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The threat actors behind BlackCat ransomware have come up with an improved variant that prioritizes speed and stealth in an attempt to bypass security guardrails and achieve their goals. The new version, dubbed  Sphynx  and announced in February 2023, packs a "number of updated capabilities that strengthen the group's efforts to evade detection," IBM Security X-Force said in a new analysis. The "product" update was  first highlighted  by vx-underground in April 2023. Trend Micro, last month,  detailed  a Linux version of Sphynx that's "focused primarily on its encryption routine." BlackCat , also called ALPHV and Noberus, is the first Rust-language-based ransomware strain spotted in the wild. Active since November 2021, it has emerged as a formidable ransomware actor, victimizing  more than 350 targets  as of May 2023. The group, like other ransomware-as-a-service (RaaS) offerings, is  known  to operate a double extortion scheme, deploying c

Linux routers in Japan are the target of a new Golang remote access trojan (RAT) called  GobRAT . "Initially, the attacker targets a router whose WEBUI is open to the public, executes scripts possibly by using vulnerabilities, and finally infects the GobRAT," the JPCERT Coordination Center (JPCERT/CC)  said  in a report published today. The compromise of an internet-exposed router is followed by the deployment of a loader script that acts as a conduit for delivering GobRAT, which, when launched, masquerades as the Apache daemon process (apached) to evade detection. The loader is also equipped to disable firewalls, establish persistence using the cron job scheduler, and register an SSH public key in the  .ssh/authorized_keys file  for remote access. GobRAT, for its part, communicates with a remote server via the Transport Layer Security ( TLS ) protocol to receive as many as 22 different encrypted commands for execution. Some of the major commands are as follows - Obt

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A new ransomware-as-service (RaaS) operation called MichaelKors has become the latest file-encrypting malware to target Linux and  VMware ESXi systems  as of April 2023. The development points to cybercriminal actors increasingly setting their eyes on the ESXi, cybersecurity firm CrowdStrike said in a report shared with The Hacker News. "This trend is especially noteworthy given the fact that ESXi, by design, does not support third-party agents or AV software," the company said. "In fact, VMware goes as far as to claim it's not required. This, combined with the popularity of ESXi as a widespread and popular virtualization and management system, makes the hypervisor a highly attractive target for modern adversaries." The  targeting of VMware ESXi hypervisors  with ransomware to scale such campaigns is a technique known as  hypervisor jackpotting . Over the years, the approach has been adopted by several ransomware groups, including Royal. What's more

A previously undocumented and mostly undetected variant of a Linux backdoor called  BPFDoor  has been spotted in the wild, cybersecurity firm Deep Instinct said in a technical report published this week. " BPFDoor  retains its reputation as an extremely stealthy and difficult-to-detect malware with this latest iteration," security researchers Shaul Vilkomir-Preisman and Eliran Nissan said . BPFDoor (aka JustForFun), first documented by  PwC  and  Elastic Security Labs  in May 2022, is a passive Linux backdoor associated with a Chinese threat actor called  Red Menshen (aka  DecisiveArchitect  or Red Dev 18), which is known to single out telecom providers across the Middle East and Asia since at least 2021. The malware is specifically geared towards  establishing persistent remote access  to compromised target environments for extended periods of time, with evidence pointing to the hacking crew operating the backdoor undetected for years. BPFDoor gets its name from the u

The threat actors behind  RTM Locker  have developed a ransomware strain that's capable of targeting Linux machines, marking the group's first foray into the open source operating system. "Its locker ransomware infects Linux, NAS, and ESXi hosts and appears to be inspired by  Babuk  ransomware's leaked source code," Uptycs said in a new report published Wednesday. "It uses a combination of  ECDH  on Curve25519 (asymmetric encryption) and  Chacha20  (symmetric encryption) to encrypt files." RTM Locker was  first documented  by Trellix earlier this month, describing its developers as a private ransomware-as-a-service (RaaS) provider. It has its roots in a cybercrime group called Read The Manual (RTM) that's known to be active since at least 2015. The group is notable for deliberately avoiding high-profile targets such as critical infrastructure, law enforcement, and hospitals so as to draw as little attention as possible. It also leverages affili

