Percer

Percer is a Portable Executable (PE) file format dissection utility and library which I use to quickly get information about Windows executables. Percer functions as both a command-line interface (CLI) utility and a library, allowing researchers to extract key information from PE files (metadata, sections, imports/exports, certificates). It comes with a VirusTotal search functionality which enables the user to run custom queries and download files.

🌟 Features

• Dual Mode: Operate as a standalone tool or integrate as a library.

• PE Analysis: Parse Imports, Exports, Sections, and Certificate information (wraps around Python pefile).

• VirusTotal Integration: Query file hashes and download samples to files / byte streams.

• Flexible Inputs: Analyze local files by path or remote samples by hash.

🛠 Installation

Install Percer from the source code.

# Clone the repo
git clone https://github.com/lem0nSec/Percer.git

# Navigate to the directory
cd Percer

# Install dependencies and package (Windows)
py -m pip install .

📖 Configuration

Percer VirusTotal searching functionality requires a valid API key which has to be set as environment variable.

• Windows (cmd)

set VT_API_KEY=API_key_goes_here

• Linux

export VT_API_KEY='API key goes here'

🚀 CLI Usage

Percer provides a simple command-line interface.

Help Menu

C:\>percer --help
usage: percer <PE file> [-h] (-F FILE | -H HASH) [-a] [-e] [-i] [-s] [-c] [-q]

options:
  -h, --help            show this help message and exit
  -F FILE, --file FILE  Target file
  -H HASH, --hash HASH  Target hash (VirusTotal Search requires VT_API_KEY)
  -a, --all             Show all info
  -e, --exports         List exports
  -i, --imports         List imports
  -s, --sections        List sections
  -c, --certificates    Get certificates information
  -q, --quiet           Do not print the banner

Examples

Analyze a local file

percer -F samples.exe

Query hash on VirusTotal

percer -H <sha256/sha1/md5/Authentihash>

CLI output preview

📦 Library Usage

Percer can be imported into Python projects.

from percer.analyzer import PEAnalyzer
from percer.virustotal import VirusTotal

with open('hashes.txt', 'r') as f:
  hashes = [line.strip() for line in f]

with VirusTotal() as scanner:
  for input_hash in hashes:
    try:
      content = scanner.get_content(scanner.resolve_hash(input_hash))
      pex_object = PEAnalyzer.from_bytes(content)
      print(f"Product Name of {input_hash} is {pex_object.product_name}")
    except Exception as E:
      print(E)
      pass