XLL Malware Distributed Through Email Posted By jcleebobgatenet , May 27, 2022 Malware strains have been created and distributed in various forms and types. As such, the ASEC analysis team is actively monitoring and analyzing such changes to allow AhnLab products to detect them. This post will introduce XLL malware that was discovered being distributed last year. XLL files are Microsoft Excel add-in files that operate with the extension .xll and can be opened by Excel. One thing to note is that the files are opened with MS Excel. This means users…
Method that Tricks Users to Perceive Attachment of PDF File as Safe File Posted By jcleebobgatenet , May 25, 2022 The ASEC analysis team has discovered the distribution of info-stealer malware using Attachment feature of PDF files. This attack method was discovered previously, but as the malware of this type has resurfaced and is being actively distributed, the team would like to share the information. Note that the attacker used a simple trick of using the attachment’s name to deceive users. Acrobat Reader has a feature of adding attachments to PDF files. Files with extensions such as .bin/.exe/.bat/.chm are blacklisted…
Infostealer Being Distributed via YouTube Posted By Sanseo , March 11, 2022 The ASEC analysis team has recently discovered an infostealer that is being distributed via YouTube. The attacker disguised the malware as a game hack for Valorant, and uploaded the following video with the download link for the malware, then guided the user to turn off the anti-malware program. The team has introduced another case of distribution disguised as a game hack or crack via YouTube in a previous ASEC blog post. When users click the link to download the game…
New Infostealer ‘ColdStealer’ Being Distributed Posted By jcleebobgatenet , February 25, 2022 The ASEC analysis team has discovered the distribution of ColdStealer that appears to be a new type of infostealer. The malware disguises itself as a software download for cracks and tools, a distribution method that was mentioned multiple times in previous ASEC blog posts. There are two cases for this type of malware distribution: 1. Distributing a single type of malware such as CryptBot or RedLine2. Dropper-type malware decompressing and executing various internal malware strains ColdStealer was distributed with the…
Vidar Exploiting Social Media Platform (Mastodon) Posted By jcleebobgatenet , January 26, 2022 The ASEC analysis team has recently discovered that Vidar is exploiting a social media platform named Mastodon to create C&C server addresses. Vidar is an info-stealer malware installed through spam emails and PUP, sometimes being disguised as a KMSAuto authenticator tool. It has been consistently distributed since the past, and there was a recent case of it being installed through other types of malware such as Stop ransomware. When Vidar is run, it first accesses the C&C server to receive…
