Windows Execution of dnscat2 and iodine DNS Exfiltration/Tunneling Tools

Flags Windows execution of DNS tunneling/exfiltration tools identified by iodine.exe or dnscat2 in process creation events.

FreeReviewedSigma · High · v2

Product: windows
Category: process_creation
Author: Daniil Yugoslavskiy, oscd.community (SigmaHQ), DRL 1.1
Published: 2019-10-24
Updated: 2026-07-31

Analysis Detection

ATT&CK techniques

C2 → Exfiltration

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1071.004DNS
- T1132.001Standard Encoding
Exfiltration
- T1048.001Exfiltration Over Symmetric Encrypted Non-C2 Protocol
Impact

What it detects

This rule identifies process executions on Windows where the binary path ends with iodine.exe or contains dnscat2. These tools are commonly associated with DNS-based exfiltration or tunneling, which can help attackers bypass conventional network controls. The detection relies on process creation telemetry, matching on the executed image filename/path.

Reporting behind it

Related detections9 linkedT1071.004 — drag to rearrange

Malicious Project CAV3RN DNS Configuration Recovery via cloudlanecdn.com (via dns_query)

Suspicious Long Alphanumeric DNS Subdomain Indicative of DNS Tunneling

Suspicious DNS Tunneling With Hex Subdomain To info Domain (via dns_query)

Suspicious DNS Exfiltration to azurestaticprovider Backdoor Domain

Suspicious Script Download via Curl and PowerShell by Dohdoor

DoT (DNS Over TLS) Activation - Command (via process_creation)

DoT (DNS Over TLS) Activation - PowerShell (via powershell)

Possible C2 Beacon with Fixed Authorization URI Parameter via proxy

Suspicious FinCounter DNS Tunneling Query via dns_query

Windows Execution of dnscat2 and iodine DNS Exfiltration/Tunneling Tools

Pivot detection · T1071.004 · 9 related

Changelog

v2
Candidate ingested via manual entry.2026-07-31
v1
No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

windows-dns-exfiltration-tool-execution-via-iodine-exe-or-dnscat2-98a96a5a

title: Windows Execution of dnscat2 and iodine DNS Exfiltration/Tunneling Tools
id: 09de98d0-ef4a-4796-a921-3dec75bc7c61
status: test
description: This rule identifies process executions on Windows where the binary path ends with iodine.exe or contains dnscat2. These tools are commonly associated with DNS-based exfiltration or tunneling, which can help attackers bypass conventional network controls. The detection relies on process creation telemetry, matching on the executed image filename/path.
references:
  - https://github.com/iagox86/dnscat2
  - https://github.com/yarrick/iodine
  - https://github.com/SigmaHQ/sigma/blob/master/rules/windows/process_creation/proc_creation_win_dns_exfiltration_tools_execution.yml
author: Daniil Yugoslavskiy, oscd.community, Huntrule Team
date: 2019-10-24
modified: 2021-11-27
tags:
  - attack.exfiltration
  - attack.t1048.001
  - attack.command-and-control
  - attack.t1071.004
  - attack.t1132.001
logsource:
  category: process_creation
  product: windows
detection:
  selection:
    - Image|endswith: \iodine.exe
    - Image|contains: \dnscat2
  condition: selection
falsepositives:
  - Unlikely
level: high
license: DRL-1.1
related:
  - id: 98a96a5a-64a0-4c42-92c5-489da3866cb0
    type: derived

Convert

This rule as a query you can run. Uses no unlock credit.

SplunkSPL