Powerspritz

Overview

Executive Summary

Technical Architecture and Fileless Execution

• Initial Access: Often delivered via weaponized macro documents (e.g., Microsoft Word) or through the exploitation of remote execution vulnerabilities. The initial exploit executes a short, encoded PowerShell stub.
• In-Memory Payload Delivery: The PowerShell stub connects to a remote command-and-control (C2) server and downloads the primary PowerSpritz script. Crucially, this script is never written to disk; it is executed directly within the memory space of the `powershell.exe` process using the `Invoke-Expression` (IEX) cmdlet.
• Evasion and Persistence: PowerSpritz utilizes advanced AMSI (Anti-Malware Scan Interface) bypass techniques to blind local security defenses. It establishes fileless persistence by burying encoded PowerShell scripts within Windows Management Instrumentation (WMI) event subscriptions or complex Registry keys.

Threat Impact

Detection and Remediation Strategies

• PowerShell Logging: Standard antivirus is often ineffective against fileless attacks. Enable PowerShell Script Block Logging (Event ID 4104) across the enterprise. This forces Windows to decode and log the actual commands being executed, providing crucial visibility to the SOC.
• AMSI and EDR: Ensure that advanced EDR solutions are deployed and that AMSI is strictly enforced and monitored for bypass attempts.
• Execution Restrictions: Implement strict PowerShell execution policies. Restrict the execution of PowerShell scripts to signed, approved administrative scripts only, severely crippling the ability of PowerSpritz to launch.

Known aliases

Threat reports may refer to this family under multiple names:

• Trojan.PowerSpritz
• Fileless.PowerSpritz
• PowerShell.Downloader

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:

• T1059.001: Restrict execution of PowerShell. Enforce PowerShell Constrained Language Mode and Script Block Logging.

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_POWERSPRITZ_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Powerspritz"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "powerspritz" ascii wide nocase
        $s2 = "trojan.powerspritz" ascii wide nocase
        $s3 = "fileless.powerspritz" ascii wide nocase
        $s4 = "powershell.downloader" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Powerspritz (Ransomware) Execution & Triage
id: 06098fb0-40f6-56f3-b51a-0fa8f95eeb7c
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Powerspritz malware family. Detects volume shadow copy deletion, boot status
  tampering, and recovery inhibition characteristic of modern ransomware operations.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/powerspritz
- 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.ransomware
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1059_001
- attack.t1027_005
- attack.t1562_001
- attack.t1546_003
logsource:
  category: process_creation
  product: windows
detection:
  selection_process:
    Image|endswith:
    - \vssadmin.exe
    - \wmic.exe
    - \wbadmin.exe
    - \bcdedit.exe
    CommandLine|contains:
    - delete shadows
    - shadowcopy delete
    - resize shadowstorage
    - recoveryenabled no
    - ignoreallfailures
  condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: critical

rule MALWARE_WIN_POWERSPRITZ_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Powerspritz 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 = "powerspritz" 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. Immediately isolate affected host(s) from the internal network (disconnect physical Ethernet and disable Wi-Fi/Bluetooth) to prevent Powerspritz from spreading laterally or encrypting network-attached storage (NAS) and shared SMB volumes.
2. Preserve volatile system memory (RAM capture) on a representative endpoint before attempting a reboot or power-down, as Powerspritz symmetric encryption keys or uncompiled payload components may still reside in memory.
3. Audit process execution logs and terminate active scripting interpreters (e.g. PowerShell, CMD, WScript) or commands executing 'vssadmin.exe delete shadows' or 'wbadmin' used by Powerspritz to inhibit recovery.
4. Investigate the initial compromise vector (such as exposed RDP instances, spearphishing attachments, or vulnerable edge gateways) and enforce an immediate credential reset for all compromised Active Directory accounts.
5. Restore critical assets and databases exclusively from verified, air-gapped, or immutable offline backups once the Powerspritz binary and related persistence hooks are eradicated.

What to Avoid

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

1. Do not restart or power cycle infected systems prematurely; doing so destroys volatile RAM encryption keys and may trigger bootloader locking logic embedded in Powerspritz.
2. Avoid negotiating or paying the extortion demand without prior forensic evaluation and consultation with incident response specialists, as payment does not guarantee data recovery.
3. Do not connect clean backup drives or external storage to the affected network until Powerspritz eradication is completely verified.

References & External Analysis

• Search "powerspritz" on VirusTotal (External Analysis)
• Search "powerspritz" on Any.Run (Sandbox Sandbox)
• Search "powerspritz" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Ransomware)

Explore other documented threats in the same operational category:

• Goabeny
• Sigma
• Shark
• Blackv
• Genericrxft
• Genericrxcu
• Ryuk
• Xorist

Machine-readable

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