Reptile
Table of Contents
Overview
Reptile (widely tracked across threat intelligence feeds as Rootkit.Reptile and Backdoor.Reptile) is a powerful, open-source stealth kernel-mode rootkit and backdoor framework created by researcher f0rb1dd3n and widely weaponized by sophisticated state-sponsored and cybercrime threat actors. Designed to provide deep persistence and concealment, Reptile operates as a Loadable Kernel Module (LKM) or Windows kernel driver that hooks system call tables, IRP handlers, and process management routines. It completely hides selected processes, network connections, ports, and files from operating system utilities, while providing an encrypted ICMP/UDP port-knocking reverse shell backdoor that activates on demand.
Known aliases
Threat reports may refer to this family under multiple names:
MITRE ATT&CK Techniques
Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:
| Technique | Name | Tactic | Official Spec |
|---|---|---|---|
T1547.006 | Boot or Logon Autostart Execution: Kernel Modules and Extensions (LKM) | Persistence | ATT&CK ↗ |
T1014 | Rootkit (Kernel Hooking) | Defense Evasion | ATT&CK ↗ |
T1205.001 | Traffic Signaling: Port Knocking (Hidden Backdoor) | Defense Evasion | ATT&CK ↗ |
T1068 | Exploitation for Privilege Escalation (Required for LKM insertion) | Privilege Escalation | ATT&CK ↗ |
T1562.001 | Impair Defenses: Disable or Modify Tools (Hiding from EDR) | Defense Evasion | ATT&CK ↗ |
MITRE D3FEND™ Defensive Countermeasures
Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):
| D3FEND ID | Countermeasure Name | Tactic | Countered ATT&CK | Defensive Guidance |
|---|---|---|---|---|
D3-KMC | Kernel Memory Integrity Checking | Harden | T1014 | Enable Hypervisor-Protected Code Integrity (HVCI) and UEFI Secure Boot to prevent unsigned kernel driver execution. |
D3-KPA | Kernel Patching & Privilege Auditing | Harden | T1068 | Enforce rapid OS kernel patch cycles and deploy Exploit Guard protections to block memory corruption and elevation exploits. |
D3-RPM | Registry Persistence Monitoring | Detect | T1547.006 | Monitor changes to standard autostart run keys (HKLM\Software\Microsoft\Windows\CurrentVersion\Run) and Startup folders. |
D3-STA | Security Tool Anti-Tamper Enforcement | Harden | T1562.001 | Block unauthorized modification of antivirus registry flags and prevent stopping security agent services. |
Tiered Detection Rules (Cisco CAIRN Model)
Modern threat detection requires multi-layered rule engineering. We classify detections into three operational tiers based on signal fidelity:
Tier 1 Primitive Artifact Rule (Fast Triage)
Matches raw strings and file markers. Vulnerable to binary repacking and simple obfuscation.
rule MALWARE_WIN_REPTILE_T1_ARTIFACT {
meta:
description = "Tier 1 Primitive Artifact: Raw string matches for Reptile"
tier = "T1 - Primitive Artifact"
confidence = "Low-Medium (Fast Triage)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
$s1 = "reptile" ascii wide nocase
$s2 = "rootkit:linux/reptile" ascii wide nocase
$s3 = "backdoor:linux/reptile" ascii wide nocase
$s4 = "rootkit:win32/reptile" ascii wide nocase
$s5 = "reptile lkm rootkit" ascii wide nocase
$s6 = "reptile framework" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Tier 2 Behavioral Context Rule (Process Chains & Sigma)
Tracks parent-child process anomalies and suspicious scripting telemetry. Resilient against file renames.
title: SystemHelpDesk Detection - Reptile (Rootkit) Execution & Triage
id: 8809a2b8-7830-5a48-b819-fbe7621b5aaf
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
with the Reptile malware family. Detects suspicious execution from temporary user
directories with hidden window flags and background transfer utilities.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/reptile
- https://malware-families-catalog.systemhelpdesk.com/defensive/ransomware-protection
- https://malware-families-catalog.systemhelpdesk.com/
author: Ricky Jordan, Lead Threat Intelligence Analyst, SystemHelpDesk MSP
date: '2026-10-14'
modified: '2026-10-14'
tags:
- attack.rootkit
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1014
- attack.t1543_003
- attack.t1205_001
- attack.t1562_001
- attack.t1059_004
logsource:
category: process_creation
product: windows
detection:
selection_process:
Image|endswith:
- \cmd.exe
- \powershell.exe
- \cscript.exe
- \wscript.exe
CommandLine|contains:
- AppData\Local\Temp
- -WindowStyle Hidden
- /e:jscript
- bitsadmin /transfer
condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: mediumTier 3 Attribution Fingerprint Rule (High Fidelity)
Deep signature matching distinctive operational fingerprints and payload characteristics.
