Rapid7 tracked a set of Linux samples that blend into the software and device conventions of the telecom environments they target. The set spans a newly observed BPFDoor variant, a BPF Rekoobe build seen against South Korean targets, a dropper, and six builds of a Linux implant Rapid7 researchers track as AVERAT, deployed against Taiwanese appliances. Additionally, researchers provide source code details of the Rapid7 BPFDoor controller introduced in our April 2026 blog, Stealthy BPFDoor Variants are a Needle That Looks Like Hay.
The chain uses two binaries. A dropper writes a shell script to the appliance’s storage mount and executes it. The script stages both payloads into /sbin under the names ntpdate and udevds, launches them, and deletes each file ten seconds later while the processes continue running. One of those payloads is the dropper itself, re-executing as a resident watchdog, leaving both processes running without an on-disk image.
Read more…
Source: Rapid7 News
Sign up for the Cyber Security Review Newsletter
The latest cyber security news and insights delivered right to your inbox
Related:
- DDoS Attacks That Employ TCP Amplification Cause Network Congestion, Secondary Outages
November 14, 2019
Over the past month, threat actors have been using a relatively non-conventional approach to mount a flurry of distributed denial-of-service (DDoS) attacks: through TCP amplification. Security company Radware shared its observations on multiple campaigns involving Transmission Control Protocol (TCP) reflection attacks, specifically SYN-ACK reflection attacks, against companies across the world. The scope of the impact was ...
- McAfee antivirus software impacted by code execution vulnerability
November 12, 2019
Researchers have revealed a serious code execution vulnerability impacting all editions of McAfee software. On Tuesday, the SafeBreach Labs cybersecurity team said that CVE-2019-3648 can be used to bypass McAfee’s self-defense mechanisms, potentially leading to further attacks on a compromised system. The vulnerability exists due to a failure to validate whether or not loading DLLs have been signed, and a path ...
- Emotet resurgence packs in new binaries, Trickbot functions
November 6, 2019
Emotet, a Banking Trojan turned devastating modular threat, has returned with upgraded functions in a new wave of attacks. The malware, first discovered in 2014, has evolved over the past few years from a relatively basic, singular threat into a customizable modular package used to deploy additional payloads against financial institutions, the enterprise, and consumers worldwide. Emotet, believed to ...
- Kaspersky identifies mysterious APT mentioned in 2017 Shadow Brokers leak
November 5, 2019
In 2017, a mysterious group of hackers known as the Shadow Brokers published online a data dump called “Lost in Translation.” The data dump — believed to have been obtained from the US National Security Agency (NSA) — contained a collection of exploits and hacking tools, including the now-infamous EternalBlue, the exploit that provided the steam ...
- Buran Ransomware; the Evolution of VegaLocker
November 5, 2019
McAfee’s Advanced Threat Research Team observed how a new ransomware family named ‘Buran’ appeared in May 2019. Buran works as a RaaS model like other ransomware families such as REVil, GandCrab (now defunct), Phobos, etc. The author(s) take 25% of the income earned by affiliates, instead of the 30% – 40%, numbers from notorious malware families ...
- Wizard Spider Upgrades Ryuk Ransomware to Reach Deep into LANs
November 4, 2019
The Ryuk ransomware has added two features to enhance its effectiveness: The ability to target systems that are in “standby” or sleep mode; and the use of Address Resolution Protocol (ARP) pinging to find drives on a company’s LAN. Both are employed after the initial network compromise of a victim organization. Ryuk, which is distributed by ...