Questions tagged [malware]

Malware, a portmanteau for malicious software, is software used or created by attackers to disrupt computer operation, gather sensitive information, or gain access to computer systems.

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decoding thread context structure in x64dbg

Is there any way to decode the thread context structure returned by "GetThreadContext" and used by "SetThreadContext" in x64dbg?
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50 views

What is the meaning of SYSTEM_INFO.wProcessorLevel?

I am performing some RE on a malware sample, and they are checking the value of SYSTEM_INFO[32] which is SYSTEM_INFO.wProcessorLevel. The description MS provides is not clear to me. The malware checks ...
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130 views

Analyzing a possibly malware sample

I am trying to analyze a possible malicious sample. It's a windows executable e3f04124e2e26f8f030f6845086875a9 Md5sum Intel 386 or later processors and compatible processors File 2464.exe 2464.exe: ...
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53 views

Decode byte numbers into string

There is this grabber called Itroublve grabber, which a lot of people use, and I wondered what it's aes encryption key is, so I looked at the code, and I found this: Key = new byte[] { ...
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Is it possible to fake being joined to a domain in Windows 10?

I'm dealing with a malware sample from a pentest that will only execute properly if the system is a member of the target organization's Windows Active Directory domain. Rather than standing up my own ...
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65 views

Problem with analyzing malware

We have a malware that blocks all analytics software in real time. This software has blacklisted a large list of software that performs analysis (x64dbg, ida, serialport monitor, etc.) This software ...
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How to extract an AutoIT script when tools fail to extract it?

Lets say you have a Autoit malware (windows executable, autoit v3), and you want to extract the script from it. But tools such as exe2aut fail to extract it. What would you do? is there any place in ...
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1answer
1k views

What conditions can create the "Not a Valid Win32 Application" error message upon load?

I'm doing research on the PE format/Windows Loader and I am unable to locate specifics as to what creates the error "Not a valid Win32 Application" followed by a failure to load. I've tried changing ...
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viewing debugging symbols in windbg

I am currently learning Malware Analysis using the book "Practical Malware Analysis", and I am going along with the chapter on Kernel debugging. When viewing the same code snippet on WinDbg ...
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2answers
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Format of data in the .code/.text section

I'm attempting to dissect/disassemble a windows PE file under Linux using objdump. On surface analysis, the .code section was disassembled to : tmp.exe: file format pei-i386 Disassembly of ...
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401 views

CaptureBAT equivalent on Windows 10?

Hello RE community on stack ! I am a beginner, so please pardon any commonplace errors I am looking to run CaptureBAT on a Windows 10 VM, to capture network activity of different kinds of Malwares I ...
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1answer
411 views

How can I de-obfuscate a VBScript (.vbs) file?

I have a VBScript (.vbs) file that is a malware dropper. It executes correctly in a commercial malware sandbox. but does not act the same in my manual analysis lab, and I need to figure out why. The ...
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471 views

Academic journals for latest RE/Malware/Exploitation research?

I am looking for journals to keep track of the latest advances in reverse engineering, binary analysis, malware, binary exploitation, etc.
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451 views

Whether samples downloaded from virus share can execute automatically in my computer

I am doing some android malware analysis work and downloaded many android samples in virus share, but I found some of them are windows malware e.g. labeled 'win32' or something. Are these windows ...
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33 views

Capturing created and deleted files from a Java file

I am new to the malware analysis field but I do have an issue, a file I am working on creates 2 vbs files, reads from them and deletes them, this all happens in around 2 seconds. Also this is a Java ...
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4answers
4k views

Debugging malware that will only run as a service

I'm trying to debug a malware sample that installs to a system as service and then will only start if it starts as a service. Other functions are still available without the service start, like ...
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1answer
77 views

Want to use win API hooking to detect wmi query string? But can't find IWbemServices::ExecQuery in fastprox.dll

