Interlock ransomware evolving under the radar
The Interlock ransomware group, active since September 2024, has shown adaptability and innovation in its tactics despite a relatively low victim count. They employ fake browser updates and the ClickFix technique for initial access, followed by a multi-stage attack chain involving PowerShell backdoors, credential stealers, and a custom Remote Access Trojan. The group targets various sectors across North America and Europe, conducting Big Game Hunting and double extortion campaigns. Interlock has been observed improving their tools, including evolving their PowerShell backdoor and modifying their ransom notes to emphasize legal repercussions. The group's focus on maintaining relevance while avoiding large-scale visibility suggests a strategic approach to their operations.
AI Analysis
Technical Summary
The Interlock ransomware group, active since September 2024, represents a sophisticated and evolving threat actor specializing in targeted ransomware attacks, often referred to as Big Game Hunting. Despite maintaining a relatively low victim count, Interlock demonstrates significant adaptability and innovation in its attack methodologies. Initial access is typically gained through social engineering tactics such as fake browser updates and exploitation of the ClickFix technique, which is known for leveraging vulnerabilities in user interaction flows to deploy malicious payloads. Once inside a network, the group employs a multi-stage attack chain that includes deploying PowerShell backdoors, which allow stealthy and persistent command execution within compromised environments. Additionally, they utilize credential stealers, notably the Berserk Stealer, to harvest sensitive authentication data, facilitating lateral movement and privilege escalation. A custom Remote Access Trojan (RAT), referred to as the Interlock RAT, is also deployed to maintain long-term access and control over infected systems. The group’s operational tactics include double extortion, where data is not only encrypted but also exfiltrated, with threats to leak sensitive information if ransom demands are not met. This approach increases pressure on victims to comply. Interlock has been observed refining their tools continuously, including enhancements to their PowerShell backdoor capabilities and modifications to ransom notes to emphasize potential legal consequences, likely as a psychological tactic to coerce victims. Their strategic focus on avoiding large-scale visibility while maintaining operational effectiveness suggests a deliberate effort to evade detection and prolong their campaigns. The group targets multiple sectors across North America and Europe, indicating a broad geographic and vertical scope.
Potential Impact
For European organizations, the Interlock ransomware group poses a significant risk, particularly to high-value targets such as critical infrastructure, financial institutions, healthcare providers, and large enterprises. The use of credential stealers and PowerShell backdoors can lead to extensive network compromise, data breaches, and operational disruption. The double extortion tactic exacerbates the impact by threatening data confidentiality and potentially causing reputational damage and regulatory penalties under GDPR. The stealthy nature of their attacks and continuous tool evolution complicate detection and response efforts. Organizations may face prolonged downtime, costly incident response, and potential legal liabilities. The emphasis on legal repercussions in ransom notes may increase psychological pressure on European victims, potentially influencing ransom payment decisions. Given the group's focus on Big Game Hunting, large organizations with complex IT environments are at heightened risk, especially those with insufficient segmentation and outdated detection capabilities.
Mitigation Recommendations
European organizations should implement targeted defenses against the specific tactics employed by Interlock. This includes rigorous user awareness training focused on recognizing fake browser updates and social engineering attempts. Deploy advanced endpoint detection and response (EDR) solutions capable of identifying suspicious PowerShell activity and anomalous credential access patterns. Network segmentation should be enforced to limit lateral movement, alongside strict access controls and multi-factor authentication to mitigate credential theft impacts. Regularly audit and monitor PowerShell logs and employ application whitelisting to restrict unauthorized script execution. Incident response plans must incorporate scenarios involving double extortion ransomware, including secure offline backups and data exfiltration detection capabilities. Organizations should also engage in threat intelligence sharing to stay updated on Interlock’s evolving tactics. Given the absence of patches, proactive threat hunting for indicators of compromise related to Interlock’s tools, such as the Interlock RAT and Berserk Stealer, is critical. Legal and compliance teams should prepare for potential data breach notifications and coordinate with law enforcement as appropriate.
