Suspicious Network Communication With IPFS

Description

Detects connections to interplanetary file system (IPFS) containing a user's email address which mirrors behaviours observed in recent phishing campaigns leveraging IPFS to host credential harvesting webpages.

Query · sigma

selection:
  cs-uri|re: (?i)(ipfs\.io/|ipfs\.io\s).+\..+@.+\.[a-z]+
condition: selection

Known false positives

  • Legitimate use of IPFS being used in the organisation. However the cs-uri regex looking for a user email will likely negate this.
Raw source Suspicious Network Communication With IPFS · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Suspicious Network Communication With IPFS
id: eb6c2004-1cef-427f-8885-9042974e5eb6
status: test
description: Detects connections to interplanetary file system (IPFS) containing a user's email address which mirrors behaviours observed in recent phishing campaigns leveraging IPFS to host credential harvesting webpages.
references:
    - https://blog.talosintelligence.com/ipfs-abuse/
    - https://github.com/Cisco-Talos/IOCs/tree/80caca039988252fbb3f27a2e89c2f2917f582e0/2022/11
    - https://isc.sans.edu/diary/IPFS%20phishing%20and%20the%20need%20for%20correctly%20set%20HTTP%20security%20headers/29638
author: Gavin Knapp
date: 2023-03-16
tags:
    - attack.collection
    - attack.credential-access
    - attack.t1056
logsource:
    category: proxy
detection:
    selection:
        cs-uri|re: '(?i)(ipfs\.io/|ipfs\.io\s).+\..+@.+\.[a-z]+'
    condition: selection
falsepositives:
    - Legitimate use of IPFS being used in the organisation. However the cs-uri regex looking for a user email will likely negate this.
level: low

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