{ "type": "Domain", "indicator": "cssc8.com", "general": { "sections": [ "general", "geo", "url_list", "passive_dns", "malware", "whois", "http_scans" ], "whois": "http://whois.domaintools.com/cssc8.com", "alexa": "http://www.alexa.com/siteinfo/cssc8.com", "indicator": "cssc8.com", "type": "domain", "type_title": "Domain", "validation": [], "base_indicator": { "id": 4212065609, "indicator": "cssc8.com", "type": "domain", "title": "", "description": "", "content": "", "access_type": "public", "access_reason": "" }, "pulse_info": { "count": 1, "pulses": [ { "id": "6992bae83a5988dff8311490", "name": "Distributed Credential Exhaustion & C2 Orchestration via Golang-Based StealthWorker (ELF.Agent-VW)", "description": "Researcher credit: msudosos, level blue platform----\nThis artifact represents a high-integrity StealthWorker (GoBrut) botnet agent, architected as a statically linked, stripped 32-bit ELF binary to ensure cross-platform environmental independence. The sample utilizes XOR 0x20-encoded JavaScript payloads and String.fromCharCode obfuscation to mask its internal logic and bypass heuristic-based memory scanners. [User Notes] Its operational core is a multi-threaded service bruter targeting SSH, MySQL, and CMS backends, leveraging a massive infrastructure of 1,834 domains and 797 unique IPv4 endpoints for decentralized Command & Control (C2). Network telemetry confirms the use of ICMP and HTTP-based beaconing, indicating a sophisticated retry logic designed to maintain persistence across diverse network topologies. With a malicious file score of 10, this binary serves as a primary vector for large-scale credential harvesting and the subsequent integration of Linux infrastructure into global botnet clusters.", "modified": "2026-04-24T13:20:48.450000", "created": "2026-02-16T06:36:24.788000", "tags": [ "Obfuscation: XOR-based String Encryption (0x20)", "T1110.001 (Brute Force: Password Guessing)", "Primary Hash (SHA256): cd3989830da99a69380901769fd78902efb3cd8ba", "MD5 Hash: f8add7e7161460ea2b1970cf4ca535bf", "#PotentialUS-Origin_FalseFlag_Obfuscation" ], "references": [ "Primary Hash (SHA256): cd3989830da99a69380901769fd78902efb3cd8ba5c9390e94bd4333b7fad186", "Obfuscation: XOR-based String Encryption (0x20)", "T1110.001 (Brute Force: Password Guessing)", "This ELF 32-bit LSB artifact is a sophisticated GoBrut/StealthWorker agent, compiled via Golang 1.10 and stripped to obfuscate its high-velocity service-bruting logic. VirusTotal confirms a critical threat profile with 44/65 security vendors flagging the file, which leverages a unique Go BuildID (nGYES3pajdOm...) and a Telfhash (t1f303a0...) for architectural fingerprinting. The binary orchestrates decentralized Command and Control (C2) through an expansive infrastructure of 797 unique IPs and 1,834 domains", "Pivot-Ready Indicators (IOCs) Go BuildID: nGYES3pajdOmKy1i6Ghh/KO9ydOtZpXtoKtB0KHE-/iisNoniHgTbj_cV6M-uk/XmMYzkBiZs8NXMRZYTiT Telfhash: t1f303a0b3055d54e8b7f08907c7af7624cef6e0f726d078f169e278d09a72c826626874 Imphash: 9698f46495ce9401c8bcaf9a2afe1598 Vhash: 1e53f1a1b59ecb93f821c74b25d81e9f", "Researcher msudosos posits a strategic exploitation of Root Certificate Validation Failures, where the adversary leverages an expired trust chain to bypass heuristic security filters and establish persistence.", "his technique allows the GoBrut/StealthWorker agent to circumvent automated revocation checks, enabling its decentralized C2 infrastructure to recruit Linux hosts via high-velocity credential exhaustion.", "The local environment exhibits advanced telemetry suppression within specialized skim memory regions, effectively neutralizing standard DMARC validation and Microsoft-integrated defensive protocols.", "By maintaining a hollowed root posture, the sample facilitates persistent, low-signal synchronization with external cloud infrastructure while bypassing traditional heuristic trust-chain