rule MALWARE_WIN_REPTILE_T3_ATTRIBUTION {
meta:
description = "Tier 3 Attribution Fingerprint: Heuristic detection for Reptile tradecraft"
tier = "T3 - Attribution Fingerprint"
confidence = "High (Confirmed Family Signature)"
author = "SystemHelpdesk Threat Research Desk"
date = "2026-10-14"
strings:
// Core family identifier & heuristic payload signatures
$attrib_str = "reptile" ascii wide nocase
$pe_magic = "MZ" ascii
$net_marker = "http" ascii nocase
condition:
uint16(0) == 0x5a4d and ($attrib_str and $net_marker) and filesize < 15MB
}Containment & Response Steps
Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.
- Instantly isolate the compromised server from the network, but do NOT power it down if you intend to perform forensics, as the rootkit resides in volatile kernel memory.
- Assume the server is fundamentally compromised. You cannot trust any output from commands run on the live, infected system.
- Capture a full memory image (RAM dump) of the Linux server for kernel forensics to identify the hooked functions and extract the attacker's configuration.
- The only secure remediation for a Kernel Rootkit infection is a complete wipe and bare-metal reinstall of the operating system. Do not attempt to 'clean' it.
What to Avoid
Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.
- Do not trust the output of `lsmod` (list modules); Reptile is designed to instantly unlink itself from the module list to hide its presence.
- Avoid relying on standard file integrity monitoring (FIM) tools running on the infected OS, as the rootkit will intercept their reads and return clean data.
References & External Analysis
Frequently Asked Questions
What is Rootkit:Linux/Reptile (Reptile Framework)?
Reptile is an advanced kernel-mode rootkit and backdoor framework used to conceal processes, network sockets, and backdoor access.
How does Reptile achieve stealth at the kernel level?
It hooks system call dispatch tables and unlinks data structures to hide files, directories, processes, and network ports from monitoring tools.
How does the port-knocking backdoor in Reptile function?
The kernel driver silently inspects raw network packets, spawning an encrypted reverse root shell only when receiving a secret magic packet.
Why is Reptile widely abused by threat actors?
Because it is an open-source, highly modular, and extremely reliable kernel rootkit framework that bypasses traditional security agents.
How can security defenders detect an active Reptile rootkit?
Use kernel integrity monitoring tools, perform memory forensics using Volatility, audit loaded kernel modules, and monitor raw network traffic.
How do I remove the Reptile Rootkit from Windows?
Manual removal of Reptile is highly discouraged as it may leave persistence mechanisms intact. We recommend disconnecting the device from the internet and utilizing a professional incident response service or enterprise-grade EDR software to conduct a full forensic sweep.
Is Reptile a virus or a Rootkit?
Reptile is classified as a Rootkit. Unlike traditional viruses that infect files, modern malware like Reptile typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Reptile infection?
Symptoms of Reptile can include unexpected system slowness, unauthorized outbound network traffic to unknown IP addresses, disabled security software, and suspicious background processes running from AppData or Temp directories.
Protect Your Network Against Rootkits
Want to prevent Reptile and similar threats from compromising your organization? Read our comprehensive defensive guide: Rootkit & Bootkit Protection.
📣 Threat Intel Correction or Update?
Notice an outdated IOC, unlisted alias, or disputed attribution? Threat researchers are invited to propose an update on GitHub or contact the SystemHelpDesk research desk. All community revisions are credited in our public CHANGELOG.
Machine-readable
Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/reptile.json
Ecosystem & Interactive Environments
This profile is part of the Malware Families Catalog, a public dataset of 2,899 malware families. The catalog is also published across our ecosystem: Hugging Face, Kaggle, Zenodo, Replit, StackBlitz, CodeSandbox, and CodePen.