New Ransomware Targets VMware ESXi servers

Cyble Research and Intelligence Labs (CRIL) observed an increase in the number of ransomware groups launching Linux variants, such as Cylance and Royal ransomware. This can be attributed to the fact that Linux is extensively utilized as an operating system across various sectors, including enterprise environments and cloud computing platforms.…

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We observed the threat actor group known as “8220 Gang” employing new strategies for their respective campaigns, including exploits for the Linux utility “lwp-download” and CVE-2017-3506, an Oracle WebLogic vulnerability.

Update as of 7/25/2023 3:40PM PHT: Updated the indicators of compromise.

8220 Gang (also known as “8220 Mining Group,” derived from their use of port 8220 for command and control or C&C communications exchange) has been active since 2017 and continues to scan for vulnerable applications in cloud and container environments.…

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By Securonix Threat Labs, Threat Research: D. Iuzvyk, T. Peck, O. Kolesnikov

TL;DR

An 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.

Intro

For the last few months, an interesting and ongoing attack campaign was identified and tracked by the Securonix Threat Research team.…

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SUMMARY

The Federal Bureau of Investigation (FBI) and Cybersecurity and Infrastructure Security Agency (CISA) are releasing this joint Cybersecurity Advisory (CSA) in response to the active exploitation of CVE-2023-27350. This vulnerability occurs in certain versions of PaperCut NG and PaperCut MF and enables an unauthenticated actor to execute malicious code remotely without credentials.…

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This post is also available in: 日本語 (Japanese)

Executive Summary

Royal 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.…

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Affected platforms: LinuxImpacted parties: Any organizationImpact: Remote attackers gain control of vulnerable systemsSeverity level: Critical

In April, FortiGuard Labs observed a unique botnet based on the SOCKS protocol distributed through the Ruckus vulnerability (CVE-2023-25717). This botnet, known as AndoryuBot, first appeared in February 2023. It contains DDoS attack modules for different protocols and communicates with its command-and-control server using SOCKS5 proxies.…

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After months of dormancy, Earth Longzhi, a subgroup of advanced persistent threat (APT) group APT41, has reemerged using new techniques in its infection routine. This blog entry forewarns readers of Earth Longzhi’s resilience as a noteworthy threat.

We discovered a new campaign by Earth Longzhi (a subgroup of APT41) that targets organizations based in Taiwan, Thailand, the Philippines, and Fiji.…

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Ransomware has been one of the most glaring threats against organizations in recent years. Since 2021 SOCRadar has detected around 5,600 ransomware attacks. There was a rise from 2021 to 2022 in the number of attacks detected. This trend seems to continue in 2023 because even though it is not half of the year, there is already half the number of attacks detected compared to 2021.…

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AhnLab Security Emergency response Center (ASEC) has recently discovered XMRig CoinMiner being installed on poorly managed Linux SSH servers. The attacks have been happening with a distinct pattern since 2022: they involve the usage of malware developed with Shell Script Compiler (SHC) when installing the XMRig, as well as the creation of a backdoor SSH account.…

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Securing The Educational Sector Against PaperCut Vulnerability and Ransomware

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).…

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Last week, the Zero Day Initiative (ZDI) threat-hunting team observed new exploit attempts coming from our telemetry system in Eastern Europe indicating that the Mirai botnet has updated its arsenal to include CVE-2023-1389, also known as ZDI-CAN-19557/ZDI-23-451. This bug in the TP-Link Archer AX21 Wi-Fi router was originally disclosed to ZDI during the Pwn2Own Toronto event, where it was used by Team Viettel in their LAN-side entry against the TP-Link device and by Qrious Security in their WAN-side entry. …

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Over the past several months, Sophos X-Ops has investigated multiple incidents where attackers attempted to disable EDR clients with a new defense evasion tool we’ve dubbed AuKill. The AuKill tool abuses an outdated version of the driver used by version 16.32 of the Microsoft utility, Process Explorer, to disable EDR processes before deploying either a backdoor or ransomware on the target system.…

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Summary

Since the beginning of January 2023, the BlackBerry Threat Research and Intelligence team has been following two parallel malicious campaigns that use the same infrastructure but have different purposes.

The first campaign is related to a malvertising Google Ads Platform campaign which began several months ago and distributed fake versions of legitimate software products like AnyDesk (remote desktop software), Libre Office (an open-source office productivity software suite), TeamViewer (remote access and remote-control software), and Brave (a free and open-source web browser) among others.…

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Over the past several months, Microsoft has observed a mature subgroup of Mint Sandstorm, an Iranian nation-state actor previously tracked as PHOSPHORUS, refining its tactics, techniques, and procedures (TTPs). Specifically, this subset has rapidly weaponized N-day vulnerabilities in common enterprise applications and conducted highly-targeted phishing campaigns to quickly and successfully access environments of interest.…

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