HackTool - Impacket File Indicators — Sigma Rule

Rule metadata and linked tags

Author: The DFIR Report, IrishDeath. Source status: experimental; severity: high. Source dates: 2025-05-19 / not supplied.

{
  "product": "windows",
  "category": "file_event"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: f2fd3128853f2f28c3705f2ee3fa3976077059c8d5b884cdad8ce353206a37ef

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: HackTool - Impacket File Indicators
id: 03f4ca17-de95-428d-a75a-4ee78b047256
related:
    - id: 6e2a900a-ced9-4e4a-a9c2-13e706f9518a
      type: similar
status: experimental
description: Detects file creation events with filename patterns used by Impacket.
references:
    - https://thedfirreport.com/2025/05/19/another-confluence-bites-the-dust-falling-to-elpaco-team-ransomware/
    - https://github.com/fortra/impacket
author: "The DFIR Report, IrishDeath"
date: 2025-05-19
tags:
    - attack.credential-access
    - attack.t1003.001
logsource:
    product: windows
    category: file_event
detection:
    selection_names_re:
        TargetFilename|re: '\\sessionresume_[a-zA-Z]{8}$' # https://github.com/fortra/impacket/blob/ead516a1209742efc7ac550707a9304ba08681e9/impacket/examples/secretsdump.py#L1925C38-L1925C51
    condition: selection_names_re
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://thedfirreport.com/2025/05/19/another-confluence-bites-the-dust-falling-to-elpaco-team-ransomware/
• https://github.com/fortra/impacket