Trusted Design

SYSCON Backdoor Uses FTP as a C&C Channel

概要

Bots can use various methods to establish a line of communication between themselves and their command-and-control (C&C) server. Usually, these are done via HTTP or other TCP/IP connections. However, we recently encountered a botnet that uses a more unusual method: an FTP server that, in effect, acts as a C&C server. Using an FTP server has some advantages. It is less common, and this fact may allow it to slip unnoticed by administrators and researchers. However, this also leaves the C&C traffic open for monitoring by others, including security researchers. In addition, thanks to a coding mistake by the attackers, this particular backdoor does not always run the right commands.

Created: 2026-02-23

Indicators

類似Pulses

このPulseに関連する脅威アクター (事実ベース)

Magic Hound

Score: 17.50
Matched TTPs:
  • T1016.001 - Internet Connection Discovery
  • T1071 - Application Layer Protocol
  • T1505.003 - Web Shell
  • T1090 - Proxy
  • T1573 - Encrypted Channel
  • T1102.002 - Bidirectional Communication
  • T1071.001 - Web Protocols
MITREへのリンク →

HEXANE

Score: 5.14
Matched TTPs:
  • T1016.001 - Internet Connection Discovery
  • T1102.002 - Bidirectional Communication
MITREへのリンク →

APT29

Score: 22.55
Matched TTPs:
  • T1016.001 - Internet Connection Discovery
  • T1505.003 - Web Shell
  • T1090.002 - External Proxy
  • T1550.003 - Pass the Ticket
  • T1568 - Dynamic Resolution
  • T1573 - Encrypted Channel
  • T1090.004 - Domain Fronting
MITREへのリンク →

Gamaredon Group

Score: 25.64
Matched TTPs:
  • T1016.001 - Internet Connection Discovery
  • T1090 - Proxy
  • T1568 - Dynamic Resolution
  • T1041 - Exfiltration Over C2 Channel
  • T1102.003 - One-Way Communication
  • T1001 - Data Obfuscation
  • T1039 - Data from Network Shared Drive
  • T1102.002 - Bidirectional Communication
  • T1071.001 - Web Protocols
MITREへのリンク →

TA2541

Score: 6.03
Matched TTPs:
  • T1016.001 - Internet Connection Discovery
  • T1568 - Dynamic Resolution
MITREへのリンク →

Lotus Blossom

Score: 5.67
Matched TTPs:
  • T1016.001 - Internet Connection Discovery
  • T1090.001 - Internal Proxy
MITREへのリンク →

FIN13

Score: 10.56
Matched TTPs:
  • T1016.001 - Internet Connection Discovery
  • T1021.002 - SMB/Windows Admin Shares
  • T1505.003 - Web Shell
  • T1071.001 - Web Protocols
  • T1090.001 - Internal Proxy
MITREへのリンク →

HAFNIUM

Score: 13.17
Matched TTPs:
  • T1016.001 - Internet Connection Discovery
  • T1583.005 - Botnet
  • T1505.003 - Web Shell
  • T1584.005 - Botnet
  • T1071.001 - Web Protocols
MITREへのリンク →

Turla

Score: 16.37
Matched TTPs:
  • T1016.001 - Internet Connection Discovery
  • T1021.002 - SMB/Windows Admin Shares
  • T1090 - Proxy
  • T1102.002 - Bidirectional Communication
  • T1071.001 - Web Protocols
  • T1584.004 - Server
  • T1090.001 - Internal Proxy
MITREへのリンク →

Volt Typhoon

Score: 16.24
Matched TTPs:
  • T1016.001 - Internet Connection Discovery
  • T1505.003 - Web Shell
  • T1090 - Proxy
  • T1584.005 - Botnet
  • T1584.004 - Server
  • T1090.001 - Internal Proxy
MITREへのリンク →

FIN8

Score: 5.87
Matched TTPs:
  • T1016.001 - Internet Connection Discovery
  • T1021.002 - SMB/Windows Admin Shares
  • T1071.001 - Web Protocols
MITREへのリンク →

APT5

Score: 5.61
Matched TTPs:
  • T1583.005 - Botnet
  • T1505.003 - Web Shell
MITREへのリンク →

