HOMETHREATSOpal Sleet
APT / THREAT GROUP🕵️ ESPIONAGEADVANCED

Opal Sleet

🇰🇵North Korea-attributed
1
campaigns
4
aliases
Last seen:Mar 17, 2026

Intelligence Profile

Konni is a threat actor associated with APT37, a North Korean cyber crime group. They have been active since 2012 and are known for their cyber-espionage activities. Konni has targeted various sectors, including education, government, business organizations, and the cryptocurrency industry. They have exploited vulnerabilities such as CVE-2023-38831 and have used malware like KonniRAT to gain control of victim hosts and steal important information.

Threat Analysis

Opal Sleet is a advanced-sophistication threat actor attributed to North Korea, engaged in cyber operations with a primary motivation of espionage.

The group's espionage-oriented operations suggest a state-sponsored or state-aligned mandate, typically focused on stealing intellectual property, government secrets, or military intelligence. Targets are usually selected for strategic value rather than financial gain.

Classified as an advanced threat actor, Opal Sleet likely develops or acquires zero-day exploits, employs custom malware toolchains, and demonstrates long-term persistence capabilities — hallmarks of a well-resourced operation consistent with nation-state backing.

Known Campaigns

Opal Sleet — Active Operations March 2026

Opal Sleet is a espionage threat actor attributed to North Korea. Konni is a threat actor associated with APT37, a North Korean cyber crime group. They have been active since 2012 and are known for their cyber-espionage activities. Konni has targeted various sectors, including education, government, business organizations, and the cryptocurrenc...

ACTIVEHIGH2026

External References

Quick Facts

TypeAPT / Threat Group
Motivation🕵️ espionage
Sophisticationadvanced
Origin🇰🇵 North Korea
Aliases4
SourceMalpedia

Also Known As

KonniOSMIUMVedaliaOpal Sleet

Research Links

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