Questions tagged [static-analysis]
Static analysis is the analysis code without actually executing it. This is in contrast to dynamic analysis which executes the code.
199
questions
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What is the difference between a file on disk and a file on memory?
Currently, I am learning about the differences between static and dynamic analysis. I have come across this incredible question that has been bugging me: What happens to the file (in memory) when you ...
2
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1answer
82 views
Help regarding XOR game decryption algorithm
I'm currently trying to reverse engineer the decryption algorithm for an old online game, using a chat message packet, as it contains text which is easily recognizable.
I used a packet sniffer to get ...
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0answers
72 views
the parameter of the function
i was given the following asm code:
fx:
push rbp
mov rbp, rsp
mov DWORD PTR [rbp-4], edi
mov eax, DWORD PTR [rbp-4]
sal eax, 3
cmp ...
0
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1answer
59 views
Why might nm find a few undefined symbols that I can't see with xxd?
I'm cross-comparing a few approaches to testing for binaries that import a symbol and I noticed a YARA rule not finding one in sudo that nm + grep could find.
I looked at it in xxd to figure out why, ...
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1answer
128 views
Arrays assembly
I'm reversing my C array's programs where I'm storing numbers in arrays like this...
int marks[5];
marks[0] = 1;
marks[1] = 3;
marks[2] = 2;
marks[3] = 7;
marks[4] = 9;
so the compiler showing me the ...
2
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2answers
116 views
Why this ASM represents Virtual Function call?
I'm referring to this question that was asked previously:
Virtual functions call asm
I'm wondering how is it possible to know whether this ASM listing represents Virtual Functions calls? What's in the ...
2
votes
1answer
77 views
Not able to understand the C-switch statement in disassembly
While I'm trying to disassemble my own C code I am stuck in a problem of not understanding how this Switch statement is implemented in assembly code. Can anyone please help to figure it out? This the ...
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1answer
64 views
Difference between \n, \0, \x00 and data from /dev/zero when performing a buffer overflow?
I am working with a binary that involves a buffer overflow on two contiguous memory blocks allocated with malloc. The binary filles up the first buffer with whatever the user inputs and hardcodes the ...
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42 views
Using GDB to find the address of a buffer in a stripped C binary
I am working with a crackmes binary called Simple Overflow. It has two buffers with sizes 0x10 and 0x8, and it uses malloc to allocate two contiguous memory blocks (see <+25> and <+39> on ...
0
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1answer
54 views
How to simplify a function “calling itself's reference”
I encounter often a function calling itself (in the pseudo code) such as:
result = (**(__int64 (__fastcall ***)(volatile signed __int32 *))lambda)(lambda);
Since the disassembly is call qword ptr [...
0
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1answer
55 views
Is it possible to make a dynamic memory allocated .data segment to static in a file?
Sorry if this is a dumb question I'm new to assembly.
Basically I want to modify a function in a .exe file to return with a different data, but my issue is that the memory location of the data segment ...
3
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2answers
72 views
How to figure out functionality when doing Static Code Analysis in ASM?
When doing Static code analysis on a disassembled app, I usually end up seeing many calls to registers (CALL EAX for example), which is constructed in runtime, which leaves me clueless on how to ...
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2answers
45 views
Lifting exported function instructions in PE files
I am trying to automate analysis of instructions within exported functions for a .DLL and need to be able to lift the first few instructions for the entry point of each exported function statically ...
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4answers
89 views
finding sequence of opcode in binary
I have dis-assmebled binary and want to check if it contains particular sequence of opcodes(obtained from other reference binary). how to do that . i know plain byte
level comparison wont work as as ...
0
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1answer
64 views
How can I find a value in Tricore(TC1766) Arch?
I recently work on Tricore Processor, but I have some problems.
With reading memory value. I do not know if I am right or not, but I think a part of flash memory copied to RAM and now in my algorithm ...