verification.", "The domain prioritywirreles.com (registered via NAMECHEAP INC) shows a 4/93 detection ratio, confirming it is a live but \"low-noise\" C2 node used to avoid broad-spectrum blacklisting", "", "The environment leverages prioritywirreles.com as a high-fidelity DGA-derived C2 node, utilizing its historical resolution to Russian-hosted IP space (194.61.24.231) to maintain persistent Stealthworker botnet synchronization.", "By operating through WhoisGuard-protected infrastructure and exploiting XOR 0x20 obfuscation, the adversary effectively suppresses telemetry into skim space, successfully bypassing DMARC and Microsoft-integrated trust-chain validation.", "The pivot from cd398983... to this domain confirms a multi-year campaign (2019\u20132023) utilizing Namecheap-registered infrastructure to orchestrate wide-scale T1110.001 brute-force operations while bypassing standard PKI expiration checks.", "LBresearcher: msudosos notes: The campaign's use of T1110.001 (Password Guessing) is specifically tuned to exhaust credentials across SSH, MySQL, and CMS backends, effectively recruiting server infrastructure into a global \"zombie\" network.", "LBresearcher: msudosos notes: The threat actor maintains operational longevity by rotating through WhoisGuard-protected nodes like prioritywirreles.com, which historically resolved to Russian-hosted IP space (194.61.24.231) to obfuscate its origin.", "LBresearcher: msudosos notes: By exploiting Root Certificate Validation Failures, the StealthWorker (GoBrut) agent ensures that its 32-bit ELF binaries bypass the automated reputation checks enforced by major cloud providers.", "Monitor DGA Shifts: Track new domains registered through NAMECHEAP INC using the current WhoisGuard patterns to identify the next cluster before it goes active. Analyze Telfhash Clusters: Use the Telfhash (t1f303a0...) to pivot and find if the adversary has updated to 64-bit ELF or ARM architectures. Harden DMARC: Ensure your environment moves from \"p=none\" to \"p=reject\" to mitigate the internal spoofing loops exploited by this botnet's telemetry suppression.", "Persistent C2 Orchestration: This ELF:Agent-VW variant serves as a critical GoBrut node, utilizing XOR 0x20 obfuscation and ICMP/HTTP beaconing to maintain a persistent link across 1,834 domains and 797 unique IPs", "Researcher msudosos: This activity appears to facilitate a preliminary reconnaissance phase, possibly utilizing system commands to query /proc/cpuinfo and /proc/version for architectural profiling purposes.", "Researcher msudosos suggests the VirusTotal (Tencent HABO) behavior report may indicate a potential execution path from volatile storage at /tmp/EB93A6/996E.elf.", "Msudosos Regional Notes: While historical pivots show Russian-hosted nodes, the current dual-origin telemetry\u2014dominated by 181 United States-based endpoints\u2014strongly suggests a domestic-aligned adversary leveraging global 'grey space' to obfuscate its operational core. This massive US-centric footprint (exceeding all other regions combined) reinforces the theory of a false-flag orchestration designed to divert attribution toward foreign infrastructure while abusing legitimate Western-hosted trust chains.", "WHOIS data anchors administrative and technical operations for prioritywirreles.com in Los Angeles, CA (90064) via Namecheap infrastructure. Following its 2020 expiration, the domain has transitioned into redemptionPeriod/pendingDelete status, signaling the formal decommissioning of this C2 asset." ], "public": 1, "adversary": "StealthWorker/GoBrut (The adversary demonstrates advanced telemetry suppression within specialized s", "targeted_countries": [], "malware_families": [ { "id": "Malware Family: StealthWorker / GoBrut", "display_name": "Malware Family: StealthWorker / GoBrut", "target": "/malware/Malware Family: StealthWorker / GoBrut" }, { "id": "MD5 Hash: f8add7e7161460ea2b1970cf4ca535bf", "display_name": "MD5 