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Catégorie: Forensics Difficulté: - Flag: CYBN{Th1s_1s_Th3_W4y}
Description
Notre développeur junior dit avoir développé une méthode d’exfiltration indétectable.
Montrez lui que ceci n’a rien de difficile pour vous !
En ouvrant le fichier avec WireShark on voit plusieurs requêtes :
Plusieurs sont assez étranges, on a des GET, des POST et des PUT depuis l'adresse 192.168.1.3 sur l'adresse 192.168.1.2 sur des chemins tout autant étranges.
Seulement ce qu'il fallait remarquer c'était les ports de destination. On peut le voir dans le détail des requêtes :
On peut également afficher une colonne avec le port de destination en modifiant les préférences de WireShark :
En filtrant uniquement sur ces requêtes avec le filtres ip.dst == 192.168.1.2 && http :
On voit que les requêtes sont sur le port 8000 ou 9000. Cela ressemble fortement à du binaire donc importons ça dans python et faisons un script pour remplacer dans l'ordre temporel les requêtes sur le 8000 par un 0 et celles sur le 9000 par un 1. Ensuite on transforme ça selon la norme ASCII :
requests = """4 0.001169800 192.168.1.3 192.168.1.2 HTTP 224 GET /KVARZKCLUR HTTP/1.1 8000
14 0.005342995 192.168.1.3 192.168.1.2 HTTP 244 POST /YDWDXSSUVV HTTP/1.1 9000
24 0.009866902 192.168.1.3 192.168.1.2 HTTP 243 PUT /ETBVREQRIO HTTP/1.1 8000
34 0.013570239 192.168.1.3 192.168.1.2 HTTP 224 GET /HGEIWKXVHW HTTP/1.1 8000
46 0.019904783 192.168.1.3 192.168.1.2 HTTP 243 PUT /NOPBGJSIDK HTTP/1.1 8000
56 0.023512576 192.168.1.3 192.168.1.2 HTTP 243 PUT /JMJDGEUSPS HTTP/1.1 8000
66 0.027473364 192.168.1.3 192.168.1.2 HTTP 224 GET /EFGKRVZOQT HTTP/1.1 9000
76 0.031282193 192.168.1.3 192.168.1.2 HTTP 243 PUT /QAUXTKQBUQ HTTP/1.1 9000
88 0.037687712 192.168.1.3 192.168.1.2 HTTP 243 PUT /WFHOFWYKAW HTTP/1.1 8000
100 0.044557551 192.168.1.3 192.168.1.2 HTTP 243 PUT /PGIQXNEEVW HTTP/1.1 9000
110 0.048260373 192.168.1.3 192.168.1.2 HTTP 243 PUT /BTSTSERGFS HTTP/1.1 8000
122 0.053765612 192.168.1.3 192.168.1.2 HTTP 243 PUT /GPWKXIZYQY HTTP/1.1 9000
132 0.057420648 192.168.1.3 192.168.1.2 HTTP 244 POST /ALRZHMZOIW HTTP/1.1 9000
142 0.061260352 192.168.1.3 192.168.1.2 HTTP 243 PUT /YAXGWSMBUZ HTTP/1.1 8000
154 0.066646337 192.168.1.3 192.168.1.2 HTTP 243 PUT /QWNQWJQLNW HTTP/1.1 8000
166 0.072462088 192.168.1.3 192.168.1.2 HTTP 243 PUT /LAXZKGYWAZ HTTP/1.1 9000