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0answers
44 views
How to use aarch64 call convention to understand an unknown function?
I’m trying to reverse engineer an aarch64 Golang binary which happens to call a symbol, i.e., function named guess_me which is an import. To stop the binary from throwing errors, I write a Hello World!...
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0answers
81 views
Delphi mt38 CRC (Tricore 1766 Arch)
I want to calculate CRC32 for Delphi mt38 and found the below assembly algorithm and converted it to C. It seems that this algorithm is defined for n = 256 or 1024. I want to calculate CRC32 for n = ...
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0answers
30 views
How can I tell whether or not a given library method is being referenced by a consumer program statically in OOP languages?
Preface: This question is about source code reverse engineering and static analysis. Meaning, there is no built code available but I have access to the source code of the program.
Imagine I'm looking ...
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0answers
71 views
CRC16 Reverse in C166 Arch
Before that I asked about piece of code that used in this algorithm (here). Now I have a bit problem with the rest of algorithm.
So I have to describe this with detail. Sorry if i vast your time for ...
0
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1answer
62 views
Static Binary in Windows
I am learning more about binary exploitation on windows. But I saw while revering a binary that you can create static binaries in windows too just like in Linux. It was really ugly. if I would be on ...
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0answers
35 views
Strange memory allocation behaviour
I'm currently working on a modding library for a particular game, and I have come across a part of the menu system that I can't figure out the purpose of.
The expression in question is this:
unsigned ...
0
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1answer
64 views
Password evaluated from the sum of ASCII letters
After analyzing the code, I have been able to understand and recreate the algorithm used to check if the password the binary takes is correct, but don't know how to solve it (or at least can't think ...
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1answer
196 views
The C166 family code meaning
What the meaning of this code with an explanation?
sub_37C2:
mov r5, r4
shr r5, #14
shl r5, #1
mov r5, [r5+0FE00h] ; DPP0
bmov r4.14, r5.0
bmov r4.15, r5.1
shr r5, #2
rets
; ...
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2answers
125 views
Is manually converting/decompiling x86 source code to C/C++/etc… considered reverse engineering?
I have the source code of an old program written in 32-bit x86 assembler that I am working on manually rewriting in C.
The first time someone asked me about this project I told them I was 'reverse ...
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0answers
41 views
Statically injecting translated NASM assembly into existing ELF binary
I'm trying to statically patching ELF binaries in order to incorporate code that can help provide run-time protection.
In an effort to save time writing and debugging assembly, I took the following no-...
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22 views
Symbols for detecting UBSan
I am looking for the symbols that reveal if a specific binary was compiled with UBSan.
Unfortunately, Checksec is not able to detect it.
So, I have compiled the snippet reported in the official doc.
...
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0answers
59 views
Immediate offset LDR in presumed malloc function looks wrong in static analysis
I am attempting to disassemble a ROM image for a BCM4366C [1] after reading a blog post where researchers reversed some other Broadcom chips [2] . I have analyzed the ROM image in Ghidra and I have ...
0
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1answer
35 views
What is this line and how to remove it
I tried to unpack packed_dll, when the unpack stage done, i dumped unpacked_dll out and start to reverse. I pretty sure this is continuously function of that dll but this line show up. So what is this ...
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1answer
119 views
How can I analyze this code? [closed]
I wanted to analyse the code for some functionality.
in my understanding the code contains a logic handling intents with extras. I want to know how these Works! and also how can I pass extras using ...
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0answers
110 views
Removing/bypassing a BIOS whitelist
I am trying to bypass or erase the BIOS whitelist on my Thinkpad T440p. So far I've
used flashrom and a soic8 clip to dump the bios to a bios.img file
made another dump and compared with diff bios....
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0answers
144 views
What are the known techniques used by wrappers and obfuscators to protect against decompiling?
I am NOT looking to make my application 99% safe, nor my goal is to prevent a a determined reverse-engineer to disassemble it, but simply is to protect my source code from lambda user with little ...
