More than 100 DDoS botnets built from Linux malware for embedded devices

Default and hard-coded credentials have led to the compromise of IoT devices

LizardStresser, the DDoS malware for Linux systems written by the infamous Lizard Squad attacker group, was used over the past year to create over 100 botnets, some built almost exclusively from compromised Internet-of-Things devices.

LizardStresser has two components: A client that runs on hacked Linux-based machines and a server used by attackers to control the clients. It can launch several types of distributed denial-of-service (DDoS) attacks, execute shell commands and propagate to other systems over the telnet protocol by trying default or hard-coded credentials.

The code for LizardStresser was published online in early 2015, giving less-skilled attackers an easy way to build new DDoS botnets of their own. The number of unique LizardStresser command-and-control servers has steadily increased since then, especially this year, reaching over 100 by June, according to researchers from DDoS mitigation provider Arbor Networks.

 

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The DDoS bot is very versatile, with versions for the x86 CPU architecture as well as ARM and MIPS, which are commonly used on embedded device.

IoT devices are perfect for DDoS bots, because they run some familiar variant of Linux, have limited resources so they don’t have malware detection or advanced security features and, when they’re connected directly to the Internet, they are typically not subjected to bandwidth limitations or firewall filtering.

The reuse of software and hardware components is very common in the IoT world as it simplifies and lowers the cost of development. Because of this, default credentials that were used to initially manage one device may later make their way into entirely different classes of devices, the Arbor Networks researchers said in a blog post.

IoT botnets can be very powerful. Arbor Networks investigated two of them that were used to launch attacks against banks, telecommunications companies and government organisations from Brazil, as well as three gaming companies from the US

One of the attacks peaked at over 400Gbps and 90% of the hosts from which the malicious traffic originated responded over HTTP with a web-based interface called NETSurveillance WEB.

“Doing some more research, the NETSurveillance WEB interface appears to be generic code used by a variety of Internet-accessible webcams,” the Arbor Networks researchers said. “A default password for the root user is available online, and telnet is enabled by default.”

This is not the first time that IoT botnets have been used to launch DDoS attacks. Researchers from web security firm Sucuri just recently reported DDoS attacks launched from a botnet of over 25,000 CCTV cameras and digital video recorders.

 

 

 

 

