All news with #persistence tag

🛡️ Kaspersky researcher Lisandro Ubiedo details an expanding Windows-focused botnet named Tsundere that retrieves and executes arbitrary JavaScript from remote command-and-control servers. The threat, active since mid‑2025, has been distributed via fake MSI installers and PowerShell scripts that deploy Node.js, install dependencies (ws, ethers, and pm2) and establish persistence. Operators fetch WebSocket C2 addresses from an Ethereum smart contract to rotate infrastructure, while a control panel enables artifact building, bot management, proxying, and an on-platform marketplace.

🛡️ Bitdefender researchers describe how the Russia-aligned APT group Curly COMrades enabled Windows Hyper-V to deploy a minimal Alpine Linux VM on compromised Windows 10 hosts, creating a hidden execution environment. The compact VM (≈120MB disk, 256MB RAM) hosted two libcurl-based implants, CurlyShell (reverse shell) and CurlCat (HTTP-to-SSH proxy), enabling C2 and tunneling that evaded many host EDRs. Attackers used DISM and PowerShell to enable and run the VM under the deceptive name "WSL," and also employed PowerShell and Group Policy for credential operations and Kerberos ticket injection. Bitdefender warns that VM isolation can bypass EDR and recommends layered defenses including host network inspection and proactive hardening.

🔒 Attackers are deploying a persistent backdoor using OpenSSH and a customized Tor hidden service to target defense-related organizations in Russia and Belarus. The Operation SkyCloak campaign uses weaponized ZIP attachments and LNK-triggered PowerShell stagers that perform sandbox evasion and write an .onion hostname into the user's roaming profile. Persistence is established via scheduled tasks that run a renamed sshd.exe and a bespoke Tor binary using obfs4, enabling SSH, SFTP, RDP and SMB access over Tor.

⚠️ Researchers at Varonis have identified a turnkey remote access trojan called Atroposia, marketed on underground forums with subscription tiers starting at $200 per month. The kit combines advanced features — hidden remote desktop takeover, encrypted C2 channels, UAC bypass for persistence, an integrated vulnerability scanner, clipboard capture, DNS hijacking and bulk exfiltration — into a low‑skill, plug‑and‑play package. Enterprises should prioritize behavioral monitoring, rapid containment, multi‑factor authentication, restricted admin access and rigorous patching to detect and mitigate attacks enabled by such commoditized toolsets.

🛡️ Researchers disclosed a campaign, Operation Zero Disco, that exploited a recently patched SNMP stack overflow (CVE-2025-20352) in Cisco IOS and IOS XE devices to deploy Linux rootkits on older, unprotected switches. The attackers achieved remote code execution and persistence by installing hooks into IOSd memory and setting universal passwords that include the string "disco." Targets included legacy 3750G and 9300/9400 series devices lacking EDR protections.

🔒 Researchers at ReliaQuest found China-linked APT Flax Typhoon modified an ArcGIS Server Object Extension (SOE) into a persistent web shell that executed base64-encoded commands via standard ArcGIS operations. The actor used a hardcoded key, staged tools in a hidden C:\Windows\System32\Bridge directory, and renamed a SoftEther VPN binary to bridge.exe to maintain covert connectivity. The malicious SOE was replicated into backups and golden images, allowing access to survive system recovery while attackers performed discovery, credential harvesting, lateral movement, and covert VPN-based persistence.

🛡️ReliaQuest attributes a campaign to China-linked group Flax Typhoon that compromised a public-facing ArcGIS server by converting a Java Server Object Extension (SOE) into a gated web shell, maintaining access for over a year. The attackers embedded a hard-coded key and hid the backdoor in system backups to survive full system recovery. They uploaded a renamed SoftEther executable (bridge.exe), created a "SysBridge" service to persist, and used an outbound HTTPS VPN bridge to extend the victim network for covert lateral movement. Investigators observed credential theft, admin account resets, and extensive living-off-the-land activity to evade detection.

🔒 Eclypsium discovered that Framework shipped signed UEFI shells containing a dangerous mm (memory modify) command that can directly read and write system RAM and be leveraged to disable Secure Boot. By overwriting the gSecurity2 security handler pointer to NULL or redirecting it to a stub that always returns success, the mm command stops signature verification and can permit bootkits to load. Framework estimates roughly 200,000 affected units; users should apply available firmware and DBX updates, restrict physical access, or temporarily remove Framework's DB key in BIOS until patches are applied.

⚠️ Researchers at Eclypsium warn that roughly 200,000 Framework Linux systems shipped with legitimately signed UEFI shells containing a dangerous mm (memory modify) command. The command can read and write physical memory and be used to overwrite the gSecurity2 pointer that enforces UEFI signature checks, effectively disabling verification. That failure allows persistent bootkits to load at boot time and survive OS reinstalls. Framework is issuing firmware and DB/DBX updates; users should apply patches or follow temporary mitigations until fixes are available.