Ke3chang

Score: 11.34
Matched TTPs:
  • T1583.005 - Botnet
  • T1021.002 - SMB/Windows Admin Shares
  • T1041 - Exfiltration Over C2 Channel
  • T1071.001 - Web Protocols
  • T1569.002 - Service Execution
MITREへのリンク →

Rocke

Score: 7.91
Matched TTPs:
  • T1071 - Application Layer Protocol
  • T1071.001 - Web Protocols
  • T1102.001 - Dead Drop Resolver
MITREへのリンク →

INC Ransom

Score: 8.43
Matched TTPs:
  • T1071 - Application Layer Protocol
  • T1219 - Remote Access Tools
  • T1569.002 - Service Execution
MITREへのリンク →

Velvet Ant

Score: 14.83
Matched TTPs:
  • T1071 - Application Layer Protocol
  • T1021.002 - SMB/Windows Admin Shares
  • T1569.002 - Service Execution
  • T1090.001 - Internal Proxy
  • T1211 - Exploitation for Defense Evasion
MITREへのリンク →

TeamTNT

Score: 11.35
Matched TTPs:
  • T1071 - Application Layer Protocol
  • T1219 - Remote Access Tools
  • T1048 - Exfiltration Over Alternative Protocol
  • T1071.001 - Web Protocols
MITREへのリンク →

OilRig

Score: 8.98
Matched TTPs:
  • T1219 - Remote Access Tools
  • T1505.003 - Web Shell
  • T1071.001 - Web Protocols
  • T1008 - Fallback Channels
MITREへのリンク →

FIN7

Score: 18.11
Matched TTPs:
  • T1219 - Remote Access Tools
  • T1674 - Input Injection
  • T1210 - Exploitation of Remote Services
  • T1102.002 - Bidirectional Communication
  • T1569.002 - Service Execution
  • T1008 - Fallback Channels
MITREへのリンク →

Medusa Group

Score: 12.48
Matched TTPs:
  • T1219 - Remote Access Tools
  • T1505.003 - Web Shell
  • T1650 - Acquire Access
  • T1071.001 - Web Protocols
  • T1569.002 - Service Execution
MITREへのリンク →

Sandworm Team

Score: 20.65
Matched TTPs:
  • T1219 - Remote Access Tools
  • T1021.002 - SMB/Windows Admin Shares
  • T1505.003 - Web Shell
  • T1090 - Proxy
  • T1584.005 - Botnet
  • T1041 - Exfiltration Over C2 Channel
  • T1102.002 - Bidirectional Communication
  • T1071.001 - Web Protocols
  • T1584.004 - Server
MITREへのリンク →

Carbanak

Score: 4.99
Matched TTPs:
  • T1219 - Remote Access Tools
  • T1102.002 - Bidirectional Communication
MITREへのリンク →

MuddyWater

Score: 17.78
Matched TTPs:
  • T1219 - Remote Access Tools
  • T1218.003 - CMSTP
  • T1090.002 - External Proxy
  • T1041 - Exfiltration Over C2 Channel
  • T1210 - Exploitation of Remote Services
  • T1102.002 - Bidirectional Communication
  • T1071.001 - Web Protocols
MITREへのリンク →

BlackByte

Score: 11.85
Matched TTPs:
  • T1219 - Remote Access Tools
  • T1021.002 - SMB/Windows Admin Shares
  • T1505.003 - Web Shell
  • T1041 - Exfiltration Over C2 Channel
  • T1071.001 - Web Protocols
  • T1569.002 - Service Execution
MITREへのリンク →

Cobalt Group

Score: 10.66
Matched TTPs:
  • T1219 - Remote Access Tools
  • T1218.003 - CMSTP
  • T1218.010 - Regsvr32
  • T1071.001 - Web Protocols
MITREへのリンク →

Moses Staff

Score: 3.70
Matched TTPs:
  • T1021.002 - SMB/Windows Admin Shares
  • T1505.003 - Web Shell
MITREへのリンク →

Wizard Spider

Score: 10.24
Matched TTPs:
  • T1021.002 - SMB/Windows Admin Shares
  • T1041 - Exfiltration Over C2 Channel
  • T1210 - Exploitation of Remote Services
  • T1071.001 - Web Protocols
  • T1569.002 - Service Execution
MITREへのリンク →

