Zbot

Overview

Zbot (universally known as Zeus, and documented under variants such as Zeus Panda, GameOver Zeus, and Wsnpoem) is arguably the most influential banking trojan and crimeware toolkit in cybersecurity history. Originally authored in 2006 by Russian threat actor 'Slavik' (Evgeniy Mikhailovich Bogachev, operative head of the 'Business Club' syndicate), Zeus established the architectural paradigm for modern credential theft, automated banking diversion, and decentralized botnet operations. The malware executes via stealthy injection into critical Windows processes (winlogon.exe, svchost.exe, explorer.exe) and hooks low-level WinINet and NSS socket libraries. Through this Man-in-the-Browser (MitB, T1185) mechanism, Zeus captures plaintext banking credentials, account numbers, and personal identifiers before transmission and browser-side TLS/SSL encryption. Zeus pioneered dynamic HTML web-injections and Automated Transfer Systems (ATS), which secretly modify account balances in the victim's browser while surreptitiously redirecting wire funds to money-mule bank accounts in real time. In 2011, the complete Zeus source code was leaked online, sparking a massive proliferation of derivative banking malware, including Citadel, Ramnit, SpyEye, KINS, and Panda Banker. Following the leak, Bogachev developed 'GameOver Zeus' (GOZ), replacing the centralized HTTP C2 architecture with an advanced, resilient peer-to-peer (P2P) network with cryptographic domain generation algorithms (DGAs). GameOver Zeus infected over one million endpoints worldwide and served as the primary distribution channel for CryptoLocker, the first major global crypto-ransomware epidemic. In June 2014, an international law enforcement coalition dismantled the GOZ infrastructure under Operation Tovar, leading to CISA Alert AA14-150A and the FBI placing Bogachev on its Cyber Most Wanted list.

Known aliases

Threat reports may refer to this family under multiple names:

• Zeus
• Zbot
• GameOver Zeus
• Zeus Panda
• Wsnpoem
• Trojan-Spy.Win32.Zbot
• Win32/Zbot
• Trojan:Win32/Zbot

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: Prt

Known Derivatives & Downstream Variants: Gameover_Zeus · Zeus_Panda · Citadel · Ramnit · Spyeye · Kins · Floki_Bot

MITRE ATT&CK Techniques

This family has been observed using the following ATT&CK techniques: T1185 · T1056.001 · T1055.001 · T1071.001 · T1547.001 · T1003.001 · T1090.001 · T1568.002

Tactical Mitigations

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

• T1003.001: Monitor for LSASS memory dumping or registry SAM extraction. Enable Credential Guard on Windows systems.
• T1056.001: Implement Endpoint Detection and Response (EDR) to monitor for suspicious API calls related to keystroke interception. Enforce Multi-Factor Authentication (MFA) to render stolen passwords useless.
• T1071.001: Implement web filtering and SSL/TLS inspection to detect malicious command and control (C2) traffic hiding in HTTP/HTTPS.
• T1185: Enforce strong MFA and use browser isolation or hardened browsers for sensitive financial or administrative portals to defeat session hijacking.

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-2010-0805 — In-depth exploitation analysis and catalog intelligence (NIST NVD ↗).
• CVE-2013-3893 — 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.

• d6c3821034f5d2b7812f86d6342898ad9de7e3b12365a6f272a27546857ea568
• f66d4825925a1769123868ef6093fb18227096d29d4948a2872323a7bb146312
• 0c7493a77a9be3b33346ff1758c0c97793d544078aa868f76dcf42f02e5bfe75

Delivery vectors

• Drive-by downloads from compromised websites via browser exploit kits (Blackhole, Phoenix, Nuclear)
• Malspam phishing emails with weaponized PDF and Word attachments exploiting CVE-2010-0805 and CVE-2013-3893
• Upatre downloader and peer-to-peer distribution networks

Persistence mechanisms

• Registry Run key under HKLM\Software\Microsoft\Windows\CurrentVersion\Run
• Userinit registry key modification: HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit
• Process injection into winlogon.exe, svchost.exe, and explorer.exe hooking WinINet.dll and nss3.dll

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_ZBOT_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Zbot"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "zbot" ascii wide nocase
        $s2 = "zeus" ascii wide nocase
        $s3 = "zbot" ascii wide nocase
        $s4 = "gameover zeus" ascii wide nocase
        $s5 = "zeus panda" ascii wide nocase
        $s6 = "wsnpoem" ascii wide nocase
        $s7 = "trojan-spy.win32.zbot" ascii wide nocase
        $s8 = "win32/zbot" ascii wide nocase
        $s9 = "trojan:win32/zbot" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Zbot (Banking Trojan) Execution & Triage
id: 94568e78-bda3-50b4-a114-f62b10cf49b8
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Zbot malware family. Detects recon staging, certutil file payload staging,
  and web-inject process proxying characteristic of banking trojan initial loaders.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/zbot
- https://malware-families-catalog.systemhelpdesk.com/defensive/banking-trojan-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.banking-trojan
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1185
- attack.t1056_001
- attack.t1055_001
- attack.t1071_001
- attack.t1547_001
logsource:
  category: process_creation
  product: windows
detection:
  selection_process:
    Image|endswith:
    - \svchost.exe
    - \explorer.exe
    - \msiexec.exe
    - \certutil.exe
    CommandLine|contains:
    - -urlcache
    - -split -f
    - ipconfig /all
    - route print
    - netstat -ano
  condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: high

rule MALWARE_WIN_ZBOT_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Zbot 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 = "zbot" 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
}

References & External Analysis

• CISA Alert AA14-150A: GameOver Zeus and CryptoLocker
• Federal Bureau of Investigation: Cyber Most Wanted Evgeniy Bogachev
• Krebs on Security: The Story of Zeus and GameOver Zeus
• BAE Systems Applied Intelligence: Zeus Malware Family Analysis
• CISA Advisory: AA14-150A
• Search "zbot" on VirusTotal (External Analysis)
• Search "zbot" on Any.Run (Sandbox Sandbox)
• Search "zbot" on MalwareBazaar (Malware Samples)

North American Authority Advisory (CISA / NIST)

The Cybersecurity and Infrastructure Security Agency (CISA) has published an official US federal advisory on this family, which can be mapped to NIST Cybersecurity Framework (CSF) incident response controls: AA14-150A ↗

Frequently Asked Questions

Related Threats (Category: Banking Trojan)

Explore other documented threats in the same operational category:

• Shiz
• Guildma
• Tinynuke
• Zusy
• Clipbanker
• Banbra
• Blackmoon
• Alien

Machine-readable

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