High

Overview

Executive Summary

Behavioral Context and Detection Mechanisms

• Ransomware Indicators: Rapid, mass encryption of files in user directories, or attempts to delete Volume Shadow Copies (`vssadmin.exe delete shadows`).
• Privilege Escalation: Unauthorized attempts to exploit known local vulnerabilities (e.g., exploiting outdated drivers) to gain `SYSTEM` level access.
• Defense Evasion: Actively attempting to terminate security processes, disable Windows Defender, or unhook user-mode APIs used by EDR solutions.

Risk Assessment and Incident Triage

Response and Eradication Strategy

• Immediate Containment: The endpoint triggering the "High" alert must be instantly severed from the corporate network, either physically or via network isolation features within the EDR platform, to halt lateral movement.
• Forensic Capture: Capture a memory dump and disk image of the isolated endpoint for forensic analysis to determine the scope of the breach and identify the specific threat actor or malware family involved.
• Threat Hunting: Utilize the behavioral indicators that triggered the alert (e.g., specific command-line arguments, dropped file paths) to conduct a proactive threat hunt across the entire enterprise environment.

Known aliases

Threat reports may refer to this family under multiple names:

• HighRisk
• Risk.High
• Generic.High

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:

• 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):

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_HIGH_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for High"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "high" ascii wide nocase
        $s2 = "highrisk" ascii wide nocase
        $s3 = "risk.high" ascii wide nocase
        $s4 = "generic.high" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - High (Generic Detection) Execution & Triage
id: 48af9171-4b5c-53f7-baf4-bf022326374b
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the High 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/high
- 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.generic-detection
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1204
- attack.t1055
- attack.t1547_001
- attack.t1105
- attack.t1082
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_HIGH_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for High 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 = "high" 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. Sever network connectivity for the flagged endpoint to terminate persistent command-and-control (C2) communication channels and stop High from retrieving secondary stage payloads.
2. Capture process memory triage to detect and terminate malicious threads injected by High into legitimate system processes such as explorer.exe or svchost.exe.
3. Audit Windows Registry Run keys (HKCU\Software\Microsoft\Windows\CurrentVersion\Run) and Task Scheduler entries to locate and purge High persistence hooks.
4. Deploy updated enterprise EDR detection signatures and conduct an out-of-band endpoint scan to isolate dropped binaries and staged payloads.
5. Rotate all credentials, domain user passwords, and session cookies active on the system during the High execution timeframe.

What to Avoid

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

1. Do not assume the incident is resolved simply because an antivirus tool removed the initial High dropper; always verify that secondary payloads and persistence hooks have been eradicated.
2. Avoid logging in with Domain Admin or privileged credentials on a machine suspected of running High until memory triage is complete.
3. Do not delay host isolation; automated lateral movement and credential dumping can occur within minutes of initial execution.

References & External Analysis

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

Frequently Asked Questions

Related Threats (Category: Generic Detection)

Explore other documented threats in the same operational category:

• Moderate

Machine-readable

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