IDG News Service

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'string') { return '+1 000 000 0000'; // Default US placeholder } var mockPlaceholders = [ { countryCode: 'US', placeholder: '+1 000 000 0000', helpText: 'Include the US country code +1 before the phone number', }, { countryCode: 'GB', placeholder: '+44 0000 000000', helpText: 'Include the GB country code +44 before the phone number', }, { countryCode: 'CA', placeholder: '+1 000 000 0000', helpText: 'Include the CA country code +1 before the phone number', }, { countryCode: 'AU', placeholder: '+61 000 000 000', helpText: 'Include the AU country code +61 before the phone number', }, { countryCode: 'DE', placeholder: '+49 000 0000000', helpText: 'Fügen Sie vor der Telefonnummer die DE-Ländervorwahl +49 ein', }, { countryCode: 'FR', placeholder: '+33 0 00 00 00 00', helpText: 'Incluez le code pays FR +33 avant le numéro de téléphone', }, { countryCode: 'ES', placeholder: '+34 000 000 000', helpText: 'Incluya el código de país ES +34 antes del número de teléfono', }, { countryCode: 'NL', placeholder: '+31 0 00000000', helpText: 'Voeg de NL-landcode +31 toe vóór het telefoonnummer', }, { countryCode: 'BE', placeholder: '+32 000 00 00 00', helpText: 'Incluez le code pays BE +32 avant le numéro de téléphone', }, { countryCode: 'CH', placeholder: '+41 00 000 00 00', helpText: 'Fügen Sie vor der Telefonnummer die CH-Ländervorwahl +41 ein', }, { countryCode: 'AT', placeholder: '+43 000 000 0000', helpText: 'Fügen Sie vor der Telefonnummer die AT-Ländervorwahl +43 ein', }, { countryCode: 'IE', placeholder: '+353 00 000 0000', helpText: 'Include the IE country code +353 before the phone number', }, { countryCode: 'IT', placeholder: '+39 000 000 0000', helpText: 'Includere il prefisso internazionale IT +39 prima del numero di telefono', }, { countryCode: 'NO', placeholder: '+47 000 00 000', helpText: 'Inkluder NO landskode +47 før telefonnummeret', }, { countryCode: 'SE', placeholder: '+46 00 000 00 00', helpText: 'Inkludera SE landskod +46 före telefonnumret', }, { countryCode: 'DK', placeholder: '+45 00 00 00 00', helpText: 'Inkluder DK landekode +45 før telefonnummeret', }, { countryCode: 'FI', placeholder: '+358 00 000 0000', helpText: 'Sisällytä FI-maakoodi +358 ennen puhelinnumeroa', }, { countryCode: 'EE', placeholder: '+372 0000 0000', helpText: 'Lisage EE riigikood +372 telefoninumbri ette', }, { countryCode: 'PL', placeholder: '+48 000 000 000', helpText: 'Podaj numer kierunkowy PL +48 przed numerem telefonu', }, { countryCode: 'SK', placeholder: '+421 000 000 000', helpText: 'Pred telefónne číslo uveďte kód krajiny SK +421', }, { countryCode: 'LV', placeholder: '+371 0000 0000', helpText: 'Iekļaujiet LV valsts kodu +371 pirms tālruņa numura', }, { countryCode: 'LT', placeholder: '+370 0000 0000', helpText: 'Įtraukite LT šalies kodą +370 prieš telefono numerį', }, { countryCode: 'GR', placeholder: '+30 000 000 0000', helpText: 'Συμπεριλάβετε τον κωδικό χώρας GR +30 πριν από τον αριθμό τηλεφώνου', }, { countryCode: 'PT', placeholder: 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placeholder: '+44 0000 000000', helpText: 'Include the IM country code +44 before the phone number', }, { countryCode: 'GG', placeholder: '+44 0000 000000', helpText: 'Include the GG country code +44 before the phone number', }, { countryCode: 'AL', placeholder: '+355 00 000 0000', helpText: 'Përfshini kodin e vendit AL +355 para numrit të telefonit', }, { countryCode: 'SM', placeholder: '+378 0000 000000', helpText: 'Includere il prefisso internazionale SM +378 prima del numero di telefono', }, { countryCode: 'FO', placeholder: '+298 000000', helpText: 'Inkluder FO landekode +298 før telefonnummeret', }, { countryCode: 'MT', placeholder: '+356 0000 0000', helpText: 'Include the MT country code +356 before the phone number', }, { countryCode: 'LI', placeholder: '+423 000 0000', helpText: 'Fügen Sie vor der Telefonnummer die LI-Ländervorwahl +423 ein', }, { countryCode: 'GI', placeholder: '+350 000 00000', helpText: 'Include the GI country code +350 before the phone number', }, { 