MalwareUsed by 2 actors

BUSYICE

For your environment

Hunt this family in your stack

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THREAT ACTORS

Groups observed using it

2 distinct threat actors attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.

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BlackTech

BUSYICE is HTTP client written in C/C++, which works as both backdoor/downloader

via jsac jpcertjsac.jpcert.or.jp

Earth Hundun

BUSYICE is HTTP client written in C/C++, which works as both backdoor/downloader

via jsac jpcertjsac.jpcert.or.jp

MITRE ATT&CK

Techniques & procedures

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

Initial Access

1 technique

T1566.001Spearphishing AttachmentEvidence1

MITRE ATT&CK ... Initial Access Phishing: Spearphishing Attachment T1566.001 Send SpearPhishing mail with macro-enabled Excel

Execution

1 technique

T1059.003Windows Command ShellEvidence1

BUSYICE is HTTP client written in C/C++, which works as both backdoor/downloader ... OS command to execute via cmd.exe; TELESWORD command SHELL Execute arbitrary command via cmd.exe

Persistence

1 technique

T1037.005Startup ItemsEvidence1

MITRE ATT&CK ... Persistence Boot or Logon Initialization Scripts: Startup Items T1037.005 BUSYICE/SLEFMAKE is executed through startup

Privilege Escalation

1 technique

T1037.005Startup ItemsEvidence1

MITRE ATT&CK ... Persistence Boot or Logon Initialization Scripts: Startup Items T1037.005 BUSYICE/SLEFMAKE is executed through startup

Discovery

3 techniques

T1018Remote System DiscoveryEvidence1

MITRE ATT&CK ... Discovery Remote System Discovery T1018 BUSYICE use “net view” to check current network

T1069.001Local GroupsEvidence1

MITRE ATT&CK ... Discovery Permission Groups Discovery: Local Groups T1069.001 BUSYICE use “net localgroup administrators” to check permission

T1082System Information DiscoveryEvidence1

1ststage backdoor profiles the victim, then downloads 2ndstage backdoor ... BTSDOOR ... Encrypt systeminfo by AES session key ... DELTABEEF 0x00040000 Get detail systeminfo ... TELESWORD COMPUTERINFO Get system info

Command and Control

2 techniques

T1071.001Web ProtocolsEvidence1

MITRE ATT&CK ... Command and Control Application Layer Protocol: Web Protocols T1071.001 BUSYICE/SPIDERPIG uses HTTP/HTTPS for C&C communication

T1105Ingress Tool TransferEvidence1

Download command “ExecYes”: download file from given URI ... TELESWORD command UPLOADFILE Download file from specified URL or Telegram storage ... SPIDERPIG x64 Download EXE and execute

INDICATORS OF COMPROMISE

IOCs tracked for this family

1 indicator attributed across vendor reports, sandbox runs, and researcher write-ups. Full values are available in Mallory.

View more in app

Network

1 tracked

IPs, domains, and DNS infrastructure linked to this family.

TypeValueLatest sighting

ip.v4●●●●●●●●●●●●View more in app—

ACTIVITY FEED

Recent activity

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

2 SOURCESView more in app

jpcert blogNews

Mar 22, 2022

JSAC 2022 -Day 1-

Backdoor associated with Earth Hundun; dropped by LAMICE and linked via overlaps in infrastructure with other Earth Hundun tooling.

jsac jpcertNews

Aug 14, 2026

A custom HTTP backdoor/downloader used in Campaign #1. It profiles victims, communicates with C2 via hidden IE COM objects, executes commands, downloads files, and is linked to Earth Hundun through shared infrastructure with TSCookie.

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 matching1

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

Threat actor attribution2

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 mapping8

Every documented technique, ranked by evidence weight.

Researcher chatter

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

Back to malware

MalwareUsed by 2 actors

BUSYICE

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

THREAT ACTORS

Groups observed using it

2 distinct threat actors attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.

View more details

BlackTech

BUSYICE is HTTP client written in C/C++, which works as both backdoor/downloader

via jsac jpcertjsac.jpcert.or.jp

Earth Hundun

BUSYICE is HTTP client written in C/C++, which works as both backdoor/downloader

via jsac jpcertjsac.jpcert.or.jp

MITRE ATT&CK

Techniques & procedures

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

Initial Access

1 technique

T1566.001Spearphishing AttachmentEvidence1

MITRE ATT&CK ... Initial Access Phishing: Spearphishing Attachment T1566.001 Send SpearPhishing mail with macro-enabled Excel

Execution

1 technique

T1059.003Windows Command ShellEvidence1

BUSYICE is HTTP client written in C/C++, which works as both backdoor/downloader ... OS command to execute via cmd.exe; TELESWORD command SHELL Execute arbitrary command via cmd.exe

Persistence

1 technique

T1037.005Startup ItemsEvidence1

MITRE ATT&CK ... Persistence Boot or Logon Initialization Scripts: Startup Items T1037.005 BUSYICE/SLEFMAKE is executed through startup

Privilege Escalation

1 technique

T1037.005Startup ItemsEvidence1

MITRE ATT&CK ... Persistence Boot or Logon Initialization Scripts: Startup Items T1037.005 BUSYICE/SLEFMAKE is executed through startup

Discovery

3 techniques

T1018Remote System DiscoveryEvidence1

MITRE ATT&CK ... Discovery Remote System Discovery T1018 BUSYICE use “net view” to check current network

T1069.001Local GroupsEvidence1

MITRE ATT&CK ... Discovery Permission Groups Discovery: Local Groups T1069.001 BUSYICE use “net localgroup administrators” to check permission

T1082System Information DiscoveryEvidence1

Command and Control

2 techniques

T1071.001Web ProtocolsEvidence1

MITRE ATT&CK ... Command and Control Application Layer Protocol: Web Protocols T1071.001 BUSYICE/SPIDERPIG uses HTTP/HTTPS for C&C communication

T1105Ingress Tool TransferEvidence1

Download command “ExecYes”: download file from given URI ... TELESWORD command UPLOADFILE Download file from specified URL or Telegram storage ... SPIDERPIG x64 Download EXE and execute

INDICATORS OF COMPROMISE

IOCs tracked for this family

1 indicator attributed across vendor reports, sandbox runs, and researcher write-ups. Full values are available in Mallory.

View more in app

Network

1 tracked

IPs, domains, and DNS infrastructure linked to this family.

TypeValueLatest sighting

ip.v4●●●●●●●●●●●●View more in app—

ACTIVITY FEED

Recent activity

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

2 SOURCESView more in app

jpcert blogNews

Mar 22, 2022

JSAC 2022 -Day 1-

Backdoor associated with Earth Hundun; dropped by LAMICE and linked via overlaps in infrastructure with other Earth Hundun tooling.

jsac jpcertNews

Aug 14, 2026

What this page doesn’t show

The version that knows your environment.

Start free trial

IOC matching1

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

Threat actor attribution2

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 mapping8

Every documented technique, ranked by evidence weight.

Researcher chatter

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