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Tag: FIREWALL
UPDATED: 1 June 2023 @ 1733 ET – Added shareable Huntress YARA rule for assistance in detection effortUPDATED: 1 June 2023 @ 2023 ET – Added Kostas community Sigma rule to assist in detection effortsUPDATED: 1 June 2023 @ 2029 ET – Added screenshots for the DLL that creates the human2.aspx…
Chinese Threat Actor Used Modified Cobalt Strike Variant to Attack Taiwanese Critical Infrastructure
Executive Summary
Read More EclecticIQ researchers identified a malicious web server very likely operated by a Chinese threat actor used to target Taiwanese government entities, including critical infrastructure.
The command-and-control infrastructure was publicly exposed to the internet. Based on log and meta data found on the server, EclecticIQ analysts assess with high confidence the threat actor performed offensive cyber operations, including reconnaissance, malware delivery, and post-exploitation against selected targets.…
Cisco Talos has observed a threat actor deploying a previously unidentified botnet program Talos is calling “Horabot,” which delivers a known banking trojan and spam tool onto victim machines in a campaign that has been ongoing since at least November 2020.
The threat actor appears to be targeting Spanish-speaking users in the Americas and, based on our analysis, may be located in Brazil.…
Read More Apache NiFi describes itself as “an easy-to-use, powerful, and reliable system to process and distribute data.” [1] In simple terms, NiFi implements a web-based interface to define how data is moved from a source to a destination. Users may define various “processors” to manipulate data along the way.…
On May 11 2023, Essential Addons for Elementor, a WordPress plugin with over one million active installations, released a patch for a critical vulnerability that made it possible for any unauthenticated user to reset arbitrary user passwords, including user accounts with administrative-level access. This vulnerability was discovered and responsibly disclosed by security researcher Rafie Muhammed.…
Summary
Read More Note: This joint Cybersecurity Advisory (CSA) is part of an ongoing #StopRansomware effort to publish advisories for network defenders that detail various ransomware variants and ransomware threat actors. These #StopRansomware advisories include recently and historically observed tactics, techniques, and procedures (TTPs) and indicators of compromise (IOCs) to help organizations protect against ransomware.…
By Securonix Threat Labs, Threat Research: D. Iuzvyk, T. Peck, O. Kolesnikov
TL;DRAn unusual attack/phishing campaign delivering malware while using meme-filled code and complex obfuscation methods continues dropping Xworm payloads for the last few months and is still ongoing today.
IntroFor the last few months, an interesting and ongoing attack campaign was identified and tracked by the Securonix Threat Research team.…
What is BPFdoor?
Read More BPFdoor is a Linux-specific, low-profile, passive backdoor intended to maintain a persistent, long-term foothold in already-breached networks and environments and functions primarily to ensure an attacker can re-enter an infected system over an extended period of time, post-compromise.
The malware gets its name from its usage of a Berkley Packet Filter – a fairly unique way of receiving its instructions and evading detection, which bypasses firewall restrictions on incoming traffic.…
This post is also available in: 日本語 (Japanese)
Executive SummaryRoyal ransomware has been involved in high-profile attacks against critical infrastructure, especially healthcare, since it was first observed in September 2022. Bucking the popular trend of hiring affiliates to promote their threat as a service, Royal ransomware operates as a private group made up of former members of Conti.…
The Increasing Menace of Small Ransomware Syndicates
Read More In recent years, ransomware operations have emerged as highly profitable cybercrime schemes. Numerous companies have suffered immense financial, data, and reputation losses due to such attacks. Typically, cybersecurity researchers tend to concentrate on prominent ransomware groups that run extensive Ransomware-as-a-Service (RaaS) operations.…
This post is also available in: 日本語 (Japanese)
Executive SummaryConfiguration data that changes across each instance of deployed malware can be a gold mine of information about what the bad guys are up to. The problem is that configuration data in malware is usually difficult to parse statically from the file, by design.…
This post is also available in: 日本語 (Japanese)
Executive SummaryFrom July-December 2022, Unit 42 researchers have observed and analyzed over 67 million unique malicious URLs, domains and IPs, which we use to block associated malicious network traffic. We will cover the trends we have observed during the second half of 2022 based on our detections of malicious URLs, domains and IPs.…
In March and April 2023, we observed a type of ransomware targeting its victims via a minimalistic approach with tools that leave only a minimal footprint behind. Our findings revealed many of the preparations made by the perpetrators and how quickly they managed to carry out the ransomware attack.…
Securing The Educational Sector Against PaperCut Vulnerability and Ransomware
Read More On 19th April 2023, PaperCut released a Security alert stating, “We have evidence to suggest that unpatched servers are being exploited in the wild”. The advisory released by vendors provides insights into the two CVEs – CVE-2023-27350 (Severity: Critical) & CVE-2023-27351(Severity: High).…
This post is also available in: 日本語 (Japanese)
Executive SummaryUnit 42 researchers recently identified a new variant of PingPull malware used by Alloy Taurus actors designed to target Linux systems. While following the infrastructure leveraged by the actor for this PingPull variant, we also identified their use of another backdoor we track as Sword2033.…
By Securonix Threat Labs, Threat Research: Den Iuzvyk, Tim Peck, Oleg Kolesnikov
TL;DRThe Securonix Threat Research team (STR) has recently observed a new attack campaign tracked by Securonix as OCX#HARVESTER. Some of the malicious payloads leveraged as part of the attack campaign observed appear to be related to the More_eggs malicious payloads reported earlier [1].…
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.…