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Cybersecurity researchers have disclosed details of a new dual-vector campaign that leverages stolen credentials to deploy legitimate Remote Monitoring and Management (RMM) software for persistent remote access to compromised hosts. "Instead of deploying custom viruses, attackers are bypassing security perimeters by weaponizing the necessary IT tools that administrators trust," KnowBe4 Threat Labs researchers Jeewan Singh Jalal, Prabhakaran Ravichandhiran, and Anand Bodke said . "By stealing a 'skeleton key' to the system, they turn legitimate Remote Monitoring and Management (RMM) software into a persistent backdoor." The attack unfolds in two distinct waves, where the threat actors leverage fake invitation notifications to steal victim credentials, and then leverage those pilfered credentials to deploy RMM tools to establish persistent access. The bogus emails are disguised as an invitation from a legitimate platform called Greenvelope, and aim to tri...

Microsoft has warned of a multi‑stage adversary‑in‑the‑middle ( AitM ) phishing and business email compromise (BEC) campaign targeting multiple organizations in the energy sector. "The campaign abused SharePoint file‑sharing services to deliver phishing payloads and relied on inbox rule creation to maintain persistence and evade user awareness," the Microsoft Defender Security Research Team said . "The attack transitioned into a series of AitM attacks and follow-on BEC activity spanning multiple organizations." As part of post-exploitation activity following initial compromise, the unknown attackers have been found to leverage trusted internal identities from the victim to carry out large‑scale intra‑organizational and external phishing in an effort to cast a wide net and widen the scope of the campaign. The starting point of the attack is a phishing email likely sent from an email address belonging to a trusted organization, which was compromised beforehand. A...

Cybersecurity researchers have disclosed details of a new ransomware family called Osiris that targeted a major food service franchisee operator in Southeast Asia in November 2025. The attack leveraged a malicious driver called POORTRY as part of a known technique referred to as bring your own vulnerable driver (BYOVD) to disarm security software, the Symantec and Carbon Black Threat Hunter Team said. It's worth noting that Osiris is assessed to be a brand-new ransomware strain, sharing no similarities with another variant of the same name that emerged in December 2016 as an iteration of the Locky ransomware. It's currently not known who the developers of the locker are, or if it's advertised as a ransomware-as-a-service (RaaS). However, the Broadcom-owned cybersecurity division said it identified clues that suggest the threat actors who deployed the ransomware may have been previously associated with INC ransomware (aka Warble). "A wide range of living off...

A critical security flaw has been disclosed in the GNU InetUtils telnet daemon ( telnetd ) that went unnoticed for nearly 11 years. The vulnerability, tracked as CVE-2026-24061 , is rated 9.8 out of 10.0 on the CVSS scoring system. It affects all versions of GNU InetUtils from version 1.9.3 up to and including version 2.7. "Telnetd in GNU Inetutils through 2.7 allows remote authentication bypass via a '-f root' value for the USER environment variable," according to a description of the flaw in the NIST National Vulnerability Database (NVD). In a post on the oss-security mailing list, GNU contributor Simon Josefsson said the vulnerability can be exploited to gain root access to a target system - The telnetd server invokes /usr/bin/login (normally running as root) passing the value of the USER environment variable received from the client as the last parameter. If the client supply [sic] a carefully crafted USER environment value being the string "-f root...

Most of this week’s threats didn’t rely on new tricks. They relied on familiar systems behaving exactly as designed, just in the wrong hands. Ordinary files, routine services, and trusted workflows were enough to open doors without forcing them. What stands out is how little friction attackers now need. Some activity focused on quiet reach and coverage, others on timing and reuse. The emphasis wasn’t speed or spectacle, but control gained through scale, patience, and misplaced trust. The stories below trace where that trust bent, not how it broke. Each item is a small signal of a larger shift, best seen when viewed together. Spear-phishing delivers custom backdoor Operation Nomad Leopard Targets Afghanistan Government entities in Afghanistan have been at the receiving end of a spear-phishing campaign dubbed Operation Nomad Leopard that employs bogus administrative documents as decoys to distribute a backdoor named FALSECUB by means o...