Potential PowerShell HackTool Script by Author

[metadata]
creation_date = "2024/05/08"
integration = ["windows"]
maturity = "production"
updated_date = "2026/05/01"

[rule]
author = ["Elastic"]
description = """
Identifies PowerShell script block content containing known offensive-tool author handles or attribution strings (for
example, public tool author names). Attackers often run public PowerShell tooling with minimal changes, leaving author
artifacts in comments or headers.
"""
from = "now-9m"
index = ["logs-windows.powershell*", "winlogbeat-*"]
language = "kuery"
license = "Elastic License v2"
name = "Potential PowerShell HackTool Script by Author"
references = [
    "https://github.com/atc-project/atc-data/blob/master/docs/Logging_Policies/LP_0109_windows_powershell_script_block_log.md",
]
risk_score = 73
rule_id = "2553a9af-52a4-4a05-bb03-85b2a479a0a0"
severity = "high"
tags = [
    "Domain: Endpoint",
    "OS: Windows",
    "Use Case: Threat Detection",
    "Tactic: Execution",
    "Data Source: PowerShell Logs",
    "Resources: Investigation Guide",
]
timestamp_override = "event.ingested"
type = "query"

query = '''
host.os.type:windows and event.category:process and
  powershell.file.script_block_text : (
      "mattifestation" or "JosephBialek" or
      "harmj0y" or "ukstufus" or
      "SecureThisShit" or "Matthew Graeber" or
      "secabstraction" or "mgeeky" or
      "oddvarmoe" or "am0nsec" or
      "obscuresec" or "sixdub" or
      "darkoperator" or "funoverip" or
      "rvrsh3ll" or "kevin_robertson" or
      "dafthack" or "r4wd3r" or
      "danielhbohannon" or "OneLogicalMyth" or
      "cobbr_io" or "xorrior" or
      "PetrMedonos" or "citronneur" or
      "eladshamir" or "RastaMouse" or
      "enigma0x3" or "FuzzySec" or
      "424f424f" or "jaredhaight" or
      "fullmetalcache" or "Hubbl3" or
      "curi0usJack" or "Cx01N" or
      "itm4n" or "nurfed1" or
      "cfalta" or "Scott Sutherland" or
      "_nullbind" or "_tmenochet" or
      "jaredcatkinson" or "ChrisTruncer" or
      "monoxgas" or "TheRealWover" or
      "splinter_code" or "samratashok" or
      "leechristensen" or "nikhil_mitt"
  ) and
  not powershell.file.script_block_text : ("Get-UEFIDatabaseSigner" or "Posh-SSH")
'''

note = """## Triage and analysis

### Investigating Potential PowerShell HackTool Script by Author

#### Possible investigation steps

- What did the alert-local author match show?
  - Focus: `powershell.file.script_block_text`, `powershell.file.script_block_length`, `file.path`, and `user.id` on `host.id`.
  - Implication: escalate when the handle appears beside executable functions, encoded strings, download, credential, discovery, remote-execution, or persistence logic; lower suspicion when it is only an inert header or comment in a recognized lab, test, or community-module path with harmless surrounding code.

- Can you reconstruct the complete script block before judging intent?
  - Focus: collect and order fragments on `host.id` with `powershell.file.script_block_id`, `powershell.sequence`, `powershell.total`, and `powershell.file.script_block_text`. $investigate_0
  - Implication: escalate when reconstruction reveals hidden stages, helper functions, obfuscation, decoding, or payload logic; keep unresolved if fragments are missing because they can hide decisive code.

- Was the script file-backed or fileless, and what does that say about delivery?
  - Focus: `file.path`, `file.directory`, and `file.name` when present; absent `file.path` suggests inline, generated, or interactive execution.
  - Implication: escalate when fileless execution, user-writable paths, shares, temp or staging folders, or suspicious names pair with hacktool code; lower suspicion when a stable repository, lab path, or community-module path matches benign content.

- Can you recover the PowerShell process and explain launch?
  - Focus: With endpoint process telemetry, recover the matching process via `host.id + process.pid` before interpreting `process.*` or `process.parent.*`. Capture `process.entity_id`, `process.command_line`, `process.parent.executable`, and `process.parent.command_line`. $investigate_1
  - Hint: confirm timestamps to reduce PID-reuse ambiguity; if no process start event appears, expand time before falling back to `host.id`, `user.id`, and alert time.
  - Implication: escalate when a document, browser, chat client, remote-management tool, scheduled task, service, or unexpected script host launched the code without matching lab, assessment, support, or deployment evidence; lower suspicion when lineage matches the exact workflow proven by script content.

