内容简介:Today I noticedNew Redditwas asking to use DRM. So I went on a source code analysis journey! See themain post for more details.It appears Reddit usesThis code is only run if the
Today I noticedNew Redditwas asking to use DRM. So I went on a source code analysis journey! See themain post for more details.
It appears Reddit uses White Ops for fingerprinting and ad fraud prevention (but only sometimes, I think it’s an A/B test). See this beautified code:
const t = e.user.account ? Jt()(e.user.account.id).toString() : void 0, s = document.createElement("script"); s.src = Object(es.a)("https://s.udkcrj.com/ag/386183/clear.js", { dt: "3861831591810830724000", pd: "acc", mo: 0, et: 0, ti: $t()(), ui: t, si: "d2x" }), document.head.appendChild(s)
This code is only run if the show_white_ops
feature flag is enabled (don’t know how to force this to be true), which is why I assume the tracking is done byWhiteOps.
Further research into the https://s.udkcrj.com/ag/386183/clear.js
file reveals that it ends up loading another script, https://s.udkcrj.com/2/4.71.0/main.js
. For reference, here is the beautified source code I saw and analyzed
.
Note: here is a function I used to deobfuscate many strings in the code:
const deob = x => x.replace(/[A-Za-z]/g, function(e) { return String.fromCharCode(e.charCodeAt(0) + (e.toUpperCase() <= "M" ? 13 : -13)) })
Note 2: Ozoki appears to be some sort of internal codename used by WhiteOps.
This very obfuscated script does many things, including (this is an incomplete list, I have missed many things):
-
Communicates with
vprza.com
andminkatu.com
- Does device/OS detection
-
Attempts to detect if DevTools is open (looks at
__IE_DEVTOOLBAR_CONSOLE_COMMAND_LINE
) -
Something weird with the
text-underline-offset
CSS property - Has the names of a bunch of ad servers, presumably as to not serve ads to bots
-
Attempts to create an
ActiveXObject
(only exists in old IE versions), and checks if the created ActiveX objectisSandboxed
-
Checks for
maxConnectionsPerServer
andonhelp
properties onwindow
(for browser engine detection I think) -
Attempts to exploit an IE11 vuln!
-
it checks the value of
document.documentMode
, which in IE11 is11
. If it is, then it runs the obfuscated code:
-
it checks the value of
// o == document.documentMode == 11 "}o|B65niitbmd,ahg)Z[i$_g".replace(/./g, function(e) { return String.fromCharCode(e.charCodeAt(0) - o--) })
res://ieframe.dll/acr.js
execScript("e71012934811a=false::On Error Resume Next::" + e + "::if Err.Number=-2147024891 or Err.Number=5002 then e71012934811a=true::Err.Clear", "VBScript"), t = "e71012934811a" in window ? window.e71012934811a ? o.EXISTS : o.MISSING : o.UNKNOWN
-
checks for these strings on window (de-obfuscated, I also have the original obfuscated ones in case you are also looking through the source):
-
boltsWebViewAppLinkResolverResult
,GoogleJsInterface
,googleAdsJsInterface
,accessibilityTraversal
,accessibility
,FbPlayableAd
,__REACT_WEB_VIEW_BRIDGE
-
obfuscated in code as
obygfJroIvrjNccYvaxErfbyireErfhyg
,TbbtyrWfVagresnpr
,tbbtyrNqfWfVagresnpr
,npprffvovyvglGenirefny
,npprffvovyvgl
,SoCynlnoyrNq
,__ERNPG_JRO_IVRJ_OEVQTR
-
-
checks the screen’s
availHeight
,availWidth
,width
, and `height -
checks the screen’s
colorDepth
,pixelDepth
, anddevicePixelRatio
-
checks for these automation-related properties on
window
:domAutomation
,domAutomationController
,_WEBDRIVER_ELEM_CACHE
,_phantom
,callPhantom
,window.chrome._commandLineAPI
,window.Debug.debuggerEnabled
,__BROWSERTOOLS_CONSOLE
,window._FirebugCommandLine
, and also ifdocument.documentElement.hasAttribute("webdriver")
is true -
checks if
"function () { return Function.apply.call(x.log, x, arguments); }" == window.console.log.toString()
(also to check for browser automation I guess -
tries to check if the browser is headless with
isExternalUrlSafeForNavigation
,window.opera._browserjsran
,window.opera.browserjsran
-
checks if
navigator.onLine
is true -
check the
window.chrome
object if in Chrome -
