A new malware campaign has been discovered on the Python Package Index (PyPI) involving malicious 'spellchecker' packages. These packages contain a heavily obfuscated, multi-layer encrypted backdoor designed to steal cryptocurrency wallets from infected systems. The threat actors leverage the popularity of Python packages to distribute this malware, targeting developers and users who install these packages. Although no known exploits in the wild have been reported yet, the campaign poses a medium-level risk due to the potential financial impact and the stealthy nature of the backdoor. The malware's multi-layer encryption complicates detection and analysis, increasing the risk of prolonged undetected compromise. European organizations using Python environments for development or automation, especially those involved with cryptocurrency, are at risk. Mitigation requires proactive package vetting, enhanced monitoring for suspicious package behavior, and restricting installation of unverified packages. Countries with significant Python developer communities and active cryptocurrency sectors, such as Germany, the UK, France, and the Netherlands, are more likely to be affected. Given the threat's impact on confidentiality and the ease of exploitation via package installation, the suggested severity is medium.
NotDoor is a backdoor malware leveraging Outlook macros for persistence and lateral movement within compromised environments. It stages files in C:\ProgramData and abuses DLL sideloading via OneDrive.exe to evade detection. The malware executes encoded PowerShell commands, modifies registry keys to enable macros and disable security dialogs, and uses Outlook functions for command-and-control (C2) communication and email monitoring. Detection strategies include monitoring suspicious PowerShell activity, registry changes, and the creation of VbaProject. OTM files by non-Outlook processes. The threat is linked to the APT28 (Fancy Bear) actor and represents a medium-severity risk. European organizations using Microsoft Outlook and OneDrive are potential targets, especially those in critical infrastructure and government sectors. Mitigation requires focused monitoring, macro policy enforcement, and DLL sideloading prevention measures.
The Lazarus Group, a DPRK-linked threat actor, has launched a targeted espionage campaign against aerospace and defense sectors using a new variant of the Comebacker backdoor. The attack employs spear phishing with highly specific lure documents to deliver macro-based malware. The infection chain is multi-staged, featuring custom decryption algorithms and encrypted command-and-control communications, indicating advanced evasion techniques. The campaign infrastructure remains active, suggesting ongoing operations. This threat poses risks to confidentiality and integrity of sensitive defense-related information. European aerospace and defense organizations should enhance phishing defenses and monitor for indicators such as specific file hashes and suspicious domains. No CVSS score is assigned, but the threat is assessed as high severity due to its targeted nature, potential impact, and sophisticated malware. Countries with significant aerospace and defense industries and geopolitical interest in DPRK activities are most at risk. Immediate mitigation includes user training, macro restrictions, network monitoring, and threat intelligence sharing.
A Russia-linked advanced persistent threat (APT) group named InedibleOchotense is impersonating the cybersecurity vendor ESET to deploy a backdoor malware on Ukrainian systems. This campaign involves social engineering tactics to trick victims into trusting malicious payloads disguised as legitimate ESET software or communications. The backdoor enables persistent unauthorized access, potentially allowing espionage, data exfiltration, or further network compromise. Although currently observed targeting Ukraine, the threat poses risks to organizations in Europe due to geopolitical tensions and shared infrastructure. The attack does not require known exploits but relies on deception and malware delivery. Mitigation requires enhanced email and software supply chain verification, network monitoring for unusual activity, and user awareness training. Countries with close ties to Ukraine or high adoption of ESET products are at elevated risk. The threat severity is assessed as medium given the targeted nature, potential impact on confidentiality and integrity, and moderate ease of exploitation through impersonation without zero-day exploits.
The Cavalry Werewolf hacking group has deployed a new backdoor malware named ShellNET targeting a Russian government organization. This backdoor enables persistent unauthorized access and remote control over compromised systems. Although currently reported with minimal discussion and no known exploits in the wild, the malware represents a medium-severity threat due to its potential for espionage and disruption. European organizations should be aware of this threat given geopolitical tensions and possible targeting of allied or related infrastructure. Mitigation requires enhanced network monitoring for unusual outbound connections, strict access controls, and threat hunting focused on backdoor indicators. Countries with strong intelligence, government, and critical infrastructure sectors, especially those with close ties or adversarial relations involving Russia, are more likely to be affected. The threat is assessed as medium severity due to the targeted nature, lack of widespread exploitation, and moderate impact potential. Defenders must prioritize detection and containment to prevent lateral movement and data exfiltration.