180 0.078887222 192.168.1.3 192.168.1.2 HTTP 243 PUT /SZESLQWHKW HTTP/1.1 8000
190 0.082958903 192.168.1.3 192.168.1.2 HTTP 224 GET /FGKBLUPRTS HTTP/1.1 9000
200 0.086650677 192.168.1.3 192.168.1.2 HTTP 224 GET /AMZCJOYVVU HTTP/1.1 8000
212 0.095892604 192.168.1.3 192.168.1.2 HTTP 243 PUT /YHYQJDISUK HTTP/1.1 8000
224 0.101527302 192.168.1.3 192.168.1.2 HTTP 243 PUT /BDQXBGCAVQ HTTP/1.1 8000
234 0.106330715 192.168.1.3 192.168.1.2 HTTP 224 GET /GLKMHHTBWN HTTP/1.1 8000
244 0.110360352 192.168.1.3 192.168.1.2 HTTP 243 PUT /WBURCZOLKW HTTP/1.1 9000
256 0.115328754 192.168.1.3 192.168.1.2 HTTP 243 PUT /OWHHFUMMIR HTTP/1.1 8000
266 0.119863186 192.168.1.3 192.168.1.2 HTTP 243 PUT /XMXPAJXTGQ HTTP/1.1 8000
276 0.123334384 192.168.1.3 192.168.1.2 HTTP 224 GET /BSCDEEEYAH HTTP/1.1 9000
288 0.128429517 192.168.1.3 192.168.1.2 HTTP 243 PUT /ORZHIQYIXM HTTP/1.1 8000
298 0.131938732 192.168.1.3 192.168.1.2 HTTP 244 POST /GQMFQMHMKU HTTP/1.1 8000
308 0.135899588 192.168.1.3 192.168.1.2 HTTP 243 PUT /GHNRCJWWPS HTTP/1.1 9000
320 0.141036255 192.168.1.3 192.168.1.2 HTTP 243 PUT /YOHFORTHXN HTTP/1.1 9000
332 0.149187773 192.168.1.3 192.168.1.2 HTTP 243 PUT /IRCLBTEKUT HTTP/1.1 9000
342 0.152611654 192.168.1.3 192.168.1.2 HTTP 224 GET /HOKYJYIQNC HTTP/1.1 8000
354 0.156999719 192.168.1.3 192.168.1.2 HTTP 243 PUT /PFADNQJLHF HTTP/1.1 8000
366 0.161308512 192.168.1.3 192.168.1.2 HTTP 243 PUT /GMJFWRAWAI HTTP/1.1 9000
376 0.164841237 192.168.1.3 192.168.1.2 HTTP 243 PUT /LGKDACFPIO HTTP/1.1 9000
386 0.168325606 192.168.1.3 192.168.1.2 HTTP 224 GET /IDPINOQZJD HTTP/1.1 9000
398 0.173175813 192.168.1.3 192.168.1.2 HTTP 243 PUT /NAKIDQVPSH HTTP/1.1 9000
410 0.178126644 192.168.1.3 192.168.1.2 HTTP 243 PUT /IUAUHUFBYI HTTP/1.1 8000
420 0.181088690 192.168.1.3 192.168.1.2 HTTP 224 GET /VRISWDLCNM HTTP/1.1 9000
432 0.185794662 192.168.1.3 192.168.1.2 HTTP 243 PUT /NFVZAGKCEW HTTP/1.1 9000
444 0.190750853 192.168.1.3 192.168.1.2 HTTP 243 PUT /WIQBMJENPT HTTP/1.1 8000
456 0.196126482 192.168.1.3 192.168.1.2 HTTP 243 PUT /DQFPIPBJEM HTTP/1.1 9000
466 0.199699244 192.168.1.3 192.168.1.2 HTTP 244 POST /OWMMSAGVEK HTTP/1.1 8000
476 0.202755722 192.168.1.3 192.168.1.2 HTTP 243 PUT /PRZXBOMSFN HTTP/1.1 9000
486 0.205794773 192.168.1.3 192.168.1.2 HTTP 224 GET /JVWXSAMMHT HTTP/1.1 8000
498 0.211398827 192.168.1.3 192.168.1.2 HTTP 243 PUT /YCETAPTKCJ HTTP/1.1 9000
