Threats Tagged 'web shell'

The Head Mare APT group exploited two vulnerabilities in TrueConf video conferencing servers released since 2022 to deliver PhantomCore malware to conference participants. These vulnerabilities allowed attackers to execute arbitrary code, replace legitimate client installers with malicious versions, and deploy web shells. Infected installers deployed a backdoor granting attackers full control over infected systems. On Linux servers, additional backdoors used GitHub as a command and control channel. The vulnerabilities were patched in TrueConf server versions 5.3.9, 5.4.9, and 5.5.5 released in June 2026. Organizations with employees participating in TrueConf conferences may have been affected even without operating their own servers.

A previously unseen ransomware family named Spirals was deployed in a double extortion attack against an IT services company in South Asia in June 2026. The Rust-based payload demonstrated sophisticated capabilities including defense evasion, encryption, lateral movement, and privilege escalation. Attackers gained initial access through a compromised internet-facing IIS web server via an ASP.NET web shell, moving rapidly to deploy ransomware within 24 hours. They established persistence using multiple tunneling tools, disabled endpoint security, harvested credentials through SAM hive and LSASS dumps, and deployed reverse-SOCKS proxies for covert command-and-control. The ransomware was distributed across the network using PsExec, encrypting files with AES-128 keys and threatening data publication within six days. The skilled execution suggests potential for wider campaigns, though the threat actor remains unidentified.

Beginning in August 2025, a sophisticated intrusion was discovered where attackers used log poisoning techniques to deploy a web shell on vulnerable phpMyAdmin panels. The threat actors exploited misconfigured web applications to plant China Chopper web shells, controlled via AntSword, before deploying Nezha, an open-source monitoring tool, to facilitate remote command execution. This led to the deployment of Ghost RAT on compromised systems. Analysis revealed over 100 compromised machines, predominantly located in Taiwan, Japan, South Korea, and Hong Kong. The attackers demonstrated technical proficiency through multi-stage operations, utilizing AWS and VPS infrastructure, with indicators pointing to China-nexus threat actors. The campaign highlights increasing abuse of legitimate publicly available tools to achieve malicious objectives while maintaining plausible deniability.

MediumMalwareUnited StatesAngolaArgentina+46#phpmyadmin#gh0st rat#china-nexus

A sophisticated cyber intrusion campaign utilizing log poisoning and a new tool called Nezha has been uncovered. The attackers exploited a vulnerable phpMyAdmin interface to deploy a web shell, followed by the installation of Nezha, an open-source server monitoring tool repurposed for malicious activities. The campaign targeted over 100 victims, primarily in Taiwan, Japan, South Korea, and Hong Kong. The threat actors also deployed Ghost RAT, a remote access trojan, for further system compromise. The attack methodology and victimology suggest a China-nexus threat actor, highlighting the need for improved security measures and vigilance against emerging threats.

MediumMalwareGermanyFranceUnited Kingdom+4#log poisoning#nezha#web shell

Chinese cyberespionage group APT41 conducted a targeted attack against government IT services in Africa. The attackers used various tools including Impacket, Cobalt Strike, and custom malware for lateral movement, privilege escalation, and data exfiltration. They leveraged DLL sideloading techniques and a compromised SharePoint server as a command and control center. The attack involved credential harvesting, use of web shells, and custom stealers to collect sensitive data. Notable TTPs included using hardcoded internal service names and proxy servers in malware, and exploiting a captive SharePoint server for C2 communication. The incident highlights the importance of comprehensive infrastructure monitoring and proper access controls.

MediumMalwareFranceGermanyItaly+5#sharepoint#cobalt strike#checkout