extracts data from
window.FirefoxInterfaces("wdICoordinate", "wdIMouse", "wdIStatus")
-
checks if
window.XPCOMUtils
exists -
checks if
window.netscape.security.privilegemanager
exists - appears to check browser console timing
-
checks referer against
"https://www.google.com", "https://apps.skype.com", "http://apps.skype.com", "https://www.youtube.com", "http://en.wikipedia.org/", "https://en.wikipedia.org/", "https://www.netflix.com", "http://www.netflix.com", "http://www3.oovoo.com"
-
checks for these properties in
window.external
:["AddChannel", "AddDesktopComponent", "AddFavorite", "AddSearchProvider", "AddService", "AddToFavoritesBar", "AutoCompleteSaveForm", "AutoScan", "bubbleEvent", "ContentDiscoveryReset", "ImportExportFavorites", "InPrivateFilteringEnabled", "IsSearchProviderInstalled", "IsServiceInstalled", "IsSubscribed", "msActiveXFilteringEnabled", "msAddSiteMode", "msAddTrackingProtectionList", "msClearTile", "msEnableTileNotificationQueue", "msEnableTileNotificationQueueForSquare150x150", "msEnableTileNotificationQueueForSquare310x310", "msEnableTileNotificationQueueForWide310x150", "msIsSiteMode", "msIsSiteModeFirstRun", "msPinnedSiteState", "msProvisionNetworks", "msRemoveScheduledTileNotification", "msReportSafeUrl", "msScheduledTileNotification", "msSiteModeActivate", "msSiteModeAddButtonStyle", "msSiteModeAddJumpListItem", "msSiteModeAddThumbBarButton", "msSiteModeClearBadge", "msSiteModeClearIconOverlay", "msSiteModeClearJumpList", "msSiteModeCreateJumpList", "msSiteModeRefreshBadge", "msSiteModeSetIconOverlay", "msSiteModeShowButtonStyle", "msSiteModeShowJumpList", "msSiteModeShowThumbBar", "msSiteModeUpdateThumbBarButton", "msStartPeriodicBadgeUpdate", "msStartPeriodicTileUpdate", "msStartPeriodicTileUpdateBatch", "msStopPeriodicBadgeUpdate", "msStopPeriodicTileUpdate", "msTrackingProtectionEnabled", "NavigateAndFind", "raiseEvent", "setContextMenu", "ShowBrowserUI", "menuArguments", "onvisibilitychange", "scrollbar", "selectableContent", "version", "visibility", "mssitepinned", "AddUrlAuthentication", "CloseRegPopup", "FeatureEnabled", "GetJsonWebData", "GetRegValue", "Log", "LogShellErrorsOnly", "OpenPopup", "ReadFile", "RunGutsScript", "SaveRegInfo", "SetAppMaximizeTimeToRestart", "SetAppMinimizeTimeToRestart", "SetAutoStart", "SetAutoStartMinimized", "SetMaxMemory", "ShareEventFromBrowser", "ShowPopup", "ShowRadar", "WriteFile", "WriteRegValue", "summonWalrus"
and also"AddSearchProvider", "IsSearchProviderInstalled", "QueryInterface", "addPanel", "addPersistentPanel", "addSearchEngine"
-
checks
maxConnectionsPerServer
(on Window I think) -
attempts to detect Brave Browser with
window.brave
-
checks for a bunch more properties on
window
:
m("document_referrer", h), m("performance_timing", h, function(e) { return x.qKjvb(e) }), m("maxConnectionsPerServer", h), m("status", h), m("defaultStatus", h), m("performance_memory", h, _.flatten), m("screen", h, function(e) { return e || {} }), m("devicePixelRatio", h), m("mozPaintCount", h), m("styleMedia_type", h), m("history_length", h), m("opener", h, "top_opener", function(e) { return null !== e ? typeof e : "null" }), m("navigator_userAgent", h), m("fileCreatedDate", h), m("fileModifiedDate", h), m("fileUpdatedDate", h), m("lastModified", h), m("location_href", h), m("RemotePlayback", h), m("Permissions", h), m("Notification", h), m("MediaSession", h), m("name", h, function(e) { return e.substr(0, 128) }), m("defaultView", h, "document_defaultView", function(e) { return void 0 === e ? "undefined" : e === window }), m("console", h, _.flatten), m("localStorage", h, v), m("webkitNotifications", h, v), m("webkitAudioContext", h, v), m("chrome", h, k.Keys), m("opera", h, k.Keys), m("navigator_standalone", h), m("navtype", h, "performance_navigation_type"), m("navredirs", h, "performance_navigation_redirectCount"), m("loadTimes", h, "chrome_loadTimes"), m("vendor", h, "navigator_vendor"), m("codename", h, "navigator_appCodeName"), m("navWebdriver", h, "navigator_webdriver"), m("navLanguages", h, "navigator_languages"), m("ServiceWorker", h), m("ApplePaySetup", h), m("ApplePaySession", h), m("Cache", h), m("PaymentAddress", h), m("MerchantValidationEvent", h), m("mediaDevices", h, "navigator_mediaDevices"), m("share", h, "navigator_share"), m("onorientationchange", h), m("document_defaultView_safari", h), m("navigator_brave", h), m("navigator_brave_isBrave", h), le.hco && m("navHardwareConc", h, "navigator_hardwareConcurrency"), le.ndm && m("navDevMem", h, "navigator_deviceMemory"), le.nvl && (m("navLocks", h, "navigator_locks", function(e) { var t = typeof e; return "undefined" === t ? "undefined" : "object" === t ? "obj" : e }), m("navLocksR", h, "navigator_locks_request", function(e) { return "undefined" === typeof e ? "undefined" : e })), le.wor && m("origin", h, "origin"), "object" == typeof location && m("protocol", location), "object" == typeof document && (m("hidden", document), m("documentMode", document), m("compatMode", document), m("visibilityState", document), m("d_origin", document, "origin"), m("ddl_origin", document, "defaultView_location_origin"));
-
checks
mozIsLocallyAvailable
(which is only available on FF <= 35, and could be for checking if someone is trying to debug this script offline) -
checks how rounding of large and small numbers works, with
Math.round(.49999999999999994)
andMath.round(Math.pow(2, 52))
-
checks the installed plugins (with
navigator.plugins
) - checks the browser viewport
- attempts to get the “frame depth” (not sure what exactly that is)
-
checks for various status bars on
window
("locationbar", "menubar", "personalbar", "scrollbars", "statusbar", "toolbar"
) -
checks for
window.showModalDialog
-
checks the
-webkit-text-size-adjust
property -
checks if using
xx-small
as a font size works - Checks if image loading is enabled, by trying to load a 1x1 GIF
-
Tries to load an image with a URL of
https:/
, and checking if it loaded or errored - Checks the stringification o
-
checks for these properties on
window
:StorageItem AnimationTimeline MSFrameUILocalization HTMLDialogElement mozCancelRequestAnimationFrame SVGRenderingIntent SQLException WebKitMediaKeyError SVGGeometryElement SVGMpathElement Permissions devicePixelRatio GetSVGDocument HTMLHtmlElement CSSCharsetRule ondragexit MediaSource external DOMMatrix InternalError ArchiveRequest ByteLengthQueuingStrategy ScreenOrientation onwebkitwillrevealbottom onorientationchange WebKitGamepad GeckoActiveXObject mozInnerScreenX WeakSet PaymentRequest Generator BhxWebRequest oncancel fluid media onmousemove HTMLCollection OpenWindowEventDetail FileError SmartCardEvent guest CSSConditionRule showModelessDialog SecurityPolicyViolationEvent EventSource ServiceWorker EventTarget origin VRDisplay onpointermove HTMLBodyElement vc2hxtaq9c TouchEvent DeviceStorage DeviceLightEvent External webkitPostMessage HTMLAppletElement ErrorEvent URLSearchParams BluetoothRemoteGATTDescriptor RTCStatsReport EventException PERSISTENT MediaKeyStatusMap HTMLOptionsCollection dolphinInfo MSGesture SVGPathSegLinetoRel webkitConvertPointFromNodeToPage doNotTrack CryptoDialogs HTMLPictureElement MediaController
-
checks for these CSS properties:
scroll-snap-coordinate flex-basis webkitMatchNearestMailBlockquoteColor MozOpacity textOverflow position columns msTextSizeAdjust animationDuration msImeAlign webkitBackgroundComposite MozTextAlignLast MozOsxFontSmoothing borderRightStyle webkitGridRow cssText parentRule webkitShapeOutside justifySelf isolation -moz-column-fill offsetRotation overflowWrap OAnimationFillMode borderRight border-inline-start-color webkitLineSnap MozPerspective touchAction enableBackground borderImageSource MozColumnFill webkitAnimationFillMode MozOSXFontSmoothing XvPhonemes length webkitFilter webkitGridAutoColumns
-
checks the stringification of native functions, and verifies some functions are implemented in native code (including
performance.mark
, andFunction.prototype.toString
itself) -
