{
  "family": "pwszbot",
  "sample_count": 4,
  "category": "trojan",
  "description": "Trojan:Win32/Pwszbot (a blend of Password Stealer and Zbot/Zeus functionalities) is a highly sophisticated, modular banking trojan and information stealer. It is designed to act as a persistent botnet agent, silently harvesting a massive variety of sensitive data, intercepting web sessions, and granting remote attackers persistent access to the compromised machine. It shares significant code similarities and operational tactics with the infamous Zeus banking trojan.<br><br><b>Understanding Pwszbot (Banking Trojans)</b><br>To an end-user, a Pwszbot infection is completely invisible; they can use their computer and browse the internet normally. For a financial institution, it represents a critical threat capable of defeating standard anti-fraud measures. Because it acts as a 'Man-in-the-Browser', it can alter what the user sees on their screen during a banking session, intercepting two-factor authentication codes and manipulating transactions in real-time.<br><br><b>Execution and Credential Harvesting Mechanics</b><br>Pwszbot is typically distributed via sophisticated spear-phishing campaigns (often using macros or exploit documents) (`T1566.001`). Upon execution, it drops a highly obfuscated payload into a random `AppData` subdirectory (`T1027`). It establishes persistence by modifying Registry Run keys or creating hidden scheduled tasks (`T1547.001`). The core functionality involves deep process injection (`T1055`), specifically targeting web browsers (`iexplore.exe`, `chrome.exe`, `firefox.exe`). Once injected, it performs 'Web Injects' (`T1185`): when the user visits a targeted banking URL (retrieved from a configuration file downloaded from the C2 server), the trojan dynamically modifies the HTML/JavaScript of the page, presenting fake login forms or transaction authorization prompts directly to the user.<br><br><b>Indicators of Compromise & Impact</b><br>The impact is catastrophic financial fraud and total credential compromise. Host-based IoCs include EDR alerts for 'Suspicious Process Hollowing' or 'API Hooking' targeting major web browsers. Network IoCs include encrypted beaconing traffic to known botnet C2 panels, and the downloading of encrypted configuration files (`.bin` or `.cfg` files containing the targeted bank URLs).",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Pwszbot and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Pwszbot is classified as a Trojan. Documented across security telemetry, it is engineered to execute unauthorized operations, establish persistent footholds on target endpoints, and facilitate malicious campaigns targeting enterprise and individual environments."
      }
    },
    {
      "@type": "Question",
      "name": "How does Pwszbot establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Pwszbot typically establishes persistence through registry run keys, scheduled tasks, or service installations, while evading signature-based antivirus solutions through code obfuscation, memory injection, or anti-analysis sandbox checks."
      }
    },
    {
      "@type": "Question",
      "name": "What are the essential incident response steps for mitigating a Pwszbot compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Pwszbot should immediately isolate affected endpoints from the network, perform memory triage to capture volatile forensic artifacts, audit registry and startup persistence mechanisms, revoke exposed user credentials, and restore systems from verified, clean backups."
      }
    },
    {
      "@type": "Question",
      "name": "What secondary payloads and staging behaviors are commonly associated with Pwszbot?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Pwszbot frequently operates as a loader or dropper designed to establish a foothold before downloading and executing secondary high-impact malware payloads. Depending on the threat actor's objectives, these dropped modules can range from ransomware and banking injects to modular infostealers and remote management backdoors."
      }
    },
    {
      "@type": "Question",
      "name": "How can security operations teams effectively detect and hunt for Pwszbot across enterprise endpoints?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Defenders should hunt for Pwszbot by deploying behavioral endpoint detection and response (EDR) rules that monitor suspicious process spawning (such as cmd.exe or powershell.exe spawned from office documents or temporary directories), anomalous outbound network connections from non-browser binaries, and unauthorized modifications to Windows Run keys and scheduled task registries."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1055",
    "T1547.001",
    "T1185",
    "T1555.003"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1185",
      "name": "Browser Session Hijacking (Man-in-the-Browser / Web Injects)",
      "tactic": "Collection"
    },
    {
      "id": "T1055",
      "name": "Process Injection (Injecting into browser processes)",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1555.003",
      "name": "Credentials from Password Stores: Credentials from Web Browsers",
      "tactic": "Credential Access"
    },
    {
      "id": "T1547.001",
      "name": "Boot or Logon Autostart Execution",
      "tactic": "Persistence"
    }
  ],
  "containment_steps": [
    "Immediately isolate the endpoint from the network to sever the C2 connection and prevent the attacker from initiating fraudulent transactions or deploying further modules.",
    "Contact the victim's financial institutions immediately to freeze accounts and alert them to the high probability of a Man-in-the-Browser compromise.",
    "Assume all web credentials stored on or entered into the machine have been stolen, and mandate enterprise-wide password resets.",
    "Capture a live memory image (RAM dump) to extract the decrypted Pwszbot configuration file, which will reveal exactly which banks and URLs the malware was targeting."
  ],
  "what_to_avoid": [
    "Do not rely on standard MFA (like SMS codes) to protect accounts if a banking trojan is suspected, as the attacker is actively intercepting those codes.",
    "Avoid simply running an AV scan and leaving the machine online; banking trojans require a complete wipe and reimage to ensure the deep API hooks are removed."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "execution",
    "persistence"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows 7"
  ]
}