510 0.216151638 192.168.1.3 192.168.1.2 HTTP 243 PUT /ISBUHLRTRU HTTP/1.1 8000
522 0.220750063 192.168.1.3 192.168.1.2 HTTP 243 PUT /WGYSTCFJRB HTTP/1.1 8000
534 0.225451555 192.168.1.3 192.168.1.2 HTTP 243 PUT /TNHYUVPSXK HTTP/1.1 8000
544 0.229300766 192.168.1.3 192.168.1.2 HTTP 243 PUT /BESIUZVCOH HTTP/1.1 9000
554 0.232881137 192.168.1.3 192.168.1.2 HTTP 224 GET /FMAMTOFZPT HTTP/1.1 9000
564 0.236492212 192.168.1.3 192.168.1.2 HTTP 224 GET /OLJUKJPIME HTTP/1.1 8000
574 0.239961339 192.168.1.3 192.168.1.2 HTTP 244 POST /SKCZQYMLXL HTTP/1.1 9000
584 0.243496298 192.168.1.3 192.168.1.2 HTTP 243 PUT /XBSMQEILYL HTTP/1.1 8000
594 0.247688181 192.168.1.3 192.168.1.2 HTTP 243 PUT /PQJBDJHZOM HTTP/1.1 8000
606 0.253354501 192.168.1.3 192.168.1.2 HTTP 243 PUT /DLEAZALYOY HTTP/1.1 8000
616 0.257153336 192.168.1.3 192.168.1.2 HTTP 243 PUT /NSHMPETTZD HTTP/1.1 8000
626 0.261032192 192.168.1.3 192.168.1.2 HTTP 224 GET /VXRZMCKURW HTTP/1.1 8000
638 0.266333995 192.168.1.3 192.168.1.2 HTTP 243 PUT /SKSAWSQHGT HTTP/1.1 9000
648 0.270440316 192.168.1.3 192.168.1.2 HTTP 224 GET /FHYMAYVEWN HTTP/1.1 9000
660 0.275401251 192.168.1.3 192.168.1.2 HTTP 243 PUT /PXOSFPDVRI HTTP/1.1 8000
672 0.280290477 192.168.1.3 192.168.1.2 HTTP 243 PUT /YHJZAYDEQU HTTP/1.1 8000
682 0.284319925 192.168.1.3 192.168.1.2 HTTP 244 POST /RXCDJIBOQR HTTP/1.1 8000
692 0.289246169 192.168.1.3 192.168.1.2 HTTP 243 PUT /SXVOQYGHHO HTTP/1.1 9000
704 0.293783379 192.168.1.3 192.168.1.2 HTTP 243 PUT /VSRUBQDIDX HTTP/1.1 8000
716 0.298024862 192.168.1.3 192.168.1.2 HTTP 243 PUT /QBKPEUTZIV HTTP/1.1 9000
728 0.302968528 192.168.1.3 192.168.1.2 HTTP 243 PUT /PCQJZHPSSH HTTP/1.1 9000
740 0.307860620 192.168.1.3 192.168.1.2 HTTP 243 PUT /NQMOSTWUCM HTTP/1.1 9000
750 0.312740183 192.168.1.3 192.168.1.2 HTTP 244 POST /QOWQVQGMYP HTTP/1.1 8000
762 0.318027860 192.168.1.3 192.168.1.2 HTTP 243 PUT /ASHUNLIOBM HTTP/1.1 8000
772 0.321751225 192.168.1.3 192.168.1.2 HTTP 244 POST /SCFAJUQRVZ HTTP/1.1 9000
784 0.326678235 192.168.1.3 192.168.1.2 HTTP 243 PUT /GNPCRNVAOY HTTP/1.1 9000
796 0.332288489 192.168.1.3 192.168.1.2 HTTP 224 GET /ZQWHICHMXE HTTP/1.1 8000
806 0.336305006 192.168.1.3 192.168.1.2 HTTP 244 POST /RTVWAMXEWD HTTP/1.1 9000
816 0.340314854 192.168.1.3 192.168.1.2 HTTP 224 GET /RCLAXTHPIG HTTP/1.1 8000
826 0.343654569 192.168.1.3 192.168.1.2 HTTP 224 GET /VJZOEOGYCA HTTP/1.1 9000
