HOMETHREATSQuietSieve
APT / THREAT GROUP

QuietSieve

2
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 known-sophistication threat actor of undetermined national origin, engaged in cyber operations with a primary motivation of unknown activity patterns.

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

TypeAPT / Threat Group
Aliases2

Also Known As

win.quietsieveQuietSieve

External Intelligence

Malpedia: 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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