MALWARE FAMILY

CrimsonIAS

Internal ID: win.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 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://threatconnect.com/blog/crimsonias-listening-for-an-3v1l-user-2/

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

Quick Facts

TypeMalware Family

Aliases1

Also Known As

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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