Affected Countries
Germany, France, United Kingdom, Netherlands, Italy, Spain, Belgium, Sweden
Indicators of Compromise
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- url: http://ebhmkoohccl45qesdbvrjqtyro2hmhkmh6vkyfyjjzfllm3ix72aqaid.onion
- url: http://topsportracing.com/az10
- url: http://topsportracing.com/wp-25
- url: http://topsportracing.com/wp-az
- url: https://advanceipscaner.com/additional-check.html
- url: https://airbluefootgear.com/wp-includes/images/xits.php
- url: https://album-anthony-rn-submission.trycloudflare.com/25423565
- url: https://apple-online.shop/ChromeSetup.exe
- url: https://apple-online.shop/MSTeamsSetup.exe
- url: https://apple-online.shop/MicrosoftEdgeSetup.exe
- url: https://dc-broader-green-norwegian.trycloudflare.com/12341234
- url: https://diff-beats-belize-chapter.trycloudflare.com/12341234
- url: https://ecologilives.com/additional-check.html
- url: https://forest-offensive-height-letters.trycloudflare.com/12341234
- url: https://lcd-add-palace-switching.trycloudflare.com/12341234
- url: https://metro-offset-imposed-behind.trycloudflare.com/ytjstast
- url: https://microsoft-msteams.com/additional-check.html
- url: https://microstteams.com/additional-check.html
- url: https://phones-pichunter-businesses-drop.trycloudflare.com/12341234
- url: https://pub-motorola-viking-charger.trycloudflare.com/12341234
- url: https://santa-reflection-capitol-classifieds.trycloudflare.com/12341234
- url: https://spa-step-hopkins-islands.trycloudflare.com/erfgtrtt
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- hash: c0803468951064865186780201d348e38465afc5
- hash: d989ecca44efd8aeb5ed69120d404553312afc07
- domain: advanceipscaner.com
- domain: ebhmkoohccl45qesdbvrjqtyro2hmhkmh6vkyfyjjzfllm3ix72aqaid.onion
- domain: ecologilives.com
- domain: microsoft-msteams.com
- domain: microstteams.com
- domain: album-anthony-rn-submission.trycloudflare.com
- domain: analytical-russell-cincinnati-settings.trycloudflare.com
- domain: bristol-weed-martin-know.trycloudflare.com
- domain: california-appeals-pilot-harper.trycloudflare.com
- domain: casting-advisors-older-invitations.trycloudflare.com
- domain: complement-parliamentary-chairs-hc.trycloudflare.com
- domain: dc-broader-green-norwegian.trycloudflare.com
- domain: diff-beats-belize-chapter.trycloudflare.com
- domain: forest-offensive-height-letters.trycloudflare.com
- domain: fotos-phillips-princess-baker.trycloudflare.com
- domain: investigators-boxing-trademark-threatened.trycloudflare.com
- domain: lancaster-sean-initial-ru.trycloudflare.com
- domain: lcd-add-palace-switching.trycloudflare.com
- domain: medicine-podcasts-halo-expected.trycloudflare.com
- domain: metro-offset-imposed-behind.trycloudflare.com
- domain: mortgage-i-concrete-origins.trycloudflare.com
- domain: musicians-implied-less-model.trycloudflare.com
- domain: open-exceptions-cleared-feelings.trycloudflare.com
- domain: phones-pichunter-businesses-drop.trycloudflare.com
- domain: photo-auction-visual-gains.trycloudflare.com
- domain: pipe-hawaii-monkey-automatic.trycloudflare.com
- domain: pub-motorola-viking-charger.trycloudflare.com
- domain: refrigerator-cheers-indicator-ferrari.trycloudflare.com
- domain: santa-reflection-capitol-classifieds.trycloudflare.com
- domain: scientific-shown-desperate-ratio.trycloudflare.com
- domain: securities-variance-vocal-temporal.trycloudflare.com
- domain: spa-step-hopkins-islands.trycloudflare.com
- domain: speak-head-somebody-stays.trycloudflare.com
- domain: strain-brighton-focused-kw.trycloudflare.com
- domain: sublime-forecasts-pale-scored.trycloudflare.com
- domain: suffering-arnold-satisfaction-prior.trycloudflare.com
- domain: una-idol-ta-missile.trycloudflare.com
- domain: views-ethics-orientation-roommate.trycloudflare.com
- domain: washing-cartridges-watts-flags.trycloudflare.com
- domain: www.sublime-forecasts-pale-scored.trycloudflare.com