APT41

Score: 18.21
Matched TTPs:
  • T1021.002 - SMB/Windows Admin Shares
  • T1090 - Proxy
  • T1071.002 - File Transfer Protocols
  • T1071.001 - Web Protocols
  • T1569.002 - Service Execution
  • T1008 - Fallback Channels
  • T1102.001 - Dead Drop Resolver
MITREへのリンク →

Chimera

Score: 10.53
Matched TTPs:
  • T1021.002 - SMB/Windows Admin Shares
  • T1041 - Exfiltration Over C2 Channel
  • T1039 - Data from Network Shared Drive
  • T1071.001 - Web Protocols
  • T1569.002 - Service Execution
MITREへのリンク →

Fox Kitten

Score: 11.82
Matched TTPs:
  • T1021.002 - SMB/Windows Admin Shares
  • T1505.003 - Web Shell
  • T1090 - Proxy
  • T1210 - Exploitation of Remote Services
  • T1039 - Data from Network Shared Drive
MITREへのリンク →

Play

Score: 6.07
Matched TTPs:
  • T1021.002 - SMB/Windows Admin Shares
  • T1048 - Exfiltration Over Alternative Protocol
MITREへのリンク →

APT3

Score: 6.65
Matched TTPs:
  • T1021.002 - SMB/Windows Admin Shares
  • T1090.002 - External Proxy
  • T1041 - Exfiltration Over C2 Channel
MITREへのリンク →

Blue Mockingbird

Score: 9.42
Matched TTPs:
  • T1021.002 - SMB/Windows Admin Shares
  • T1090 - Proxy
  • T1218.010 - Regsvr32
  • T1569.002 - Service Execution
MITREへのリンク →

APT32

Score: 15.85
Matched TTPs:
  • T1021.002 - SMB/Windows Admin Shares
  • T1505.003 - Web Shell
  • T1550.003 - Pass the Ticket
  • T1041 - Exfiltration Over C2 Channel
  • T1218.010 - Regsvr32
  • T1071.001 - Web Protocols
  • T1569.002 - Service Execution
MITREへのリンク →

Cinnamon Tempest

Score: 4.28
Matched TTPs:
  • T1021.002 - SMB/Windows Admin Shares
  • T1090 - Proxy
MITREへのリンク →

Orangeworm

Score: 3.12
Matched TTPs:
  • T1021.002 - SMB/Windows Admin Shares
  • T1071.001 - Web Protocols
MITREへのリンク →

Lazarus Group

Score: 23.57
Matched TTPs:
  • T1021.002 - SMB/Windows Admin Shares
  • T1090.002 - External Proxy
  • T1041 - Exfiltration Over C2 Channel
  • T1102.002 - Bidirectional Communication
  • T1071.001 - Web Protocols
  • T1584.004 - Server
  • T1027.007 - Dynamic API Resolution
  • T1008 - Fallback Channels
  • T1090.001 - Internal Proxy
MITREへのリンク →

Deep Panda

Score: 6.45
Matched TTPs:
  • T1021.002 - SMB/Windows Admin Shares
  • T1505.003 - Web Shell
  • T1218.010 - Regsvr32
MITREへのリンク →

APT39

Score: 17.33
Matched TTPs:
  • T1021.002 - SMB/Windows Admin Shares
  • T1505.003 - Web Shell
  • T1090.002 - External Proxy
  • T1041 - Exfiltration Over C2 Channel
  • T1102.002 - Bidirectional Communication
  • T1071.001 - Web Protocols
  • T1569.002 - Service Execution
  • T1090.001 - Internal Proxy
MITREへのリンク →

APT28

Score: 19.95
Matched TTPs:
  • T1021.002 - SMB/Windows Admin Shares
  • T1505.003 - Web Shell
  • T1090.002 - External Proxy
  • T1210 - Exploitation of Remote Services
  • T1039 - Data from Network Shared Drive
  • T1102.002 - Bidirectional Communication
  • T1071.001 - Web Protocols
  • T1211 - Exploitation for Defense Evasion
MITREへのリンク →

CURIUM

Score: 3.74
Matched TTPs:
  • T1505.003 - Web Shell
  • T1041 - Exfiltration Over C2 Channel
MITREへのリンク →