attempts to get the width of the string
mmmmmmmmmmlli
in all of these fonts:"Ubuntu", "Utopia", "URW Gothic L", "Bitstream Charter", "FreeMono", "DejaVu Sans", "Droid Serif", "Liberation Sans", "Vrinda", "Kartika", "Sylfaen", "CordiaUPC", "Angsana New Bold Italic", "DFKai-SB", "Ebrima", "Lao UI", "Segoe UI Symbol", "Vijaya", "Roboto", "Apple Color Emoji", "Baskerville", "Marker Felt", "Apple Symbols", "Chalkboard", "Herculanum", "Skia", "Bahnschrift", "Andalus", "Yu Gothic", "Aldhabi", "Calibri Light"
-
checks various user agent properties in
navigator
-
Listens to the
voiceschanged
event, and keeps track of what text-to-speech voices are available -
Attempts to load
chrome://browser/skin/feeds/feedIcon.png
(I think this used to be an RSS icon in old Firefox versions) - checks for scripts injected into the page
-
checks availble video codecs and formats:
'video/mp4;codecs="avc1.42E01E, mp4a.40.2"', 'video/mp4;codecs="avc1.58A01E, mp4a.40.2"', 'video/mp4;codecs="avc1.4D401E, mp4a.40.2"', 'video/mp4;codecs="avc1.64001E, mp4a.40.2"', 'video/mp4;codecs="mp4v.20.8, mp4a.40.2"', 'video/mp4;codecs="mp4v.20.240, mp4a.40.2"', 'video/3gpp;codecs="mp4v.20.8, samr"', 'video/ogg;codecs="theora, vorbis"', 'video/ogg;codecs="theora, speex"', "audio/ogg;codecs=vorbis", "audio/ogg;codecs=speex", "audio/ogg;codecs=flac", 'video/ogg;codecs="dirac, vorbis"', 'video/x-matroska;codecs="theora, vorbis"', 'video/mp4; codecs="avc1.42E01E"', 'audio/mp4; codecs="mp4a.40.2"', 'audio/mpeg;codecs="mp3"', 'video/webm; codecs="vorbis,vp8"'
-
checks for
window.$cdc_asdjflasutopfhvcZLmcfl_
(property used by Chrome Webdriver) (obfuscated as"$" + x.qKjBI("pqp") + "_" + x.qKjBI("nfqwsynfhgbcsuipMYzpsy") + "_"
) - gets WEBGL_debug_renderer_info, which contains GPU-specific info
-
tries to detect if
IntersectionObserver
returns correct data - checks what DRM solutions are available (although doesn’t actaully use them, this is what causes the DRM popup in Firefox): looks for Widevine, PlayReady, Clearkey, and Primetime
- Attempts to load files stored in Chrome extension’s data (presumably to detect if they are installed):
chrome-extension://ianldemdppnbbojbafdkpdofceajhica/img/info.svg chrome-extension://elfchnpigjboibngodkiamfemllklmge/img/info.svg chrome-extension://npfnhmfcalmmkbpgkhjpdaiajfdhpndm/img/info.svg chrome-extension://pfobdhfgohkddopcdbifhccbbpjlakaa/img/info.svg chrome-extension://gfpioeglfjecbkeeomdidlndcagpbmj/img/info.svg chrome-extension://mnbkfnehljejnebgbgfhdkmjicgmangi/img/info.svg chrome-extension://adcggpckpldlkcobapimobdijchkigmb/img/info.svg chrome-extension://poifgggpiofkbhafbjljpbbajafcjafi/img/info.svg chrome-extension://plkjhgplpjlokmchnngcaeneiigkipeb/img/info.svg chrome-extension://hhhpajpnecmhngfgkclokcghcpfgbape/img/info.svg chrome-extension://cnncicmafnkgbonafdjnikijbhjkeink/img/info.svg chrome-extension://aoeceebmempjbabimmnfkeeioccbjkea/img/info.svg chrome-extension://pbclflhfplnkbgfokopkmjpejkokcaec/img/info.svg chrome-extension://pogfikdkppcfejpknaclddnpcjjbalbn/img/info.svg chrome-extension://mdjpmjaonahjbjncdlkjgeggjfdnnmme/img/info.svg chrome-extension://cefomhonapiagddecgpooacpnoomabne/img/info.svg chrome-extension://iokdapkmdldpeomcloobkajedcdleoib/img/info.svg chrome-extension://cndipecijohebobplligphncocjamhei/content/images/icons/16.png chrome-extension://lmpknllkkhpbfahgbkgjgopandmdbopi/blocked-notification-bar.html chrome-extension://blddopfbnibgpgfeheedhjaheikanamn/img/128x128g.png chrome-extension://nfjcghppefdfgmnblhgelkjhmljpndhh/img/icon16.png
-
checks if the source code of
window.close
(which is normally[native code]
) containsELECTRON
- there is the string “haha jit go brrrrr”, as part of what appears to be some sort of either test for a JS engine bug or exploit
- collects performance data
- checks if Safari is creating a “Web clip” screenshot of the page
以上所述就是小编给大家介绍的《Data WhiteOps Collects (to fingerprint you)》,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对 码农网 的支持!
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