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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Reproduce compilation (ASM) output for library detection - identifying compiler, version & options used

I want to reverse a stripped x86 sample that uses a static library. So far I could identify the library itself and narrow the version of the library used. Now I want to use Ghidra's Function ID ...
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0answers
35 views

Determine what architecture a piece of shellcode targets

After some personal research I didn't find any possible way or a paper to explain how to determine what architecture a given piece of shellcode may targets. The only obvious way I found would be to ...
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3answers
298 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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0answers
49 views

Reverse engineering .NET malware - iloveyou.exe

I have a .NET malware sample whose dynamic behavior I understand. It is also packed. de4dot identified the obfuscator as .NET Reactor, so I used de4dot to de-obfuscate it. However, after de-...
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2answers
884 views

Automated Static Unpacking Binaries

I am reading the paper Automatic Static Unpacking of Malware Binaries (Kevin Coogan et al.) with the goal of trying to reproduce the given experimental results (with Hybris-C, MyDoom.q, tElock, etc), ...
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1answer
89 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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0answers
50 views

idapython - Scan all possible code paths between start and end addresses

I have a start and end address inside a function segment. How can I step through all the possible code paths easily, including jumps, function calls, etc that occur between the start and the end point?...
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0answers
50 views

How can I extract resource images from Visual Basic 6 Malware

I am reverse engineering some malware that is written in VB6. I found this tool which tried to decompile the .exe, but I noticed that the image that is being loaded by the .exe is suspicious and I ...
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1answer
117 views

Detecting cracked Themida packed malware

I'm working in a large SOC and my manager has tasked me with finding some way to provide coverage for Themida packed malware samples. As alluring as it is to suggest just blacklisting all Themida ...
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1answer
69 views

Difficulty in debugging with dnSpy

I have a dotnet malware sample that I'm trying to debug with dnSpy. It has string obfuscation (contains function names such as BarriersBottomed, etc.) I cleaned the sample using de4dot and renamed ...
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0answers
33 views

Replacing a function call with it's result in a script

I'm working with a heavily obfuscated Autoit malware script and one of the major problems is that almost all variables and lines of code are obfuscated by a custom function. The problem is that this ...
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3answers
201 views

Most efficient way to begin analyzing malware binary

I'm taking a reverse engineering course and the class has just been given a big project where we have to analyze a packed malware binary. I am using a Windows 10 VM. I am a little confused on where to ...
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14answers
107k views

Where can I, as an individual, get malware samples to analyze?

It seems that a popular use of software reverse engineering skills is to reverse malicious code in an effort to build better protection for users. The bottleneck here for people aspiring to break ...
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2answers
292 views

What's happening in the assembly main function?

I'm currently inspecting a 32-bit malware executable in a WinXP VM using IDA Pro (free version). I don't understand what's happening in the main function here. Where should I set the breakpoints (...
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2answers
77 views

capturing the sub processes's PID of a process

When a program is executed, some processes may be created by the parent process. Especially, if a program is malware, created (or forked or even injected) sub-processes will be named as a systemic ...
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1answer
51 views

what does BYTES_REVERSED_HI and BYTES_REVERSED_LO in an PE signify

How can these pe attributes be used to identify malware. I was going though a paper link at page 10 he mentioned. "BYTES_REVERSED_HI and BYTES_REVERSED_LO both make ideal candidates as a primary ...
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2answers
3k views

Alternative to CaptureBAT on Windows 7?

I am working on some malware that currently only runs with Windows 7 is detected. I would like to use CaptureBAT, but it doesn't work on Windows 7 (with the exception of network monitoring). Is there ...
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2answers
114 views

CreateThread returns true but thread doesn't run [closed]

I have a PE executable which uses threads to handle most of its functionality. It uses CreateThread API to spawn local threads to handle functions. The call to the CreateThread returns a valid handle ...
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2answers
130 views

Emotet invoice, what is the embedded file inside the word document

This pastebin hosts current URLs hosting the fake invoice of Emotet malware, which is the dropper part of the malware. The document is a Office Open XML, and there are two large non textual segments ...
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1answer
90 views

ida pro issue debugging issues with ntdll [closed]

I am using IDA pro to follow along a youtube video of RE from OALabs. https://www.youtube.com/watch?v=kdNQhfgoQoU&t=1575s I am facing a problem when i try to put a break point on functions in ...
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2answers
183 views

Manually unpacking DarkTequila, stumped. Can anyone help?

The malware is packed w/ UPX - can see 0/1 in sections. Sure, I can can a tool or even use UPX -d -o flags .exe to create an unpacked copy with a >97% ratio, however I want to MANUALLY unpack it to ...
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1answer
491 views

How to convert Unexplored data in IDA Pro to code?

I am analyzing a malware, it has a lot of confusing methods, I wrote an idc script to remove confusion, use the MakeCode() function to convert some Unexplored data into code, but there are still some ...
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1answer
61 views

Reverse engineering Infostealer.Dyre

I'm a newbie to malware analysis and reverse engineering in general. I got hold of a Dyre malware sample from theZoo on GitHub and I've been trying to analyze it. I've put up my analysis report here. ...
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1answer
842 views

Good foundation for reverse engineering malware

I have been intrigued by reverse engineering recently and just finished Paul Carter's PC Assembly Language book (http://pacman128.github.io/static/pcasm-book.pdf) which was a great primer for x86. My ...
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4answers
9k views

Finding OEP in a VMProtect v3.0 protected malware

I've been trying to reverse engineer a malware that has been packed with VMProtect v3.0. My first instinct was to google an automated way for this and I found a script. Unfortunately the script to ...
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1answer
195 views

General unpacking of packed malware

I did a brief survey on malware unpacking and I found several theses on automated general unpacking:Eureka, PolyUnpack, omniUnpack, Malware Normalization. However, these theses are written years ago ...
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1answer
127 views

Finding a specific malware sample [closed]

I am trying to find for analysis the scuinst.exe binary (R2D2 aka Bundestrojaner), but I can not find it. Where can I find this binary?
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2answers
198 views

Can benign applications have such APIs?