Dragonfly

Score: 10.97
Matched TTPs:
  • T1505.003 - Web Shell
  • T1071.002 - File Transfer Protocols
  • T1210 - Exploitation of Remote Services
  • T1584.004 - Server
MITREへのリンク →

Agrius

Score: 3.74
Matched TTPs:
  • T1505.003 - Web Shell
  • T1041 - Exfiltration Over C2 Channel
MITREへのリンク →

Mustang Panda

Score: 13.60
Matched TTPs:
  • T1505.003 - Web Shell
  • T1176.002 - IDE Extensions
  • T1041 - Exfiltration Over C2 Channel
  • T1071.001 - Web Protocols
  • T1027.007 - Dynamic API Resolution
MITREへのリンク →

GALLIUM

Score: 6.48
Matched TTPs:
  • T1505.003 - Web Shell
  • T1090.002 - External Proxy
  • T1041 - Exfiltration Over C2 Channel
MITREへのリンク →

Threat Group-3390

Score: 5.70
Matched TTPs:
  • T1505.003 - Web Shell
  • T1210 - Exploitation of Remote Services
  • T1071.001 - Web Protocols
MITREへのリンク →

Tropic Trooper

Score: 6.58
Matched TTPs:
  • T1505.003 - Web Shell
  • T1573 - Encrypted Channel
  • T1071.001 - Web Protocols
MITREへのリンク →

Ember Bear

Score: 4.51
Matched TTPs:
  • T1505.003 - Web Shell
  • T1210 - Exploitation of Remote Services
MITREへのリンク →

Tonto Team

Score: 7.26
Matched TTPs:
  • T1505.003 - Web Shell
  • T1090.002 - External Proxy
  • T1210 - Exploitation of Remote Services
MITREへのリンク →

APT38

Score: 5.35
Matched TTPs:
  • T1505.003 - Web Shell
  • T1071.001 - Web Protocols
  • T1569.002 - Service Execution
MITREへのリンク →

Leviathan

Score: 13.45
Matched TTPs:
  • T1505.003 - Web Shell
  • T1041 - Exfiltration Over C2 Channel
  • T1102.003 - One-Way Communication
  • T1218.010 - Regsvr32
  • T1584.004 - Server
MITREへのリンク →

Kimsuky

Score: 16.98
Matched TTPs:
  • T1505.003 - Web Shell
  • T1041 - Exfiltration Over C2 Channel
  • T1071.002 - File Transfer Protocols
  • T1218.010 - Regsvr32
  • T1102.002 - Bidirectional Communication
  • T1071.001 - Web Protocols
  • T1102.001 - Dead Drop Resolver
MITREへのリンク →

menuPass

Score: 8.53
Matched TTPs:
  • T1090.002 - External Proxy
  • T1210 - Exploitation of Remote Services
  • T1039 - Data from Network Shared Drive
MITREへのリンク →

Silence

Score: 5.14
Matched TTPs:
  • T1090.002 - External Proxy
  • T1569.002 - Service Execution
MITREへのリンク →

Winter Vivern

Score: 7.70
Matched TTPs:
  • T1056.003 - Web Portal Capture
  • T1041 - Exfiltration Over C2 Channel
  • T1071.001 - Web Protocols
MITREへのリンク →

POLONIUM

Score: 4.74
Matched TTPs:
  • T1090 - Proxy
  • T1102.002 - Bidirectional Communication
MITREへのリンク →

Contagious Interview

Score: 8.85
Matched TTPs:
  • T1090 - Proxy
  • T1041 - Exfiltration Over C2 Channel
  • T1204.004 - Malicious Copy and Paste
MITREへのリンク →

Earth Lusca

Score: 7.92
Matched TTPs:
  • T1090 - Proxy
  • T1210 - Exploitation of Remote Services
  • T1584.004 - Server
MITREへのリンク →

Scattered Spider

Score: 4.31
Matched TTPs:
  • T1090 - Proxy
  • T1041 - Exfiltration Over C2 Channel
MITREへのリンク →

BRONZE BUTLER

Score: 11.35
Matched TTPs:
  • T1550.003 - Pass the Ticket
  • T1039 - Data from Network Shared Drive
  • T1071.001 - Web Protocols
  • T1102.001 - Dead Drop Resolver
MITREへのリンク →

