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Continuing from the previous report, thi...

JPCERT/CC hosted JSAC2026 from January 21 to 23, 2026. JSAC is an annual conference dedicated to advancing the capabilities of security analysts by fostering the exchange of technical knowledge and operational insights related to incident analysis and response. Now in...

On December 3, 2025 (local time), a vulnerability allowing unauthenticated remote code execution in React Server Components (RSC) (CVE-2025-55182) was disclosed. JPCERT/CC has received multiple incident reports related to this attack. Among them, there was a case in which this...

In recent years, fileless malware and obfuscation techniques have made it increasingly difficult to detect suspicious activity by scanning files alone. To counter these threats, security researchers and malware analysts actively create and publish detection rules such as Sigma and...

In JPCERT/CC Eyes, we previously reporte...

This TSUBAME Report Overflow series discuss monitoring trends of overseas TSUBAME sensors and other activities which the Internet Threat Monitoring Quarterly Reports do not include. This article covers the monitoring results for the period April to June 2025. Fluctuations in...

From September to December 2024, JPCERT/CC has confirmed incidents involving CrossC2, the extension tool to create Cobalt Strike Beacon for Linux OS. The attacker employed CrossC2 as well as other tools such as PsExec, Plink, and Cobalt Strike in attempts...

JPCERT/CC Eyes previously introduced the...

This TSUBAME Report Overflow series discuss monitoring trends of overseas TSUBAME sensors and other activities which the Internet Threat Monitoring Quarterly Reports do not include. This article covers the monitoring results for the period January to March 2025. Trends of...

JPCERT/CC organised ICS Security Conference on 5 February 2025. This event aims to share the current threat to ICS both in Japan and overseas and the efforts of stakeholders in the field, as well as to help participants improve their...

In a previous article of JPCERT/CC Eyes, we reported on SPAWNCHIMERA malware, which infects the target after exploiting the vulnerability in Ivanti Connect Secure. However, this is not the only malware observed in recent attacks. This time, we focus on...

Following the previous blog post on the Main Track on Day 2, this article highlights the Workshops and Lightning Talks of JSAC2025.

Continuing from the previous blog article, this entry introduces the presentations on the 2nd day of JSAC2025. Observation of phishing criminal groups related to illegal money transfers and Mizuho Bank’s countermeasures -Fighting against phishing site malware ‘KeepSpy’- Speaker: Tsukasa Takeuchi,...

*Please note that this article is a tran...

This TSUBAME Report Overflow series discuss monitoring trends of overseas TSUBAME sensors and other activities which the Internet Threat Monitoring Quarterly Reports does not include. This article covers the monitoring results for the period of October to December 2024. Observation...

On January 21 and 22, 2025, JPCERT/CC held its annual technical conference JSAC, aiming at enhancing the skills and knowledge of security analysts. The conference brought experts in the field of cyber security together to share technical insights related to...

In January 2025, Ivanti published an adv...

There have recently been reports of unau...

Continuing from the previous article, Part 2 covers another case of a watering hole attack. This time, we will look at the case of a media-related website exploited in 2023. Flow of the attack Figure 1 shows the flow of...

Nowadays, many people probably recognize exploit of vulnerabilities in publicly exposed assets such as VPN and firewalls as the attack vector. In fact, many security incidents reported to JPCERT/CC also involve such devices. This is because vulnerabilities in VPN devices...