List of “朝長 秀誠 (Shusei Tomonaga)” - JPCERT/CC Eyes (original) (raw)
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 YARA. However, many existing endpoint security tools rely on unique detection engines, instead of directly using Sigma or YARA. To address this problem, JPCERT/CC released the open-source threat hunting tool... Read more
There have recently been reports of unauthorized access in Japan, usin... Read more
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 the watering hole attack. When someone accesses the tampered website, an LZH file is downloaded, and when they execute the LNK file in the LZH file, their PC becomes infected... Read more
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 are exploited not only by APT groups but also by many other groups such as ransomware actors and cyber crime actors, and the number of incidents is high accordingly. As... Read more
Many people may think of EventLogs when one mentions Windows OS logs. When investigating incidents such as malware infections, it is common to analyze the Windows OS EventLogs to find traces that may help uncover the incident. However, since the EventLog is not designed to detect suspicious behavior on Windows OS, you may not always find the information you are looking for when investigating an incident. Therefore, it is necessary... Read more
JPCERT/CC has been observing attack activities by MirrorFace LODEINFO ... Read more
JPCERT/CC has confirmed that Lazarus has released malicious Python packages to PyPI, the official Python package repository (Figure 1). The Python packages confirmed this time are as follows: pycryptoenv pycryptoconf quasarlib swapmempool The package names pycryptoenv and pycryptoconf are similar to pycrypto, which is a Python package used for encryption algorithms in Python. Therefore, the attacker probably prepared the malware-containing malicious packages to target users' typos in installing Python packages.... Read more
As attacks become more fileless and malware gets more obfuscated, it is getting more difficult to determine whether there is a malicious intent from a file by itself. For this reason, malware detection methods that utilize sandboxes and AI, as well as technologies that detect suspicious behavior after malware infection, such as EDR, have now become common. Even so, malware that antivirus software cannot detect is often found during actual... Read more
JPCERT/CC has observed attacks on cryptocurrency exchanges believed to be related to DangerousPassword attack campaign (also known as CryptoMimic or SnatchCrypto) continuously since June 2019. For many years, attackers have been using an attack technique of infecting targets with malware by sending shortcut files to them via email. However, it is known that they also use various other patterns of attacks to infect the targets with malware. This article will... Read more
I believe that automating analysis is a challenge that all malware analysts are working on for more efficient daily incident investigations. Cloud-based technologies (CI/CD, serverless, IaC, etc.) are great solutions that can automate MAOps efficiently. In this article, I introduce how JPCERT/CC automates malware analysis on the cloud, based on the following case studies. Malware C2 Monitoring Malware Hunting using Cloud YARA CI/CD system Surface Analysis System on Cloud Memory... Read more