Threats Tagged 'systembc'

The Gentlemen is an active ransomware and extortion operation that emerged publicly in the second half of 2025, rapidly escalating into a high-volume threat actor. The group appears to be a continuation or reorganization of prior ransomware affiliate activity, with reported connections to the Qilin ecosystem and the Russian-speaking actor 'hastalamuerte.' This growth likely reflects existing ransomware experience, affiliate relationships, and access to established resources. Underground sources indicate attempts to sell data allegedly connected to The Gentlemen ransomware activity, though the available information lacks sufficient victim-specific or technical details to confirm authenticity. The operation utilizes SystemBC for command and control communications and deploys ransomware variants targeting both Windows and Linux systems.

The Gentlemen ransomware-as-a-service program has rapidly expanded since mid-2025, claiming over 320 victims with 240 attacks occurring in early 2026. The service provides multi-platform lockers for Windows, Linux, NAS, BSD, and ESXi, enabling comprehensive coverage of corporate environments. During an incident response engagement, an affiliate deployed SystemBC proxy malware for covert tunneling and payload delivery. Analysis of the SystemBC command-and-control server revealed a botnet of over 1,570 victims, primarily corporate and organizational targets. The intrusion progressed from domain controller compromise through credential validation, remote execution via administrative shares, and deployment of Cobalt Strike payloads. Attackers disabled defenses, established persistence through scheduled tasks and services, and ultimately deployed ransomware via Group Policy. The operation demonstrates sophisticated lateral movement capabilities, defense evasion techniques, and integration of mature post-exploit...

The German hosting provider aurologic GmbH has become a critical infrastructure hub for multiple high-risk and sanctioned cybercrime networks, including entities involved in disinformation and malware campaigns. Despite public scrutiny and sanctions, aurologic continues to provide upstream transit services, enabling threat actors to maintain operational stability. The provider's approach to abuse handling is reactive and legally compliant rather than proactive, allowing malicious infrastructure to persist. This situation highlights challenges in accountability within the hosting ecosystem and the risks posed by infrastructure neutrality when it enables cybercrime. Numerous suspicious domains linked to aurologic-hosted networks have been identified, associated with malware families and threat actor tools. European organizations, especially in Germany, face increased risks due to this infrastructure's stability and continued operation. Mitigation requires enhanced monitoring of traffic from these domains, collaboration with upstream providers, and pressure on hosting providers to adopt proactive abuse prevention. Countries with significant internet infrastructure and cybercrime targets in Europe are most likely to be affected.

MediumCampaignGermanyFranceNetherlands+3#castleloader#neutrality#systembc

A large-scale attack infrastructure dubbed TruffleNet has been identified, built around the open-source tool TruffleHog. This infrastructure is used to systematically test compromised credentials and perform reconnaissance across AWS environments. The campaign involves over 800 unique hosts across 57 distinct Class C networks, characterized by consistent configurations and the use of Portainer. Alongside TruffleNet, adversaries are exploiting Amazon Simple Email Service (SES) to facilitate Business Email Compromise (BEC) campaigns. The attackers create email identities using compromised WordPress sites and conduct aggressive cloud reconnaissance. This activity highlights the evolving tactics of threat actors in exploiting cloud infrastructure at scale, combining credential theft, reconnaissance automation, and SES abuse to conduct high-volume fraud with minimal detection.

MediumMalwareGermanyUnited KingdomFrance+7#identity compromise#trufflehog#credential abuse

The ransomware group Qilin has been highly active in 2025, publishing over 40 victim cases per month on its leak site. Manufacturing, professional services, and wholesale trade are the most affected sectors. Attackers likely originate from Eastern Europe or Russian-speaking regions. They use tools like Cyberduck for data exfiltration and leverage notepad.exe and mspaint.exe to view sensitive information. The attack flow includes initial VPN access, reconnaissance, credential theft, lateral movement, and ransomware deployment. Two encryptors are often used: one spread via PsExec and another targeting network shares. The ransomware encrypts files, deletes backups, and leaves ransom notes. Persistence is achieved through scheduled tasks and registry modifications.

