The shellcode (SHA256: 64CC899EC85F612270FCFB120A4C80D52D78E68B05CAF1014D2FE06522F1E2D0) is considered to be a stager, or downloader, whose function is to download an implant from a C2 server. In the following sections, we provide an in-depth technical breakdown of each of these capabilities. Uses position independent code (PIC) to throw off static analysis tools.Encrypts or decrypts function blocks (code blocks) during runtime, as needed, to evade detection.Employs polymorphic code, changing its runtime footprint during code execution to thwart memory analysis and evade signaturing.Obscures its connection protocol by connecting to the C2 server over a common port (443), thereby blending in with normal SSL network traffic.Generates unique session keys for each connection to the C2 server.Clears the host’s DNS cache every time it attempts to connect to its C2 server, thereby requiring that the host resolve the current IP address for the malicious C2 domain each time.Leverages existing Windows registry key that is enabled by default in Windows 10 to store configuration data.Attempts to remain hidden from cybersecurity analysis by explicitly checking its environment for signs of debugging.This hardens the encryption of the network communication, as a single RC4 key will not decrypt the entire payload. Transmits payloads in modified RC4-encrypted chunks.A New Class of ShellcodeĪt a macro level, BendyBear is unique in that it: Palo Alto Networks customers can be protected from the attacks outlined in this blog with the Next-Generation Firewall alongside DNS Security, URL Filtering and WildFire security subscriptions, and Cortex XDR. ![]() It was discovered absent additional information regarding the exploit vector, potential victims or intended use. The sample analyzed in this blog was identified by its connections to a malicious C2 domain published by Taiwan's Ministry of Justice Investigation Bureau in August 2020. At 10,000+ bytes, BendyBear is noticeably larger than most, and uses its size to implement advanced features and anti-analysis techniques, such as modified RC4 encryption, signature block verification, and polymorphic code. Shellcode, despite its name, is used to describe the small piece of code loaded onto the target immediately following exploitation, regardless of whether or not it actually spawns a command shell. The BendyBear sample was determined to be 圆4 shellcode for a stage-zero implant whose sole function is to download a more robust implant from a command and control (C2) server. Due to the similarities with WaterBear, and the polymorphic nature of the code, Unit 42 named this novel Chinese shellcode “BendyBear.” It stands in a class of its own in terms of being one of the most sophisticated, well-engineered and difficult-to-detect samples of shellcode employed by an Advanced Persistent Threat (APT). The malware is associated with the cyber espionage group BlackTech, which many in the broader threat research community have assessed to have ties to the Chinese government, and is believed to be responsible for recent attacks against several East Asian government organizations. Analysis by Trend Micro and TeamT5 unveiled WaterBear as a multifaceted, stage-two implant, capable of file transfer, shell access, screen capture and much more. The code behavior and features strongly correlate with that of the WaterBear malware family, which has been active since as early as 2009. ![]() This is what Unit 42 researchers were met with during code analysis of this “bear” of a file. Release Names: CyberLink Screen Recorder Deluxe 4.Highly malleable, highly sophisticated and over 10,000 bytes of machine code. Multistream to Twitch, YouTube, Facebook and Custom Servers.Livestream to Twitch, YouTube and Facebook (Enhanced!).Screen Recorder couples the easy-to-use editing features of PowerDirector – The No.1 Choice for Video Editors – with responsive, high-quality screen casting and capturing technology, making it the all-in-one solution for recording or streaming gameplay, vlogging, or sharing screen content with an online audience. ![]() No longer do game casters and online content creators need to juggle multiple applications or services for multistreaming video, or editing desktop capture to publish on YouTube or Facebook. Enjoyĭescription: CyberLink Screen Recorder 4 delivers robust desktop capture and video streaming in a single application. P2p group has released the newest build of “CyberLink Screen Recorder Deluxe” for windows.
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