Apr 07, 2025Ravie LakshmananMalware / Network Security Cybersecurity agencies from Australia, Canada, New Zealand, and the United States have published a joint advisory about the risks associated with a technique called fast flux that has been adopted by threat actors to obscure a command-and-control (C2) channel. "'Fast flux' is a technique used to obfuscate the locations of … [Read more...] about CISA and FBI Warn Fast Flux is Powering Resilient Malware, C2, and Phishing Networks
Malware
North Korean Hackers Deploy BeaverTail Malware via 11 Malicious npm Packages
The North Korean threat actors behind the ongoing Contagious Interview campaign are spreading their tentacles on the npm ecosystem by publishing more malicious packages that deliver the BeaverTail malware, as well as a new remote access trojan (RAT) loader. "These latest samples employ hexadecimal string encoding to evade automated detection systems and manual code audits, … [Read more...] about North Korean Hackers Deploy BeaverTail Malware via 11 Malicious npm Packages
Microsoft Warns of Tax-Themed Email Attacks Using PDFs and QR Codes to Deliver Malware
Microsoft is warning of several phishing campaigns that are leveraging tax-related themes to deploy malware and steal credentials. "These campaigns notably use redirection methods such as URL shorteners and QR codes contained in malicious attachments and abuse legitimate services like file-hosting services and business profile pages to avoid detection," Microsoft said in a … [Read more...] about Microsoft Warns of Tax-Themed Email Attacks Using PDFs and QR Codes to Deliver Malware
Polyglot technique for disguising malware
Not long ago, our Securelist blog published a post (Russian language only) about an attack on industrial enterprises using the PhantomPyramid backdoor, which our experts with a high degree of confidence attribute to the Head Mare group. The attack was fairly standard — an email claiming to contain confidential information, with an attached password-protected archive containing … [Read more...] about Polyglot technique for disguising malware
RESURGE Malware Exploits Ivanti Flaw with Rootkit and Web Shell Features
Mar 30, 2025Ravie LakshmananVulnerability / Zero-Day The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has shed light on a new malware called RESURGE that has been deployed as part of exploitation activity targeting a now-patched security flaw in Ivanti Connect Secure (ICS) appliances. "RESURGE contains capabilities of the SPAWNCHIMERA malware variant, … [Read more...] about RESURGE Malware Exploits Ivanti Flaw with Rootkit and Web Shell Features
YouTube Game Cheats Spread Arcane Stealer Malware to Russian-Speaking Users
Mar 20, 2025Ravie LakshmananMalware / Threat Analysis YouTube videos promoting game cheats are being used to deliver a previously undocumented stealer malware called Arcane likely targeting Russian-speaking users. "What's intriguing about this malware is how much it collects," Kaspersky said in an analysis. "It grabs account information from VPN and gaming clients, and all … [Read more...] about YouTube Game Cheats Spread Arcane Stealer Malware to Russian-Speaking Users
Next-Generation Malware Classification Using Binary Transformers
CrowdStrike researchers have developed a next-gen method to train byte-based Transformer blocks that help models “understand” malware files rather than rely on detecting the presence of markersDuring testing, Binary Transformers significantly outperformed traditionally trained models in differentiating between benign and malicious code samplesThe results demonstrate the … [Read more...] about Next-Generation Malware Classification Using Binary Transformers
Silver Fox APT Uses Winos 4.0 Malware in Cyber Attacks Against Taiwanese Organizations
Feb 27, 2025Ravie LakshmananMalware / Threat Intelligence A new campaign is targeting companies in Taiwan with malware known as Winos 4.0 as part of phishing emails masquerading as the country's National Taxation Bureau. The campaign, detected last month by Fortinet FortiGuard Labs, marks a departure from previous attack chains that have leveraged malicious game-related … [Read more...] about Silver Fox APT Uses Winos 4.0 Malware in Cyber Attacks Against Taiwanese Organizations
New Malware Campaign Uses Cracked Software to Spread Lumma and ACR Stealer
Feb 24, 2025Ravie LakshmananEndpoint Security / Vulnerability Cybersecurity researchers are warning of a new campaign that leverages cracked versions of software as a lure to distribute information stealers like Lumma and ACR Stealer. The AhnLab Security Intelligence Center (ASEC) said it has observed a spike in the distribution volume of ACR Stealer since January 2025. A … [Read more...] about New Malware Campaign Uses Cracked Software to Spread Lumma and ACR Stealer
North Korean Hackers Target Freelance Developers in Job Scam to Deploy Malware
Freelance software developers are the target of an ongoing campaign that leverages job interview-themed lures to deliver cross-platform malware families known as BeaverTail and InvisibleFerret. The activity, linked to North Korea, has been codenamed DeceptiveDevelopment, which overlaps with clusters tracked under the names Contagious Interview (aka CL-STA-0240), DEV#POPPER, … [Read more...] about North Korean Hackers Target Freelance Developers in Job Scam to Deploy Malware