Hash: f8add7e7161460ea2b1970cf4ca535bf", "target": null } ], "attack_ids": [ { "id": "T1001", "name": "Data Obfuscation", "display_name": "T1001 - Data Obfuscation" } ], "industries": [], "TLP": "green", "cloned_from": null, "export_count": 5, "upvotes_count": 0, "downvotes_count": 0, "votes_count": 0, "locked": false, "pulse_source": "web", "validator_count": 0, "comment_count": 0, "follower_count": 0, "vote": 0, "author": { "username": "msudosos", "id": "381696", "avatar_url": "https://otx.alienvault.com/assets/images/default-avatar.png", "is_subscribed": false, "is_following": false }, "indicator_type_counts": { "FileHash-MD5": 2166, "FileHash-SHA1": 2067, "FileHash-SHA256": 3371, "domain": 13295, "URL": 6860, "email": 272, "hostname": 4705, "SSLCertFingerprint": 268, "CVE": 108, "CIDR": 6 }, "indicator_count": 33118, "is_author": false, "is_subscribing": null, "subscriber_count": 82, "modified_text": "36 days ago ", "is_modified": true, "groups": [], "in_group": false, "threat_hunter_scannable": true, "threat_hunter_has_agents": 1, "related_indicator_type": "domain", "related_indicator_is_active": 1 } ], "references": [ "", "WHOIS data anchors administrative and technical operations for prioritywirreles.com in Los Angeles, CA (90064) via Namecheap infrastructure. Following its 2020 expiration, the domain has transitioned into redemptionPeriod/pendingDelete status, signaling the formal decommissioning of this C2 asset.", "Researcher msudosos: This activity appears to facilitate a preliminary reconnaissance phase, possibly utilizing system commands to query /proc/cpuinfo and /proc/version for architectural profiling purposes.", "The pivot from cd398983... to this domain confirms a multi-year campaign (2019\u20132023) utilizing Namecheap-registered infrastructure to orchestrate wide-scale T1110.001 brute-force operations while bypassing standard PKI expiration checks.", "his technique allows the GoBrut/StealthWorker agent to circumvent automated revocation checks, enabling its decentralized C2 infrastructure to recruit Linux hosts via high-velocity credential exhaustion.", "Obfuscation: XOR-based String Encryption (0x20)", "LBresearcher: msudosos notes: The campaign's use of T1110.001 (Password Guessing) is specifically tuned to exhaust credentials across SSH, MySQL, and CMS backends, effectively recruiting server infrastructure into a global \"zombie\" network.", "Researcher msudosos posits a strategic exploitation of Root Certificate Validation Failures, where the adversary leverages an expired trust chain to bypass heuristic security filters and establish persistence.", "This ELF 32-bit LSB artifact is a sophisticated GoBrut/StealthWorker agent, compiled via Golang 1.10 and stripped to obfuscate its high-velocity service-bruting logic. VirusTotal confirms a critical threat profile with 44/65 security vendors flagging the file, which leverages a unique Go BuildID (nGYES3pajdOm...) and a Telfhash (t1f303a0...) for architectural fingerprinting. The binary orchestrates decentralized Command and Control (C2) through an expansive infrastructure of 797 unique IPs and 1,834 domains", "Msudosos Regional Notes: While historical pivots show Russian-hosted nodes, the current dual-origin telemetry\u2014dominated by 181 United States-based endpoints\u2014strongly suggests a domestic-aligned adversary leveraging global 'grey space' to obfuscate its operational core. This massive US-centric footprint (exceeding all other regions combined) reinforces the theory of a false-flag orchestration designed to divert attribution toward foreign infrastructure while abusing legitimate Western-hosted trust chains.", "By operating through WhoisGuard-protected infrastructure and exploiting XOR 0x20 obfuscation, the adversary effectively suppresses telemetry into skim space, successfully bypassing DMARC and Microsoft-integrated trust-chain validation.", "LBresearcher: