All news with #persistence tag

🛡️ Cybersecurity researchers disclosed a novel Go-based loader called HollowFrame and a Rust backdoor family named Matryoshka, revealed after a phishing intrusion against a law firm. The attack begins with an encrypted archive containing a malicious LNK that triggers a staged chain, uses DLL side-loading with a rogue python311.dll, weakens Defender, and establishes persistence via scheduled tasks. Matryoshka variants communicate over HTTP or via a GitHub-based C2 to receive commands, exfiltrate data, and deliver secondary payloads.

🔍 This Huntress investigation examines a June intrusion that began via an SQL injection on a public web page. The attacker performed reconnaissance, enabled RDP, created an admin account, disabled Windows Defender, and installed backdoors and malicious IIS modules. They also deployed a hidden cryptocurrency miner and used silent PowerShell scripts to persist and evade detection. The report highlights why fixing the root cause is as important as removing attacker tools.

🛡️ Fortinet researchers uncovered a TrickBot variant that abandons HTTP for a custom DNS tunneling C2 channel, embedding encrypted commands and payloads within malformed DNS queries. The modular malware uses single-byte XOR encoding, hex-encoding and 63-character domain chunking for outbound beacons, while inbound data hides in multiple IPv4 addresses returned by resolvers. Persistence relies on Windows Task Scheduler with NTFS ADS, and command handling retains prior modular capabilities for executing modules, DLLs, PowerShell and shellcode.

🔒 Researchers report that DragonForce operators covertly used Microsoft Teams TURN relay servers to mask command-and-control traffic while infiltrating a major US services firm during a 2025 campaign. The attackers deployed a Go-based RAT, named Backdoor.Turn, which obtained anonymous Teams visitor tokens and established QUIC sessions to attacker-controlled servers. They also exploited an undocumented Huawei driver vulnerability and modified system settings to maintain persistence, exfiltrate data and deploy DragonForce ransomware.

🛡️ Volexity researchers attribute prolonged intrusions to the Chinese espionage group UNC5221 (aka VerdantBamboo), which used the Brickstorm backdoor plus previously undocumented malware Plenet and AgentPSD to maintain access. The actor compromised an MSP and victim systems, remaining undetected for at least 18 months and returning after remediation. Plenet is a cross-platform .NET backdoor; AgentPSD is a Python reverse shell used as fallback persistence.

🛡️ Cisco patched a high-severity SSRF in Unified Communications Manager, while Russia reported large-scale mobile spyware targeting officials and ongoing investigations. Threat actors continue to distribute VIP Keylogger via layered social engineering and JavaScript loaders, and DriveSurge operates a widespread malware delivery network using ClickFix and FakeUpdates. U.S. sanctions hit major Iranian crypto exchanges; RMM and trusted tools are increasingly abused for persistence and privilege escalation.

🛡️ReliaQuest researchers observed ClickFix intrusions that now leverage the open-source proxy PySoxy to establish a secondary encrypted C2 path alongside an initial PowerShell controller. The April campaign used scheduled tasks for persistence and deployed Python tooling to C:\ProgramData to execute compiled .pyc modules, turning endpoints into proxy relays. This dual-channel design preserves access if the PowerShell channel is disrupted, forcing broader containment and new hunting approaches.

🔐 ReliaQuest researchers describe a campaign where social-engineering ClickFix techniques were paired with the decade-old Python SOCKS5 proxy PySoxy to maintain persistent access on compromised hosts. Attackers staged the proxy after reconnaissance and used a scheduled task for re-execution, so blocking the initial ClickFix vector did not fully remove access. Analysts advise treating these incidents as active compromises and hunting for Python proxy artifacts, scheduled tasks, and staged components rather than assuming a blocked C2 equals containment.

🔐 Researchers disclosed a new Linux backdoor called PamDOORa, advertised on the Russian cybercrime forum Rehub by an actor named "darkworm". The PAM-based post-exploitation toolkit provides persistent OpenSSH access via a magic password and specific TCP port and can harvest credentials for all users who authenticate through the compromised host. Flare.io says the implant also includes anti-forensic features to tamper with authentication logs and evasion techniques. The seller listed it at $1,600 in March 2026, later reducing the price to about $900.

🛡️ A sustained phishing campaign named Venomous#Helper is abusing signed remote monitoring and management (RMM) tools to install persistent backdoors on Windows hosts. Researchers at Securonix say attackers used SSA-branded lures that redirected via a compromised Mexican domain to a signed JWrapper binary masquerading as a government document. The payload deploys a cracked SimpleHelp build alongside a ConnectWise ScreenConnect relay, creating dual access channels and robust persistence mechanisms that evade basic gateway and EDR checks.

