{"id":38841,"date":"2019-10-31T22:26:17","date_gmt":"2019-10-31T19:26:17","guid":{"rendered":"https:\/\/prohoster.info\/blog\/passive-dns-v-rukah-analitika\/"},"modified":"2019-10-31T22:26:17","modified_gmt":"2019-10-31T19:26:17","slug":"passive-dns-v-rukah-analitika","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/administrirovanie\/passive-dns-v-rukah-analitika","title":{"rendered":"Passive DNS nelle mani dell'analista","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Il sistema dei nomi di dominio (DNS) \u00e8 simile a una rubrica telefonica, che traduce nomi user-friendly come \"ussc.ru\" in indirizzi IP. Poich\u00e9 l'attivit\u00e0 DNS \u00e8 presente praticamente in tutte le sessioni di comunicazione, indipendentemente dal protocollo. Pertanto, il logging DNS \u00e8 una fonte di dati preziosa per il professionista della sicurezza informatica, consentendo di rilevare anomalie o ottenere ulteriori informazioni sul sistema esaminato.<\/p>\n<p><\/p>\n<p>Nel 2004, Florian Weimer propose un metodo di logging chiamato Passive DNS, che consente di ricostruire la cronologia delle modifiche ai dati DNS con la possibilit\u00e0 di indicizzazione e ricerca, che possono fornire accesso ai seguenti dati:<\/p>\n<p><\/p>\n<ul>\n<li>Nome di dominio<\/li>\n<li>Indirizzo IP del nome di dominio richiesto<\/li>\n<li>Data e ora della risposta<\/li>\n<li>Tipo di risposta<\/li>\n<li>ecc.<\/li>\n<\/ul>\n<p><\/p>\n<p>I dati per il Passive DNS vengono raccolti dai server DNS ricursivi tramite moduli integrati o intercettando le risposte dai server DNS responsabili della zona.<\/p>\n<p>\n<img decoding=\"async\" alt=\"Passive DNS nelle mani dell&#039;analista\" src=\"\/wp-content\/uploads\/2019\/10\/03066b8baf19d86c73bb7a1ca240a26c.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Figura 1. Passive DNS (prelevata da <noindex><a rel=\"nofollow\" href=\"https:\/\/ctovision.com\/passivedns-leverage-research\/\">Ctovision.com<\/a><\/noindex>)<\/i><\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>La caratteristica del Passive DNS \u00e8 che non \u00e8 necessario registrare l'indirizzo IP del cliente, il che consente di proteggere la privacy degli utenti. <\/p>\n<p><\/p>\n<p>Attualmente esistono molti servizi che forniscono accesso ai dati Passive DNS:<\/p>\n<p><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/www.dnsdb.info\/\">DNSDB<\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/www.virustotal.com\/gui\/home\/upload\">VirusTotal<\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/www.riskiq.com\/products\/passivetotal\/\">PassiveTotal<\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/octo.safedns.com\/\">Octopus<\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/securitytrails.com\/\">SecurityTrails<\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/umbrella.cisco.com\/products\/threat-intelligence\">Umbrella Investigate<\/a><\/noindex><\/p>\n<p><b>Azienda<\/b><br \/>\nFarsight Security<br \/>\nVirusTotal<br \/>\nRiskiq<br \/>\nSafeDNS<br \/>\nSecurityTrails<br \/>\nCisco<\/p>\n<p><b>Accesso<\/b><br \/>\nSu richiesta<br \/>\nNon richiede registrazione<br \/>\nRegistrazione aperta<br \/>\nSu richiesta<br \/>\nNon richiede registrazione<br \/>\nSu richiesta<\/p>\n<p><b>API<\/b><br \/>\nPresente<br \/>\nPresente<br \/>\nPresente<br \/>\nPresente<br \/>\nPresente<br \/>\nPresente<\/p>\n<p><b>Disponibilit\u00e0 del cliente<\/b><br \/>\nPresente<br \/>\nPresente<br \/>\nPresente<br \/>\nAssente<br \/>\nAssente<br \/>\nAssente<\/p>\n<p><b>Inizio raccolta dati<\/b><br \/>\n2010<br \/>\n2013<br \/>\n2009<br \/>\nMostra solo gli ultimi 3 mesi<br \/>\n2008<br \/>\n2006<\/p>\n<p><\/p>\n<p><i>Tabella 1. Servizi con accesso ai dati Passive DNS<\/i><\/p>\n<p><\/p>\n<h4>Opzioni per l'uso del Passive DNS<\/h4>\n<p><\/p>\n<p>Utilizzando il Passive DNS \u00e8 possibile costruire relazioni tra nomi di dominio, server NS e indirizzi IP. Questo consente di creare mappe dei sistemi analizzati e monitorare le modifiche a tale mappa dal primo rilevamento fino al momento attuale.