MALWARE FAMILY

QuietSieve

Internal ID: win.quietsieve

aliases

Last seen:Mar 17, 2026

Intelligence Profile

According to Microsoft, this is a heavily obfuscated .NET malware, primarily geared towards the exfiltration of data from the compromised host. But it can also receive and execute a remote payload from the operator.

Threat Analysis

QuietSieve is a malware family tracked by threat intelligence researchers and catalogued in the Malpedia dataset. It represents a distinct malicious software lineage with identifiable code characteristics, behaviors, and victimology.

External References

→https://www.microsoft.com/en-us/security/blog/2022/02/04/actinium-targets-ukrainian-organizations/

→https://www.microsoft.com/security/blog/2022/02/04/actinium-targets-ukrainian-organizations/

Quick Facts

TypeMalware Family

Aliases1

Also Known As

win.quietsieve

Research Links

MITRE ATT&CK VirusTotal Google (news) Twitter/X search

Data sourced from Malpedia, Ransomware.live, RansomLook, and CTIWATCH OSINT collection. Actor attribution is based on available intelligence and may be incomplete.

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