Pbot

Overview

Pbot (tracked under signatures Backdoor:Win32/Pbot, Trojan:Win32/Pbot, and Win32/Pbot) is a modular Windows remote access backdoor and network proxy agent. Infiltrating endpoints through drive-by exploit kits, malicious torrent downloads, and multi-stage trojan droppers, Pbot establishes a stealthy presence by injecting malicious threads into legitimate Windows system processes. It secures persistence by writing registry values under HKCU\Software\Microsoft\Windows\CurrentVersion\Run. Pbot connects to remote command-and-control servers using custom TCP or HTTP communication channels, transforming infected hosts into distributed proxy nodes for anonymizing malicious traffic. It supports dynamic module execution, allowing operators to run arbitrary remote commands, download secondary payloads, and capture sensitive network credentials.

Known aliases

Threat reports may refer to this family under multiple names:

• Backdoor:Win32/Pbot
• Trojan:Win32/Pbot
• Win32/Pbot
• Backdoor.Pbot
• Trojan.Pbot

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:

• T1059.003: Restrict execution of Windows Command Shell (cmd.exe) and block unauthorized batch scripts.
• T1071.001: Implement web filtering and SSL/TLS inspection to detect malicious command and control (C2) traffic hiding in HTTP/HTTPS.

MITRE D3FEND™ Defensive Countermeasures

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

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_PBOT_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Pbot"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "pbot" ascii wide nocase
        $s2 = "backdoor:win32/pbot" ascii wide nocase
        $s3 = "trojan:win32/pbot" ascii wide nocase
        $s4 = "win32/pbot" ascii wide nocase
        $s5 = "backdoor.pbot" ascii wide nocase
        $s6 = "trojan.pbot" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Pbot (Trojan) Execution & Triage
id: dccb241d-80b5-5cb0-a3eb-a01817345681
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Pbot 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/pbot
- 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.t1090
- attack.t1055
- attack.t1547_001
- attack.t1071_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_PBOT_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Pbot 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 = "pbot" 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. Isolate the host from the internal network and external internet immediately to terminate proxy relaying.
2. Kill unauthorized processes and audit memory space of injected Windows binaries.
3. Remove startup values under HKCU\Software\Microsoft\Windows\CurrentVersion\Run.
4. Block outbound C2 IP addresses and suspicious proxy ports at network firewalls.
5. Run an enterprise endpoint security scan to clean residual backdoor modules.

What to Avoid

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

1. Do not allow the infected host to route external traffic while under investigation.
2. Do not overlook network traffic anomalies originating from legitimate system process names.

References & External Analysis

• Microsoft Defender Threat Encyclopedia - Backdoor:Win32/Pbot
• Trend Micro Threat Encyclopedia - Backdoor.Win32.Pbot
• VirusTotal Threat Intelligence - Pbot Detection
• Search "pbot" on VirusTotal (External Analysis)
• Search "pbot" on Any.Run (Sandbox Sandbox)
• Search "pbot" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Trojan)

Explore other documented threats in the same operational category:

• Juicypotato
• Gamehuck
• Kuluoz
• Messengerpass
• Informer
• Pcreviver
• Cryptominer
• Schoolgirl

Machine-readable

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