RedEcho

Score: 4.47
Matched TTPs:
  • T1568 - Dynamic Resolution
  • T1071.001 - Web Protocols
MITREへのリンク →

Transparent Tribe

Score: 3.29
Matched TTPs:
  • T1568 - Dynamic Resolution
MITREへのリンク →

BITTER

Score: 8.09
Matched TTPs:
  • T1568 - Dynamic Resolution
  • T1573 - Encrypted Channel
  • T1071.001 - Web Protocols
MITREへのリンク →

Axiom

Score: 8.16
Matched TTPs:
  • T1584.005 - Botnet
  • T1001.002 - Steganography
MITREへのリンク →

PROMETHIUM

Score: 4.13
Matched TTPs:
  • T1205.001 - Port Knocking
MITREへのリンク →

UNC3886

Score: 7.57
Matched TTPs:
  • T1205.001 - Port Knocking
  • T1008 - Fallback Channels
MITREへのリンク →

LuminousMoth

Score: 3.16
Matched TTPs:
  • T1041 - Exfiltration Over C2 Channel
  • T1071.001 - Web Protocols
MITREへのリンク →

Higaisa

Score: 6.09
Matched TTPs:
  • T1041 - Exfiltration Over C2 Channel
  • T1071.001 - Web Protocols
  • T1090.001 - Internal Proxy
MITREへのリンク →

ZIRCONIUM

Score: 4.37
Matched TTPs:
  • T1041 - Exfiltration Over C2 Channel
  • T1102.002 - Bidirectional Communication
MITREへのリンク →

Confucius

Score: 3.16
Matched TTPs:
  • T1041 - Exfiltration Over C2 Channel
  • T1071.001 - Web Protocols
MITREへのリンク →

Stealth Falcon

Score: 3.16
Matched TTPs:
  • T1041 - Exfiltration Over C2 Channel
  • T1071.001 - Web Protocols
MITREへのリンク →

SilverTerrier

Score: 4.81
Matched TTPs:
  • T1071.002 - File Transfer Protocols
  • T1071.001 - Web Protocols
MITREへのリンク →

RedCurl

Score: 4.22
Matched TTPs:
  • T1039 - Data from Network Shared Drive
  • T1071.001 - Web Protocols
MITREへのリンク →

Sowbug

Score: 3.03
Matched TTPs:
  • T1039 - Data from Network Shared Drive
MITREへのリンク →

TA551

Score: 3.93
Matched TTPs:
  • T1218.010 - Regsvr32
  • T1071.001 - Web Protocols
MITREへのリンク →

Inception

Score: 3.93
Matched TTPs:
  • T1218.010 - Regsvr32
  • T1071.001 - Web Protocols
MITREへのリンク →

WIRTE

Score: 3.93
Matched TTPs:
  • T1218.010 - Regsvr32
  • T1071.001 - Web Protocols
MITREへのリンク →

APT19

Score: 3.93
Matched TTPs:
  • T1218.010 - Regsvr32
  • T1071.001 - Web Protocols
MITREへのリンク →

APT37

Score: 3.59
Matched TTPs:
  • T1102.002 - Bidirectional Communication
  • T1071.001 - Web Protocols
MITREへのリンク →

Moonstone Sleet

Score: 3.59
Matched TTPs:
  • T1071.001 - Web Protocols
  • T1569.002 - Service Execution
MITREへのリンク →

Daggerfly

Score: 4.02
Matched TTPs:
  • T1071.001 - Web Protocols
  • T1584.004 - Server
MITREへのリンク →

Mustard Tempest

Score: 4.54
Matched TTPs:
  • T1608.006 - SEO Poisoning
MITREへのリンク →

RTM

Score: 3.29
Matched TTPs:
  • T1102.001 - Dead Drop Resolver
MITREへのリンク →

Patchwork

Score: 3.29
Matched TTPs:
  • T1102.001 - Dead Drop Resolver
MITREへのリンク →

このPulseに関連する脅威アクター (推論ベース)

Gamaredon Group

Score: 0.75
Matched TTPs:
  • T1102.003 - One-Way Communication
  • T1071.001 - Web Protocols
  • T1090 - Proxy
  • T1016.001 - Internet Connection Discovery
  • T1102.002 - Bidirectional Communication
  • T1001 - Data Obfuscation
  • T1568 - Dynamic Resolution
  • T1039 - Data from Network Shared Drive
  • T1041 - Exfiltration Over C2 Channel
MITREへのリンク →

