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.

Filter by
Sorted by
Tagged with
0
votes
1answer
59 views

what is Off in IDA Pro?

probably silly question, what does Off ... means in IDA Pro? i markered the snapshot as an example.
0
votes
0answers
68 views

IDA IDC script does not seem to work

I am trying to measure code coverage for a malware sample linked here. I am using DynamoRIO's(7.1.0-1) drcov utility to get an ASCII log. The log file is linked here. I am then using Dynapstalker to ...
0
votes
1answer
60 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 ...
-1
votes
2answers
86 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 ...
1
vote
1answer
67 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 ...
2
votes
1answer
46 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/...
1
vote
0answers
43 views

Ways of creating a new thread on Windows

I'd like to know about every possible way how a thread can be created in a process at the lowest possible level. There are loads of WinAPI-s to create a thread, but as far as I know all of them ends ...
0
votes
0answers
52 views

Bypass anti memory dump with process hacker and dump the malware?

I have a malware that has some sort of anti dumping technique, so when i dump a region of memory with process hacker it dumps a 0 byte file, i am also running the process hacker as a unrestricted user ...
4
votes
1answer
109 views

Why does PE ImageBase address change in memory?

I'm reversing a malicious 32-bit x86 Windows executable. Statically reviewing PE headers in Ghidra, I see that ImageBase is set to 0x400000 as expected. However, when the binary is loaded into memory, ...
0
votes
0answers
22 views

How to check in IDApython that if a call is an API/Library call or not?

I want to check for every call instruction whether its an API call or library call (statically linked that flirt recognized) The only solution i found is this : Finding all API calls in a function but ...
0
votes
2answers
76 views

How does an executable’s static API differ from it’s dynamic API?

Running an executable in Cuckoo sandbox gives me its dynamic API information. How do these API calls differ from their static API information (eg. If I were to just put the executable through IDA Pro ...
1
vote
0answers
32 views

How are AutoIT variable names stored after compiling it to a executable?

I need to write a yara rule for a autoit malware (the binary itself not the decompiled script) As far as i know the actual script is in the resource section in the RCData, but how can i find the bytes ...
1
vote
1answer
106 views

How to know where a sequences of bytes are used in a .NET application with Dnspy?

There are a sequence of bytes that i need to find out where are used in dnspy i tried going to hex editor and found the bytes, but right clicking and saying go to code or structure or follow reference ...
0
votes
1answer
58 views

Debugging Encrypted Malware with Multiple Threads

What is the best approach when debugging a multithreaded program that is yet to be encrypted? Where is the best place to put Breakpoints using Ollydbg?
-3
votes
1answer
118 views

How to reverse engineer apks? [closed]

is it possible to reverse engineer an apk just to unlock hidden/unreleased features?
-1
votes
1answer
56 views

Force debug Administrator Malware

I want to analyse a malware that do not run without administrative previliges. I know it is risky but still. How can I debug it with debugger as from entry point? Because debugger could not start ...
1
vote
1answer
63 views

Code based Yara rule

I have to write a Yara rules for malwares that is based on assember code. Suppose I have an unpacked malware sample. To avoid false positives, the selected code must be unique. Can anyone tell me ...
0
votes
0answers
985 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 ...
0
votes
0answers
32 views

How to view all of the struct member values in IDA pro?

The problem i am having in reading the struct values is that in the decompiler, when the struct is too large i cant view all the values when i hover over the structure member : Tried viewing these ...
0
votes
2answers
76 views

Is there any way to write a IDA script that finds constant values used in all functions, no matter the instruction?

So lets say i have these type of instructions in functions : x == constant value x = constant value x > constant value no matter if its just an assignment or compare or anything, i want to get the ...
0
votes
0answers
34 views

Is there any tool that finds common things like strings among large number of binaries?

So this is really needed in malware analysis, for example if i have 1000 samples from a family and i want to know which strings are common among all of them, it would really help to have a tool that ...
0
votes
1answer
74 views

Malware attempting to move a value into $zero in MIPS?

Recently I have been trying to reverse engineer an IoT malware called NyaDrop using IDA. There I came across this mysterious assignment a few times. addiu $zero, 0xA as well as move $at, $at ...
1
vote
2answers
161 views

What does objdump -b binary means?

So I have started to digging in malware analysis and I came across with some malware samples that I couldn't disassembly with objdump. More specifically I use objdump -dS /path/to/malware and I got ...
0
votes
0answers
17 views

Passing file through inetsim

I have a piece of malware that downloads a config file from a google drive link, and I want to determine how the config file is used and where it beacons to without running the file connected to the ...
0
votes
3answers
90 views

What is the best way to change the call-graph of a PE file without changing its real behavior and without packing it?

What i want to do is take a PE file, extract its call-graph, and then inject a junk function in it, so for example by injecting a junk function inside of it, and changing a call instruction's opcode ...
0
votes
3answers
152 views

How To Identify Which Process Is Being Written To With WriteProcessMemory?

Basically, I cannot find which process is being written to when WriteProcessMemory is being called. Currently I'm Setting Breakpoints on WriteProcessMemory and OpenProcess. However, the process handle ...
0
votes
1answer
74 views

Can relative offsets in instructions like call and jmp change after recompiling the same code, or running it in another computer?