The Chinese nation-state group dubbed  Alloy Taurus  is using a Linux variant of a backdoor called PingPull as well as a new undocumented tool codenamed Sword2033. That's according to findings from Palo Alto Networks Unit 42, which  discovered  recent malicious cyber activity carried out by the group targeting South Africa and Nepal. Alloy Taurus is the constellation-themed moniker assigned to a threat actor that's known for its attacks targeting telecom companies since at least 2012. It's also tracked by Microsoft as Granite Typhoon (previously Gallium). Last month, the adversary was attributed to a campaign called  Tainted Love  targeting telecommunication providers in the Middle East as part of a broader operation referred to as Soft Cell. Recent cyber espionage attacks mounted by Alloy Taurus have also broadened their victimology footprint to include financial institutions and government entities. PingPull,  first documented  by Unit 42 in June 2022, is a remote

The notorious North Korea-aligned state-sponsored actor known as the  Lazarus Group  has been attributed to a new campaign aimed at Linux users. The attacks are part of a persistent and long-running activity tracked under the name  Operation Dream Job , ESET said in a  new report  published today. The findings are crucial, not least because it marks the first publicly documented example of the adversary using Linux malware as part of this social engineering scheme. Operation Dream Job , also known as  DeathNote or NukeSped , refers to multiple attack waves wherein the group leverages fraudulent job offers as a lure to trick unsuspecting targets into downloading malware. It also  exhibits overlaps  with two other Lazarus clusters known as Operation In(ter)ception and Operation North Star. The attack chain discovered by ESET is no different in that it delivers a fake HSBC job offer as a decoy within a ZIP archive file that's then used to launch a Linux backdoor named SimplexTea

The Pakistan-based advanced persistent threat (APT) actor known as  Transparent Tribe  used a two-factor authentication (2FA) tool used by Indian government agencies as a ruse to deliver a new Linux backdoor called Poseidon. "Poseidon is a second-stage payload malware associated with Transparent Tribe," Uptycs security researcher Tejaswini Sandapolla said in a technical report published this week. "It is a general-purpose backdoor that provides attackers with a wide range of capabilities to hijack an infected host. Its functionalities include logging keystrokes, taking screen captures, uploading and downloading files, and remotely administering the system in various ways." Transparent Tribe  is also tracked as APT36, Operation C-Major, PROJECTM, and Mythic Leopard, and has a track record of targeting Indian government organizations, military personnel, defense contractors, and educational entities. It has also repeatedly leveraged trojanized versions of Kavac

A Chinese state-sponsored threat activity group tracked as  RedGolf  has been  attributed  to the use of a custom Windows and Linux backdoor called KEYPLUG. "RedGolf is a particularly prolific Chinese state-sponsored threat actor group that has likely been active for many years against a wide range of industries globally," Recorded Future told The Hacker News. "The group has shown the ability to rapidly weaponize  newly reported vulnerabilities (e.g. Log4Shell and  ProxyLogon ) and has a history of developing and using a large range of custom malware families." The use of KEYPLUG by Chinese threat actors was  first disclosed  by Google-owned Manidant in March 2022 in attacks targeting multiple U.S. state government networks between May 2021 and February 2022. Then in October 2022, Malwarebytes  detailed  a separate set of attacks targeting government entities in Sri Lanka in early August that leveraged a novel implant dubbed DBoxAgent to deploy KEYPLUG. Bot

An unknown Chinese state-sponsored hacking group has been linked to a novel piece of malware aimed at Linux servers. French cybersecurity firm ExaTrack, which found three samples of the previously documented malicious software that date back to early 2022, dubbed it  Mélofée . The newest of the three artifacts is designed to drop a kernel-mode rootkit that's based on an open source project referred to as  Reptile . "According to the vermagic metadata, it is compiled for a kernel version 5.10.112-108.499.amzn2.x86_64," the company  said  in a report. "The rootkit has a limited set of features, mainly installing a hook designed for hiding itself." Both the implant and the rootkit are said to be deployed using shell commands that download an installer and a custom binary package from a remote server. The installer takes the binary package as an argument and then extracts the rootkit as well as a server implant module that's currently under active develop