🔒 Researchers say a Chinese state-linked actor, likely Flax Typhoon, exploited a component of the ArcGIS geo-mapping platform to maintain undetected access for over a year. Using valid admin credentials, the attackers uploaded a malicious Java SOE that acted as a web shell, accepting base64-encoded commands via a REST parameter protected by a hardcoded secret. They then installed SoftEther VPN as a Windows service to create an outbound HTTPS tunnel to 172.86.113[.]142 on port 443, enabling persistent lateral movement and credential harvesting even if the SOE were removed.

🔐 ReliaQuest linked the campaign to the Flax Typhoon APT, which converted a legitimate public-facing ArcGIS Java server object extension (SOE) into a stealthy web shell. The group activated the SOE through a standard ArcGIS REST extension, embedding a base64-encoded payload and a hardcoded key to trigger command execution while hiding activity behind normal portal operations. Attackers uploaded a renamed SoftEther VPN binary to preserve access and targeted IT workstations, and the SOE was later found in backups, enabling persistence after remediation. ReliaQuest warns organisations to go beyond IOC detection, proactively hunt for anomalous behaviour in trusted tools, and treat every public-facing application as a high-risk asset.

🛡️ FortiGuard Labs reports that the long-running cyber-espionage group Confucius has shifted tactics against Microsoft Windows users, moving from document stealers like WooperStealer to Python-based backdoors such as AnonDoor. The change, observed between December 2024 and August 2025, favors persistent access and command execution over simple data exfiltration. Researchers describe layered evasion and persistence techniques including DLL side-loading, obfuscated PowerShell, scheduled tasks and stealthy exfiltration to minimize detection. Targeting remains focused in South Asia, particularly Pakistan.

🔍 Microsoft Threat Intelligence describes a new XCSSET variant that infects Xcode projects and expands capabilities to include clipboard hijacking, Firefox data theft, and additional persistence via LaunchDaemon entries. The actor uses run-only compiled AppleScripts, AES-based encryption, and layered obfuscation to evade analysis. A bnk submodule monitors and can replace wallet addresses in the clipboard while a new Mach-O binary targets Firefox data. Organizations are advised to patch promptly, inspect Xcode project sources, and deploy Microsoft Defender for Endpoint.

🔐 Chinese state-linked actors deployed a custom Linux/BSD backdoor called BRICKSTORM on network edge appliances to maintain persistent access into U.S. legal, technology, SaaS and outsourcing firms. These implants averaged 393 days of undetected dwell time and were used to pivot to VMware vCenter/ESXi hosts, Windows systems, and Microsoft 365 mailboxes. Mandiant and Google TAG attribute the activity to UNC5221 and have released a scanner and hunting guidance to locate affected appliances.

🔒 Proofpoint reported that a China-aligned threat actor tracked as TA415 conducted spear-phishing in July–August 2025, impersonating U.S. policy officials and the U.S.-China Business Council to target government, think tank, and academic personnel focused on trade and economic policy. The messages delivered password-protected archives on public cloud services that contained a Windows shortcut which executed a hidden batch script and an obfuscated Python loader named WhirlCoil while displaying a decoy PDF. The loader establishes a VS Code Remote Tunnel to enable persistent backdoor access, harvests system and user data, exfiltrates it via base64-encoded HTTP posts to free request-logging services, and establishes scheduled tasks (e.g., GoogleUpdate) for persistence.

⚠️ Cybersecurity researchers disclosed a campaign that abuses ConnectWise ScreenConnect remote sessions to deliver a fileless loader which ultimately executes the AsyncRAT remote-access trojan. Attackers use hands-on-keyboard activity to run a layered VBScript and PowerShell chain that loads obfuscated .NET assemblies and spawns AsyncClient.exe. Persistence is maintained via a scheduled task disguised as "Skype Updater," and stolen credentials, keystrokes, and wallet artifacts are exfiltrated to a DuckDNS command-and-control host.

🔒 FortiGuard Labs has uncovered MostereRAT, a Remote Access Trojan targeting Microsoft Windows that uses layered evasion and persistence techniques. Written in Easy Programming Language, the malware deploys a multi-stage chain, uses mutual TLS for C2 communication, and can disable Windows Update and antivirus processes. The campaign, aimed largely at Japanese users, begins with phishing emails that lead to a malicious Word download and installs services running at SYSTEM-level, while deploying remote access tools such as AnyDesk and TightVNC.

🔐 Mandiant observed attackers exploiting a zero‑day ViewState deserialization flaw (CVE-2025-53690) in legacy Sitecore deployments that reused a sample ASP.NET machineKey. Adversaries delivered a WeepSteel reconnaissance backdoor to collect system and network data and disguised exfiltration as normal ViewState traffic. Sitecore advises replacing and encrypting static machineKey values and instituting regular key rotation to mitigate further risk.