Threats Tagged 'fileless malware'

A malicious npm package named 'node-fetch-utils' was discovered masquerading as a legitimate fetch helper utility. The package declares a remote tarball dependency from GitHub that executes upon installation. It runs an obfuscated postinstall script targeting Windows systems, which downloads a bundled Python runtime and drops it as Microsoft\EdgeBroker\pythonw.exe for persistence. The dropper then uses this disguised runtime to execute a fileless Python implant decrypted in memory and launched hidden via wscript. The dropper scripts self-delete while the disguised runtime remains active on the compromised system, establishing command and control communications.

A Chinese APT group compromised a Philippine military company using a new, fileless malware framework called EggStreme. This sophisticated multi-stage toolset achieves persistent, low-profile espionage by injecting malicious code directly into memory and leveraging DLL sideloading. The core component, EggStremeAgent, is a full-featured backdoor enabling extensive system reconnaissance, lateral movement, and data theft via an injected keylogger. The attack begins with EggStremeFuel deploying EggStremeLoader to set up a persistent service, which then executes EggStremeReflectiveLoader to launch EggStremeAgent. The framework's fileless nature and use of legitimate Windows processes make it difficult to detect, posing a significant and persistent threat.

MediumCampaignPhilippinesUnited KingdomFrance+3#eggstremefuel#eggstremereflectiveloader#stowaway

A sophisticated variant of the Masslogger credential stealer malware has been identified spreading through .VBE files. This multi-stage fileless malware heavily relies on Windows Registry to store and execute its malicious payload. The infection begins with a .VBE file, likely distributed via spam email or drive-by downloads. The malware sets up registry keys for storing commands, stager configurations, and the final payload. It establishes persistence through a scheduled task and uses techniques to simulate user input. The malware employs multiple stagers to decode and load the final Masslogger payload, which is injected into the AddInProcess32.exe process. The payload targets multiple web browsers and email clients to steal credentials and sensitive information, with capabilities including keylogging, screen capture, and data exfiltration via FTP, SMTP, or Telegram.

MediumCampaignGermanyFranceUnited Kingdom+4#persistence#process hollowing#vbscript