Sigma rule: Suspicious Non-Browser Network Communication With Reddit API

Rule

Title

Suspicious Non-Browser Network Communication With Reddit API

Status

deprecated

Level

medium

Author

Gavin Knapp

Date

2023/02/16

Modified

2024/02/02

File

deprecated/windows/net_connection_win_reddit_api_non_browser_access.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects an a non-browser process interacting with the Reddit API which could indicate use of a covert C2 such as RedditC2

Log source

product

windows

category

network_connection

Detection

selection:
    DestinationHostname|contains: 'reddit.com' # Match with Reddit API when you can
# Other browsers or apps known to use reddit should be added
# TODO: Add full paths for default install locations
filter_optional_brave:
    Image|endswith: '\brave.exe'
filter_optional_chrome:
    Image:
        - 'C:\Program Files\Google\Chrome\Application\chrome.exe'
        - 'C:\Program Files (x86)\Google\Chrome\Application\chrome.exe'
filter_optional_firefox:
    Image:
        - 'C:\Program Files\Mozilla Firefox\firefox.exe'
        - 'C:\Program Files (x86)\Mozilla Firefox\firefox.exe'
filter_optional_ie:
    Image:
        - 'C:\Program Files (x86)\Internet Explorer\iexplore.exe'
        - 'C:\Program Files\Internet Explorer\iexplore.exe'
filter_optional_maxthon:
    Image|endswith: '\maxthon.exe'
filter_optional_edge_1:
    - Image|startswith: 'C:\Program Files (x86)\Microsoft\EdgeWebView\Application\'
    - Image|endswith: '\WindowsApps\MicrosoftEdge.exe'
    - Image:
          - 'C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe'
          - 'C:\Program Files\Microsoft\Edge\Application\msedge.exe'
filter_optional_edge_2:
    Image|startswith:
        - 'C:\Program Files (x86)\Microsoft\EdgeCore\'
        - 'C:\Program Files\Microsoft\EdgeCore\'
    Image|endswith:
        - '\msedge.exe'
        - '\msedgewebview2.exe'
filter_optional_opera:
    Image|endswith: '\opera.exe'
filter_optional_safari:
    Image|endswith: '\safari.exe'
filter_optional_seamonkey:
    Image|endswith: '\seamonkey.exe'
filter_optional_vivaldi:
    Image|endswith: '\vivaldi.exe'
filter_optional_whale:
    Image|endswith: '\whale.exe'
condition: selection and not 1 of filter_optional_*

False positives (as the rule lists them)

• Legitimate applications communicating with the Reddit API e.g. web browsers not in the exclusion list, app with an RSS etc.

Tags

• attack.command_and_control
• attack.t1102

MITRE ATT&CK ids this rule names

• T1102

References

• https://github.com/kleiton0x00/RedditC2
• https://twitter.com/kleiton0x7e/status/1600567316810551296
• https://www.linkedin.com/posts/kleiton-kurti_github-kleiton0x00redditc2-abusing-reddit-activity-7009939662462984192-5DbI/?originalSubdomain=al

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/deprecated/windows/net_connection_win_reddit_api_non_browser_access.yml