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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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1 vote
0 answers
139 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 ...
0 votes
1 answer
275 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 ...
1 vote
1 answer
189 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 votes
1 answer
320 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 ?
0 votes
1 answer
129 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 ...
1 vote
0 answers
487 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 ...
-2 votes
2 answers
2k 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 ...
3 votes
2 answers
10k 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 ...
1 vote
1 answer
325 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 ...
1 vote
2 answers
122 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 ...
1 vote
1 answer
188 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 ...
0 votes
1 answer
291 views

2 Stage Shellcode Embedded in Doc file [Out Of Memory - Can't extract it]

So, here is the context: All start with a RTF file that has 3 objects. The first one loads a non-ASLR module "MSCOMCTL.OCX" and uses it to succed on a Heap Spray technique so it allocates enough ...
0 votes
1 answer
574 views

ELF64 Reflective Loading [closed]

I'm looking for an ELF64 reflective loader, so I can download an ELF and execute it without saving to disk? Is anyone able to point me at one please? Or a clear one for ELF32 so I can translate? ...
0 votes
1 answer
134 views

Configuring a C&C for a RAT [closed]

Where would I start when needing to configure a command and control server for a RAT? So that my dynamic analysis can be more complete. Note: I have been to the topics section of this stack exchange....
-2 votes
1 answer
86 views

Malware static rules? [closed]

Is there any sites to get static rules to detect malware files? static behavior rules for detecting malware files. Thanks in advance.
0 votes
2 answers
85 views

Composition of a Binary File trouble [closed]

I am working with some malware samples and I need to determine if one of them is primarily composed of 32-bit Intel Code. This would seem easy as I can just check the metadata describing it as a 32-...
0 votes
2 answers
4k views

How to unpack and decrypt malware? [duplicate]

Recently I have been working on reverse engineering of binary samples and executables of known malware. Most of them have been packed or encrypted. And to reach the actual data or part of the program ...
2 votes
1 answer
953 views

SWF flash analysis

An SWF file was recently detected by Windows Defender as SWF/Meadgive. I uploaded a sample to VT and only Microsoft flagged it as malicious. As of today's signatures I am not seeing any further ...
4 votes
2 answers
337 views

Analysing malware in a real environment (non-virtual environment)

I have analysed malware previously using Cuckoo Sandbox, however, I've seen that some malware won't run as they detect they are actually running in a virtual environment (they implement some anti-...
3 votes
4 answers
13k views

Unpacking and dumping using ollydump

I am trying to learn how to unpack a malware. I am trying this with ollydbg. However, when I try to dump the unpacked using ollydump plugin. It prompts the error "Bad DOS signature!!". Could someone ...
0 votes
2 answers
4k views

Recognize the library functions of statically linked executable file in IDA Pro

Recently I worked on a Linux program which has all of its symbols stripped. Opening it with IDA resulted in none of its functions identified. Thus I tried to extract any usable information from the ...
3 votes
1 answer
2k views

Resolve Addresses To Function Names

I have a malware sample that wraps LoadLibrary & GetProcAddress duo to dynamically resolve functions. After this wrapper is called the value stored in eax(which is the function name)immediately ...
4 votes
2 answers
1k views

Reversing Self-Modifying Malware

recently i got my hands on one sample that self-modifies its .text section. So, I placed a breakpoint on .text section on write operation and then continued. I found out that it zeroes out the .text ...
1 vote
1 answer
154 views

What are the overall features used in static analysis of malware? Is file property among the features used in static analysis of malware?

I was looking at the paper: "Improved Detection for Advanced Polymorphic Malware" by James Fraley who claimed to have used static, dynamic and file properties for increased malware detection. But is ...
1 vote
0 answers
2k views

Attaching to Dalvik static function using Frida in order to disable emulator detection

I have a re-occuring issue with Frida (I'm using Frida and Frida-Server for Android x86_64 ver.: 10.6.11), where I try to hook a function and override its functionality, but for some reason I get ...
2 votes
2 answers
2k views

Packed PE file and weird Header

I'm new to reverse engineering, so I don't know if my question will be easy or not. Right now I have an exe file, but it seems packed. In the hex Dump I do have the followings : 000003d0: 0055 5058 ...
0 votes
1 answer
2k views

How can I dynamically debug a malicious DLL? [duplicate]

English isn't my first language, So I will do my best ) I am trying to analyze some malware NotPetya and I can run the malware by running : rundll32.exe notpetya.dll #1 I am using Olly and trying ...
0 votes
1 answer
458 views

Getting Xrefs to Windows Library Functions in IDA Pro

Ok so let's say that a program obfuscated its IAT and i can't see it in IDA Pro. In OllyDbg there is a plugin where you press Ctrl+G you can search for a library function and set a breakpoint even ...
8 votes
1 answer
5k views

How tools like PEiD find out the compiler and its version.