msudosos notes: By exploiting Root Certificate Validation Failures, the StealthWorker (GoBrut) agent ensures that its 32-bit ELF binaries bypass the automated reputation checks enforced by major cloud providers.", "The environment leverages prioritywirreles.com as a high-fidelity DGA-derived C2 node, utilizing its historical resolution to Russian-hosted IP space (194.61.24.231) to maintain persistent Stealthworker botnet synchronization.", "Primary Hash (SHA256): cd3989830da99a69380901769fd78902efb3cd8ba5c9390e94bd4333b7fad186", "Pivot-Ready Indicators (IOCs) Go BuildID: nGYES3pajdOmKy1i6Ghh/KO9ydOtZpXtoKtB0KHE-/iisNoniHgTbj_cV6M-uk/XmMYzkBiZs8NXMRZYTiT Telfhash: t1f303a0b3055d54e8b7f08907c7af7624cef6e0f726d078f169e278d09a72c826626874 Imphash: 9698f46495ce9401c8bcaf9a2afe1598 Vhash: 1e53f1a1b59ecb93f821c74b25d81e9f", "Monitor DGA Shifts: Track new domains registered through NAMECHEAP INC using the current WhoisGuard patterns to identify the next cluster before it goes active. Analyze Telfhash Clusters: Use the Telfhash (t1f303a0...) to pivot and find if the adversary has updated to 64-bit ELF or ARM architectures. Harden DMARC: Ensure your environment moves from \"p=none\" to \"p=reject\" to mitigate the internal spoofing loops exploited by this botnet's telemetry suppression.", "LBresearcher: msudosos notes: The threat actor maintains operational longevity by rotating through WhoisGuard-protected nodes like prioritywirreles.com, which historically resolved to Russian-hosted IP space (194.61.24.231) to obfuscate its origin.", "T1110.001 (Brute Force: Password Guessing)", "By maintaining a hollowed root posture, the sample facilitates persistent, low-signal synchronization with external cloud infrastructure while bypassing traditional heuristic trust-chain verification.", "Persistent C2 Orchestration: This ELF:Agent-VW variant serves as a critical GoBrut node, utilizing XOR 0x20 obfuscation and ICMP/HTTP beaconing to maintain a persistent link across 1,834 domains and 797 unique IPs", "Researcher msudosos suggests the VirusTotal (Tencent HABO) behavior report may indicate a potential execution path from volatile storage at /tmp/EB93A6/996E.elf.", "The local environment exhibits advanced telemetry suppression within specialized skim memory regions, effectively neutralizing standard DMARC validation and Microsoft-integrated defensive protocols.", "The domain prioritywirreles.com (registered via NAMECHEAP INC) shows a 4/93 detection ratio, confirming it is a live but \"low-noise\" C2 node used to avoid broad-spectrum blacklisting" ], "related": { "alienvault": { "adversary": [], "malware_families": [], "industries": [] }, "other": { "adversary": [ "StealthWorker/GoBrut (The adversary demonstrates advanced telemetry suppression within specialized s" ], "malware_families": [ "Md5 hash: f8add7e7161460ea2b1970cf4ca535bf", "Malware family: stealthworker / gobrut" ], "industries": [] } } }, "false_positive": [] }, "geo": {}, "geo_ipapicom": {}, "pulse_count": 1, "pulses": [ { "id": "6992bae83a5988dff8311490", "name": "Distributed Credential Exhaustion & C2 Orchestration via Golang-Based StealthWorker (ELF.Agent-VW)", "description": "Researcher credit: msudosos, level blue platform----\nThis artifact represents a high-integrity StealthWorker (GoBrut) botnet agent, architected as a statically linked, stripped 32-bit ELF binary to ensure cross-platform environmental independence. The sample utilizes XOR 0x20-encoded JavaScript payloads and String.fromCharCode obfuscation to mask its internal logic and bypass heuristic-based memory scanners. [User Notes] Its operational core is a multi-threaded service bruter targeting SSH, MySQL, and CMS backends, leveraging a massive infrastructure of 1,834 domains and 797 unique IPv4 endpoints for decentralized Command & Control (C2). Network telemetry confirms the use of ICMP and HTTP-based beaconing, indicating a sophisticated