Interlock ransomware evolving under the radar
Description
The Interlock ransomware group, active since September 2024, has shown adaptability and innovation in its tactics despite a relatively low victim count. They employ fake browser updates and the ClickFix technique for initial access, followed by a multi-stage attack chain involving PowerShell backdoors, credential stealers, and a custom Remote Access Trojan. The group targets various sectors across North America and Europe, conducting Big Game Hunting and double extortion campaigns. Interlock has been observed improving their tools, including evolving their PowerShell backdoor and modifying their ransom notes to emphasize legal repercussions. The group's focus on maintaining relevance while avoiding large-scale visibility suggests a strategic approach to their operations.
AI-Powered Analysis
Technical Analysis
The Interlock ransomware group, active since September 2024, represents a sophisticated and evolving threat actor specializing in targeted ransomware attacks, often referred to as Big Game Hunting. Despite maintaining a relatively low victim count, Interlock demonstrates significant adaptability and innovation in its attack methodologies. Initial access is typically gained through social engineering tactics such as fake browser updates and exploitation of the ClickFix technique, which is known for leveraging vulnerabilities in user interaction flows to deploy malicious payloads. Once inside a network, the group employs a multi-stage attack chain that includes deploying PowerShell backdoors, which allow stealthy and persistent command execution within compromised environments. Additionally, they utilize credential stealers, notably the Berserk Stealer, to harvest sensitive authentication data, facilitating lateral movement and privilege escalation. A custom Remote Access Trojan (RAT), referred to as the Interlock RAT, is also deployed to maintain long-term access and control over infected systems. The group’s operational tactics include double extortion, where data is not only encrypted but also exfiltrated, with threats to leak sensitive information if ransom demands are not met. This approach increases pressure on victims to comply. Interlock has been observed refining their tools continuously, including enhancements to their PowerShell backdoor capabilities and modifications to ransom notes to emphasize potential legal consequences, likely as a psychological tactic to coerce victims. Their strategic focus on avoiding large-scale visibility while maintaining operational effectiveness suggests a deliberate effort to evade detection and prolong their campaigns. The group targets multiple sectors across North America and Europe, indicating a broad geographic and vertical scope.
Potential Impact
For European organizations, the Interlock ransomware group poses a significant risk, particularly to high-value targets such as critical infrastructure, financial institutions, healthcare providers, and large enterprises. The use of credential stealers and PowerShell backdoors can lead to extensive network compromise, data breaches, and operational disruption. The double extortion tactic exacerbates the impact by threatening data confidentiality and potentially causing reputational damage and regulatory penalties under GDPR. The stealthy nature of their attacks and continuous tool evolution complicate detection and response efforts. Organizations may face prolonged downtime, costly incident response, and potential legal liabilities. The emphasis on legal repercussions in ransom notes may increase psychological pressure on European victims, potentially influencing ransom payment decisions. Given the group's focus on Big Game Hunting, large organizations with complex IT environments are at heightened risk, especially those with insufficient segmentation and outdated detection capabilities.