Poorly managed Linux SSH servers are being targeted as part of a new campaign that deploys different variants of a malware called ShellBot. "ShellBot, also known as  PerlBot , is a DDoS Bot malware developed in Perl and characteristically uses IRC protocol to communicate with the C&C server," AhnLab Security Emergency response Center (ASEC)  said  in a report. ShellBot is installed on servers that have weak credentials, but only after threat actors make use of scanner malware to identify systems that have SSH port 22 open. A list of known SSH credentials is used to initiate a dictionary attack to breach the server and deploy the payload, after which it leverages the Internet Relay Chat ( IRC ) protocol to communicate with a remote server. This encompasses the ability to receive commands that allows ShellBot to carry out DDoS attacks and exfiltrate harvested information. ASEC said it identified three different ShellBot versions – LiGhT's Modded perlbot v2, DDoS

A previously known Windows-based ransomware strain known as IceFire has expanded its focus to target Linux enterprise networks belonging to several media and entertainment sector organizations across the world. The intrusions entail the exploitation of a recently disclosed deserialization vulnerability in IBM Aspera Faspex file-sharing software ( CVE-2022-47986 , CVSS score: 9.8), according to cybersecurity company SentinelOne. "This strategic shift is a significant move that aligns them with  other   ransomware  groups that also target Linux systems," Alex Delamotte, senior threat researcher at SentinelOne,  said  in a report shared with The Hacker News. A majority of the attacks observed by SentinelOne have been directed against companies located in Turkey, Iran, Pakistan, and the U.A.E., countries that are not typically targeted by organized ransomware crews. IceFire  was first detected in March 2022 by the  MalwareHunterTeam , but it wasn't until August 2022 tha

The threat actor known as  Lucky Mouse  has developed a Linux version of a malware toolkit called SysUpdate, expanding on its ability to target devices running the operating system. The oldest version of the updated artifact dates back to July 2022, with the malware incorporating new features designed to evade security software and resist reverse engineering. Cybersecurity company Trend Micro  said  it observed the equivalent Windows variant in June 2022, nearly one month after the command-and-control (C2) infrastructure was set up. Lucky Mouse is also  tracked  under the monikers APT27, Bronze Union, Emissary Panda, and Iron Tiger, and is known to utilize a variety of malware such as  SysUpdate , HyperBro, PlugX, and a Linux backdoor dubbed rshell. Over the past two years, campaigns orchestrated by the threat group have embraced supply chain compromises of legitimate apps like  Able Desktop  and  MiMi Chat  to obtain remote access to compromised systems. In October 2022, Intrin

A new variant of the notorious Mirai botnet has been found leveraging several security vulnerabilities to propagate itself to Linux and IoT devices. Observed during the second half of 2022, the new version has been dubbed  V3G4  by Palo Alto Networks Unit 42, which identified three different campaigns likely conducted by the same threat actor. "Once the vulnerable devices are compromised, they will be fully controlled by attackers and become a part of the botnet," Unit 42 researchers  said . "The threat actor has the capability to utilize those devices to conduct further attacks, such as distributed denial-of-service (DDoS) attacks." The attacks primarily single out exposed servers and networking devices running Linux, with the adversary weaponizing as many as 13 flaws that could lead to remote code execution (RCE). Some of the notable flaws relate to critical flaws in Atlassian Confluence Server and Data Center, DrayTek Vigor routers, Airspan AirSpot, and Geu

Cisco has rolled out security updates to address a critical flaw reported in the ClamAV open source antivirus engine that could lead to remote code execution on susceptible devices. Tracked as  CVE-2023-20032  (CVSS score: 9.8), the issue relates to a case of remote code execution residing in the HFS+ file parser component. The flaw affects versions 1.0.0 and earlier, 0.105.1 and earlier, and 0.103.7 and earlier. Google security engineer Simon Scannell has been credited with discovering and reporting the bug. "This vulnerability is due to a missing buffer size check that may result in a heap buffer overflow write," Cisco Talos  said  in an advisory. "An attacker could exploit this vulnerability by submitting a crafted HFS+ partition file to be scanned by ClamAV on an affected device." Successful exploitation of the weakness could enable an adversary to run arbitrary code with the same privileges as that of the ClamAV scanning process, or crash the process, resu

