020-5902.
The threat actor primarily gained initial access by compromising a Citrix NetScaler remote access server using a publicly available exploit for CVE-2019-19781.
CISA and the FBI have observed the threat actor exploiting multiple CVEs, including CVE-2019-11510, CVE-2019-11539, CVE-2019-19781, and CVE-2020-5902.
This detection identifies instances where Windows Explorer.exe spawns PowerShell or cmd.exe processes, particularly focusing on executions initiated by LNK files. This behavior is associated with the ZDI-CAN-25373 Windows shortcut zero-day vulnerability, where specially crafted LNK files are used to trigger malicious code execution through cmd.exe or powershell.exe. This technique has been actively exploited by multiple APT groups in targeted attacks through both HTTP and SMB delivery methods.
16 more CVEs tied to this actor tracked in Mallory.
16 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.
Listed in annotations associated with the credential-access technique.
Listed as an associated threat actor in the detection annotation for exploitation of the public-facing PTC Windchill vulnerability CVE-2026-4681.
Listed in the detection annotations as a threat actor associated with this analytic context.
Listed as a threat actor associated with PowerShell execution behavior relevant to this detection.
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.