Mitigation Recommendations
European organizations should implement targeted defenses against the specific tactics employed by Interlock. This includes rigorous user awareness training focused on recognizing fake browser updates and social engineering attempts. Deploy advanced endpoint detection and response (EDR) solutions capable of identifying suspicious PowerShell activity and anomalous credential access patterns. Network segmentation should be enforced to limit lateral movement, alongside strict access controls and multi-factor authentication to mitigate credential theft impacts. Regularly audit and monitor PowerShell logs and employ application whitelisting to restrict unauthorized script execution. Incident response plans must incorporate scenarios involving double extortion ransomware, including secure offline backups and data exfiltration detection capabilities. Organizations should also engage in threat intelligence sharing to stay updated on Interlock’s evolving tactics. Given the absence of patches, proactive threat hunting for indicators of compromise related to Interlock’s tools, such as the Interlock RAT and Berserk Stealer, is critical. Legal and compliance teams should prepare for potential data breach notifications and coordinate with law enforcement as appropriate.
Affected Countries
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Technical Details
- Author
- AlienVault
- Tlp
- white
- References
- ["https://blog.sekoia.io/interlock-ransomware-evolving-under-the-radar"]
- Adversary
- Interlock
Indicators of Compromise
Hash
| Value | Description | Copy |
|---|---|---|
hash008a8c6d9e40a2a4d3a4f5eaae933458 | — | |
hash0370bb98a484927c0f92d56dc4df570b | — | |
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hasheaca86a3f397d10d9188be9fcd2af1a7a30a9b573b2282b0b8300efeb5ff1efd | — | |
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hasheb587b2603dfc14b420865bb862fc905cb85fe7b4b5a781a19929fc2da88eb34 | — | |
hashf02622129e7774b7673e2a9f62bb4a208d4a142b5d925532c7920481549bd07b | — | |
hashf1df43fe0f95de6badfb710827cdc7272e6654f108ef2cfcb2a01aca089f0624 | — | |
hashf613966b6ed1f080aacba005b1e48268ef662fffdf9894382299645f42900848 | — | |
hashf6c7ecff7b07cba12bd79833a23d12d5fcd12a75a3394d923b994ba0ed535db3 | — | |
hashf962e15c6efebb3c29fe399bb168066042b616affddd83f72570c979184ec55c | — | |
hashfdd4e0bb2a4475e4e44154d7bf29490de98496553af3c8807f999ab8b920263f | — | |
hash05d849fee782da2f7455995585a549f134ef2e3c | — | |
hash0a33d0cbfe206a9f8853fbcd7beccb05f5722d11 | — | |
hash743be93af36f51283a4b6e470d09d235e3f8eeeb | — | |
hashc0803468951064865186780201d348e38465afc5 | — | |
hashd989ecca44efd8aeb5ed69120d404553312afc07 | — |
Url
| Value | Description | Copy |
|---|---|---|
urlhttp://ebhmkoohccl45qesdbvrjqtyro2hmhkmh6vkyfyjjzfllm3ix72aqaid.onion | — | |
urlhttp://topsportracing.com/az10 | — | |
urlhttp://topsportracing.com/wp-25 | — | |
urlhttp://topsportracing.com/wp-az | — | |
urlhttps://advanceipscaner.com/additional-check.html | — | |
urlhttps://airbluefootgear.com/wp-includes/images/xits.php | — | |
urlhttps://album-anthony-rn-submission.trycloudflare.com/25423565 | — | |
urlhttps://apple-online.shop/ChromeSetup.exe | — | |
urlhttps://apple-online.shop/MSTeamsSetup.exe | — | |
urlhttps://apple-online.shop/MicrosoftEdgeSetup.exe | — | |
urlhttps://dc-broader-green-norwegian.trycloudflare.com/12341234 | — | |
