Threat actors exploited Cloudflare's free-tier infrastructure and Python environments to deploy AsyncRAT, demonstrating advanced evasion techniques. The attack begins with phishing emails containing Dropbox links to malicious files. It uses legitimate Python downloads and sophisticated code injection targeting explorer.exe. The campaign ensures persistence through multiple vectors, including startup folder scripts and WebDAV mounting. It abuses trusted infrastructure like Cloudflare to mask activities and evade detection. The attackers employ social engineering tactics, such as displaying legitimate PDF documents, to reduce suspicion. This campaign highlights the trend of abusing cloud services for malware delivery and execution, emphasizing the need for multi-layered security approaches.
ASEC discovered Guloader malware being distributed through phishing emails masquerading as employee performance reports. The emails, claiming to be about October 2025 performance, contain a RAR file with an NSIS executable named 'staff record pdf.exe'. This file is actually Guloader malware, which downloads and executes shellcode from a Google Drive URL. The final payload is Remcos RAT, enabling threat actors to perform various malicious remote control activities, including keylogging, screenshot capture, webcam and microphone control, and browser data extraction. The attackers are increasingly using legitimate platforms as C2 servers, making detection more challenging. Users are advised to exercise caution when opening emails from unknown sources and to change passwords regularly to prevent secondary damage.
A sophisticated campaign by the Chinese APT group Silver Fox is targeting Indian entities with authentic-looking Income Tax phishing lures. The attack leverages a complex kill chain involving DLL hijacking and the modular Valley RAT to ensure persistence. The campaign uses a multi-stage infection process, starting with a malicious email containing a PDF decoy. The payload is delivered through an NSIS installer, which drops a legitimate Thunder.exe binary and a malicious libexpat.dll for DLL hijacking. The final stage involves the Valley RAT, which uses a two-stage configuration loading mechanism and implements a 3-tier C2 communication loop. The RAT's modular plugin architecture allows for dynamic capability extension and persistence through registry-based storage.
This analysis reveals connections between three seemingly distinct malicious programs: AppSuite, OneStart, and ManualFinder. The investigation uncovers shared server infrastructure and similar installation patterns, indicating that these programs are likely created by the same threat actor. OneStart, initially a browser based on Chromium, evolved from earlier versions that used node.exe to run malicious JavaScript. The actors behind these programs have been active for years, distributing malware disguised as various utilities such as games, recipe finders, and manual finders. The report highlights the adaptability of these threat actors, who easily morph their software to take new forms and evade detection.
A new infection chain for GOLD BLADE's RedLoader malware has been identified, combining previously separate techniques. The attack begins with a malicious PDF link, leading to a ZIP archive containing a LNK file masquerading as a PDF. This file executes conhost.exe, which uses WebDAV to contact a CloudFlare domain and remotely sideload a malicious DLL. The infection progresses through two stages of RedLoader, ultimately establishing command and control communication. This updated method, observed in July 2025, demonstrates the threat actors' ability to adapt and bypass defenses by combining known techniques in novel ways.
A sophisticated spear phishing campaign has been identified, distributing the VIP keylogger through email attachments. The malware is delivered via a ZIP file containing a malicious executable disguised as a PDF. Once executed, an AutoIt script drops two encrypted files, which are then decrypted and injected into RegSvcs.exe using process hollowing techniques. The VIP keylogger is designed to steal sensitive information by logging keystrokes, capturing credentials from popular web browsers, and monitoring clipboard activity. The campaign employs obfuscation techniques and maintains persistence through a VBS script in the Startup folder. The final payload exfiltrates data through SMTP and communicates with a command and control server.
A buffer overflow vulnerability exists in PDF Shaper versions 3.5 and 3.6 when converting a crafted PDF file to an image using the 'Convert PDF to Image' functionality. An attacker can exploit this vulnerability by tricking a user into opening a maliciously crafted PDF file, leading to arbitrary code execution under the context of the user. This vulnerability has been verified on Windows XP, 7, 8, and 10 platforms using the PDFTools.exe component.