I want to implement WMI query detection function using apimon plugin in sandbox https://github.com/tklengyel/drakvuf To do it,I have to get the DLL symbol file. But I can't locate the IWbemServices::...
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1answer
164 views

Disassemble and debug dynamic generated code executed via delegate in c#

I'm trying to reverse engeneer a malware using dnSpy that at some point do this: delegate IntPtr H7IREAEBYY(string path, IntPtr data); byte[] array = new byte[] { 233, 151, ... } IntPtr value ...
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1answer
1k views

Unable to unpack heavly obfuscated malware

I'm trying to unpack malware packed with ConfuserEx 1.0.0 and I can't seem to get it to work. Each time I remove the anti-tamper the whole file gets corrupted. I tried all possible tools that I found ...
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1answer
72 views

Understanding the basics of Reverse Engineering a segment of code

Currently trying to understand the following code and what it is doing. mov eax, 1 test eax, eax jz loc_411503 mov esi, esp call ds:_kbhit cmp esi, esp call sub_411159 test ...
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5k views

Reversing Pyarmor Discussion

Anyone messing around with pyarmor recently? For those of you that are unaware of what pyarmor is, its a protection software that is to help obfuscate and protect your software. Heres an image of what ...
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45 views

Anti-Reversing: Unable to patch memory/set breakpoints of process with x64, unusual memory segment

I'm working on a sample that contains packing and anti-analysis measures. Using ScyllaHide plugin for x64dbg currently with all checks enabled (not sure if this would affect anything, I've tried ...
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77 views

How to mark data as pointer to external functions in ghidra

I'm examining a piece of malware with Ghidra, and like most malware it uses LoadLibrary and GetProcAddress to dynamically load libraries and functions. GetProcAddress stores the function addresses in ...
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new to malware analysis and disassembly. dotpeek has been helpful. is this unreadable code due to SuppressIldasmAttribute?

just getting into rev engineering malware. i want to get to source on my own. i could use run.any or VT but that's no fun. any reason why this is unreadable the way it is? is it due to the module ...
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1answer
1k views

I'm would like to view this malicious payload, but am having trouble decoding it

This is a gzip compressed base64 string. I tried decoding it with an online converter but it said the data was corrupt. Can anyone decode this? H4sIAAAAAAAAAL1X6W6jyBb+...
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23 views

Domain Generating Algorithm

Has anyone modified a DGA and Seed? Is it difficult? I'd like to use an existing DGA and seed, alter both in my lab, deploy malware in my lab, and test so I fully understand the inner workings of how ...
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37 views

Is there any way to STOP the loop of the IDApython?

Is there any way to STOP the loop of the IDApython ? I want to stop the loop processing of IDAPython with any timing after starting the IDAPython(which contain loop function) from IDApro menu -> ...
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203 views

Windbg vs x64dbg for network analysis

I have a program that I want to perform malware analysis on. The program seems to use HTTPs with SSL pinning (my theory) and some other proprietary protocol. I want to understand what is the best tool ...
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32 views

Malware sample in hybrid-analysis.com

I've been watching great SANS Instructor John Hubbard's video in YouTube and would like to try analyze similar malware sample. The second macro-enabled doc sample can be downloaded here MD5 : ...
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139 views

Analyzing a Composite Document File V2 Document MSI Installer malware

I have a malware to analyze with md5sum - 000cbfb28e750f2e321551c03e4fe488 When I run the command on linux : file {malware-file-name} it shows : Composite Document File V2 Document, Little Endian, Os: ...
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46 views

When is a wide-character function called?

I am rather new to reversing and currently I am trying to reverse and understand one of the malware samples that seem to be used by DPRK actors to target security researchers. https://norfolkinfosec....
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80 views

Best way from high level software developer to malware analyst

I am a software developer with commercial experience in Python and mainly Scala working on high level programming, e.g. REST APIs, and only personal/university projects experience in C++. I would like ...
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1answer
196 views

The Knowledge of Compiler for becoming a good Reverser

I just reached the the topic of Compilers in the book "Reversing:Secrets of Reverse Engineering" So, I want to ask, is the knowledge of Compilers necessary for becoming a Malware Reverse ...
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1answer
63 views

Is there an easier way to break on a rootkit driver load, other than disassembling IopLoadDriver?

