The Gentlemen & SystemBC: A Sneak Peek Behind the Proxy
The Gentlemen ransomware-as-a-service program has rapidly expanded since mid-2025, claiming over 320 victims with 240 attacks occurring in early 2026. The service provides multi-platform lockers for Windows, Linux, NAS, BSD, and ESXi, enabling comprehensive coverage of corporate environments. During an incident response engagement, an affiliate deployed SystemBC proxy malware for covert tunneling and payload delivery. Analysis of the SystemBC command-and-control server revealed a botnet of over 1,570 victims, primarily corporate and organizational targets. The intrusion progressed from domain controller compromise through credential validation, remote execution via administrative shares, and deployment of Cobalt Strike payloads. Attackers disabled defenses, established persistence through scheduled tasks and services, and ultimately deployed ransomware via Group Policy. The operation demonstrates sophisticated lateral movement capabilities, defense evasion techniques, and integration of mature post-exploit...
AI Analysis
Technical Summary
The Gentlemen RaaS provides multi-platform ransomware targeting diverse corporate environments. Affiliates deploy SystemBC proxy malware to establish covert tunnels and deliver payloads. The intrusion begins with domain controller compromise, followed by credential harvesting and remote execution via administrative shares. Attackers use Cobalt Strike for lateral movement and disable defenses to evade detection. Persistence is established through scheduled tasks and services, culminating in ransomware deployment via Group Policy. Analysis of the SystemBC C2 infrastructure revealed a botnet of over 1,570 victims, indicating widespread impact. The campaign showcases sophisticated lateral movement, defense evasion, and post-exploitation capabilities.
Potential Impact
The threat impacts corporate and organizational networks by enabling attackers to compromise domain controllers, move laterally across environments, disable security defenses, and deploy ransomware that encrypts multiple platforms including Windows, Linux, NAS, BSD, and ESXi. This can result in significant operational disruption and data loss. The large botnet size (1,570+ victims) indicates broad targeting and potential for widespread damage.
Mitigation Recommendations
No official patch or vendor advisory is available for this ransomware-as-a-service or the associated SystemBC malware. Organizations should focus on detecting and preventing initial compromise, credential theft, and lateral movement techniques described. Since this is a mature and active campaign, applying best practices for domain controller security, restricting administrative share access, monitoring for Cobalt Strike and SystemBC indicators, and controlling Group Policy changes are recommended. Patch status is not yet confirmed — check vendor advisories and threat intelligence sources for updates.
Indicators of Compromise
- hash: 3e2272b916da4be3c120d17490423230ab62c174
- hash: 44118d8fb41634b3d8d8b1c6fdf9c421
- hash: 2c27a865b3ab1f0bd2ea1e8f7298b5ef9348c5ac
- hash: cc14df781475ef0f3f2c441d03a622ea67cd86967526f8758ead6f45174db78e
- hash: 3ab9575225e00a83a4ac2b534da5a710bdcf6eb72884944c437b5fbe5c5c9235
- hash: 4200b46a93c6ab059e2b34ce200c4a5b
- hash: 42bcc743c71a9ea083c1c750a398110582796762
- hash: de1a114a2c5552387a1bbb61501bf129
- hash: d6aaed67606d6dab0f652c755d3d363025f60adb
- hash: 62c2c24937d67fdeb43f2c9690ab10e8bb90713af46945048db9a94a465ffcb8
- hash: 860a6177b055a2f5aa61470d17ec3c69da24f1cdf0a782237055cba431158923
- domain: tezwsse5czllksjb7cwp65rvnk4oobmzti2znn42i43bjdfd2prqqkad.onion
- hash: f4ae5b89db5a6a36dbd98287ab7c860a
- hash: 36d968425629b10f38be17787f8afe4b8afa131e
- hash: 992c951f4af57ca7cd8396f5ed69c2199fd6fd4ae5e93726da3e198e78bec0a5
- hash: 30b49ae2f685d4403d3013410f80c2e2
- hash: 5f5bf7fc7a9ac89ce0bbb07bd1160078
- hash: 6ae7c9a7ea0b8c40a64225734f6bd01d
- hash: c9d004384de06bbc53724b1431dc0fde
- hash: 5264a94271d875675336a503c94ece0baceb58c5
- hash: 68225c5613afe2174ed46e074147676b0f9a3915
- hash: 8468cb5888fb383d25f9144c2b2f61c414cea3f8
- hash: 8cdfedf9416ef9e50548f02e5dfa5dd5aa38c586
- hash: 025fc0976c548fb5a880c83ea3eb21a5f23c5d53c4e51e862bb893c11adf712a
- hash: 1eece1e1ba4b96e6c784729f0608ad2939cfb67bc4236dfababbe1d09268960c
- hash: 22b38dad7da097ea03aa28d0614164cd25fafeb1383dbc15047e34c8050f6f67