836 0.347378252 192.168.1.3 192.168.1.2 HTTP 243 PUT /WGXJUUJIAS HTTP/1.1 9000
846 0.351344501 192.168.1.3 192.168.1.2 HTTP 244 POST /DJTSJSZCEA HTTP/1.1 9000
856 0.354767917 192.168.1.3 192.168.1.2 HTTP 224 GET /WLWCKBKDMF HTTP/1.1 9000
866 0.358896983 192.168.1.3 192.168.1.2 HTTP 224 GET /HEJEEMLONG HTTP/1.1 9000
876 0.363106936 192.168.1.3 192.168.1.2 HTTP 224 GET /HOTFMIPRQF HTTP/1.1 8000
886 0.366845654 192.168.1.3 192.168.1.2 HTTP 244 POST /WNELAEVYZP HTTP/1.1 8000
898 0.372077446 192.168.1.3 192.168.1.2 HTTP 243 PUT /CJCXTIVCBN HTTP/1.1 9000
908 0.376009005 192.168.1.3 192.168.1.2 HTTP 243 PUT /GRMRWNWIGL HTTP/1.1 9000
918 0.379338108 192.168.1.3 192.168.1.2 HTTP 224 GET /DKZLOELTGF HTTP/1.1 8000
928 0.383266672 192.168.1.3 192.168.1.2 HTTP 244 POST /FWBRVOYNVM HTTP/1.1 8000
938 0.387421623 192.168.1.3 192.168.1.2 HTTP 244 POST /ZVIKZVMBXR HTTP/1.1 8000
948 0.390788897 192.168.1.3 192.168.1.2 HTTP 244 POST /MZOTJPDSEE HTTP/1.1 9000
960 0.397241450 192.168.1.3 192.168.1.2 HTTP 243 PUT /DEUQUSDRAN HTTP/1.1 8000
972 0.402722741 192.168.1.3 192.168.1.2 HTTP 243 PUT /SMIMVNJJFH HTTP/1.1 9000
982 0.405843976 192.168.1.3 192.168.1.2 HTTP 224 GET /TYTGPRBPAS HTTP/1.1 9000
994 0.410674602 192.168.1.3 192.168.1.2 HTTP 243 PUT /HGBSBNKHXO HTTP/1.1 9000
1004 0.413951114 192.168.1.3 192.168.1.2 HTTP 243 PUT /BPIFFIXXEU HTTP/1.1 8000
1014 0.417244526 192.168.1.3 192.168.1.2 HTTP 244 POST /XQCVMDQFJD HTTP/1.1 8000
1024 0.420913152 192.168.1.3 192.168.1.2 HTTP 244 POST /XZXMNJPRIN HTTP/1.1 9000
1034 0.424775237 192.168.1.3 192.168.1.2 HTTP 243 PUT /HRTPZKWMKG HTTP/1.1 9000
1046 0.429308901 192.168.1.3 192.168.1.2 HTTP 243 PUT /PXHAINUGLU HTTP/1.1 8000
1058 0.434345877 192.168.1.3 192.168.1.2 HTTP 243 PUT /QBMLWATADZ HTTP/1.1 9000
1070 0.439036551 192.168.1.3 192.168.1.2 HTTP 243 PUT /ZNEXXKNJLI HTTP/1.1 8000
1080 0.442504088 192.168.1.3 192.168.1.2 HTTP 244 POST /LMAMSXZZAO HTTP/1.1 9000
1090 0.445769274 192.168.1.3 192.168.1.2 HTTP 244 POST /VUEYPDRTTR HTTP/1.1 9000
1100 0.449842137 192.168.1.3 192.168.1.2 HTTP 243 PUT /ZDNGAXFPFK HTTP/1.1 9000
1110 0.453950582 192.168.1.3 192.168.1.2 HTTP 244 POST /OBMPSPZJZI HTTP/1.1 9000
1122 0.460243071 192.168.1.3 192.168.1.2 HTTP 243 PUT /WTSXVLBWTQ HTTP/1.1 9000
1132 0.464570486 192.168.1.3 192.168.1.2 HTTP 224 GET /MGJDDYMWZY HTTP/1.1 8000
1142 0.469244831 192.168.1.3 192.168.1.2 HTTP 244 POST /CUDEBUCUXQ HTTP/1.1 9000