The SesameOp backdoor malware abuses the OpenAI Assistants API to gain remote access to compromised systems. This novel technique leverages legitimate AI service APIs as a covert communication channel, complicating detection and mitigation efforts. Although no known exploits in the wild have been reported yet, the backdoor's use of a trusted API could allow attackers to bypass traditional network defenses. The threat is currently assessed as medium severity due to the potential for unauthorized remote control without requiring user interaction, but with limited evidence of widespread exploitation. European organizations using OpenAI services or integrating AI assistants into their infrastructure may be at risk, especially those in technology, finance, and critical infrastructure sectors. Mitigation requires monitoring unusual API usage patterns, restricting API keys, and implementing strict network segmentation. Countries with high AI adoption and digital infrastructure, such as Germany, France, the UK, and the Netherlands, are more likely to be targeted. Defenders should prioritize detection of anomalous outbound traffic to AI service endpoints and enforce least privilege principles on API credentials.
Operation SkyCloak is a recently identified cyber threat involving a Tor-enabled OpenSSH backdoor targeting defense sector organizations. The backdoor leverages Tor to anonymize command and control communications, complicating detection and attribution. Although no known exploits are currently active in the wild, the malware's design suggests a focus on stealthy, persistent access to sensitive defense infrastructure. The threat is considered high severity due to its potential impact on confidentiality and integrity within critical defense environments. European defense organizations are at risk, especially those with extensive OpenSSH deployments and strategic defense roles. Mitigation requires advanced network monitoring for Tor traffic, strict SSH access controls, and enhanced endpoint detection capabilities. Countries with significant defense industries and NATO membership are likely primary targets. Given the complexity and stealth of this backdoor, the suggested severity is high. Defenders should prioritize detection of anomalous Tor usage and review SSH configurations to prevent unauthorized backdoor implantation.
The HttpTroy backdoor is a newly identified malware posing as a VPN invoice, used in targeted cyberattacks primarily against South Korean entities. This backdoor enables attackers to maintain persistent unauthorized access, potentially exfiltrating sensitive data or facilitating further network compromise. Although currently observed mainly in South Korea, the malware’s disguise as legitimate VPN-related communication could allow it to spread to other regions, including Europe, especially where VPN usage is prevalent. The threat is considered high severity due to its stealthy nature, targeted approach, and potential impact on confidentiality and integrity. There are no known public exploits or patches yet, complicating immediate defense. European organizations should be vigilant, particularly those with business ties to South Korea or heavy VPN usage. Mitigation requires enhanced email filtering, user awareness training focused on phishing and invoice fraud, network monitoring for unusual outbound connections, and endpoint detection capabilities tuned to detect backdoor behaviors. Countries with strong economic or technological links to South Korea and high VPN adoption rates are at greater risk. Given the malware’s ability to bypass typical defenses by masquerading as legitimate traffic and the lack of authentication barriers, the threat severity is assessed as high.
North Korean threat actors Kimsuky and Lazarus have deployed new sophisticated malware toolsets named HttpTroy and an upgraded BLINDINGCAN variant. HttpTroy is a backdoor delivered via a VPN invoice-themed attack, involving a dropper and loader (MemLoad), granting extensive system control. Lazarus's upgraded BLINDINGCAN is delivered through a new Comebacker malware variant, targeting victims in Canada. Both toolsets use advanced obfuscation, stealth techniques, and layered evasion to avoid detection. These attacks highlight DPRK's evolving cyber espionage capabilities. Although currently observed targeting South Korea and Canada, European organizations could be at risk due to geopolitical tensions and similar attack methodologies. No known exploits in the wild have been reported yet. Mitigation requires targeted detection of these toolsets, network monitoring for associated indicators, and enhanced endpoint defenses. The threat is assessed as medium severity due to its espionage focus, stealth, and complexity, but limited current scope and no public CVSS score.
The Baohuo Android backdoor is a newly identified malware that targets Telegram users by masquerading as a fake Telegram X app. It hijacks Telegram accounts by exploiting user trust in the fake app, potentially allowing attackers to access private communications and perform unauthorized actions. This malware is distributed through deceptive channels and does not require known exploits or vulnerabilities in Telegram itself. The threat is currently assessed as medium severity due to its impact on confidentiality and account integrity, combined with the need for user interaction to install the fake app. European organizations with employees or users relying on Telegram for communication could face risks of data leakage and account compromise. Mitigation involves user education on app authenticity, restricting app installations from untrusted sources, and monitoring for suspicious account activity. Countries with high Telegram usage and significant digital communication infrastructure, such as Germany, France, and the UK, are more likely to be affected. Given the malware’s backdoor capabilities and account hijacking potential, vigilance is essential to prevent unauthorized access and data breaches.
