Blog - RH-ISAC

Security teams don’t just need alerts, they need answers. At Stairwell, we’ve seen how easily malware evades detection when defenders rely solely on behavior, logs, or static IOCs. Some threats hide inside image files. Others remain dormant for months. Many are missed not because they’re advanced, but because no one was looking in the right…

Executive Summary A widespread, opportunistic data theft campaign against Salesforce, attributed to the group UNC6395, has expanded in scope beyond initial reports. The attacks leverage compromised OAuth tokens from Salesloft Drift, an AI chat agent, to gain unauthorized access to customer instances of various services, including Salesforce and Google Workspace. Cybersecurity firms Zscaler and Palo Alto Networks have publicly confirmed impact,…

Executive Summary UK-based telecom provider Colt Technology Services has been battling a cyberattack since August 12, 2025, which disrupted several of its support and online platforms for days. Initially described as a “technical issue,” the company later confirmed it was a cyber incident and that customer data was stolen. The WarLock ransomware group has claimed responsibility,…

Executive Summary Since November 2024, IBM X-Force has been tracking QuirkyLoader, a new malware loader actively used to deliver a variety of well-known payloads, including keyloggers and Remote Access Trojans (RATs). This multi-stage infection begins with a malicious email attachment that exploits dynamic-link library (DLL) side-loading to execute a hidden malicious DLL. The loader, consistently written…

Executive Summary Proofpoint discovered a widespread phishing campaign leveraging fake Microsoft OAuth applications to bypass multifactor authentication (MFA) and harvest Microsoft 365 credentials. The attackers impersonated reputable brands like RingCentral, Adobe, SharePoint, and DocuSign, by luring victims into approving minimal‑privilege access. Even if MFA was declined, victims were redirected through CAPTCHA and a phishing page using…