The PolySwarm Blog

Analyze suspicious files and URLs, at scale, millions of times per day. Get real-time threat intel from a crowdsourced network of security experts and antivirus companies competing to protect you.

CastleLoader

Aug 8, 2025 11:51:37 AM / by The Hivemind posted in Threat Bulletin, Phishing, Redline, Emerging Threat, PowerShell, StealC, ClickFix, CastleLoader, GitHub, DeerStealer, malware loader, NetSupport RAT

0 Comments

Verticals Targeted: Government
Regions Targeted: US
Related Families: StealC, RedLine, NetSupport RAT, DeerStealer, HijackLoader, SectopRAT

Executive Summary

CastleLoader, a versatile malware loader, has infected 469 devices since May 2025, leveraging Cloudflare-themed ClickFix phishing and fake GitHub repositories to deliver information stealers and RATs. Its sophisticated attack chain, high infection rate, and modular design make it a significant threat to organizations, particularly U.S. government entities.

Read More

BERT Ransomware

Jul 11, 2025 2:02:09 PM / by The Hivemind posted in Threat Bulletin, Europe, REvil, Healthcare, Asia, Babuk, Technology, Emerging Threat, PowerShell, Evolving Threat, Event Services, United States, BERT ransomware

0 Comments

Verticals Targeted: Healthcare, Technology
Regions Targeted: Asia, Europe, United States
Related Families: REvil, Babuk

Read More

New Lumma C2 Variant Leverages PowerShell

Sep 16, 2024 2:58:00 PM / by The Hivemind posted in Threat Bulletin, Infostealer, CAPTCHA, Lumma C2, PowerShell

0 Comments

Executive Summary

A new Lumma C2 variant that leverages PowerShell was recently observed. The new variant’s attack chain masquerades as CAPTCHA and actively exploits PowerShell commands.

Read More
All posts

Subscribe to Email Updates

Lists by Topic

see all

Posts by Topic

See all

Recent Posts

Join the Marketplace

For Enterprises and Businesses

Learn More

For Security Experts and AV Companies

Learn More