MediumMalwareFranceGermanyItaly+6#manufacturing#ransomware#systembc

The SystemBC botnet, composed of over 80 C2s and 1,500 daily victims, primarily targets VPS systems from commercial providers. It creates proxies enabling high volumes of malicious traffic for various criminal threat groups. The network is used by multiple proxy services, including REM Proxy, which offers tiered packages for different cybercriminal needs. SystemBC's infrastructure allows for massive data transfers, with some bots generating over 16 GB of proxy data in 24 hours. The botnet is used for various malicious activities, including brute-forcing WordPress credentials, web-scraping, and supporting ransomware operations. The report highlights the evolving nature of proxy services in the cybercriminal ecosystem and their role in facilitating large-scale attacks.

MediumMalwareGermanyUnited KingdomFrance+4#icedid#vps#cybercrime

An intrusion began with a user downloading and executing a malicious file impersonating DeskSoft's EarthTime application, which deployed SectopRAT malware. The threat actor used multiple malware families, including SystemBC and Betruger, and various tools for reconnaissance and lateral movement. They moved across systems using RDP and Impacket's wmiexec, maintaining persistence through local account creation and startup folder shortcuts. Data was collected using WinRAR and exfiltrated via WinSCP to an FTP server. The discovery of tools linked to Play ransomware, DragonForce ransomware, and RansomHub suggests the threat actor was likely an affiliate operating across multiple ransomware groups.

MediumMalwareGermanyFranceUnited Kingdom+4#data exfiltration#grixba#systembc

This intelligence report details a sophisticated cyber intrusion with links to three major ransomware groups: Play, RansomHub, and DragonForce. The attack began with a malicious file impersonating DeskSoft's EarthTime application, which deployed SectopRAT malware. The threat actors used various tools for reconnaissance, lateral movement, and data exfiltration, including SystemBC, Betruger backdoor, AdFind, SharpHound, and Grixba. They leveraged RDP and Impacket's wmiexec for lateral movement, and used WinRAR and WinSCP for data collection and exfiltration. The intrusion lasted six days before the threat actors were evicted, showcasing a range of advanced persistent threat techniques and highlighting the blurred lines between different ransomware operations.

MediumCampaignGermanyFranceUnited Kingdom+5#data exfiltration#grixba#systembc

Interlock, a relatively new ransomware group first observed in September 2024, has gained prominence in 2025 as an opportunistic ransomware operator. Unlike traditional Ransomware-as-a-Service models, Interlock operates without affiliates or public advertisements. The group conducts double extortion campaigns, leveraging compromised websites and multi-stage social engineering techniques to deliver payloads. Interlock's attack chain involves initial access through fake software updaters, execution of PowerShell scripts, and the use of custom remote access trojans. The group has targeted various sectors across North America and Europe, including education, healthcare, technology, and government entities. Notable attacks include the DaVita breach in April 2025 and the ransomware attack on the city of St. Paul, Minnesota in July 2025.

MediumMalwareGermanyFranceUnited Kingdom+6#ransomware#social engineering#interlock rat

From September to December 2024, incidents involving CrossC2, an extension tool for Cobalt Strike Beacon on Linux, were confirmed. The attacker used CrossC2 along with other tools like PsExec, Plink, and Cobalt Strike to penetrate AD. A custom malware called ReadNimeLoader was used as a loader for Cobalt Strike. The campaign may have affected multiple countries. CrossC2 is an unofficial Beacon and builder compatible with Cobalt Strike 4.1+, designed for Linux and macOS. It contains anti-analysis features and encrypted configuration data. The attack flow involved java.exe, ReadNimeLoader, and OdinLdr to execute Cobalt Strike Beacon. Other tools used include SystemBC, GetNPUsers, and privilege escalation tools. The campaign shows potential connections to BlackBasta based on similar characteristics.

MediumMalwareGermanyFranceUnited Kingdom+7#readnimeloader#systembc#crossc2