The only method i know to break on a DriverEntry of a rootkit driver when its loaded is to disassmble nt!IopLoadDriver and find an indirect call in it and break on it. Setting a break point on ...
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2answers
575 views

Crash after exe modification [closed]

I am testing a malware that built as COM EXE service. This exe file has a digital signature. I succeeded to remove the digital signature for trying to modify it for reverse engineering tests. But when ...
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1answer
65 views

Using windows 10 for malware analysis

I want to ask can I use windows 10 for malware analysis, I'm asking this because I see many reversers and analysts using windows 7 for this purpose. Can anyone please guide me?
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24 views

Jumping to a specific logation for DLL injection : OllyDbg

Hypothetically, If I'm hijacking a DLL but user space is in a sandbox; upon debugging, sandbox initiates at 0x345678 and I want to move to the space before it initiates: Can I call a jmp function ...
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1answer
43 views

Shannon Entropy of Individual PE sections

Why is Shannon Entropy of individual sections always between 0-8. Also why we need to create a 256 freq array while calculating the Shannon Entropy?
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2answers
112 views

cdecl calling convention

Hello best people, my question is this example is telling me about cdecl calling convention. I have confusion that when analyzing the code in disassembly how would I recognize that this is the cdecl ...
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2answers
461 views

Fileless malware samples

If file-based malware sample can be downloaded from sites such as theZoo aka Malware DB or any sites as suggested here, what about fileless malware as it doesn't store it's copy in the hard disk? If ...
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3answers
2k views

Is Null in Windows equal to zero?

(This question refers to assembly language.) I'm a little bit confused. I've encountered many times Windows functions that are supposed to return a Handle, and if they don't they return NULL. Why ...
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1answer
789 views

Mul(Multiplication) in x64 and in x32 assembly

I'm completely new in malware reverse engineering. I'm stuck in a confusion that, I studied that in x32, mul instruction multiplies the source with eax register and store the result as 64 bit value ...
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1answer
213 views

Why does decompiling a C++ using Snowman yield some full variable names and some obfuscated ones?

I decompiled a C++ exe file using Snowman, hoping to see if it was malware or not (Although, honestly, I have no clue how to continue that - The file is really large, and the decompilation mostly ...
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3answers
6k views

Where can I get Linux malware samples?

There have been numerous sites stated in this wonderful post that one could retrieve malware samples. However, I am having a difficult time (sorry D:) locating Linux-specific malware from those sites ...
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1answer
92 views

Is this an endless loop?

I saw this part of the code in practical malware analysis. This construct is a loop for sure, but there isn't any condition. Is this an endless loop?
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1answer
134 views

Does the operating system you use matter?

people recommend windows for reverse engineering, I don't want to install windows as a virtual machine because they are laggy and I already have windows 10 as host, is it possible to use linux vm that ...
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1answer
124 views

what is Off in IDA Pro?

probably silly question, what does Off ... means in IDA Pro? i markered the snapshot as an example.
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175 views

Ransomware Source Codes [closed]

Have been searching ransomware source codes for analysis(as much as possible). I have already checked with sites like Any.Run but most of their samples are .exe and binary files. Does any one have any ...
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1answer
171 views

How can I know what the executable is missing to run?

I have extracted a presence of MZ file from memory which happen to be available in VirusTotal ( might be a malicious executable). However, I could not run the program. It seems to have some missing ...
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1answer
61 views

Structure of operand bytes in .NET call and data access IL instructions?

I tried googling but couldn't find any good source that explains the structure of memory access instructions like ldstr and call instructions for example based on experience, the last byte of API/...

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