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Our team is tracking in-the-wild exploitation of zero-day vulnerabilities against PaperCut MF/NG which allow for unauthenticated remote code execution due to an authentication bypass.
UPDATE #1 – 4/25/23 @ 11am ET: Added information about additional exploitation seen against Papercut MF/NG Server where a crypto-miner was deployed.…
This post is also available in: 日本語 (Japanese)
Executive SummaryUnit 42 researchers are monitoring the trending topics, newly registered domains and squatting domains related to ChatGPT, as it is one of the fastest-growing consumer applications in history. The dark side of this popularity is that ChatGPT is also attracting the attention of scammers seeking to benefit from using wording and domain names that appear related to the site.…
AhnLab Security Emergency response Center (ASEC) has recently discovered the distribution of the BlackBit ransomware disguised as svchost.exe during the team’s monitoring. According to the ASEC’s internal infrastructure, the BlackBit ransomware has been continuously distributed since September last year.
The ransomware uses .NET Reactor to obfuscate its code, likely to deter analysis.…
Affected Platforms: WindowsImpacted Users: Windows usersImpact: Compromised machines are under the control of the threat actor, potentially resulting in stolen personally identifiable information (PII), credential theft, financial loss, etc.Severity Level: Medium
The time has come again for tax returns—and tax-based scams. Targeting calendar-based events enables threat actors to prepare ahead of time and have a new selection of targets on rotation.…
Executive summary
TEHTRIS Threat Hunters analyzed illicit cryptomining activity targeting Linux-based machines. The attack happened on one of our high interaction honeypots hosted in France in mid-January across a short timeframe (less than 5 minutes). Our honeypot was a Linux under Ubuntu 22.04. The cybercriminal group behind this attack employs a strategy to optimize the use of the compromised device’s resources.…
Check Point Research recently discovered three vulnerabilities in the “Microsoft Message Queuing” service, commonly known as MSMQ. These vulnerabilities were disclosed to Microsoft and patched in the April Patch Tuesday update. The most severe of these, dubbed QueueJumper by CPR (CVE-2023-21554), is a critical vulnerability that could allow unauthenticated attackers to remotely execute arbitrary code in the context of the Windows service process mqsvc.exe.…
This post is also available in: 日本語 (Japanese)
Executive SummaryUnit 42 recently discovered a malware campaign targeting Portuguese speakers, which aims to redirect cryptocurrency away from legitimate users’ wallets and into wallets controlled by threat actors instead. To do this, the campaign uses a type of malware known as a cryptocurrency clipper, which monitors the victim’s clipboard for signs that a cryptocurrency wallet address is being copied.…
By John Fokker, Ernesto Fernández Provecho and Max Kersten · April 05, 2023
We would like to thank Steen Pedersen and Mo Cashman for their remediation advice.
On the 4th and the 5th of April, a law enforcement taskforce spanning agencies across 17 countries – including the FBI, Europol and the Dutch Police – have disrupted the infamous browser cookie market known as Genesis Market and approached hundreds of its users.…
Research by: Jiri Vinopal, Dennis Yarizadeh and Gil Gekker
Key Findings:
Check Point Research (CPR) and Check Point Incident Response Team (CPIRT) encountered a previously unnamed ransomware strain, we dubbed Rorschach, deployed against a US-based company. Rorschach ransomware appears to be unique, sharing no overlaps that could easily attribute it to any known ransomware strain.…Published On : 2023-04-03
EXECUTIVE SUMMARYThe CYFIRMA research team has identified a new up-and-coming European threat actor group known as FusionCore. Running Malware-as-a-service, along with the hacker-for- hire operation, they have a wide variety of tools and services that are being offered on their website, making it a one-stop-shop for threat actors looking to purchase cost- effective yet customizable malware.…
By Securonix Threat Research: D.Iuzvyk, T.Peck, O.Kolesnikov
Sept. 25, 2023, updated Sept. 27, 2023, updated Oct. 6, 2023
tldr:Securonix Threat Research recently discovered an attack campaign appearing to originate from the threat group UAC-0154 targeting victims using a Pilot-in-Command (PIC) Drone manual document lure to deliver malware.…
By Securonix Threat Labs, Threat Research: D. Iuzvyk, T. Peck, O. Kolesnikov
March 30, 2023, updated April 5, 2023, updated April 18, 2023
While today is the last day for US income tax submissions, the TACTICAL#OCTOPUS campaign continues to target US victims. New samples have once again emerged related to this ongoing threat. …
AhnLab Security Emergency response Center (ASEC) has recently discovered the ChinaZ DDoS Bot malware being installed on inadequately managed Linux SSH servers. As one of the Chinese threat groups that were first discovered around 2014, the ChinaZ group installs various DDoS bots on Windows and Linux systems. [1] Major…
We recently discovered an novel undetected implant family targeting Linux servers, which we dubbed Mélofée.
We linked with high confidence this malware to chinese state sponsored APT groups, in particular the notorious Winnti group.
In this blogpost we will first analyze the capabilities offered by this malware family, which include a kernel mode rootkit, and then deep dive in an infrastructure pivot maze to discover related adversary toolsets.…
February 15, 2024 update – On January 20, 2024, the US government conducted a disruption operation against infrastructure used by a threat actor we track as Forest Blizzard (STRONTIUM), a Russian state-sponsored threat actor, as detailed here: https://www.justice.gov/opa/pr/justice-department-conducts-court-authorized-disruption-botnet-controlled-russian
December 4, 2023 update – Microsoft has identified a nation-state activity group tracked as Forest Blizzard (STRONTIUM), based in Russia, actively exploiting CVE-2023-23397 to provide secret, unauthorized access to email accounts within Exchange servers.…
Cyber espionage threat actors continue to target technologies that do not support endpoint detection and response (EDR) solutions such as firewalls, IoT devices, hypervisors and VPN technologies (e.g. Fortinet, SonicWall, Pulse Secure, and others). Mandiant has investigated dozens of intrusions at defense industrial base (DIB), government, technology, and telecommunications organizations over the years where suspected China-nexus groups have exploited zero-day vulnerabilities and deployed custom malware to steal user credentials and maintain long-term access to the victim environments.…
This post is also available in: 日本語 (Japanese)
Executive SummaryTrigona ransomware is a relatively new strain that security researchers first discovered in late October 2022. By analyzing Trigona ransomware binaries and ransom notes obtained from VirusTotal, as well as information from Unit 42 incident response, we determined that Trigona was very active during December 2022, with at least 15 potential victims being compromised.…
Late last year, Sophos X-Ops responded to exploitation of what appeared to be the ProxyNotShell attack flow, which targets Microsoft Exchange servers, and which Microsoft attempted to address in an early-November patch. That patch targeted two vulnerabilities, CVE-2022-41080 and CVE-2022-41082, which when attacked could result in remote code execution on vulnerable systems.…