- What capability or observables move this beyond attribution text?
  - Focus: reconstructed script for credential access, discovery, remote execution, payload delivery, persistence, AMSI or logging tampering, reflection, or decode-and-execute logic; extract domains, IPs, URLs, paths, accounts, registry targets, and reusable function or module names.
  - Implication: escalate when the body implements offensive capability or yields high-signal observables; lower suspicion only when it remains benign utility logic tied to a recognized workflow.

- Did script-extracted file or registry targets appear on the host?
  - Focus: With file or registry telemetry, search same-PID events around `@timestamp` for extracted `file.path`, `registry.path`, `registry.value`, or `registry.data.strings`. $investigate_4
  - Implication: escalate when extracted payload paths are created or executed, or registry targets indicate persistence or security changes; missing artifact or configuration telemetry is unresolved, not benign.

- Did extracted network or identity observables confirm active offensive use?
  - Focus: With network telemetry, search same-PID DNS and connection events for extracted domains in `dns.question.name` or `dns.resolved_ip` and IPs in `destination.ip`. $investigate_5 Review Windows 4624 or 4648 with `winlog.event_data.TargetUserName` and `winlog.event_data.SubjectUserName` for extracted accounts.
  - Implication: escalate when the host contacts extracted infrastructure, downloads content, or shows remote, credential, or lateral-use evidence. Missing network or authentication telemetry is unresolved, not benign.

- If the script content or launch chain remains suspicious or unresolved, does recurrence change scope?
  - Focus: related alerts for `user.id` in the last 48 hours, comparing author string, reconstructed script body, file source, launch pattern, and extracted observables. $investigate_2
  - Hint: if the user view is quiet or ambiguous, compare related alerts for `host.id` in the last 48 hours. $investigate_3
  - Implication: broaden when the same script body or extracted observables reach unrelated users or hosts; keep local when recurrence stays within the same lab, assessment, support, or deployment host/user cohort. Do not close on recurrence alone if script content or recovery remains unresolved.

- Escalate on reconstructed capability, unauthorized launch, follow-on evidence, or missing/conflicting required telemetry; close only when the author match, reconstructed script, source path, launch context, observables, and `user.id` or `host.id` scope bind one exact benign workflow, with outside confirmation when telemetry cannot verify it.

### False positive analysis

- Authorized testing, red-team, malware-analysis, validation, community-module, or admin scripts can retain author strings. Confirm the reconstructed body, exact `user.id` and `host.id` scope, `file.path` or launch context, recognized test or lab records when telemetry cannot prove legitimacy, and no contradictory observables or follow-on activity.
- Before creating an exception, validate recurrence of the same benign workflow with the same `powershell.file.script_block_text` fragment, `file.path` or launch source, and `user.id` or `host.id` scope. Avoid author-string-only exceptions because unrelated offensive scripts can reuse the same handle.

### Response and remediation

- If confirmed benign:
  - Reverse temporary containment and document the reconstructed script, source path, launch context, `user.id`, and `host.id` evidence confirming the legitimate workflow. Build an exception only for that exact workflow and scope.
- If suspicious but unconfirmed:
  - Preserve or export alert details, reconstructed script with fragment metadata, process PID, source path, extracted indicators, and recovered launch details before containment or cleanup.
  - Apply reversible containment tied to the evidence, such as temporary restrictions for extracted destinations or heightened monitoring on affected `host.id` and `user.id`.
  - Escalate to host isolation or stronger account action only if the script is still executing, staging payloads, reaching suspicious destinations, or showing credential or lateral-use evidence, and the host role tolerates isolation.
- If confirmed malicious:
  - Preserve the reconstructed script, recovered process entity ID and launch details, extracted indicators, staged artifacts, and timeline before isolation, process termination, or cleanup.
  - Isolate the host when script capability, launch context, follow-on artifacts, or destination evidence confirms unauthorized activity and the host role tolerates isolation.
  - Block confirmed malicious destinations, URLs, file hashes, and script paths found during triage.
  - Eradicate only dropped files, registry changes, scheduled tasks, services, and follow-on payloads tied to this script, then remediate the path that delivered or launched it.
  - Review related hosts and users for the same author string, reconstructed script body, or extracted indicators before destructive cleanup so scoping is complete.
- Post-incident hardening:
  - Verify PowerShell 4104 logging coverage and retention are sufficient to reconstruct multi-part scripts and preserve process recovery context.
  - Restrict authorized testing of public offensive PowerShell tooling to controlled hosts and identities.
  - Document matched author strings, extracted observables, and author-stripped or rebranded variants surfaced during triage for future analyst reference.
"""

setup = """## Setup

PowerShell Script Block Logging must be enabled to generate the events used by this rule (e.g., 4104).
Setup instructions: https://ela.st/powershell-logging-setup
"""

