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Mallory pivots from this family to the IOCs, detections, and named campaigns that touch your stack, and pages you when something new lands.
10 CVEs Mallory has correlated with this family across public research and vendor advisories. Each row links to the full Mallory page for that vulnerability.
The main backdoor, a file named down.php, was heavily obfuscated, four layers deep, and appears to be derived from an open-source Chinese webshell called BestShell.
The main backdoor, a file named down.php, was heavily obfuscated, four layers deep, and appears to be derived from an open-source Chinese webshell called BestShell.
the Joomla JCE bug (CVE-2026-48907) is a maximum-severity flaw CISA has added to its Known Exploited Vulnerabilities list ... Treat the Joomla JCE flaw (CVE-2026-48907, fixed in 2.9.99.5) as urgent too | The main backdoor, a file named down.php, was heavily obfuscated, four layers deep, and appears to be derived from an open-source Chinese webshell called BestShell.
The main backdoor, a file named down.php, was heavily obfuscated, four layers deep, and appears to be derived from an open-source Chinese webshell called BestShell.
The main backdoor, a file named down.php, was heavily obfuscated, four layers deep, and appears to be derived from an open-source Chinese webshell called BestShell.
The biggest producer was a bug in the Breeze caching plugin (CVE-2026-3844), which the crew fired at more than 45,000 targets and, by its own count, backdoored over 17,000 of them. | The main backdoor, a file named down.php, was heavily obfuscated, four layers deep, and appears to be derived from an open-source Chinese webshell called BestShell.
The main backdoor, a file named down.php, was heavily obfuscated, four layers deep, and appears to be derived from an open-source Chinese webshell called BestShell.
The main backdoor, a file named down.php, was heavily obfuscated, four layers deep, and appears to be derived from an open-source Chinese webshell called BestShell.
The main backdoor, a file named down.php, was heavily obfuscated, four layers deep, and appears to be derived from an open-source Chinese webshell called BestShell.
The main backdoor, a file named down.php, was heavily obfuscated, four layers deep, and appears to be derived from an open-source Chinese webshell called BestShell.
6 distinct techniques documented for this family, organized by ATT&CK tactic.
4 indicators attributed across vendor reports, sandbox runs, and researcher write-ups. Full values are available in Mallory.
IPs, domains, and DNS infrastructure linked to this family.
File hashes (MD5, SHA-1, SHA-256) from samples and reports.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An open-source Chinese webshell used as the basis for the campaign's main backdoor. The deployed webshell could manage files, run commands, open reverse shells, scan the network, and check which security software the host was running.
Open-source webshell framework cited as the apparent basis/evolutionary predecessor of down.php, supporting extensive file management, command execution, proxying, SQL operations, and post-exploitation features.
Match every observed IP, domain, and hash against your live telemetry.
Named campaigns wielding this family, with evidence pinned to each claim.
CVEs this family uses for access and lateral movement.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Every documented technique, ranked by evidence weight.
Reddit, Mastodon, and CTI community discussion around this family.