Anti-virus software (AV software) is a type of computer software that tries to identify malicious software and to prevent it from running. Since anti-virus software may wrongfully identify harmless files as malicious (false positives), AV software makes use of quarantining files. If a file is put into quarantine by an AV software, the AV software removes the original suspected malicious file and stores a modified obfuscated version in another location.
In this paper, the quarantine files of different AV software solutions were analyzed. The encryption and obfuscation methods were documented (including encryption keys) and parsers created using Kaitai Struct.
Get the latest news about technical topics within the IT-Security Community and a lot of special insights. Sign up now for our Newsletter at ernw.de:
In the last blog post, we discussed the full authentication flow using Windows Hello for Business (WHfB) with face recognition to authenticate against an Active Directory with Kerberos and showcased existing and new vulnerabilities. In this blog post, we dive into the architectural challenges WHfB faces and explore how we can exploit them.
Many Linux hardening guides focus on well-known protections: full-disk encryption, Secure Boot, and password-protected bootloaders. While these measures are critical, they often overlook a subtle but serious attack vector: the ability to drop into a debug shell via the Initial RAM Filesystem (initramfs). This oversight can enable an attacker with brief physical access to bypass […]
Important note: Some media coverage on this topic falsely or inaccurately depicts the attack conditions. To be clear: Any vulnerable device can be compromised if the attacker is in Bluetooth range. That is the only precondition. During our research on Bluetooth headphones and earbuds, we identified several vulnerabilities in devices that incorporate Airoha Systems on […]
Windows Hello for Business is a key component of Microsoft’s passwordless authentication strategy. It enables user authentication not only during system sign-in but also in conjunction with new and advanced features such as Personal Data Encryption, Administrator Protection, and Recall. Rather than depending on traditional passwords, Windows Hello leverages a PIN or biometric methods – […]
The X11 Window System has been used since September 1987 for Unix desktop systems, allowing applications to display their windows. Today, one of the server implementations of the protocol is the X.Org X server and XWayland, which both use the same codebase. While reviewing the X server, several legacy security issues were identified. These appear […]