java… Leveraging Java Bytecode for Fun & Analysis 14 Jan 202215 Jan 2022 Summary An approach similar to modifying assembly code to direct control flow can be used to de-obfuscate and reverse-engineer Java malware or any compiled Java classes for that matter. In…
reverse engineering… Potential Anti-analysis with XLM NOW() Function- IcedID Delivery 2 Apr 20213 Apr 2021 TL;DR - XLM sample for IcedID delivery is using the NOW() macro function and non-volatility to possibly make the analysis difficult. While looking for the latest trends on MalwareBazaar yesterday,…
Trojan AsyncRAT delivery technique: 10 minute analysis 1 Mar 20212 Mar 2021 Lately, I have been looking at MalwareBazaar for some samples in order to do analysis. I noticed that the samples are conveniently tagged and can be used to see some…
exploit-dev… Backdooring NSIS based installer: A Cautionary Tale 1 Jan 20203 Jan 2020 Understandably, this post does not follow the theme of malware analysis of this blog. However, it would be fair to add some range to the topics here. This post came…
macros… TA505 campaign: Macro Analysis 10 Nov 201912 Nov 2019 Starting September we have seen a rise in campaigns from TA505 threat actor. They send emails in bulk with spoofed messages regarding hosted files on (spoofed) cloud share services. The…
emotet… API address resolution (Emotet) 2 Oct 201923 Dec 2019 Since the Emotet campaign has been back again for the past 2 weeks I got my hands on one of the samples (3e269b0ba5c550cd0636355f2b8da977dac2dc4ad42bcf8b917322006ccf4745) that someone tweeted and started to dissect.…
ransomware… Reversing: Locky Osiris (Part II) 12 Mar 201714 Mar 2017 For this post I would be using IDA Pro and OllyDbg. While jumping back and forth between these tools I will follow the naming convention of IDA Pro more often than OllyDbg.…
ransomware… Reversing: Locky Osiris (Part I) 8 Feb 201710 Feb 2017 I was hoping for this to be my last post about Osiris, but since the DLL (shtefans1.spe) is packed it would not be possible for me to cover reverse engineering in one…
macros… Macros: Locky Osiris 28 Jan 20179 Feb 2017 In this post we will go through the macro code for the excel file that was used to bait users into downloading and dropping the malware payload. The macros (ThisWB, Module1) that we…
ransomware… Static Analysis: Locky Osiris 22 Jan 20179 Feb 2017 This post is a continuation of the previous blog post about recent Locky variant. Now let's use OfficeMalScanner to confirm the existence of bin files. As we can see, there is…
Evil Code Analysis 