The first-ever Linux variant of the Clop ransomware has been detected in the wild, but with a faulty encryption algorithm that has made it possible to reverse engineer the process. "The ELF executable contains a flawed encryption algorithm making it possible to decrypt locked files without paying the ransom," SentinelOne researcher Antonis Terefos  said  in a report shared with The Hacker News. The cybersecurity firm, which has made available a decryptor , said it observed the ELF version on December 26, 2022, while also noting its similarities to the Windows flavor when it comes using the same encryption method. The detected sample is said to be part of a larger attack targeting educational institutions in Colombia, including La Salle University, around the same time. The university was added to the criminal group's leak site in early January 2023, per  FalconFeedsio . Known to have been active since 2019, the Clop (stylized as Cl0p) ransomware operation  suffered

Malicious actors are actively attempting to exploit a recently patched critical vulnerability in Control Web Panel (CWP) that enables elevated privileges and unauthenticated remote code execution (RCE) on susceptible servers. Tracked as  CVE-2022-44877  (CVSS score: 9.8), the bug impacts all versions of the software before 0.9.8.1147 and was  patched  by its maintainers on October 25, 2022. Control Web Panel, formerly known as CentOS Web Panel, is a popular server administration tool for enterprise-based Linux systems. "login/index.php in CWP (aka Control Web Panel or CentOS Web Panel) 7 before 0.9.8.1147 allows remote attackers to execute arbitrary OS commands via shell metacharacters in the login parameter," according to  NIST . Gais Security researcher Numan Turle has been credited with discovering and reporting the flaw to the Control Web Panel developers. Exploitation of the flaw is said to have commenced on January 6, 2023, following the  availability  of a proof

A new Linux malware developed using the shell script compiler ( shc ) has been observed deploying a cryptocurrency miner on compromised systems. "It is presumed that after successful authentication through a dictionary attack on inadequately managed Linux SSH servers, various malware were installed on the target system," AhnLab Security Emergency Response Center (ASEC)  said  in a report published today. shc allows shell scripts to be converted directly into binaries, offering protections against unauthorized source code modifications. It's analogous to the  BAT2EXE utility  in Windows that's used to convert any batch file to an executable. By using shc to generate ELF files, the idea is to protect the malicious shell commands from being inspected and potentially bypass detection by security software as the executables are encoded using the RC4 algorithm . In an attack chain detailed by the South Korean cybersecurity firm, a successful compromise of the SSH serv

WordPress sites are being targeted by a previously unknown strain of Linux malware that exploits flaws in over two dozen plugins and themes to compromise vulnerable systems. "If sites use outdated versions of such add-ons, lacking crucial fixes, the targeted web pages are injected with malicious JavaScripts," Russian security vendor Doctor Web  said  in a report published last week. "As a result, when users click on any area of an attacked page, they are redirected to other sites." The attacks involve weaponizing a list of known security vulnerabilities in 19 different plugins and themes that are likely installed on a WordPress site, using it to deploy an implant that can target a specific website to further expand the network. It's also capable of injecting JavaScript code retrieved from a remote server in order to redirect the site visitors to an arbitrary website of the attacker's choice. Doctor Web said it identified a second version of the backdoor

Reality has a way of asserting itself, irrespective of any personal or commercial choices we make, good or bad. For example, just recently, the city services of Antwerp in Belgium were the victim of a highly disruptive cyberattack.  As usual, everyone cried "foul play" and suggested that proper cybersecurity measures should have been in place. And again, as usual, it all happens a bit too late. There was nothing special or unique about the attack, and it wasn't the last of its kind either. So why are we, in IT, still happily whistling into the wind and moving along as if nothing happened? Is everyone's disaster recovery plan really that good? Are all the security measures in place – and tested? Let's Do a Quick Recap (of What You Should Be Doing) First, cover the basics. Perform proper user training that includes all of the usual: password hygiene, restrictions on account sharing, and clear instructions not to open untrusted emails or to access unscrupulous w