- hash: 2ed9494e9b7b68415b4eb151c922c82c0191294d0aa443dd2cb5133e6bfe3d5d
- hash: 48d9b2ce4fcd6854a3164ce395d7140014e0b58b77680623f3e4ca22d3a6e7fd
- hash: 5dc607c8990841139768884b1b43e1403496d5a458788a1937be139594f01dca
- hash: 788ba200f776a188c248d6c2029f00b5d34be45d4444f7cb89ffe838c39b8b19
- hash: 87d25d0e5880b3b5cd30106853cbfc6ef1ad38966b30d9bd5b99df46098e546c
- hash: 8c87134c1b45e990e9568f0a3899b0076f94be16d3c40fa824ac1e6c6ee892db
- hash: 91415e0b9fe4e7cbe43ec0558a7adf89423de30d22b00b985c2e4b97e75076b1
- hash: 994d6d1edb57f945f4284cc0163ec998861c7496d85f6d45c08657c9727186e3
- hash: 9f61ff4deb8afced8b1ecdc8787a134c63bde632b18293fbfc94a91749e3e454
- hash: a7a19cab7aab606f833fa8225bc94ec9570a6666660b02cc41a63fe39ea8b0ad
- hash: b67958afc982cafbe1c3f114b444d7f4c91a88a3e7a86f89ab8795ac2110d1e6
- hash: c46b5a18ab3fb5fd1c5c8288a41c75bf0170c10b5e829af89370a12c86dd10f8
- hash: c7f7b5a6e7d93221344e6368c7ab4abf93e162f7567e1a7bcb8786cb8a183a73
- hash: ec368ae0b4369b6ef0da244774995c819c63cffb7fd2132379963b9c1640ccd2
- hash: efaf8e7422ffd09c7f03f1a5b4e5c2cc32b05334c18d1ccb9673667f8f43108f
- hash: f736be55193c77af346dbe905e25f6a1dee3ec1aedca8989ad2088e4f6576b12
- hash: fc75ed2159e0c8274076e46a37671cfb8d677af9f586224da1713df89490a958
- hash: fe1033335a045c696c900d435119d210361966e2fb5cd1ba3382608cfa2c8e68
- url: http://tezwsse5czllksjb7cwp65rvnk4oobmzti2znn42i43bjdfd2prqqkad.onion/
- hash: f1025bb2f147c01742f263bc0b8d462af9728a22
The Gentlemen & SystemBC: A Sneak Peek Behind the Proxy
Description
The Gentlemen ransomware-as-a-service program has rapidly expanded since mid-2025, claiming over 320 victims with 240 attacks occurring in early 2026. The service provides multi-platform lockers for Windows, Linux, NAS, BSD, and ESXi, enabling comprehensive coverage of corporate environments. During an incident response engagement, an affiliate deployed SystemBC proxy malware for covert tunneling and payload delivery. Analysis of the SystemBC command-and-control server revealed a botnet of over 1,570 victims, primarily corporate and organizational targets. The intrusion progressed from domain controller compromise through credential validation, remote execution via administrative shares, and deployment of Cobalt Strike payloads. Attackers disabled defenses, established persistence through scheduled tasks and services, and ultimately deployed ransomware via Group Policy. The operation demonstrates sophisticated lateral movement capabilities, defense evasion techniques, and integration of mature post-exploit...
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Gentlemen RaaS provides multi-platform ransomware targeting diverse corporate environments. Affiliates deploy SystemBC proxy malware to establish covert tunnels and deliver payloads. The intrusion begins with domain controller compromise, followed by credential harvesting and remote execution via administrative shares. Attackers use Cobalt Strike for lateral movement and disable defenses to evade detection. Persistence is established through scheduled tasks and services, culminating in ransomware deployment via Group Policy. Analysis of the SystemBC C2 infrastructure revealed a botnet of over 1,570 victims, indicating widespread impact. The campaign showcases sophisticated lateral movement, defense evasion, and post-exploitation capabilities.
Potential Impact
The threat impacts corporate and organizational networks by enabling attackers to compromise domain controllers, move laterally across environments, disable security defenses, and deploy ransomware that encrypts multiple platforms including Windows, Linux, NAS, BSD, and ESXi. This can result in significant operational disruption and data loss. The large botnet size (1,570+ victims) indicates broad targeting and potential for widespread damage.
Mitigation Recommendations
No official patch or vendor advisory is available for this ransomware-as-a-service or the associated SystemBC malware. Organizations should focus on detecting and preventing initial compromise, credential theft, and lateral movement techniques described. Since this is a mature and active campaign, applying best practices for domain controller security, restricting administrative share access, monitoring for Cobalt Strike and SystemBC indicators, and controlling Group Policy changes are recommended. Patch status is not yet confirmed — check vendor advisories and threat intelligence sources for updates.
