Types of Recent .NET Packers and Their Distribution Trends in Korea

0. Overview This post is a summary of the TI report, ‘Report on the Trends and Types of Recent .NET Packers.’ Please refer to the report in the hyperlink for more details on the topic. Recently, packers made with .NET are being found in various places both in and outside Korea. Thus, the ASEC analysis team aims to introduce the five most commonly distributed .NET packers and their distribution trends in Korea. We will overview the types of malware distributed…

ASEC Weekly Phishing Email Threat Trends (December 11th, 2022 – December 17th, 2022)

The ASEC analysis team monitors phishing email threats with the ASEC automatic sample analysis system (RAPIT) and honeypot. This post will cover the cases of distribution of phishing emails during the week from December 11th, 2022 to December 17th, 2022 and provide statistical information on each type. Generally, phishing is cited as an attack that leaks users’ login account credentials by disguising as or impersonating an institute, company, or individual through social engineering methods. On a broader note, the act…

ASEC Weekly Malware Statistics (December 12th, 2022 – December 18th, 2022)

The ASEC analysis team uses the ASEC automatic analysis system RAPIT to categorize and respond to known malware. This post will list weekly statistics collected from December 12th, 2022 (Monday) to December 18th, 2022 (Sunday). For the main category, downloader ranked top with 61.9%, followed by Infostealer with 24.7%, backdoor with 12.5%, and ransomware with 0.9%. Top 1 – SmokeLoader SmokeLoader is an Infostealer/downloader malware that is distributed via exploit kits. This week, it ranked first place with 28.9%. Like…

Caution! Malware Signed With Microsoft Certificate

Microsoft announced details on the distribution of malware signed with a Microsoft certificate.[1] According to the announcement, a driver authenticated with the Windows Hardware Developer Program had been abused due to the leakage of multiple Windows developer accounts. To prevent damage, Microsoft blocked the related accounts and applied a security update (Microsoft Defender 1.377.987.0 or later). To prevent security risks, Windows only allows the loading of kernel mode drivers that are signed. If a driver is not signed, it cannot…

ASEC Weekly Phishing Email Threat Trends (December 4th, 2022 – December 10th, 2022)

The ASEC analysis team monitors phishing email threats with the ASEC automatic sample analysis system (RAPIT) and Honeypot. This post will cover the cases of distribution of phishing emails during the week from December 4th, 2022 to December 10th, 2022 and provide statistical information on each type. Generally, phishing is cited as an attack that leaks users’ login account credentials by disguising as or impersonating an institute, company, or individual through social engineering methods. On a broader note, the act…