NewApp Digest
search bot

backdoor

Top antivirus hacked to push out a malicious update - find out if you're affected
Tech Optimizer
January 29, 2026

Top antivirus hacked to push out a malicious update – find out if you’re affected

Recent reports indicate that the antivirus program eScan experienced a security breach, leading MicroWorld Technologies to conduct an internal investigation. A threat actor exploited compromised update servers to distribute malware to users who downloaded updates during a two-hour window on January 20, 2026. The exact number of affected users is unknown, but the company has isolated the compromised infrastructure and refreshed credentials while assisting impacted users. The eScan product itself was not altered, and the victims were limited to a specific regional cluster. The malware, identified as CONSCTLX, operates as a backdoor and downloader, allowing attackers to maintain access and execute commands on infected devices. The identity of the attackers is unknown, but North Korean cybercriminals previously exploited eScan's update mechanism in 2024. MicroWorld Technologies has provided support to millions of customers but has not disclosed the total number of eScan users.
PDFSIDER Malware Actively Used by Threat Actors to Bypass Antivirus and EDR Defenses
Tech Optimizer
January 19, 2026

PDFSIDER Malware Actively Used by Threat Actors to Bypass Antivirus and EDR Defenses

PDFSIDER is a sophisticated backdoor malware that bypasses modern endpoint detection and response systems. It is distributed through targeted spear-phishing campaigns that exploit vulnerabilities in legitimate PDF software. The malware is delivered via spear-phishing emails containing ZIP archives with a trojanized executable disguised as the PDF24 App. When executed, it uses DLL side-loading to load a malicious DLL (cryptbase.dll) alongside the legitimate PDF24.exe, allowing attackers to execute code without detection. PDFSIDER establishes encrypted command-and-control channels using the Botan 3.0.0 cryptographic library with AES-256 in GCM mode and operates mainly in memory to minimize detectable artifacts. It collects system information and executes commands through hidden cmd.exe processes. The malware employs advanced techniques to evade detection in sandbox and virtual machine environments, including checks for available RAM and debugger presence. Indicators of compromise include the malicious file cryptbase.dll and various clean files associated with the legitimate PDF24 application. Organizations are advised to enforce strict controls on executable files, provide user awareness training, and monitor DNS queries and encrypted traffic to detect PDFSIDER communications. The malware's behavior aligns with tactics used in state-sponsored espionage rather than financially motivated cybercrime.
China-Aligned Threat Group Uses Windows Group Policy to Deploy Espionage Malware
Winsage
December 18, 2025

China-Aligned Threat Group Uses Windows Group Policy to Deploy Espionage Malware

A newly identified cyber threat cluster called LongNosedGoblin has been linked to cyber espionage attacks targeting governmental entities in Southeast Asia and Japan, with activities traced back to at least September 2023. The group uses Group Policy to spread malware and employs cloud services like Microsoft OneDrive and Google Drive for command and control. Key tools include NosyHistorian, NosyDoor, NosyStealer, NosyDownloader, and NosyLogger, which perform functions such as collecting browser history, executing commands, and logging keystrokes. ESET first detected LongNosedGoblin's activities in February 2024, identifying malware on a governmental system. The attacks showed a targeted approach, with specific tools affecting select victims. Additionally, a variant of NosyDoor was found targeting an organization in an EU country, indicating a possible connection to other China-aligned threat groups.
Warning! Engineered Linux Malware Can Bypass Next-Gen Anti-Virus Solutions - Open Source For You
Tech Optimizer
December 9, 2025

Warning! Engineered Linux Malware Can Bypass Next-Gen Anti-Virus Solutions – Open Source For You

The author created a custom reverse TCP payload using Python, packaged it into an .elf executable, and tested its stealthiness against antivirus software. The payload included functionalities such as webcam snapshots, keylogging, screen capture, and file transfers. Established tools for obfuscation often triggered antivirus alerts, prompting the author to develop a custom solution to avoid signature-based detection, maintain behavioral control, and gain insights into detection engines. The payload was designed to connect back to the attacker's machine and execute commands, while the listener processed incoming data. After compiling the binary, it was submitted to VirusTotal, where only four out of 64 antivirus engines flagged it, indicating that custom code can bypass many next-gen antivirus products.
Fileless protection explained: Blocking the invisible threat others miss
Tech Optimizer
December 3, 2025

Fileless protection explained: Blocking the invisible threat others miss

Fileless malware operates within a computer's active memory, avoiding detection by traditional antivirus solutions that rely on file scanning. It uses legitimate tools like PowerShell to execute harmful commands without creating files, making it difficult to identify. Cybercriminals can use fileless malware for various malicious activities, including data theft and cryptocurrency mining. Malwarebytes combats fileless attacks through two defense layers: Script Monitoring, which intercepts potentially dangerous scripts at execution, and Command-Line Protection, which scrutinizes command-line tools for suspicious activities. Examples of fileless attacks include malicious email attachments activating PowerShell to download ransomware, hidden JavaScript on websites mining cryptocurrency, and attackers using Windows Management Instrumentation (WMI) to create backdoors. Malwarebytes' Fileless Protection operates automatically in the background, ensuring legitimate applications function normally while monitoring for threats. It is part of a comprehensive security framework that includes machine-learning detection and web protection, designed to stop attacks that do not write files. This protection is included with Malwarebytes Premium, aimed at safeguarding personal and small business systems.
Hackers Using RMM Tools LogMeIn and PDQ Connect to Deploy Malware as Legitimate Software
Tech Optimizer
November 13, 2025

Hackers Using RMM Tools LogMeIn and PDQ Connect to Deploy Malware as Legitimate Software

Cybersecurity researchers at AhnLab Security Intelligence Center (ASEC) have discovered an attack campaign that uses legitimate Remote Monitoring and Management (RMM) tools, specifically LogMeIn Resolve and PDQ Connect, to deploy backdoor malware on users' systems. Attackers lure victims to fake download sites that mimic legitimate software pages for utilities like Notepad++, 7-Zip, and VLC Media Player, delivering modified versions of LogMeIn Resolve. The malicious installers are disguised with filenames such as "notepad++.exe" and "chatgpt.exe." Once executed, these files install the RMM tool and additional malware capable of stealing sensitive information. ASEC has identified three CompanyId values associated with the attacks: 8347338797131280000, 1995653637248070000, and 4586548334491120000. The malware, known as PatoRAT, is a Delphi-developed backdoor that gathers system information and has extensive malicious capabilities, including keylogging and remote desktop access. Users are advised to download software only from official websites and verify digital signatures, while organizations should monitor for unauthorized RMM installations and the identified indicators of compromise.
Search