The Bitter APT group is leveraging an old WinRAR vulnerability combined with malicious Office files to deploy new backdoor attacks. This threat involves exploitation of legacy software flaws to gain initial access and then use weaponized Office documents to establish persistence and control. Although no known exploits in the wild have been confirmed, the attack vector is notable due to the use of widely deployed software and common attack techniques. The medium severity rating reflects moderate impact potential, considering the age of the vulnerability and the complexity of the attack chain. European organizations using outdated WinRAR versions and handling Office documents are at risk, especially those in sectors targeted by APT groups. Mitigation requires patching or removing vulnerable WinRAR versions, enhancing email filtering, and applying strict macro and attachment policies. Countries with high usage of WinRAR and significant exposure to APT activity, such as Germany, France, and the UK, are more likely to be affected. The threat's exploitation complexity and lack of authentication requirements suggest a medium severity level. Defenders should prioritize detection of suspicious Office files and monitor for unusual backdoor activity linked to this campaign.
COLDRIVER, a Russian state-sponsored threat group, swiftly shifted operations after their LOSTKEYS malware was exposed in May 2025. They developed new malware families, including NOROBOT, YESROBOT, and MAYBEROBOT, within days. The infection chain begins with a COLDCOPY lure disguised as a CAPTCHA, leading to the deployment of NOROBOT, a DLL that retrieves subsequent stages. YESROBOT, a Python backdoor, was briefly used before being replaced by MAYBEROBOT, a more flexible PowerShell backdoor. The malware chain has undergone constant evolution, with COLDRIVER focusing on evading detection while maintaining intelligence collection capabilities against high-value targets. The group's tactics include using HTTPS for command retrieval, encrypting commands, and implementing various evasion techniques.
A new . NET-based backdoor leveraging Windows Cryptographic API (CAPI) has been identified targeting Russian automotive and e-commerce companies. The malware is distributed via phishing emails containing ZIP attachments, which when opened, deploy the backdoor enabling remote code execution (RCE). Although currently focused on Russian firms, the technique and malware could potentially spread to other regions. The backdoor abuses . NET capabilities and CAPI functions to evade detection and maintain persistence. No known public exploits or patches exist yet, and the threat is considered high severity due to its RCE capabilities and targeted nature. European organizations with business ties or supply chains linked to Russian auto or e-commerce sectors should be vigilant. Mitigation requires enhanced email filtering, user training against phishing, and monitoring for unusual . NET process behavior and cryptographic API usage.
A spear-phishing campaign targeting the Russian Automobile-Commerce industry using a malicious.NET implant has been uncovered by Seqrite Labs Research Team and is now being investigated by the FBI.
A new malvertising campaign is distributing fake Microsoft Teams installers that deploy the Oyster backdoor, also known as Broomstick. This malware enables attackers to maintain persistent unauthorized access to infected systems. The campaign leverages deceptive advertising to trick users into downloading and executing malicious installers masquerading as legitimate Teams software. Although no known exploits are reported in the wild yet, the threat poses a medium severity risk due to its potential for espionage and data exfiltration. European organizations using Microsoft Teams are at risk, especially those with less stringent software verification processes. Attackers could leverage this backdoor to compromise confidentiality and integrity of sensitive information. Mitigation requires user education, strict verification of software sources, and enhanced endpoint detection capabilities. Countries with high Teams adoption and strategic sectors such as finance and government are more likely to be targeted. The threat is assessed as medium severity given the malware’s capabilities, delivery method, and lack of required user interaction beyond initial installation.
The WARMCOOKIE backdoor continues to evolve, with ongoing updates and new infections observed. Recent developments include new handlers for executing various file types, a string bank for defense evasion, and code optimizations. A campaign ID field has been added, providing context for operators. Infrastructure analysis reveals a default SSL certificate potentially used for WARMCOOKIE back-ends. Despite disruption attempts, the backdoor remains active in malvertising and spam campaigns. The malware's selective usage and continuous updates suggest its persistence as a threat, highlighting the need for enhanced organizational protection measures.
Ukraine Warns of CABINETRAT Backdoor + XLL Add-ins Spread via Signal ZIPs
Source: https://thehackernews.com/2025/10/ukraine-warns-of-cabinetrat-backdoor.html
The Phantom Extension: Backdooring chrome through uncharted pathways
Source: https://www.synacktiv.com/en/publications/the-phantom-extension-backdooring-chrome-through-uncharted-pathways
North Korean Hackers Use New AkdoorTea Backdoor to Target Global Crypto Developers
Source: https://thehackernews.com/2025/09/north-korean-hackers-use-new-akdoortea.html
