supp-chai-malw-artf

name	supp-chai-malw-artf
description	Investigate supply chain attack artifacts including trojanized software updates, compromised build pipelines, and sideloaded dependencies to identify intrusion vectors and scope of compromise.
domain	cybersecurity
subdomain	malware-analysis
tags	["supply-chain","malware-analysis","trojanized-software","solarwinds","3cx","dependency-confusion","software-integrity"]
version	1.0
author	mahipal
license	Apache-2.0
atlas_techniques	["AML.T0010","AML.T0104"]
nist_ai_rmf	["GOVERN-5.2","MAP-1.6","MANAGE-2.2"]
d3fend_techniques	["Platform Hardening","Hardware Component Inventory","Restore Object","Electromagnetic Radiation Hardening","RF Shielding"]
nist_csf	["DE.AE-02","RS.AN-03","ID.RA-01","DE.CM-01"]

Analyzing Supply Chain Malware Artifacts

Overview

Supply chain attacks compromise legitimate software distribution channels to deliver malware through trusted update mechanisms. Notable examples include SolarWinds SUNBURST (2020, affecting 18,000+ customers), 3CX SmoothOperator (2023, a cascading supply chain attack originating from Trading Technologies), and numerous npm/PyPI package poisoning campaigns. Analysis involves comparing trojanized binaries against legitimate versions, identifying injected code in build artifacts, examining code signing anomalies, and tracing the infection chain from initial compromise through payload delivery. As of 2025, supply chain attacks account for 30% of all breaches, a 100% increase from prior years.

When to Use

• When investigating security incidents that require analyzing supply chain malware artifacts
• When building detection rules or threat hunting queries for this domain
• When SOC analysts need structured procedures for this analysis type
• When validating security monitoring coverage for related attack techniques

Prerequisites

• Python 3.9+ with pefile, ssdeep, hashlib
• Binary diff tools (BinDiff, Diaphora)
• Code signing verification tools (sigcheck, codesign)
• Software composition analysis (SCA) tools
• Access to legitimate software versions for comparison
• Package repository monitoring (npm, PyPI, NuGet)

Workflow

Step 1: Binary Comparison Analysis

#!/usr/bin/env python3
"""Compare trojanized binary against legitimate version."""
import hashlib
import pefile
import sys
import json


def compare_pe_files(legitimate_path, suspect_path):
    """Compare PE file structures between legitimate and suspect versions."""
    legit_pe = pefile.PE(legitimate_path)
    suspect_pe = pefile.PE(suspect_path)

    report = {"differences": [], "suspicious_sections": [], "import_changes": []}

    # Compare sections
    legit_sections = {s.Name.rstrip(b'\x00').decode(): {
        "size": s.SizeOfRawData,
        : s.get_entropy(),
        : s.Characteristics,
    }  s  legit_pe.sections}

    suspect_sections = {s.Name.rstrip().decode(): {
        : s.SizeOfRawData,
        : s.get_entropy(),
        : s.Characteristics,
    }  s  suspect_pe.sections}

    
     name, props  suspect_sections.items():
         name   legit_sections:
            report[].append({
                : name, : ,
                : props[], : (props[], ),
            })
         (props[] - legit_sections[name][]) > :
            report[].append({
                : name, : ,
                : legit_sections[name][],
                : props[],
            })

    
    legit_imports = ()
     (legit_pe, ):
         entry  legit_pe.DIRECTORY_ENTRY_IMPORT:
             imp  entry.imports:
                 imp.name:
                    legit_imports.add()

    suspect_imports = ()
     (suspect_pe, ):
         entry  suspect_pe.DIRECTORY_ENTRY_IMPORT:
             imp  entry.imports:
                 imp.name:
                    suspect_imports.add()

    new_imports = suspect_imports - legit_imports
     new_imports:
        report[] = (new_imports)

    
    report[] = (legit_pe.OPTIONAL_HEADER.DATA_DIRECTORY[].Size)
    report[] = (suspect_pe.OPTIONAL_HEADER.DATA_DIRECTORY[].Size)

     report


 ():
    
    hashes = {}
     (filepath, )  f:
        data = f.read()
     algo  [, , ]:
        h = hashlib.new(algo)
        h.update(data)
        hashes[algo] = h.hexdigest()
     hashes


 __name__ == :
     (sys.argv) < :
        ()
        sys.exit()
    report = compare_pe_files(sys.argv[], sys.argv[])
    (json.dumps(report, indent=))