Technical Details
- Author
- AlienVault
- Tlp
- white
- References
- ["https://research.checkpoint.com/2026/dfir-report-the-gentlemen/"]
- Adversary
- The Gentlemen
- Pulse Id
- 69e63f93a0ddbd53fcab3f51
- Threat Score
- null
Indicators of Compromise
Hash
| Value | Description | Copy |
|---|---|---|
hash3e2272b916da4be3c120d17490423230ab62c174 | — | |
hash44118d8fb41634b3d8d8b1c6fdf9c421 | — | |
hash2c27a865b3ab1f0bd2ea1e8f7298b5ef9348c5ac | — | |
hashcc14df781475ef0f3f2c441d03a622ea67cd86967526f8758ead6f45174db78e | — | |
hash3ab9575225e00a83a4ac2b534da5a710bdcf6eb72884944c437b5fbe5c5c9235 | — | |
hash4200b46a93c6ab059e2b34ce200c4a5b | — | |
hash42bcc743c71a9ea083c1c750a398110582796762 | — | |
hashde1a114a2c5552387a1bbb61501bf129 | — | |
hashd6aaed67606d6dab0f652c755d3d363025f60adb | — | |
hash62c2c24937d67fdeb43f2c9690ab10e8bb90713af46945048db9a94a465ffcb8 | — | |
hash860a6177b055a2f5aa61470d17ec3c69da24f1cdf0a782237055cba431158923 | — | |
hashf4ae5b89db5a6a36dbd98287ab7c860a | — | |
hash36d968425629b10f38be17787f8afe4b8afa131e | — | |
hash992c951f4af57ca7cd8396f5ed69c2199fd6fd4ae5e93726da3e198e78bec0a5 | — | |
hash30b49ae2f685d4403d3013410f80c2e2 | — | |
hash5f5bf7fc7a9ac89ce0bbb07bd1160078 | — | |
hash6ae7c9a7ea0b8c40a64225734f6bd01d | — | |
hashc9d004384de06bbc53724b1431dc0fde | — | |
hash5264a94271d875675336a503c94ece0baceb58c5 | — | |
hash68225c5613afe2174ed46e074147676b0f9a3915 | — | |
hash8468cb5888fb383d25f9144c2b2f61c414cea3f8 | — | |
hash8cdfedf9416ef9e50548f02e5dfa5dd5aa38c586 | — | |
hash025fc0976c548fb5a880c83ea3eb21a5f23c5d53c4e51e862bb893c11adf712a | — | |
hash1eece1e1ba4b96e6c784729f0608ad2939cfb67bc4236dfababbe1d09268960c | — | |
hash22b38dad7da097ea03aa28d0614164cd25fafeb1383dbc15047e34c8050f6f67 | — | |
hash2ed9494e9b7b68415b4eb151c922c82c0191294d0aa443dd2cb5133e6bfe3d5d | — | |
hash48d9b2ce4fcd6854a3164ce395d7140014e0b58b77680623f3e4ca22d3a6e7fd | — | |
hash5dc607c8990841139768884b1b43e1403496d5a458788a1937be139594f01dca | — | |
hash788ba200f776a188c248d6c2029f00b5d34be45d4444f7cb89ffe838c39b8b19 | — | |
hash87d25d0e5880b3b5cd30106853cbfc6ef1ad38966b30d9bd5b99df46098e546c | — | |
hash8c87134c1b45e990e9568f0a3899b0076f94be16d3c40fa824ac1e6c6ee892db | — | |
hash91415e0b9fe4e7cbe43ec0558a7adf89423de30d22b00b985c2e4b97e75076b1 | — | |
hash994d6d1edb57f945f4284cc0163ec998861c7496d85f6d45c08657c9727186e3 | — | |
hash9f61ff4deb8afced8b1ecdc8787a134c63bde632b18293fbfc94a91749e3e454 | — | |
hasha7a19cab7aab606f833fa8225bc94ec9570a6666660b02cc41a63fe39ea8b0ad | — | |
hashb67958afc982cafbe1c3f114b444d7f4c91a88a3e7a86f89ab8795ac2110d1e6 | — | |
hashc46b5a18ab3fb5fd1c5c8288a41c75bf0170c10b5e829af89370a12c86dd10f8 | — | |
hashc7f7b5a6e7d93221344e6368c7ab4abf93e162f7567e1a7bcb8786cb8a183a73 | — | |
hashec368ae0b4369b6ef0da244774995c819c63cffb7fd2132379963b9c1640ccd2 | — | |
hashefaf8e7422ffd09c7f03f1a5b4e5c2cc32b05334c18d1ccb9673667f8f43108f | — | |
hashf736be55193c77af346dbe905e25f6a1dee3ec1aedca8989ad2088e4f6576b12 | — | |
hashfc75ed2159e0c8274076e46a37671cfb8d677af9f586224da1713df89490a958 | — | |
hashfe1033335a045c696c900d435119d210361966e2fb5cd1ba3382608cfa2c8e68 | — | |
hashf1025bb2f147c01742f263bc0b8d462af9728a22 | — |
Domain
| Value | Description | Copy |
|---|---|---|
domaintezwsse5czllksjb7cwp65rvnk4oobmzti2znn42i43bjdfd2prqqkad.onion | — |
Url
| Value | Description | Copy |
|---|---|---|
urlhttp://tezwsse5czllksjb7cwp65rvnk4oobmzti2znn42i43bjdfd2prqqkad.onion/ | — |
Threat ID: 69e654cd19fe3cd2cd11382a
Added to database: 4/20/2026, 4:31:09 PM
Last enriched: 4/20/2026, 4:46:04 PM
Last updated: 4/21/2026, 7:05:31 AM
Views: 78
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