So let's say we want to use some instructions as signature for a malware, and it includes some call instructions or jmp instructions. Now, as far as I have seen, they always contain relative offsets ...
1
vote
1answer
31 views

Android dynamic UI state inspection/profiling tool

I am looking after for a command-line tool that can perform dynamic view hierarchy analysis similar to the UI tool in Android Studio https://developer.android.com/studio/debug/layout-inspector. Is ...
2
votes
1answer
67 views

How to “unprotect” malicious workbook without knowing password

Right now I'm looking at an office document (most likely rtf based on it exploiting equation editor) that opens just fine when you double click it, but on further examination in a hex editor and in ...
0
votes
1answer
31 views

Linux encryption/luks/pymouth password scripts corruption

I noticed that the bootup scripts that collect the password for full disk encryption on linux (fedora-31) were displaying corrupted text. The kind that looked like binary data being printed at text: ...
0
votes
1answer
222 views

Obfuscated VBE malware script analysis

Some actions of this script are clear e.g. the section that adds firewall rules, others not so much On Error Resume Next F27 F10 A0 DBCF Sub F27() Dim E13C563AFCB34, C0009B48F34B, C8, ...
1
vote
0answers
42 views

How does this wannacry sample work?

I downloaded wannacry sample here: https://github.com/fadyosman/WannaCrySample/releases. Don't forget to enter password for archive. I figured out how most of the binary works, except the very last ...
3
votes
1answer
153 views

CreateTimerQueueTimer arguments differs from WinAPI

I was reading a man page about CreateTimerQueueTimer. BOOL CreateTimerQueueTimer( PHANDLE phNewTimer, HANDLE TimerQueue, WAITORTIMERCALLBACK Callback, PVOID ...
2
votes
1answer
166 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 ...
1
vote
2answers
832 views

Why Windows Defender is not able to get rid of this trojan?

Every time I start my PC, Windows Defender shows a notification saying that the virus Trojan:Win32/Ceprolad.A was deleted, which means indeed that it wasn't, as most antivirus I've tried these days (...
1
vote
0answers
74 views

API Hiding Issue

I'm trying to analyze a malware which is hiding API names. When I open it with CFF Explorer, except a few API like GetProcAddress, nothing appears. Basically, I know how API hiding works. I set a ...
1
vote
3answers
187 views

What is the difference between malware that is 'dumped' and one that is 'unpacked'?

On malware sharing communities, I have been noticing that the samples shared are marked as unpacked or dumped. I have tried to load the dumped malware in IDAFree, however, there is nothing in the ...
0
votes
1answer
55 views

What is the best approach for using IDA's remote debugger for analyzing a sample with two VMs?

Sorry if this is a stupid question but couldnt find the answer by googling Right now I analyze a malware by using remote debugger of IDA, and i run the debugger on a isolated VM that has shared a ...
0
votes
2answers
103 views

Tools for detecting packing and encryption

I'm doing a cert in malware analysis and I'm looking for some up to date tools to automate detection of packing and encryption to aid the reversing process. I've found TitanMist however it seems ...
0
votes
2answers
68 views

How to Calculate ds Pointer

How do I calculate the location of the string in this sample located at offset 0x1CAD8? The instruction at 0x140001A97 in the sample is: 0x140001A97 F2 0F1005 39C60100 movsd xmm0, qword [rip + ...
2
votes
2answers
113 views

Malware Samples that defeats emulators by using uncommon API calls [closed]

I am looking for a few malware samples that detects sandboxes using uncommon API calls. I understand that one of the drawbacks of OS emulated sandboxes is that the malware can use uncommon API calls ...
2
votes
1answer
146 views

Unable to properly analyze a very simple C-compiled program

I'm a RE beginner and I decided to start writing my own simple code for practice. I wrote a simple code which uses a winAPI function called CreateProcess to start a calc.exe, I've wrote it in C and ...
2
votes
1answer
177 views

Recognize a decryption algorithm

I'm trying to reverse a malware that builds its IAT at runtime. Due to my inexperience, I'm having trouble to understand this function that accepts into EAX a dword (maybe some sort of hash) and into ...
1
vote
1answer
89 views

Difficulty obtaining malware traffic

I'm trying to get a particular piece of malware to beacon, and I have my box connected to remnux, with inetsim and fakedns running. Using this setup I have been able to acquire good pcap from most ...
2
votes
1answer
116 views

How to hide a process from all the methods of getting the list of processes?

So it seems that there are a lot of ways of getting the process list, although I'm not sure whether in the low level do they acquire them from same place or not so these are the ways i know : ...
-1
votes
1answer
81 views

malware analysis [closed]

I tried to use process monitor to find out what program 4.exe did on my system. However, I could not find what changes were made. I believe that this program modifies some files and the registry, but ...
2
votes
1answer
266 views

Start vs WinMain()

I am trying to analyze a malicious DLL and when I loaded it in IDA, I can see two functions - DLLEntryPoint and DLLMain. I then proceeded to change the format by switching the characteristics bit that ...
0
votes
0answers
208 views

IDAPython - Find the start of an undefined code blob

I'm currently working on an IDAPython script that aims to remove various rogue-byte from the malware that I'm reversing. I'm in a case where some portions of my code contain this type of anti-...
1
vote
3answers
858 views

Cyber security student wanting to start learning reverse engineering [duplicate]

I'm really interested in learning reverse engineering. Especially in regards to malware. Any help is much appreciated What should I learn before I start to learn reverse engineering? Is learning C/...
1
vote
0answers
113 views

Reverse Engineering Android ROMS to detect malicious code

I'm working on reverse Engineering Android ROMS (Firmware you can flash onto your phone) so that I can scan them for malicious behavior. I've been looking all over the internet but unfortunately I'm ...

1
2 3 4 5 6