<\/p>\n<p><\/p>\n<p>Inoltre, il Passive DNS facilita l'identificazione delle anomalie nel traffico. Ad esempio, il monitoraggio delle modifiche nelle zone NS e dei record di tipo A e AAAA consente di rilevare siti web dannosi che utilizzano il metodo fast flux, concepito per nascondere i C&amp;C dalla rilevazione e dal blocco. Poich\u00e9 i nomi di dominio legittimi (a parte quelli utilizzati per il bilanciamento del carico) non cambiano spesso i loro indirizzi IP, e la maggior parte delle zone legittime cambia raramente i propri server NS. <\/p>\n<p><\/p>\n<p>A differenza della semplice enumerazione dei sottodomini tramite dizionari, il Passive DNS consente di trovare anche i nomi di dominio pi\u00f9 esotici, come ad esempio \u201c222qmxacaiqaaaaazibq4aaidhmbqaaa0undefined7140c0.p.hoff.ru\u201d. Inoltre, questo pu\u00f2 a volte rivelare aree di test (e vulnerabili) del sito web, materiali per sviluppatori, ecc. <\/p>\n<p><\/p>\n<h4>Indagine sul link contenuto nell'e-mail, utilizzando il Passive DNS<\/h4>\n<p><\/p>\n<p>Attualmente, lo spam \u00e8 uno dei principali modi in cui un attaccante penetra nel computer della vittima o ruba informazioni riservate. Cerchiamo di investigare il link di una di queste e-mail, utilizzando il Passive DNS, per valutare l'efficacia di questo metodo.<\/p>\n<p>\n<img decoding=\"async\" alt=\"Passive DNS nelle mani dell&#039;analista\" src=\"\/wp-content\/uploads\/2019\/10\/47d75ca464d6aa1c803670b1a53b4cf8.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Figura 2. E-mail di spam<\/i><\/p>\n<p><\/p>\n<p>Il link in questa email portava al sito magnit-boss.rocks, che offriva di raccogliere bonus e ricevere denaro in modalit\u00e0 automatica:<\/p>\n<p>\n<img decoding=\"async\" alt=\"Passive DNS nelle mani dell&#039;analista\" src=\"\/wp-content\/uploads\/2019\/10\/f9bbb7d49579e5559c8fc76af0cfc13d.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Figura 3. Pagina ospitata sul dominio magnit-boss.rocks<\/i><\/p>\n<p><\/p>\n<p>Per analizzare questo sito \u00e8 stato utilizzato <noindex><a rel=\"nofollow\" href=\"http:\/\/api.passivetotal.org\/api\/docs\/\">API Riskiq<\/a><\/noindex>, che conta gi\u00e0 3 clienti attivi su <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/passivetotal\/python_api\">Python<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/chrislee35\/passivetotal\">Ruby<\/a><\/noindex> e <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/passivetotal\/rust_api\">Rust<\/a><\/noindex>. <\/p>\n<p><\/p>\n<p>Per prima cosa scopriremo la storia di questo nome di dominio, per fare ci\u00f2 utilizzeremo il comando:<\/p>\n<p><\/p>\n<p><i>pt-client pdns \u2014query magnit-boss.rocks<\/i><\/p>\n<p><\/p>\n<p>Questo comando fornir\u00e0 informazioni su tutte le risoluzioni DNS associate a questo nome di dominio. <\/p>\n<p>\n<img decoding=\"async\" alt=\"Passive DNS nelle mani dell&#039;analista\" src=\"\/wp-content\/uploads\/2019\/10\/bfaa82b2d7a753f684f32a93e29bf679.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Figura 4. Risposta dall'API Riskiq<\/i><\/p>\n<p><\/p>\n<p>Presentiamo la risposta dell'API in una forma pi\u00f9 chiara: <\/p>\n<p>\n<img decoding=\"async\" alt=\"Passive DNS nelle mani dell&#039;analista\" src=\"\/wp-content\/uploads\/2019\/10\/90bcff91f110ee8e8f97151618548cb3.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Figura 5. Tutti i record dalla risposta<\/i><\/p>\n<p><\/p>\n<p>Per ulteriori indagini sono stati presi in considerazione gli indirizzi IP a cui questo nome di dominio era risolto al momento della ricezione della email del 01.08.2019, tra cui gli indirizzi 92.119.113.112 e 85.143.219.65. <\/p>\n<p><\/p>\n<p>Utilizzando il comando: <\/p>\n<p><\/p>\n<p><i>pt-client pdns \u2014query<\/i><\/p>\n<p><\/p>\n<p>\u00e8 possibile ottenere tutti i nomi di dominio associati a questi indirizzi IP.