APT / THREAT GROUP

CrimsonIAS

aliases

Last seen:Mar 17, 2026

Intelligence Profile

According to ThreatConnect, CrimsonIAS is a Delphi-written backdoor dating back to at least 2017. It enables operators to run command line tools, exfiltrate files, and upload files to the infected machine. CrimsonIAS is notable as it listens for incoming connections only; making it different from typical Windows backdoors that beacons out.

Threat Analysis

CrimsonIAS 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://threatconnect.com/blog/crimsonias-listening-for-an-3v1l-user-2/

→https://threatconnect.com/blog/crimsonias-listening-for-an-3v1l-user/

Quick Facts

TypeAPT / Threat Group

Aliases2

Also Known As

win.crimsoniasCrimsonIAS

External Intelligence

Malpedia: win.crimsonias

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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