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phoneInput.placeholder = placeholder; } } function updateCountryCodeInstruction(countryCode, fieldName) { updatePlaceholder(countryCode, fieldName); } function getDefaultHelpText(countryCode) { var mockPlaceholders = [ { countryCode: 'US', placeholder: '+1 000 000 0000', helpText: 'Include the US country code +1 before the phone number', }, { countryCode: 'GB', placeholder: '+44 0000 000000', helpText: 'Include the GB country code +44 before the phone number', }, { countryCode: 'CA', placeholder: '+1 000 000 0000', helpText: 'Include the CA country code +1 before the phone number', }, { countryCode: 'AU', placeholder: '+61 000 000 000', helpText: 'Include the AU country code +61 before the phone number', }, { countryCode: 'DE', placeholder: '+49 000 0000000', helpText: 'Fügen Sie vor der Telefonnummer die DE-Ländervorwahl +49 ein', }, { countryCode: 'FR', placeholder: '+33 0 00 00 00 00', helpText: 'Incluez le code pays FR +33 avant le numéro de téléphone', }, { countryCode: 'ES', placeholder: '+34 000 000 000', helpText: 'Incluya el código de país ES +34 antes del número de teléfono', }, { countryCode: 'NL', placeholder: '+31 0 00000000', helpText: 'Voeg de NL-landcode +31 toe vóór het telefoonnummer', }, { countryCode: 'BE', placeholder: '+32 000 00 00 00', helpText: 'Incluez le code pays BE +32 avant le numéro de téléphone', }, { countryCode: 'CH', placeholder: '+41 00 000 00 00', helpText: 'Fügen Sie vor der Telefonnummer die CH-Ländervorwahl +41 ein', }, { countryCode: 'AT', placeholder: '+43 000 000 0000', helpText: 'Fügen Sie vor der Telefonnummer die AT-Ländervorwahl +43 ein', }, { countryCode: 'IE', placeholder: '+353 00 000 0000', helpText: 'Include the IE country code +353 before the phone number', }, { countryCode: 'IT', placeholder: '+39 000 000 0000', helpText: 'Includere il prefisso internazionale IT +39 prima del numero di telefono', }, { countryCode: 'NO', placeholder: '+47 000 00 000', helpText: 'Inkluder NO landskode +47 før telefonnummeret', }, { countryCode: 'SE', placeholder: '+46 00 000 00 00', helpText: 'Inkludera SE landskod +46 före telefonnumret', }, { countryCode: 'DK', placeholder: '+45 00 00 00 00', helpText: 'Inkluder DK landekode +45 før telefonnummeret', }, { countryCode: 'FI', placeholder: '+358 00 000 0000', helpText: 'Sisällytä FI-maakoodi +358 ennen puhelinnumeroa', }, { countryCode: 'EE', placeholder: '+372 0000 0000', helpText: 'Lisage EE riigikood +372 telefoninumbri ette', }, { countryCode: 'PL', placeholder: '+48 000 000 000', helpText: 'Podaj numer kierunkowy PL +48 przed numerem telefonu', }, { countryCode: 'SK', placeholder: '+421 000 000 000', helpText: 'Pred telefónne číslo uveďte kód krajiny SK +421', }, { countryCode: 'LV', placeholder: '+371 0000 0000', helpText: 'Iekļaujiet LV valsts kodu +371 pirms tālruņa numura', }, { countryCode: 'LT', placeholder: '+370 0000 0000', helpText: 'Įtraukite LT šalies kodą +370 prieš telefono numerį', }, { countryCode: 'GR', placeholder: '+30 000 000 0000', helpText: 'Συμπεριλάβετε τον κωδικό χώρας GR +30 πριν από τον αριθμό τηλεφώνου', }, { countryCode: 'PT', placeholder: '+351 000 000 000', helpText: 'Inclua o código de país PT +351 antes do número de telefone', }, { countryCode: 'HR', placeholder: '+385 00 000 0000', helpText: 'Uključite HR pozivni broj države +385 prije telefonskog broja', }, { countryCode: 'SI', placeholder: '+386 00 000 000', helpText: 'Vključite SI kodo države +386 pred telefonsko številko', }, { countryCode: 'IS', placeholder: '+354 000 0000', helpText: 'Láttu IS landsnúmer +354 fylgja á undan símanúmerinu', }, { countryCode: 'LU', placeholder: '+352 000 000 000', helpText: 'Incluez le code pays LU +352 avant le numéro de téléphone', }, { countryCode: 'MC', placeholder: '+377 00 00 00 00', helpText: 'Incluez le code pays MC +377 avant le numéro de téléphone', }, { countryCode: 'AD', placeholder: '+376 000 000', helpText: 'Incloeu el codi de país AD +376 abans del número de telèfon', }, { countryCode: 'JE', placeholder: '+44 0000 000000', helpText: 'Include the JE country code +44 before