How tools like PEiD and CFF explorer find out the compiler and its version. I am analyzing a executable file. Which shows: Borland Delphi 3.0 But the section names .text .rsrc. Which is usually ...
0 votes
2 answers
674 views

Manual unpacking petya ransom [closed]

I want to manually unpack red Petya ransomware. I used Ollydbg for unpacking and set breakpoint on VirtualAlloc to see the "MZ" header in memory dump, and saved it to a file. But the saved file is not ...
0 votes
1 answer
147 views

Information about packers

i was trying to search for some information about packers just to learn more about it, there is a lot of stuff out there but its hard to find something that really explain that good and clear, I would ...
1 vote
0 answers
387 views

What do malicious programs use the ESENT registry key for?

I was analyzing a piece of malware and noticed it created this registry key. hkey_local_machine\software\microsoft\ esent\process{malware file name}\debug Some googling told me that esent is just a ...
0 votes
1 answer
3k views

Extracting embedded dlls from .NET executable

I have a .NET executable that apparently has some embedded DLLs. It's just one standalone executable. I opened this executable with JetBrains dotPeek and ILSPY, both decomiplier are showing DLL names ...
3 votes
1 answer
596 views

How can I determine if a piece of code is an encryption algorithm?

I am trying to reverse engineer a malware, and came across a piece of code that I suspect is an encryption/decryption procedure, however I do not know for sure. I can recognize that it extracts its ...
2 votes
2 answers
255 views

VBA code detection in MS office documents

So, lately I've been working on a project involving malware which gets spread via MS Office documents and, among other things, I need to detect the VBA code in appropriate document streams. I've read ...
6 votes
2 answers
1k views

What PE anomalies can crash the Windows Loader or cause a file to not load?

I do malware analysis on Windows. I run hundreds of Windows PEs per day and it is actually relatively common for a file to not run (or sometimes not run on just one specific version of Windows) and I ...
1 vote
1 answer
171 views

Likely malicous Javascript-interested in how it works

Got this interesting bit of code compressed in an email named "Install-MSOffice365-WebView-Plugin-Update-0.165.11a.exe.js" that is undoubtedly malicous, but was curious what it does and am not much of ...
1 vote
0 answers
75 views

Where can I get a good description about windows build-in exe programs like wupdmgr.exe?

I was checking the Strings for Lab01-04.exe from Practical Malware Analysis and I found wupdmgr.exe and I face this every time I search for an exe. Is there any "msdn" alike repository but for exe ...
-2 votes
1 answer
2k views

Aside from Assembly, should I learn C or C++?

With Malware/Virus analysis being heavily dependant on one's ability to read the the Assembly Code generated by the Disassembler... being familiar with the Assembly Language is naturally the most ...
1 vote
2 answers
2k views

Anti-VM and anti-sandbox malware samples

I'm learning malware analysis. I'm looking for malware samples that terminate themselves when recognize working on a VM or sandbox. Thanks.
3 votes
3 answers
4k views

Detecting packed 64-bit Windows Portable Executable (EXE) files

What programs are the most useful to detect if a 64-bit PE file has been packed (main focus is on EXE files). I am not interested in the packer used I would just like to know if the file is packed or ...
0 votes
1 answer
133 views

What is the relation between binary (executable) instructions and execution instruction [closed]

What I want to know is that is there any similarity or may be difference between a binary instructions and an execution instruction of a binary ? In other world, in area of malware analysis a binary ...
0 votes
0 answers
128 views

What is the name of this technique?

A while back, on a Linux system, I found a strange binary being executed at seemingly random times with some strange arguments, briefly appearing in ps. There was nothing to be found at the usual ...
2 votes
1 answer
511 views

DGA(Domain Generation Algorithm) based malware files

Where i can get DGA (Domain Generation Algorithm) based malware files for analysis? And,Can I get malware family names which is using Domain Generation Algorithm?
2 votes
1 answer
2k views

how to overcome setunhandledexceptionfilter in ollyDebugger?

I am debugging a malware sample which is using setunhandledexceptionfilter() for anti-debugging. I don't know how to handle this. Can you guys please explain the setunhandledexceptionfilter() anti-...
-2 votes
1 answer
96 views

Need help in understanding the code of a "Malicious" file [closed]

I'm testing a malware sample : hxxps://www.virustotal.com/en/file/55f4cc0f9258efc270aa5e6a3b7acde29962fe64b40c2eb36ef08a7a1369a5bd/analysis/ This is a malicious executable file. When executed in ...
5 votes
2 answers
901 views

Safe way to download a malware payload?

I'm trying to analyze a piece of malware that is most-likely a downloader. During dynamic analysis on an isolated VM network, Wireshark registered a GET request to a server for what I believe is the ...
3 votes
2 answers
3k views

How to debug malware that injects itself into another process?

I am kind of new in the field of reverse engineering, so sorry if it is a silly question. I have to analyse some malwares for my bachelor thesis and I am currently trying to reverse engineer a ...
0 votes
2 answers
1k views

sandbox for analyzing network traffic

I am in search of looking an open source sandbox that has the following features: - route my network traffic to the sandbox for analysis - perform analysis on network traffic to detect malicious ...
1 vote
1 answer
153 views

IDA pro can not resolved section after unpacking procedure

I had a sample which was packed by a packer and I unpacked it using OllyDbg but after unpacking still IDA can not resolve the section and show most of instructions as DD. Is this sample still packed ...

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