Æ / PUBLIC MALWARE INTELLIGENCE

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RainyDay - S0629

Name of ATT&CK software | [RainyDay](https://attack.mitre.org/software/S0629) is a backdoor tool that has been used by [Naikon](https://attack.mitre.org/groups/G0019) since at least 2020.(Citation: Bitdefender Naikon April 2021)

misp:galaxy-name="Malware"misp:galaxy-type="mitre-malware"misp-galaxy:mitre-malware="RainyDay - S0629"

First reported 2025-09-28 19:50 UTCOpen evidence record

Source labels and confidence are preserved. A filename or report mention alone does not establish that a file is malicious. Indicator observation dates describe the cited source; collection dates describe this catalog.