the phone number', }, { countryCode: 'IM', placeholder: '+44 0000 000000', helpText: 'Include the IM country code +44 before the phone number', }, { countryCode: 'GG', placeholder: '+44 0000 000000', helpText: 'Include the GG country code +44 before the phone number', }, { countryCode: 'AL', placeholder: '+355 00 000 0000', helpText: 'Përfshini kodin e vendit AL +355 para numrit të telefonit', }, { countryCode: 'SM', placeholder: '+378 0000 000000', helpText: 'Includere il prefisso internazionale SM +378 prima del numero di telefono', }, { countryCode: 'FO', placeholder: '+298 000000', helpText: 'Inkluder FO landekode +298 før telefonnummeret', }, { countryCode: 'MT', placeholder: '+356 0000 0000', helpText: 'Include the MT country code +356 before the phone number', }, { countryCode: 'LI', placeholder: '+423 000 0000', helpText: 'Fügen Sie vor der Telefonnummer die LI-Ländervorwahl +423 ein', }, { countryCode: 'GI', placeholder: '+350 000 00000', helpText: 'Include the GI country code +350 before the phone number', }, { countryCode: 'MD', placeholder: '+373 00 000 000', helpText: 'Includeți codul de țară MD +373 înaintea numărului de telefon', }, { countryCode: 'HU', placeholder: '+36 00 000 0000', helpText: 'A telefonszám előtt adja meg a HU országkódot +36', }, { countryCode: 'NZ', placeholder: '+64 00 000 0000', helpText: 'Include the NZ country code +64 before the phone number', }, { countryCode: 'ME', placeholder: '+382 00 000 000', helpText: 'Uključite ME pozivni broj države +382 prije telefonskog broja', }, ]; if (!countryCode || typeof countryCode !== 'string') { return mockPlaceholders[0].helpText; } const selectedHelpText = mockPlaceholders.find(function(item) { return item && item.countryCode === countryCode; }); return selectedHelpText ? selectedHelpText.helpText : mockPlaceholders[0].helpText; } function setDefaultHelpText(countryCode) { const helpTextSpan = document.querySelector('#help-text'); if (!helpTextSpan) { return; } } function updateHelpTextCountryCode(countryCode, fieldName) { if (!countryCode || !fieldName) { return; } setDefaultHelpText(countryCode); } function initializeSmsPhoneDropdown(fieldName) { if (!fieldName || typeof fieldName !== 'string') { return; } const dropdown = document.querySelector('#country-select-' + fieldName); const displayFlag = document.querySelector('#flag-display-' + fieldName); if (!dropdown || !displayFlag) { return; } const smsPhoneData = window.MC?.smsPhoneData; if (smsPhoneData && smsPhoneData.programs && Array.isArray(smsPhoneData.programs)) { dropdown.innerHTML = generateDropdownOptions(smsPhoneData.programs); } const defaultProgram = getDefaultCountryProgram(smsPhoneData?.defaultCountryCode, smsPhoneData?.programs); if (defaultProgram && defaultProgram.countryCode) { dropdown.value = defaultProgram.countryCode; const flagSpan = displayFlag?.querySelector('#flag-emoji-' + fieldName); if (flagSpan) { flagSpan.textContent = getCountryUnicodeFlag(defaultProgram.countryCode); flagSpan.setAttribute('aria-label', sanitizeHtml(defaultProgram.countryCode) + ' flag'); } updateSmsLegalText(defaultProgram.countryCode, fieldName); updatePlaceholder(defaultProgram.countryCode, fieldName); updateCountryCodeInstruction(defaultProgram.countryCode, fieldName); } var smsNotRequiredRemoveCountryCodeEnabled = true; var smsField = Object.values({"EMAIL":{"name":"EMAIL","label":"Email Address","helper_text":"","type":"email","required":true,"audience_field_name":"Email Address","merge_id":0,"help_text_enabled":false,"enabled":true,"order":0,"field_type":"merge"},"FNAME":{"name":"FNAME","label":"First Name","helper_text":"","type":"text","required":false,"audience_field_name":"First Name","enabled":false,"order":null,"field_type":"merge","merge_id":1},"MMERGE2":{"name":"MMERGE2","label":"Second Name","helper_text":"","type":"text","required":false,"audience_field_name":"Second Name","enabled":false,"order":null,"field_type":"merge","merge_id":2},"MMERGE3":{"name":"MMERGE3","label":"Company Name","helper_text":"","type":"text","required":false,"audience_field_name":"Company