<br \/>\nL'indirizzo IP 92.119.113.112 ha 42 nomi di dominio unici che si sono risolti in questo indirizzo IP, tra cui i seguenti nomi:<\/p>\n<p><\/p>\n<ul>\n<li>magnit-boss.club<\/li>\n<li>igrovie-avtomaty.me<\/li>\n<li>pro-x-audit.xyz<\/li>\n<li>zep3-www.xyz<\/li>\n<li>e altro ancora.<\/li>\n<\/ul>\n<p><\/p>\n<p>L'indirizzo IP 85.143.219.65 ha 44 nomi di dominio unici che si sono risolti in questo IP, tra cui ci sono i seguenti nomi:<\/p>\n<p><\/p>\n<ul>\n<li>cvv2.name (sito per la vendita di dati di carte di credito)<\/li>\n<li>emaills.world<\/li>\n<li>www.mailru.space<\/li>\n<li>e altro ancora.<\/li>\n<\/ul>\n<p><\/p>\n<p>I collegamenti con questi nomi di dominio suggeriscono attivit\u00e0 di phishing, ma crediamo nella bont\u00e0 delle persone, quindi cerchiamo di ottenere un bonus di 332 501,72 rubli? Dopo aver cliccato sul pulsante \u201cS\u00cc\u201d, il sito ci chiede di trasferire 300 rubli da una carta per sbloccare l'account e ci rimanda al sito as-torpay.info per inserire i dati. <\/p>\n<p>\n<img decoding=\"async\" alt=\"Passive DNS nelle mani dell&#039;analista\" src=\"\/wp-content\/uploads\/2019\/10\/cb2525f6438e5b0314949eae1ab3b81b.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Figura 6. Pagina principale del sito ac-pay2day.net<\/i><\/p>\n<p><\/p>\n<p>A prima vista il sito sembra legittimo, ha un certificato https, e la pagina principale offre di collegare questo sistema di pagamento al proprio sito, ma purtroppo tutti i link per il collegamento non funzionano. Questo nome di dominio si risolve solo in un IP\u2014190.115.19.74. Questo, a sua volta, ha 1475 nomi di dominio unici che si sono risolti in questo IP, tra cui i seguenti nomi:<\/p>\n<p><\/p>\n<ul>\n<li>ac-pay2day.net<\/li>\n<li>ac-payfit.com<\/li>\n<li>as-manypay.com<\/li>\n<li>fletkass.net<\/li>\n<li>as-magicpay.com<\/li>\n<li>e altro ancora.<\/li>\n<\/ul>\n<p><\/p>\n<p>Come possiamo vedere, il Passive DNS consente di raccogliere rapidamente ed efficacemente i dati sulla risorsa in esame e persino di creare una sorta di impronta che permette di svelare un intero schema di furto di dati personali, dalla loro acquisizione fino al probabile luogo di vendita. <\/p>\n<p>\n<img decoding=\"async\" alt=\"Passive DNS nelle mani dell&#039;analista\" src=\"\/wp-content\/uploads\/2019\/10\/e06af58c18cdd52e4790047c46768470.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Figura 7. Mappa del sistema analizzato<\/i><\/p>\n<p><\/p>\n<p>Non \u00e8 tutto roseo come vorremmo. Ad esempio, tali indagini possono facilmente incontrare ostacoli come CloudFlare o servizi simili. L'efficacia della base di dati raccolta dipende molto dal numero di richieste DNS che passano attraverso il modulo per la raccolta dei dati Passive DNS. Tuttavia, il Passive DNS resta una fonte di informazioni aggiuntive per il ricercatore.<\/p>\n<p><\/p>\n<p><em>Autore: Specialista del Centro Uralico per i Sistemi di Sicurezza<\/em><\/p>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/470974\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u0438\u0441\u0442\u0435\u043c\u0430 \u0434\u043e\u043c\u0435\u043d\u043d\u044b\u0445 \u0438\u043c\u0435\u043d (DNS) \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434\u043e\u0431\u0438\u0435\u043c \u0442\u0435\u043b\u0435\u0444\u043e\u043d\u043d\u043e\u0439 \u043a\u043d\u0438\u0433\u0438, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u0435\u0440\u0435\u0432\u043e\u0434\u0438\u0442 \u0443\u0434\u043e\u0431\u043d\u044b\u0435 \u0434\u043b\u044f \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u0438\u043c\u0435\u043d\u0430, 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