OffSeq Mirage honeypot sensors detected a malicious file with SHA-256 hash 21e99667e2f0e73d12aae89f8cabd338426ab1fe4ce828ec93c07de615ef754c during attacker activity on 2026-07-01. The observed technique was T1105 (Ingress Tool Transfer), indicating the file was staged or delivered as part of an attack. The file hash corresponds to a malicious payload such as a dropper, web shell, miner, or post-exploitation tool. The attacker infrastructure was identified as being in Poland. This indicator can be used to identify and block this specific malicious payload in affected environments.

The malicious file identified by this hash is associated with attacker activity involving the transfer of tools or payloads into a target environment. Such payloads may facilitate unauthorized access, persistence, resource abuse (e.g., mining), or further exploitation. While no known exploits in the wild are reported for this specific hash, its presence indicates active attacker operations and potential compromise.

No official patch or fix is applicable as this is an indicator of compromise rather than a software vulnerability. Organizations should match this SHA-256 hash against files in their environments, endpoint detection and response (EDR) systems, antivirus (AV) solutions, and threat intelligence feeds to detect and remove the malicious payload. Monitoring for T1105 technique activity and blocking related attacker infrastructure IPs may also help reduce risk.