Name","enabled":false,"order":null,"field_type":"merge","merge_id":3},"MMERGE4":{"name":"MMERGE4","label":"Job Title","helper_text":"","type":"text","required":false,"audience_field_name":"Job Title","enabled":false,"order":null,"field_type":"merge","merge_id":4},"SIGNUP":{"name":"SIGNUP","label":"Signup form location","helper_text":"","type":"text","required":false,"audience_field_name":"Signup form location","enabled":false,"order":null,"field_type":"merge","merge_id":5},"MMERGE6":{"name":"MMERGE6","label":"Image URL","helper_text":"","type":"imageurl","required":false,"audience_field_name":"Image URL","enabled":false,"order":null,"field_type":"merge","merge_id":6}}).find(function(f) { return f.name === fieldName && f.type === 'smsphone'; }); var isRequired = smsField ? smsField.required : false; var shouldAppendCountryCode = smsNotRequiredRemoveCountryCodeEnabled ? isRequired : true; var phoneInput = document.querySelector('#mce-' + fieldName); if (phoneInput && defaultProgram.countryCallingCode && shouldAppendCountryCode) { phoneInput.value = defaultProgram.countryCallingCode; } displayFlag?.addEventListener('click', function(e) { dropdown.focus(); }); dropdown?.addEventListener('change', function() { const selectedCountry = this.value; if (!selectedCountry || typeof selectedCountry !== 'string') { return; } const flagSpan = displayFlag?.querySelector('#flag-emoji-' + fieldName); if (flagSpan) { flagSpan.textContent = getCountryUnicodeFlag(selectedCountry); flagSpan.setAttribute('aria-label', sanitizeHtml(selectedCountry) + ' flag'); } const selectedProgram = window.MC?.smsPhoneData?.programs.find(function(program) { return program && program.countryCode === selectedCountry; }); var smsNotRequiredRemoveCountryCodeEnabled = true; var smsField = Object.values({"EMAIL":{"name":"EMAIL","label":"Email Address","helper_text":"","type":"email","required":true,"audience_field_name":"Email Address","merge_id":0,"help_text_enabled":false,"enabled":true,"order":0,"field_type":"merge"},"FNAME":{"name":"FNAME","label":"First Name","helper_text":"","type":"text","required":false,"audience_field_name":"First Name","enabled":false,"order":null,"field_type":"merge","merge_id":1},"MMERGE2":{"name":"MMERGE2","label":"Second Name","helper_text":"","type":"text","required":false,"audience_field_name":"Second Name","enabled":false,"order":null,"field_type":"merge","merge_id":2},"MMERGE3":{"name":"MMERGE3","label":"Company Name","helper_text":"","type":"text","required":false,"audience_field_name":"Company Name","enabled":false,"order":null,"field_type":"merge","merge_id":3},"MMERGE4":{"name":"MMERGE4","label":"Job Title","helper_text":"","type":"text","required":false,"audience_field_name":"Job Title","enabled":false,"order":null,"field_type":"merge","merge_id":4},"SIGNUP":{"name":"SIGNUP","label":"Signup form location","helper_text":"","type":"text","required":false,"audience_field_name":"Signup form location","enabled":false,"order":null,"field_type":"merge","merge_id":5},"MMERGE6":{"name":"MMERGE6","label":"Image URL","helper_text":"","type":"imageurl","required":false,"audience_field_name":"Image URL","enabled":false,"order":null,"field_type":"merge","merge_id":6}}).find(function(f) { return f.name === fieldName && f.type === 'smsphone'; }); var isRequired = smsField ? smsField.required : false; var shouldAppendCountryCode = smsNotRequiredRemoveCountryCodeEnabled ? isRequired : true; var phoneInput = document.querySelector('#mce-' + fieldName); if (phoneInput && selectedProgram.countryCallingCode && shouldAppendCountryCode) { phoneInput.value = selectedProgram.countryCallingCode; } updateSmsLegalText(selectedCountry, fieldName); updatePlaceholder(selectedCountry, fieldName); updateCountryCodeInstruction(selectedCountry, fieldName); }); } document.addEventListener('DOMContentLoaded', function() { const smsPhoneFields = document.querySelectorAll('[id^="country-select-"]'); smsPhoneFields.forEach(function(dropdown) { const fieldName = dropdown?.id.replace('country-select-', ''); initializeSmsPhoneDropdown(fieldName); }); });

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