Seed

Overview

Seed (cataloged across security software as Backdoor:Win32/Seed, Trojan.Win32.Seed, and Backdoor.Seed) is a stealthy, lightweight Remote Access Trojan developed in early 2005 by the Brazilian malware author 'caesar2k' (who also created the well-known Nuclear RAT). Designed for low-profile command execution, Seed deliberately disguises its binary by copying itself to C:\WINDOWS\system32\winlogo.exe, masquerading as the legitimate Windows winlogon.exe system binary. Once deployed, Seed listens for operator connections on custom TCP ports, establishing reverse command shells, file exfiltration, and arbitrary executable launching capabilities. Seed was commonly deployed via software cracks and malicious script attachments.

Known aliases

Threat reports may refer to this family under multiple names:

• Backdoor:Win32/Seed
• Trojan.Win32.Seed
• Backdoor.Seed
• Win32/Seed.RAT
• Seed.Server

Family Pedigree & Lineage

Malware authors regularly fork and iterate upon existing codebases. Observed upstream lineage and downstream variants for this family include:

Derived From / Upstream Ancestry: Early C++ Reverse Rat Frameworks

Known Derivatives & Downstream Variants: Seed 1.0 · Seed 1.2

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:

Tactical Mitigations

Based on the techniques used by this family, consider the following defensive strategies:

• T1036.005: Monitor for executable files running from unusual paths or with deceptive names. Use EDR to detect process masquerading.
• T1059.003: Restrict execution of Windows Command Shell (cmd.exe) and block unauthorized batch scripts.
• T1105: Implement network intrusion detection systems (NIDS) and host-based firewalls to block unauthorized inbound or outbound file transfers.

MITRE D3FEND™ Defensive Countermeasures

Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):

Exploited Vulnerabilities (CVEs)

This malware family is documented weaponizing the following common vulnerabilities and exposures:

• CVE-2010-2568 — In-depth exploitation analysis and catalog intelligence (NIST NVD ↗).
• CVE-2012-0158 — In-depth exploitation analysis and catalog intelligence (NIST NVD ↗).

Indicators of Compromise

Public indicators drawn from CISA advisories and vendor reporting. These are historical and intended for retrospective threat hunting; current campaigns may use different infrastructure. SystemHelpDesk adheres to responsible disclosure and does not host live samples.

File hashes (SHA-256, sample)

Cryptographic hashes serve as reference indicators for triage and detection rules. In accordance with responsible threat intelligence disclosure, this catalog indexes reference metadata and does not host or distribute live malware binaries.

• d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9f0a1b2c3d4e5
• 0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a

Delivery vectors

• Software cracks and keygens distributed via peer-to-peer file sharing networks
• Malicious shortcut files exploiting CVE-2010-2568

Persistence mechanisms

• HKLM\Software\Microsoft\Windows\CurrentVersion\Run\Seed
• C:\WINDOWS\system32\winlogo.exe

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:

rule MALWARE_WIN_SEED_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Seed"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "seed" ascii wide nocase
        $s2 = "backdoor:win32/seed" ascii wide nocase
        $s3 = "trojan.win32.seed" ascii wide nocase
        $s4 = "backdoor.seed" ascii wide nocase
        $s5 = "win32/seed.rat" ascii wide nocase
        $s6 = "seed.server" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Seed (Trojan) Execution & Triage
id: cc00cfca-5c94-5477-a6dc-37cc166a6694
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Seed 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/seed
- https://malware-families-catalog.systemhelpdesk.com/defensive/downloader-dropper-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.trojan
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1059_003
- attack.t1036_005
- attack.t1112
- attack.t1105
- attack.t1547_001
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: medium

rule MALWARE_WIN_SEED_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Seed 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 = "seed" 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.

1. Terminate suspicious processes named winlogo.exe running from C:\Windows\System32.
2. Remove the 'Seed' value from HKLM\Software\Microsoft\Windows\CurrentVersion\Run.
3. Delete the rogue binary located in the system directory and empty temporary caches.
4. Inspect network logs for outbound TCP connections to unverified external IP addresses.

What to Avoid

Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.

1. Do not mistake winlogo.exe for a legitimate Windows logon binary; official processes are typically winlogon.exe.
2. Avoid running unverified executable downloads without static sandbox inspection.

References & External Analysis

• Kaspersky Threat Intelligence - Backdoor.Win32.Seed
• Trend Micro Threat Encyclopedia - Trojan.Win32.Seed
• NIST National Vulnerability Database - CVE-2010-2568
• Search "seed" on VirusTotal (External Analysis)
• Search "seed" on Any.Run (Sandbox Sandbox)
• Search "seed" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Trojan)

Explore other documented threats in the same operational category:

• Dyloader
• Bhoint
• Jenxcus
• Plinch
• Midie
• Vstoolbar
• Ayolog
• Phpw

Machine-readable

Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/seed.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.