retry logic designed to maintain persistence across diverse network topologies. With a malicious file score of 10, this binary serves as a primary vector for large-scale credential harvesting and the subsequent integration of Linux infrastructure into global botnet clusters.", "modified": "2026-04-24T13:20:48.450000", "created": "2026-02-16T06:36:24.788000", "tags": [ "Obfuscation: XOR-based String Encryption (0x20)", "T1110.001 (Brute Force: Password Guessing)", "Primary Hash (SHA256): cd3989830da99a69380901769fd78902efb3cd8ba", "MD5 Hash: f8add7e7161460ea2b1970cf4ca535bf", "#PotentialUS-Origin_FalseFlag_Obfuscation" ], "references": [ "Primary Hash (SHA256): cd3989830da99a69380901769fd78902efb3cd8ba5c9390e94bd4333b7fad186", "Obfuscation: XOR-based String Encryption (0x20)", "T1110.001 (Brute Force: Password Guessing)", "This ELF 32-bit LSB artifact is a sophisticated GoBrut/StealthWorker agent, compiled via Golang 1.10 and stripped to obfuscate its high-velocity service-bruting logic. VirusTotal confirms a critical threat profile with 44/65 security vendors flagging the file, which leverages a unique Go BuildID (nGYES3pajdOm...) and a Telfhash (t1f303a0...) for architectural fingerprinting. The binary orchestrates decentralized Command and Control (C2) through an expansive infrastructure of 797 unique IPs and 1,834 domains", "Pivot-Ready Indicators (IOCs) Go BuildID: nGYES3pajdOmKy1i6Ghh/KO9ydOtZpXtoKtB0KHE-/iisNoniHgTbj_cV6M-uk/XmMYzkBiZs8NXMRZYTiT Telfhash: t1f303a0b3055d54e8b7f08907c7af7624cef6e0f726d078f169e278d09a72c826626874 Imphash: 9698f46495ce9401c8bcaf9a2afe1598 Vhash: 1e53f1a1b59ecb93f821c74b25d81e9f", "Researcher msudosos posits a strategic exploitation of Root Certificate Validation Failures, where the adversary leverages an expired trust chain to bypass heuristic security filters and establish persistence.", "his technique allows the GoBrut/StealthWorker agent to circumvent automated revocation checks, enabling its decentralized C2 infrastructure to recruit Linux hosts via high-velocity credential exhaustion.", "The local environment exhibits advanced telemetry suppression within specialized skim memory regions, effectively neutralizing standard DMARC validation and Microsoft-integrated defensive protocols.", "By maintaining a hollowed root posture, the sample facilitates persistent, low-signal synchronization with external cloud infrastructure while bypassing traditional heuristic trust-chain verification.", "The domain prioritywirreles.com (registered via NAMECHEAP INC) shows a 4/93 detection ratio, confirming it is a live but \"low-noise\" C2 node used to avoid broad-spectrum blacklisting", "", "The environment leverages prioritywirreles.com as a high-fidelity DGA-derived C2 node, utilizing its historical resolution to Russian-hosted IP space (194.61.24.231) to maintain persistent Stealthworker botnet synchronization.", "By operating through WhoisGuard-protected infrastructure and exploiting XOR 0x20 obfuscation, the adversary effectively suppresses telemetry into skim space, successfully bypassing DMARC and Microsoft-integrated trust-chain validation.", "The pivot from cd398983... to this domain confirms a multi-year campaign (2019\u20132023) utilizing Namecheap-registered infrastructure to orchestrate wide-scale T1110.001 brute-force operations while bypassing standard PKI expiration checks.", "LBresearcher: msudosos notes: The campaign's use of T1110.001 (Password Guessing) is specifically tuned to exhaust credentials across SSH, MySQL, and CMS backends, effectively recruiting server infrastructure into a global \"zombie\" network.", "LBresearcher: msudosos notes: The threat actor maintains operational longevity by rotating through WhoisGuard-protected nodes like prioritywirreles.com, which historically resolved to Russian-hosted IP space (194.61.24.231) to obfuscate its origin.", "LBresearcher: msudosos notes: By exploiting Root