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Execution of known malicious file b86678403d77efbd…

SIGmediumconfidence 72/100generated 2026-10-18

Process image hash tracked by skopnix as predatory-sparrow.

ATT&CK
T1204.002 mitre ↗
Linked actors
Predatory Sparrow
False positives
Scoped to one indicator with skopnix confidence 72/100 from 2 independent sources; checked against RFC1918/reserved space, CDN / cloud / scanner ranges and top-site lists (MISP warninglists), GreyNoise when enriched, and skopnix's benign-infrastructure list. Re-validate against last_seen before blocking: infrastructure is re-assigned.

Sigma rule

skopnix-sigma-ioc-md5-b86678403d77efbdba3d2b1c93500dfc-6d3ac0be.ymldownload .yml ↓
title: Skopnix - Execution of known malicious file b86678403d77efbd…
id: aee47b22-491d-5a49-9a5e-5d4f6332aa52
status: experimental
description: Process image hash tracked by skopnix as predatory-sparrow.
references:
  - https://skopnix.com/ioc/b86678403d77efbdba3d2b1c93500dfc
author: skopnix
date: '2026-10-18'
tags:
  - attack.execution
  - attack.t1204.002
logsource:
  category: process_creation
  product: windows
detection:
  selection:
    Hashes|contains: MD5=B86678403D77EFBDBA3D2B1C93500DFC
  condition: selection
falsepositives:
  - Legitimate services sharing the address; verify against skopnix confidence + last_seen
level: medium

How to deploy on Sigma

  1. 1.Convert for your SIEM with sigma-cli / pySigma, e.g. sigma convert -t splunk -p sysmon rule.yml.
  2. 2.Run it as a hunt first: every rule ships as status experimental.
  3. 3.Promote to an alert once a week of results is clean on your data.

Check · The processing pipeline must map the logsource (firewall, dns, proxy, webserver, process_creation) to your field names.

References