Lazarus Group

Score: 0.70
Matched TTPs:
  • T1071.001 - Web Protocols
  • T1021.002 - SMB/Windows Admin Shares
  • T1090.001 - Internal Proxy
  • T1027.007 - Dynamic API Resolution
  • T1102.002 - Bidirectional Communication
  • T1090.002 - External Proxy
  • T1008 - Fallback Channels
  • T1584.004 - Server
  • T1041 - Exfiltration Over C2 Channel
MITREへのリンク →

APT29

Score: 0.68
Matched TTPs:
  • T1505.003 - Web Shell
  • T1016.001 - Internet Connection Discovery
  • T1090.002 - External Proxy
  • T1090.004 - Domain Fronting
  • T1568 - Dynamic Resolution
  • T1573 - Encrypted Channel
  • T1550.003 - Pass the Ticket
MITREへのリンク →

Sandworm Team

Score: 0.63
Matched TTPs:
  • T1505.003 - Web Shell
  • T1071.001 - Web Protocols
  • T1021.002 - SMB/Windows Admin Shares
  • T1584.005 - Botnet
  • T1090 - Proxy
  • T1102.002 - Bidirectional Communication
  • T1219 - Remote Access Tools
  • T1584.004 - Server
  • T1041 - Exfiltration Over C2 Channel
MITREへのリンク →

APT28

Score: 0.61
Matched TTPs:
  • T1505.003 - Web Shell
  • T1071.001 - Web Protocols
  • T1021.002 - SMB/Windows Admin Shares
  • T1102.002 - Bidirectional Communication
  • T1210 - Exploitation of Remote Services
  • T1090.002 - External Proxy
  • T1211 - Exploitation for Defense Evasion
  • T1039 - Data from Network Shared Drive
MITREへのリンク →

FIN7

Score: 0.59
Matched TTPs:
  • T1674 - Input Injection
  • T1008 - Fallback Channels
  • T1102.002 - Bidirectional Communication
  • T1210 - Exploitation of Remote Services
  • T1569.002 - Service Execution
  • T1219 - Remote Access Tools
MITREへのリンク →

MuddyWater

Score: 0.57
Matched TTPs:
  • T1071.001 - Web Protocols
  • T1218.003 - CMSTP
  • T1102.002 - Bidirectional Communication
  • T1210 - Exploitation of Remote Services
  • T1090.002 - External Proxy
  • T1219 - Remote Access Tools
  • T1041 - Exfiltration Over C2 Channel
MITREへのリンク →

APT41

Score: 0.56
Matched TTPs:
  • T1071.001 - Web Protocols
  • T1021.002 - SMB/Windows Admin Shares
  • T1090 - Proxy
  • T1071.002 - File Transfer Protocols
  • T1569.002 - Service Execution
  • T1008 - Fallback Channels
  • T1102.001 - Dead Drop Resolver
MITREへのリンク →

Magic Hound

Score: 0.56
Matched TTPs:
  • T1505.003 - Web Shell
  • T1071.001 - Web Protocols
  • T1090 - Proxy
  • T1016.001 - Internet Connection Discovery
  • T1102.002 - Bidirectional Communication
  • T1071 - Application Layer Protocol
  • T1573 - Encrypted Channel
MITREへのリンク →

APT39

Score: 0.55
Matched TTPs:
  • T1505.003 - Web Shell
  • T1071.001 - Web Protocols
  • T1021.002 - SMB/Windows Admin Shares
  • T1090.001 - Internal Proxy
  • T1102.002 - Bidirectional Communication
  • T1090.002 - External Proxy
  • T1569.002 - Service Execution
  • T1041 - Exfiltration Over C2 Channel
MITREへのリンク →

Turla

Score: 0.55
Matched TTPs:
  • T1071.001 - Web Protocols
  • T1021.002 - SMB/Windows Admin Shares
  • T1090.001 - Internal Proxy
  • T1090 - Proxy
  • T1016.001 - Internet Connection Discovery
  • T1102.002 - Bidirectional Communication
  • T1584.004 - Server
MITREへのリンク →

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