Cyber&Ramen: research with a side of byte-sized insights.
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Analysis of a DLL Downloader
Summary SHA256: dedb8516befa4a5088000b8c7f699dae7f33761403dd355a14684ac89ff56a9a Filename: Unknown Filetype: DLL File size: 39KB From here on, the above DLL will be referred to as “downloader.dll”. The file is capable of: Downloading files Interacting with a C2 server Malware Overview This is an older file that was first identified around October 2021. Downloader.dll is a downloader capable of downloading…
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Info-Stealing Tool Posing As Naver OTP
Summary SHA256: 3275f42c85c9e2fcb80d1f8c1c6227c2bcde9c0e719905ddbd2ca7373c6a8ec6 Filename: UpHelpers.exe Size: 3.41MB Extension: EXE Compilation Timestamp: 2022-01-05 23:41:20 Sandbox analysis: https://tria.ge/220118-emrgjsgfb7 UpHelpers.exe is an information-stealing/reconnaissance tool disguised as a Naver One Time Password, (OTP) generator app. Naver is a South Korean web portal that first debuted in 1999 and offers a number of services. The tool collects drive and directory…
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Analysis of njRAT PowerPoint Macros
I wanted to do a quick write-up on an interesting PowerPoint macro document that contains njRAT. njRAT is a .NET trojan first identified in 2013 that has largely targeted countries in the Middle East as well as South America. The malicious document can be found via MalwareBazaar: https://bazaar.abuse.ch/sample/edba3ca498110106418658167533034aeb929276fe81de80c6de1a6bb95120e0 Information Gathering When triaging a suspected malicious…
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A “GULP” of PlugX
Often attributed to Chinese-speaking threat actors, PlugX a remote access trojan(RAT), was identified by security researchers in 2012. With several variants of the RAT identified by vendors over the year, many techniques used to compromise systems have remained the same. While perusing public malware sandboxes for interesting new samples, I stumbled upon a Windows executable…
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More Flagpro, More Problems
No stranger to this blog, BlackTech has continued to modify techniques to compromise networks and even suffered an OPSEC slip in the way of an open directory. This post will cover a malicious document similar to that identified by [1] PWC and [2] NTT in the previous reporting on the group. While I cannot definitively…
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BlackTech Updates Elf-Plead Backdoor
Overview On November 10, 2020, JPCert[1] published a blog post in Japanese (the English version followed about a week later), providing an overview of BlackTech’s PLEAD backdoor, referred to as “ELF_PLEAD”, specifically targeting *nix systems. In late March 2021, Intezer[2] tweeted a hash of what was described as a fully undetectable (FUD) version of ELF_PLEAD.…
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