I am new to malware analysis .. and I was analyzing some 'windows' apps and found functions that I thought it exist only on malware, is this possible or there is something wrong with my analysis ? I ...
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1answer
338 views

How do I make a YARA signature that does NOT look in the resource section?

I'm trying to use YARA to sort out a variety of files into families. Some malware drops other malware from images within their resource images. What I'd like to do is write a signature that ignores ...
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3answers
562 views

Is there any websites to get malware files using YARA rules?

I want to know, Is there any websites which has malware files (Windows OS) that are detected by YARA rules? Note: I know some websites to get android malware samples using YARA. But, I need Windows ...
5
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3answers
2k views

Where can I find benign samples with a high potential to false positive?

In the pursuit and development of malware detection algorithms, often a big sample set of both malicious and benign samples is required. Both machine learning or similar automated techniques, as well ...
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0answers
87 views

Using yara to obtain information from binary (not matching)

I would like to use yara to extract information from a binary. I went through the doc but did not understand how to always get a certain piece of information. For example: import "dotnet" rule ...
5
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1answer
97 views

How can you explore behavior in malware that is not being performed?

I have a malware sample that I know is acting as a bot and connects to a botnet. The problem is that it uses no known protocol that I am familiar with (it's IRC-like) and doesn't actually do anything ...
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1answer
367 views

bypassing anti-VM inside protected samples

This is a good starting point. As you know: Sandboxes and virtual environments (hypervisors) are full of artifacts that betray their analysis environment. Malware can protect itself against these by ...
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1answer
389 views

What location is this and what does it signify - “d:\w7rtm\minkernel\ntdll\ldrinit.c” [duplicate]

Came across this while debugging a exe. Cant find much on it anywhere so thought I'll put it up here. Any ideas as to what this could be used for? CPU Disasm Address Hex dump Command ...
13
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3answers
15k views

Difference between DllMain and DllEntryPoint

I have a piece a malware I was share with. (I do this for fun, anyways) Is a DLL according to the IMAGE_FILE_HEADER->Characteristics. I was trying to do some dynamic analysis on it. I have done the ...
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3answers
163 views

Finding a malware object inside PE file

Today my AV found an antique piece of malware called Win9X.CIH.dam. Instead of just removing it I would like to make a little research for fun. What does "data0513" exactly mean? I can't understand ...
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2answers
543 views

Why hook a function rather than set a breakpoint

I know hooking is usually used as a technique when one would rather use external (or injected) code to manipulate an executable, vs breakpoints which are usually set by a debugging framework in an ...
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0answers
50 views

Decompiling DotNet2JScript malware?

I've got a .NET malware sample that was transpiled to JScript using DotNet2JScript. The .NET malware assembly was serialized to binary form using BinaryFormatter and then embedded into the JScript ...
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1answer
161 views

Pyemu - cannot use PEPyEmu() module, Python

I want to run code from Gray Hat Python book for upx_unpacker. I have downloaded PyEmu, but when I run script I got this error: AttributeError: PEPyEmu instance has no attribute 'load' My script use ...
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1answer
115 views

Rootkit.Fileless.MTGen Reverse Engineering

Has anyone tried seeing what's inside of this malware? It ended up on one of our work machines. I copied the files to a thumb drive before setting the machine up for reimaging. Though the AV software ...
2
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1answer
159 views

How to detect overlay data in RTF files?

How to detect overlay data in RTF files? When officemalscanner says it detected overlay data, what does that mean ? Is overlay data specific to malicious files ?
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1answer
55 views

Identifying code that accesses encrypted overlay in PE

I’m reviewing a malware sample that stores an encrypted PE file in its overlay. I’m attempting to identify in IDA pieces of x86 that may be responsible for accessing the overlay and performing the ...
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0answers
192 views

ELF .text infection test

I'm trying to implement an example of an ELF .text infection as described in "Learning Linux Binary Analysis". I'm currently having a problem where I successfully injected my data into the .text ...
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2answers
418 views

How can I export only the mnemonics from objdump (or any other program)?

I want to do an analysis with the mnemonics. I can export everything to text but I only need the last column. Any idea on how can I solve this? In other words of this output of objdump (objdump -d ...
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2answers
1k views

Dumping dll out of process

So there is executable malware, what when opened downloads dll from server or so and injects into target process. I checked properties of the target process in process hacker and clicked on .NET ...
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1answer
149 views

De-obfuscation - Emulation-oriented vs Script-oriented

What are the advantages of each method when employing de-obsfucation of potentially malicious code? I've been told to always use emulators like x86emu since it doesn't actually run the code when ...
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2answers
97 views

Test malware files in host machine?

To analyze malware files we are using virtual machine and virtual box but some of malware detect the environment and will not do its work properly. I want to know how to test malware files with out ...
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1answer
152 views

Which RE tool is missing?

I am analyzing a malware at the moment which scans for a lot of filenames and ClassNames to recognize if it is under supervision or not. My problem is, that all the filenames and ClassNames are ...
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1answer
212 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 ...