Certificate Validation Failures, the StealthWorker (GoBrut) agent ensures that its 32-bit ELF binaries bypass the automated reputation checks enforced by major cloud providers.", "Monitor DGA Shifts: Track new domains registered through NAMECHEAP INC using the current WhoisGuard patterns to identify the next cluster before it goes active. Analyze Telfhash Clusters: Use the Telfhash (t1f303a0...) to pivot and find if the adversary has updated to 64-bit ELF or ARM architectures. Harden DMARC: Ensure your environment moves from \"p=none\" to \"p=reject\" to mitigate the internal spoofing loops exploited by this botnet's telemetry suppression.", "Persistent C2 Orchestration: This ELF:Agent-VW variant serves as a critical GoBrut node, utilizing XOR 0x20 obfuscation and ICMP/HTTP beaconing to maintain a persistent link across 1,834 domains and 797 unique IPs", "Researcher msudosos: This activity appears to facilitate a preliminary reconnaissance phase, possibly utilizing system commands to query /proc/cpuinfo and /proc/version for architectural profiling purposes.", "Researcher msudosos suggests the VirusTotal (Tencent HABO) behavior report may indicate a potential execution path from volatile storage at /tmp/EB93A6/996E.elf.", "Msudosos Regional Notes: While historical pivots show Russian-hosted nodes, the current dual-origin telemetry\u2014dominated by 181 United States-based endpoints\u2014strongly suggests a domestic-aligned adversary leveraging global 'grey space' to obfuscate its operational core. This massive US-centric footprint (exceeding all other regions combined) reinforces the theory of a false-flag orchestration designed to divert attribution toward foreign infrastructure while abusing legitimate Western-hosted trust chains.", "WHOIS data anchors administrative and technical operations for prioritywirreles.com in Los Angeles, CA (90064) via Namecheap infrastructure. Following its 2020 expiration, the domain has transitioned into redemptionPeriod/pendingDelete status, signaling the formal decommissioning of this C2 asset." ], "public": 1, "adversary": "StealthWorker/GoBrut (The adversary demonstrates advanced telemetry suppression within specialized s", "targeted_countries": [], "malware_families": [ { "id": "Malware Family: StealthWorker / GoBrut", "display_name": "Malware Family: StealthWorker / GoBrut", "target": "/malware/Malware Family: StealthWorker / GoBrut" }, { "id": "MD5 Hash: f8add7e7161460ea2b1970cf4ca535bf", "display_name": "MD5 Hash: f8add7e7161460ea2b1970cf4ca535bf", "target": null } ], "attack_ids": [ { "id": "T1001", "name": "Data Obfuscation", "display_name": "T1001 - Data Obfuscation" } ], "industries": [], "TLP": "green", "cloned_from": null, "export_count": 5, "upvotes_count": 0, "downvotes_count": 0, "votes_count": 0, "locked": false, "pulse_source": "web", "validator_count": 0, "comment_count": 0, "follower_count": 0, "vote": 0, "author": { "username": "msudosos", "id": "381696", "avatar_url": "https://otx.alienvault.com/assets/images/default-avatar.png", "is_subscribed": false, "is_following": false }, "indicator_type_counts": { "FileHash-MD5": 2166, "FileHash-SHA1": 2067, "FileHash-SHA256": 3371, "domain": 13295, "URL": 6860, "email": 272, "hostname": 4705, "SSLCertFingerprint": 268, "CVE": 108, "CIDR": 6 }, "indicator_count": 33118, "is_author": false, "is_subscribing": null, "subscriber_count": 82, "modified_text": "36 days ago ", "is_modified": true, "groups": [], "in_group": false, "threat_hunter_scannable": true, "threat_hunter_has_agents": 1, "related_indicator_type": "domain", "related_indicator_is_active": 1 } ], "error": null, "vt": { "error": "VirusTotal rate limit reached. Try again shortly.", "indicator": "cssc8.com", "type": "Domain" }, "abuseipdb": null, "urlhaus": { "indicator": "cssc8.com", "found": false, "verdict": "clean", "urls": [], "error": null }, "from_cache": true, "_cached_at": 1780222416.6968765 }