🐍 Securonix has identified a stealthy Python-based backdoor, Deep#Door, that uses an obfuscated batch loader to install a persistent implant on Windows systems. The self-contained dropper embeds and reconstructs its Python payload at runtime, disables security controls such as Windows Defender, and leverages multiple persistence mechanisms to maintain access. It uses public TCP tunneling for C2 and supports credential theft, keylogging, media capture and optional destructive actions, complicating detection and remediation.

🛡️ Securonix researchers disclosed a stealthy Python-based backdoor named DEEP#DOOR that establishes persistent access and extensive surveillance on compromised Windows hosts. Delivered via an obfuscated batch dropper, the implant extracts and runs an embedded svc.py payload and uses the public Rust-based tunneling service bore.pub for command-and-control. Its capabilities include remote shells, credential and key theft, webcam and audio capture, and robust anti-analysis measures.

🛡️ Security teams are being urged to inspect Cisco ASA and Firepower devices following discovery of a resilient backdoor called Firestarter that can persist after patching and survive normal reboots. CISA and the UK’s NCSC recommend generating a core dump and running their published YARA rules (or scanning a disk image) to detect the implant. If an infection is confirmed, the advisory states the device must be physically disconnected from all power sources, including redundant and backup supplies, for at least one minute or be fully reimaged — a standard reboot or power cycle is not sufficient.

🔥 A custom backdoor named Firestarter has been observed persisting on Cisco Firepower and Secure Firewall devices running ASA or FTD software, surviving reboots, firmware updates, and security patches. U.S. CISA and the U.K. NCSC link the activity to a threat actor tracked as UAT-4356, which exploited CVE-2025-20333 and CVE-2025-20362. Cisco recommends reimaging and upgrading affected devices; administrators can check compromise with show kernel process | include lina_cs, and CISA published YARA rules and mitigation guidance.

🔒 CISA and the U.K. NCSC disclosed that a federal civilian agency's Cisco Firepower device running ASA firmware was compromised in September 2025 by a persistent backdoor dubbed FIRESTARTER. The ELF bootkit alters the startup mount list and attempts to hook LINA to execute arbitrary shellcode and sustain post-patching persistence. Cisco recommends reimaging; a cold power cycle is a temporary mitigation.

⚠ Microsoft has alerted to a late-February 2026 campaign that uses WhatsApp messages to deliver malicious Visual Basic Script (VBS) files which trigger a multi-stage infection chain. According to Microsoft Defender, the scripts create hidden folders under C:\ProgramData, drop renamed Windows utilities (for example, curl.exe as netapi.dll and bitsadmin.exe as sc.exe), and retrieve secondary payloads from trusted cloud providers. Attackers then attempt UAC tampering, modify registry entries, and install unsigned MSI packages to secure persistence and remote access, with some installers deploying legitimate remote‑access tools.

🛡️ Microsoft warns of a WhatsApp-distributed malware campaign that uses malicious Visual Basic Script (VBS) files to gain persistence and remote access on Windows systems. The VBS scripts perform delayed, multi-stage execution and deploy renamed legitimate utilities (for example, curl.exe and bitsadmin.exe) under misleading filenames to blend in. Payloads are hosted on reputable cloud providers and culminate in installing malicious Microsoft Installer (MSI) packages that act as backdoors. Microsoft recommends monitoring script and installer execution and watching for misuse of trusted system tools.

🔒 Kubernetes clusters can be undermined by the very automation that makes them resilient. By registering or compromising a controller—most commonly via a MutatingWebhookConfiguration—an attacker can intercept pod-creation requests and inject a covert sidecar, turning the cluster’s control loop into a self-healing backdoor. These injections are often invisible to casual inspection, survive pod restarts and upgrades, and can be disguised under benign names. Teams should audit webhooks, monitor RoleBindings and OwnerReferences, and restrict webhook registration to reduce this risk.

🔒 A long-running espionage campaign attributed to China-linked threat cluster Red Menshen has embedded stealthy kernel-level implants into telecom networks to maintain persistent, low-noise access. Rapid7 highlights BPFDoor, a Linux backdoor that leverages Berkeley Packet Filter functionality to trigger shells only when a specifically crafted "magic" packet is seen, avoiding open listeners and conventional C2 channels. The actor also deploys CrossC2, Sliver, TinyShell, credential harvesting tools and a controller that can operate inside victim environments to enable lateral movement and covert monitoring.

🐉 Silver Dragon is a China-nexus cyber espionage group focusing on government ministries and public sector organizations across Southeast Asia, with additional victims identified in Europe. The group gains access through exploitation of public-facing servers and targeted phishing campaigns. It maintains long-term persistence by hijacking legitimate Windows services and deploying a custom backdoor, GearDoor, which uses Google Drive for covert C2, blending malicious activity with trusted services to evade detection.