Malware

HAPPYWORK

HAPPYWORK is a downloader used by APT37 to target South Korean government and financial victims in November 2016. (Citation: FireEye APT37 Feb 2018)

For your environment

Hunt this family in your stack

Mallory pivots from this family to the IOCs, detections, and named campaigns that touch your stack, and pages you when something new lands.

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MITRE ATT&CK

Techniques & procedures

3 distinct techniques documented for this family, organized by ATT&CK tactic.

Discovery

2 techniques

T1033System Owner/User DiscoveryEvidence6

The content repeatedly describes malware and threat actors collecting the victim username, identifying logged-in users, running whoami, query user, quser, or similar commands to determine the current user or user sessions.

T1082System Information DiscoveryEvidence10

The content repeatedly describes malware and threat actors collecting OS version, computer name, architecture, CPU, memory, disk, language, and other host details; examples include use of commands such as ver, systeminfo, hostname, uname -m, sw_vers -productVersion, and fsutil.

Command and Control

1 technique

T1105Ingress Tool TransferEvidence2

The content repeatedly describes malware and threat actors that can "download files from C2," "download additional payloads," "upload and download files," "retrieve payloads from the C2 server," and "copy files to remote machines."

ACTIVITY FEED

Recent activity

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

4 SOURCESView more in app

mitre attack websiteNews

Oct 25, 2022

System Owner/User Discovery, Technique T1033 - Enterprise | MITRE ATT&CK®

Backdoor that can collect the victim username.

mitre attack websiteNews

Oct 21, 2021

System Owner/User Discovery, Technique T1033 - Enterprise | MITRE ATT&CK®

Collects the victim username.

mitre attack websiteNews

Mar 20, 2015

System Owner/User Discovery, Technique T1033 - Enterprise | MITRE ATT&CK®

Malware that can collect the victim username.

mitre attackNews

Mar 18, 2026

System Owner/User Discovery, Technique T1033 - Enterprise | MITRE ATT&CK®

Backdoor; here it is noted collecting the victim username.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets match these IOCs, which detections are missing, which campaigns to expect next, and what to do in the next 30 minutes.

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IOC matching

Match every observed IP, domain, and hash against your live telemetry.

Threat actor attribution

Named campaigns wielding this family, with evidence pinned to each claim.

Exploited vulnerabilities

CVEs this family uses for access and lateral movement.

Detection signatures

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

MITRE ATT&CK mapping3

Every documented technique, ranked by evidence weight.

Researcher chatter

Reddit, Mastodon, and CTI community discussion around this family.

Back to malware

Malware

HAPPYWORK

HAPPYWORK is a downloader used by APT37 to target South Korean government and financial victims in November 2016. (Citation: FireEye APT37 Feb 2018)

For your environment

Hunt this family in your stack

Mallory pivots from this family to the IOCs, detections, and named campaigns that touch your stack, and pages you when something new lands.

Start free trial

MITRE ATT&CK

Techniques & procedures

3 distinct techniques documented for this family, organized by ATT&CK tactic.

Discovery

2 techniques

T1033System Owner/User DiscoveryEvidence6

T1082System Information DiscoveryEvidence10

Command and Control

1 technique

T1105Ingress Tool TransferEvidence2

ACTIVITY FEED

Recent activity

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

4 SOURCESView more in app

mitre attack websiteNews

Oct 25, 2022

System Owner/User Discovery, Technique T1033 - Enterprise | MITRE ATT&CK®

Backdoor that can collect the victim username.

mitre attack websiteNews

Oct 21, 2021

System Owner/User Discovery, Technique T1033 - Enterprise | MITRE ATT&CK®

Collects the victim username.

mitre attack websiteNews

Mar 20, 2015

System Owner/User Discovery, Technique T1033 - Enterprise | MITRE ATT&CK®

Malware that can collect the victim username.

mitre attackNews

Mar 18, 2026

System Owner/User Discovery, Technique T1033 - Enterprise | MITRE ATT&CK®

Backdoor; here it is noted collecting the victim username.

What this page doesn’t show

The version that knows your environment.

Start free trial

IOC matching

Match every observed IP, domain, and hash against your live telemetry.

Threat actor attribution

Named campaigns wielding this family, with evidence pinned to each claim.

Exploited vulnerabilities

CVEs this family uses for access and lateral movement.

Detection signatures

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

MITRE ATT&CK mapping3

Every documented technique, ranked by evidence weight.

Researcher chatter

Reddit, Mastodon, and CTI community discussion around this family.