[rule.investigation_fields]
field_names = [
    "@timestamp",
    "user.name",
    "user.id",
    "user.domain",
    "powershell.file.script_block_text",
    "powershell.file.script_block_id",
    "powershell.sequence",
    "powershell.total",
    "file.path",
    "file.directory",
    "file.name",
    "process.pid",
    "host.name",
    "host.id",
    "powershell.file.script_block_length"
]

[transform]

[[transform.investigate]]
label = "Script block fragments for the same script"
description = ""
providers = [
  [
    { excluded = false, field = "powershell.file.script_block_id", queryType = "phrase", value = "{{powershell.file.script_block_id}}", valueType = "string" },
    { excluded = false, field = "host.id", queryType = "phrase", value = "{{host.id}}", valueType = "string" }
  ]
]
relativeFrom = "now-1h"
relativeTo = "now"

[[transform.investigate]]
label = "Process events for the PowerShell instance"
description = ""
providers = [
  [
    { excluded = false, field = "process.pid", queryType = "phrase", value = "{{process.pid}}", valueType = "string" },
    { excluded = false, field = "host.id", queryType = "phrase", value = "{{host.id}}", valueType = "string" },
    { excluded = false, field = "event.category", queryType = "phrase", value = "process", valueType = "string" }
  ]
]
relativeFrom = "now-1h"
relativeTo = "now"

[[transform.investigate]]
label = "Alerts associated with the user"
description = ""
providers = [
  [
    { excluded = false, field = "event.kind", queryType = "phrase", value = "signal", valueType = "string" },
    { excluded = false, field = "user.id", queryType = "phrase", value = "{{user.id}}", valueType = "string" }
  ]
]
relativeFrom = "now-48h/h"
relativeTo = "now"

[[transform.investigate]]
label = "Alerts associated with the host"
description = ""
providers = [
  [
    { excluded = false, field = "event.kind", queryType = "phrase", value = "signal", valueType = "string" },
    { excluded = false, field = "host.id", queryType = "phrase", value = "{{host.id}}", valueType = "string" }
  ]
]
relativeFrom = "now-48h/h"
relativeTo = "now"

[[transform.investigate]]
label = "File and registry events for the PowerShell PID"
description = ""
providers = [
  [
    { excluded = false, field = "event.category", queryType = "phrase", value = "file", valueType = "string" },
    { excluded = false, field = "host.id", queryType = "phrase", value = "{{host.id}}", valueType = "string" },
    { excluded = false, field = "process.pid", queryType = "phrase", value = "{{process.pid}}", valueType = "string" }
  ],
  [
    { excluded = false, field = "event.category", queryType = "phrase", value = "registry", valueType = "string" },
    { excluded = false, field = "host.id", queryType = "phrase", value = "{{host.id}}", valueType = "string" },
    { excluded = false, field = "process.pid", queryType = "phrase", value = "{{process.pid}}", valueType = "string" }
  ]
]
relativeFrom = "now-1h"
relativeTo = "now"

[[transform.investigate]]
label = "Network and DNS events for the PowerShell PID"
description = ""
providers = [
  [
    { excluded = false, field = "event.category", queryType = "phrase", value = "network", valueType = "string" },
    { excluded = false, field = "host.id", queryType = "phrase", value = "{{host.id}}", valueType = "string" },
    { excluded = false, field = "process.pid", queryType = "phrase", value = "{{process.pid}}", valueType = "string" }
  ],
  [
    { excluded = false, field = "event.category", queryType = "phrase", value = "dns", valueType = "string" },
    { excluded = false, field = "host.id", queryType = "phrase", value = "{{host.id}}", valueType = "string" },
    { excluded = false, field = "process.pid", queryType = "phrase", value = "{{process.pid}}", valueType = "string" }
  ]
]
relativeFrom = "now-1h"
relativeTo = "now"

[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1059"
name = "Command and Scripting Interpreter"
reference = "https://attack.mitre.org/techniques/T1059/"
[[rule.threat.technique.subtechnique]]
id = "T1059.001"
name = "PowerShell"
reference = "https://attack.mitre.org/techniques/T1059/001/"

[rule.threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"