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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1answer
899 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 ...
4
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4answers
13k 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 ...
2
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1answer
280 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
193 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?
0
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2answers
220 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 ...
0
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1answer
345 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 ...
5
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3answers
655 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 ...
5
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1answer
105 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 ...
1
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1answer
464 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 ...
1
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1answer
668 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 ...
14
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3answers
16k 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 ...
5
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3answers
190 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 ...
3
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2answers
722 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 ...
1
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0answers
81 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
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1answer
189 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
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1answer
129 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
181 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
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1answer
65 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
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0answers
283 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
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2answers
591 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
3k 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
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1answer
209 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
101 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
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1answer
163 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 ...
-1
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1answer
307 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 ...
0
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1answer
210 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 ...
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1answer
225 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
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1answer
115 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....
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1answer
82 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.
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2answers
76 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-...
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2answers
2k 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
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1answer
703 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
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2answers
238 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
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4answers
9k 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
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2answers
2k 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 ...
0
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1answer
137 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+...
3
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1answer
606 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 ...
5
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2answers
722 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
1answer
136 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 ...
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0answers
1k 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
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2answers
790 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 ...
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1answer
1k 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
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1answer
245 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 ...
5
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1answer
3k 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
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2answers
536 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
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1answer
122 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 ...
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0answers
257 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 ...
2
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0answers
637 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 ...
0
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1answer
855 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 ...