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Connection to Commonly Abused Web Services

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Connection to Commonly Abused Web Services

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Adversaries may implement command and control communications that use common web services in order to hide their activity. This attack technique is typically targeted to an organization and uses web services common to the victim network which allows the adversary to blend into legitimate traffic. activity. These popular services are typically targeted since they have most likely been used before a compromise and allow adversaries to blend in the network.

Rule type: eql

Rule indices:

logs-endpoint.events.*

Severity: low

Risk score: 21

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

Elastic
Host
Windows
Threat Detection
Command and Control

Version: 7

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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network where network.protocol == "dns" and
    process.name != null and user.id not in ("S-1-5-18", "S-1-5-19", "S-1-5-20") and
    /* Add new WebSvc domains here */
    dns.question.name :
    (
        "raw.githubusercontent.*",
        "*.pastebin.*",
        "*drive.google.*",
        "*docs.live.*",
        "*api.dropboxapi.*",
        "*dropboxusercontent.*",
        "*onedrive.*",
        "*4shared.*",
        "*.file.io",
        "*filebin.net",
        "*slack-files.com",
        "*ghostbin.*",
        "*ngrok.*",
        "*portmap.*",
        "*serveo.net",
        "*localtunnel.me",
        "*pagekite.me",
        "*localxpose.io",
        "*notabug.org",
        "rawcdn.githack.*",
        "paste.nrecom.net",
        "zerobin.net",
        "controlc.com",
        "requestbin.net",
        "cdn.discordapp.com",
        "discordapp.com",
        "discord.com"
    ) and
    /* Insert noisy false positives here */
    not process.executable :
    (
      "?:\\Program Files\\*.exe",
      "?:\\Program Files (x86)\\*.exe",
      "?:\\Windows\\System32\\WWAHost.exe",
      "?:\\Windows\\System32\\smartscreen.exe",
      "?:\\Windows\\System32\\MicrosoftEdgeCP.exe",
      "?:\\ProgramData\\Microsoft\\Windows Defender\\Platform\\*\\MsMpEng.exe",
      "?:\\Users\\*\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe",
      "?:\\Users\\*\\AppData\\Local\\Programs\\Fiddler\\Fiddler.exe",
      "?:\\Users\\*\\AppData\\Local\\Programs\\Microsoft VS Code\\Code.exe",
      "?:\\Users\\*\\AppData\\Local\\Microsoft\\OneDrive\\OneDrive.exe",
      "?:\\Windows\\system32\\mobsync.exe",
      "?:\\Windows\\SysWOW64\\mobsync.exe",
      "?:\\Users\\*\\AppData\\Local\\Discord\\-*\\Discord.exe"
    )

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Command and Control
- ID: TA0011
- Reference URL: https://attack.mitre.org/tactics/TA0011/
Technique:
- Name: Web Service
- ID: T1102
- Reference URL: https://attack.mitre.org/techniques/T1102/
Tactic:
- Name: Exfiltration
- ID: TA0010
- Reference URL: https://attack.mitre.org/tactics/TA0010/
Technique:
- Name: Exfiltration Over Web Service
- ID: T1567
- Reference URL: https://attack.mitre.org/techniques/T1567/
Sub-technique:
- Name: Exfiltration to Code Repository
- ID: T1567.001
- Reference URL: https://attack.mitre.org/techniques/T1567/001/
Sub-technique:
- Name: Exfiltration to Cloud Storage
- ID: T1567.002
- Reference URL: https://attack.mitre.org/techniques/T1567/002/

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