urlhttps://diff-beats-belize-chapter.trycloudflare.com/12341234 | — | |
urlhttps://ecologilives.com/additional-check.html | — | |
urlhttps://forest-offensive-height-letters.trycloudflare.com/12341234 | — | |
urlhttps://lcd-add-palace-switching.trycloudflare.com/12341234 | — | |
urlhttps://metro-offset-imposed-behind.trycloudflare.com/ytjstast | — | |
urlhttps://microsoft-msteams.com/additional-check.html | — | |
urlhttps://microstteams.com/additional-check.html | — | |
urlhttps://phones-pichunter-businesses-drop.trycloudflare.com/12341234 | — | |
urlhttps://pub-motorola-viking-charger.trycloudflare.com/12341234 | — | |
urlhttps://santa-reflection-capitol-classifieds.trycloudflare.com/12341234 | — | |
urlhttps://spa-step-hopkins-islands.trycloudflare.com/erfgtrtt | — |
Domain
| Value | Description | Copy |
|---|---|---|
domainadvanceipscaner.com | — | |
domainebhmkoohccl45qesdbvrjqtyro2hmhkmh6vkyfyjjzfllm3ix72aqaid.onion | — | |
domainecologilives.com | — | |
domainmicrosoft-msteams.com | — | |
domainmicrostteams.com | — | |
domainalbum-anthony-rn-submission.trycloudflare.com | — | |
domainanalytical-russell-cincinnati-settings.trycloudflare.com | — | |
domainbristol-weed-martin-know.trycloudflare.com | — | |
domaincalifornia-appeals-pilot-harper.trycloudflare.com | — | |
domaincasting-advisors-older-invitations.trycloudflare.com | — | |
domaincomplement-parliamentary-chairs-hc.trycloudflare.com | — | |
domaindc-broader-green-norwegian.trycloudflare.com | — | |
domaindiff-beats-belize-chapter.trycloudflare.com | — | |
domainforest-offensive-height-letters.trycloudflare.com | — | |
domainfotos-phillips-princess-baker.trycloudflare.com | — | |
domaininvestigators-boxing-trademark-threatened.trycloudflare.com | — | |
domainlancaster-sean-initial-ru.trycloudflare.com | — | |
domainlcd-add-palace-switching.trycloudflare.com | — | |
domainmedicine-podcasts-halo-expected.trycloudflare.com | — | |
domainmetro-offset-imposed-behind.trycloudflare.com | — | |
domainmortgage-i-concrete-origins.trycloudflare.com | — | |
domainmusicians-implied-less-model.trycloudflare.com | — | |
domainopen-exceptions-cleared-feelings.trycloudflare.com | — | |
domainphones-pichunter-businesses-drop.trycloudflare.com | — | |
domainphoto-auction-visual-gains.trycloudflare.com | — | |
domainpipe-hawaii-monkey-automatic.trycloudflare.com | — | |
domainpub-motorola-viking-charger.trycloudflare.com | — | |
domainrefrigerator-cheers-indicator-ferrari.trycloudflare.com | — | |
domainsanta-reflection-capitol-classifieds.trycloudflare.com | — | |
domainscientific-shown-desperate-ratio.trycloudflare.com | — | |
domainsecurities-variance-vocal-temporal.trycloudflare.com | — | |
domainspa-step-hopkins-islands.trycloudflare.com | — | |
domainspeak-head-somebody-stays.trycloudflare.com | — | |
domainstrain-brighton-focused-kw.trycloudflare.com | — | |
domainsublime-forecasts-pale-scored.trycloudflare.com | — | |
domainsuffering-arnold-satisfaction-prior.trycloudflare.com | — | |
domainuna-idol-ta-missile.trycloudflare.com | — | |
domainviews-ethics-orientation-roommate.trycloudflare.com | — | |
domainwashing-cartridges-watts-flags.trycloudflare.com | — | |
domainwww.sublime-forecasts-pale-scored.trycloudflare.com | — |
Threat ID: 682c992c7960f6956616a50b
Added to database: 5/20/2025, 3:01:00 PM
Last enriched: 6/19/2025, 6:16:55 PM
Last updated: 8/18/2025, 2:31:23 AM
Views: 564
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