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1answer
81 views
ida identifies library function as regular function
I'm trying to find libc symbols in some Windows 32-bit application. For some reason, Ida autoanalysis didn't recognized code that comes from libc as "library function", but as a "regular function". ...
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0answers
56 views
ARM chip gpio/ identification from firmware code
Device: i was able to recover bricked Chinese IOT a Sous Vide cooker. Replaced damaged capacitor. it works.
it has
ARM soc/mcu/processor
WI-FI (broadcom)
LCD touch screen + 16bit STM mcu.
EEPROM ...
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1answer
52 views
methods that have zero usage in jadx?
so i've been reversing this ai assistant app to figure out what kind of forensic data it leaves on local file system. during static analysis with jadx-gui i found some interesting methods that take ...
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1answer
165 views
Dynamic analysis (Frida) reveals instance of a class that doesn't exist in the source code (dex2jar)
I have been diving into an apk's source code, doing both static analysis with Jadx (same as dex2jar) and dynamic analysis with Frida.
I am trying to replicate the method that signs HTTP requests "...
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0answers
38 views
static analysis for identifying backdoors
I am doing a research in identifying backdoors in windows .exe files. Currently I found some methods to detect.
1.String search in .exe
2.find Reffrence .dll and win32 Api calls using import table
...
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0answers
36 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 ...
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1answer
600 views
Find functions signatures in Ida?
I didn't understand the subject of find function in Ida via signature.
If I understand well that way helps to recognize libraries functions in static binary(in dynamic binary I can see the functions ...
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1answer
64 views
PE file export functions of packed file
I am new to reverse engineering and I am learning about packed files.
I saw that most of the time I can recognize a packed file with a little number of import functions in PE file and not many strings ...
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0answers
32 views
How does BAP- BinaryAnalysisPlatform helps for reverse engineering
I saw the BAP- BinaryAnalysisPlatform as a helpful tool for reverse engineering.
Can you please explain me how does this BAP, helps for reverse engineering (I already use Ida pro)
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1answer
172 views
Find all syscall in statically Arm Binary
What is the easy and fast way to find all syscall in statically Arm binary ?
Is there any Ida plugin that do that?
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0answers
47 views
Python based static c analysis tools
I want to analyze some open-source C code, and I'm looking for a static analysis python library for C, preferably open-source. Any ideas/suggestions, based on your experience?
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1answer
108 views
Get function return value
any idea for more ways to get return value?
(no hooks, no hw/memory breakpoints, no call functions)
thx :)
tried to find dword maybe that hold the function return, didn't found.
I'm trying to create ...
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0answers
14 views
Locating Exit/Abort Functions from Static Analysis
Similar to this question, I'm interested in locating exit and abort style functions in a firmware - any function call that in fact terminates the execution, by statically analyzing the firmware.
My ...
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1answer
84 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 ...
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1answer
165 views
How to extract static API sequences of a PE file?
How does one extract the static API sequences of a PE file? I don't mean the imports listed in the imports segment.
I am currently using different RE tools like Ghidra, IDA Pro, and Binary Ninja. ...
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0answers
38 views
IDA Pro SP tracking
I am reversing a BIOS and its code extensively uses SP register for 16-bit return addresses (and also things like "bswap ESP" to obtain a "two-level-deep" stack, and rarely "mov mm7, esp" to obtain a "...
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1answer
275 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, ...
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1answer
114 views
Detecting libc function with IDA
I have binary than running on Arm , static and striped.
I don't know which compiler compiled this binary.
How can I identify function like fread sleep printf ioctl
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1answer
102 views
Memory map in AVR Harvard architecture
In this video https://youtu.be/D0VKuZuuvW8?t=259 .
You can see that flash address is beteen 0x0 to 0x3fff. and Data memory ( Io register and SRAM ) is between 0x0 to 0x8ff .
So in the video he ask ...
