detecting-t1055-process-injection-with-sysmon

name	detecting-t1055-process-injection-with-sysmon
description	Detect process injection techniques (T1055) including classic DLL injection, process hollowing, and APC injection by analyzing Sysmon events for cross-process memory operations, remote thread creation, and anomalous DLL loading patterns. Use when detecting process injection techniques (t1055) including classic dll injection, process.
domain	cybersecurity
tags	["threat-hunting","process-injection","sysmon","mitre-t1055","defense-evasion","dll-injection","process-hollowing"]
subdomain	threat-hunting
version	1.0
author	oyi77
license	Apache-2.0
d3fend_techniques	["Executable Denylisting","Execution Isolation","File Metadata Consistency Validation","Content Format Conversion","File Content Analysis"]
nist_csf	["DE.CM-01","DE.AE-02","DE.AE-07","ID.RA-05"]

Detecting T1055 Process Injection With Sysmon

Overview

Cybersecurity skill for detecting t1055 process injection with sysmon. Follows industry best practices and security standards.

When to Use

Trigger phrases:

• "detecting t1055 process injection with sysmon"

• "Detect process injection techniques (T1055) including classic DLL injection, pro"

• When hunting for defense evasion techniques that hide malicious code inside legitimate processes

• After EDR alerts for suspicious cross-process memory access or remote thread creation

• When investigating malware that injects into svchost.exe, explorer.exe, or other system processes

• During purple team exercises testing detection of process injection variants

• When validating Sysmon configuration coverage for injection detection

When NOT to Use

• When you lack proper authorization for testing
• For production systems without change management
• When the task requires legal or compliance expertise beyond technical scope

Prerequisites

• Sysmon deployed with comprehensive configuration capturing Events 1, 7, 8, 10, 25
• Event ID 8 (CreateRemoteThread) enabled for remote thread detection
• Event ID 10 (ProcessAccess) configured with appropriate access mask filters
• Event ID 7 (ImageLoaded) for DLL injection detection
• Event ID 25 (ProcessTampering) for process hollowing on Sysmon 13+
• SIEM platform for correlation and alerting

Workflow

# Example: IOC detection
import re

IOC_PATTERNS = {
    "ip": r"\b(?:\d{1,3}\.){3}\d{1,3}\b",
    "domain": r"\b[a-z0-9-]+\.[a-z]{2,}\b",
    "hash_md5": r"\b[a-f0-9]{32}\b",
    "hash_sha256": r"\b[a-f0-9]{64}\b",
}

def extract_iocs(text: str) -> dict:
    return {k: re.findall(v, text)  k, v  IOC_PATTERNS.items()}