Today, Microsoft has released its monthly set of security advisories for vulnerabilities that have been identified and addressed in various products. This month’s advisory release addresses 74 new vulnerabilities, with 14 of them rated critical and 59 of them rated important. These vulnerabilities impact Internet Explorer, Edge, Exchange, Scripting Engine, Windows Shell and more.
Gozi ISFB is a well-known and widely distributed banking trojan, and has been in the threat landscape for the past several years. Banking trojans are a widely distributed type of malware that attackers leverage in an attempt to obtain banking credentials from customers of various financial institutions. The source code associated with Gozi ISFB has been leaked several times over the years, and the robust features available within the Gozi ISFB code base have since been integrated into additional malware, such as GozNym. Talos published detailed research about GozNym in a September 2016 blog post. Talos has been monitoring Gozi ISFB activity since then, and has discovered a series of campaigns over the past six month that have been making use of the elusive “Dark Cloud” botnet for distribution. In investigating the infrastructure associated with Dark Cloud, we identified a significant amount of malicious activity making use of this same infrastructure, including Gozi ISFB distribution, Nymaim command and control, and a variety of different spam campaigns and scam activity. Talos is publishing details related to ongoing Gozi ISFB activity, the Dark Cloud botnet, as well as the additional threats we have observed using this infrastructure over the past couple of years.
Talos is disclosing several vulnerabilities identified in Simple DirectMedia Layer’s SDL2_Image library that could allow code execution. Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. It is used by video playback software, emulators, and popular games including Valve’s award winning catalog and many Humble Bundle games. SDL officially supports Windows, Mac OS X, Linux, iOS, and Android. Support for other platforms may be found in the source code. The SDL2_Image library is an optional component for SDL that deals specifically with parsing and displaying a variety of image file formats, creating a single and uniform API for image processing, regardless of the type. Simple DirectMedia Layer has released a new version of sdl image, 2.0.3 to address this issue, which can be downloaded here. Talos recommends installing this update as quickly as possible on affected systems.
Today, Cisco Talos is disclosing a single out-of-bounds read vulnerability in the Dovecot IMAP server. Dovecot is a popular internet message access protocol, or IMAP, server with performance and security-oriented design. It is a popular choice for robust email servers. In accordance with our coordinated disclosure policy, Talos has worked with Dovecot to ensure that this issue has been resolved. Dovecot has released version 2.2.34 to address this issue. Talos recommends installing this update as quickly as possible on affected systems.
Malware continues to evolve in different ways and forms, one of which is the language it is written in, from Visual C++, to Powershell, almost everything has been used to develop malware. Today, we will focus on a remote access trojan, otherwise known as a RAT, written entirely in Python and wrapped into a standalone executable.
Talos identified samples of two different versions of this RAT, both versions (3.0 and 4.0 according to the information within the samples analyzed) were written using Python and packed into an executable using a common tool called py2exe. The malware main script bytecode is stored in a portable executable (PE) section called PYTHONSCRIPT, while the Python DLL is stored in a section called PYTHON27.DLL. All the remaining modules’ bytecode is compressed and stored in the executable overlay.
Both versions have all the usual RAT capabilities, however, during our investigation it became clear that version 4.0 (the latest) is a stripped-down version, where some features were removed, as explained later, to be part of a targeted campaign.
The target of such campaign are the users of INESAP – Instituto Nacional Escola Superior da Administração Pública, which is a Brazilian public sector management school that also does consulting work.
Absent contributions from traditional intelligence capacities, the available evidence linking the Olympic Destroyer malware to a specific threat actor group is contradictory, and does not allow for unambiguous attribution. The threat actor responsible for the attack has purposefully included evidence to frustrate analysts and lead researchers to false attribution flags. This false attribution could embolden an adversary to deny an accusation, publicly citing evidence based upon false claims by unwitting third parties. Attribution, while headline grabbing, is difficult and not an exact science. This must force one to question purely software-based attribution going forward.