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1 malware family

Y2K Operators

Also known asY2K Operators
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MITRE ATT&CK

Tradecraft

21 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.

9 of 15 tactics28 techniques×N= number of intelligence reports citing this technique
MITRE ATT&CK
TA0001
Initial Access
1 technique
T1195
Supply Chain Compromise
TA0002
Execution
2 techniques
T1059
Command and Scripting Interpreter
T1059.001
PowerShell
T1204
User Execution
T1204.002
Malicious File
TA0003
Persistence
1 technique
T1547
Boot or Logon Autostart Execution
T1547.001
Registry Run Keys / Startup Folder
TA0004
Privilege Escalation
2 techniques
T1547
Boot or Logon Autostart Execution
T1547.001
Registry Run Keys / Startup Folder
T1548
Abuse Elevation Control Mechanism
T1548.002
Bypass User Account Control
TA0005
Stealth
2 techniques
T1027
Obfuscated Files or Information
T1027.009
Embedded Payloads
T1036
Masquerading
TA0006
Credential Access
3 techniques
T1056
Input Capture
T1056.001
Keylogging
T1539
Steal Web Session Cookie
T1555
Credentials from Password Stores
T1555.003
Credentials from Web Browsers
TA0009
Collection
4 techniques
T1056
Input Capture
T1056.001
Keylogging
T1113
Screen Capture
T1123
Audio Capture
T1125
Video Capture
TA0011
Command and Control
2 techniques
T1071
Application Layer Protocol
T1071.001
Web Protocols
T1105
Ingress Tool Transfer
TA0040
Impact
1 technique
T1486
Data Encrypted for Impact
ARSENAL

Associated malware families

1 malware family attributed to this actor across reporting.

FamilyContextEvidenceLast seen
Millenium RATA remote access trojan known as Millenium RAT has been quietly spreading across the globe... The most significant change in version 4 is its full rewrite from .NET into native C++.1Jun 29, 2026
IOCS

Observables

59 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.

59 IOCsView more in app

IOC values are gated. View more in Mallory for domains, IPs, hashes, and other artifacts, or pipe them straight into your SIEM.

ACTIVITY FEED

Recent activity

1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

1 SOURCESView more in app
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Target overlap

Match sector + geo + tech-stack targeting against your real footprint.

Tradecraft mapping21

Every observed MITRE ATT&CK technique, grouped by tactic.

Malware arsenal1

Families this actor is known to deploy, with IOCs and behavior.

Exploited CVEs

CVEs this actor has used in known campaigns.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Observables59

Domains, IPs, and hashes tied to this actor, refreshed continuously.