Summary: TRUeSentire’s Threat Response Unit has identified an advanced KoiLoader malware intrusion attempting to compromise systems through a phishing email. The attack leverages misleading file formats, manipulates PowerShell commands, and employs multiple anti-detection techniques to deploy the Koi Stealer for extensive data theft. KoiLoader exemplifies sophisticated malware engineering, utilizing custom cryptographic channels for Command and Control (C&C) operations.
Affected: Organizations susceptible to phishing attacks and malware infections
Keypoints :
- Intrusion begins with a phishing email containing a deceptive ZIP attachment.
- KoiLoader employs a Windows bug to conceal command arguments, launching hidden PowerShell commands.
- KoiStealer is designed to extract sensitive data, including saved passwords and browser information.
- Unique persistence mechanisms and anti-detection techniques make KoiLoader challenging to combat.
- TRU has released an emulation toolkit for researchers to simulate the malware’s C2 traffic.