1152 0.473262282 192.168.1.3 192.168.1.2 HTTP 243 PUT /PYWOYGJEXH HTTP/1.1 8000
1164 0.478673679 192.168.1.3 192.168.1.2 HTTP 243 PUT /QPFMACHUMZ HTTP/1.1 9000
1174 0.483161655 192.168.1.3 192.168.1.2 HTTP 244 POST /YZEACQHEBH HTTP/1.1 8000
1186 0.488321110 192.168.1.3 192.168.1.2 HTTP 243 PUT /VQAHFETMWH HTTP/1.1 9000
1198 0.493413911 192.168.1.3 192.168.1.2 HTTP 243 PUT /SAURLKWDRD HTTP/1.1 8000
1208 0.496592584 192.168.1.3 192.168.1.2 HTTP 244 POST /IESSWLKVCQ HTTP/1.1 8000
1220 0.501649175 192.168.1.3 192.168.1.2 HTTP 244 POST /QNYYQWHEFC HTTP/1.1 8000
1232 0.506626998 192.168.1.3 192.168.1.2 HTTP 243 PUT /PFNUZXYSHS HTTP/1.1 9000
1244 0.512323070 192.168.1.3 192.168.1.2 HTTP 243 PUT /JTKLLWAZHN HTTP/1.1 9000
1256 0.517140106 192.168.1.3 192.168.1.2 HTTP 243 PUT /IUOJRBALGT HTTP/1.1 8000
1268 0.521888589 192.168.1.3 192.168.1.2 HTTP 243 PUT /WHCBQSMKYB HTTP/1.1 9000
1278 0.525111833 192.168.1.3 192.168.1.2 HTTP 244 POST /LHIAIOAUKL HTTP/1.1 8000
1288 0.528382577 192.168.1.3 192.168.1.2 HTTP 243 PUT /MRPAWYYYWH HTTP/1.1 8000
1298 0.531695799 192.168.1.3 192.168.1.2 HTTP 224 GET /IIRATIAOCA HTTP/1.1 8000
1310 0.537185904 192.168.1.3 192.168.1.2 HTTP 243 PUT /MGSUZLCQEC HTTP/1.1 8000
1320 0.540626596 192.168.1.3 192.168.1.2 HTTP 243 PUT /YRAKQLIOWX HTTP/1.1 8000
1330 0.544189372 192.168.1.3 192.168.1.2 HTTP 224 GET /BBCYYKYOYA HTTP/1.1 9000
1342 0.549918881 192.168.1.3 192.168.1.2 HTTP 243 PUT /RILNZFLXKH HTTP/1.1 9000
1352 0.553429441 192.168.1.3 192.168.1.2 HTTP 244 POST /RTRKTVLRSY HTTP/1.1 8000
1362 0.556672717 192.168.1.3 192.168.1.2 HTTP 244 POST /UPVBUYAZUH HTTP/1.1 8000
1372 0.560997294 192.168.1.3 192.168.1.2 HTTP 243 PUT /LBZKPXZOAX HTTP/1.1 9000
1382 0.564518964 192.168.1.3 192.168.1.2 HTTP 224 GET /QUAKYDBVFO HTTP/1.1 9000
1392 0.568823384 192.168.1.3 192.168.1.2 HTTP 243 PUT /GMMFCETKZN HTTP/1.1 8000
1404 0.574185044 192.168.1.3 192.168.1.2 HTTP 243 PUT /KCIXWESACO HTTP/1.1 9000
1414 0.578074929 192.168.1.3 192.168.1.2 HTTP 243 PUT /ACHRNUJNJV HTTP/1.1 8000
1424 0.582690869 192.168.1.3 192.168.1.2 HTTP 243 PUT /UONVDITFWW HTTP/1.1 9000
1434 0.587496526 192.168.1.3 192.168.1.2 HTTP 243 PUT /ALJKAWMNWV HTTP/1.1 9000
1444 0.591989308 192.168.1.3 192.168.1.2 HTTP 244 POST /EJBKRGDCKS HTTP/1.1 9000
1454 0.596911294 192.168.1.3 192.168.1.2 HTTP 243 PUT /LYKTFWPRLO HTTP/1.1 9000
1464 0.601815306 192.168.1.3 192.168.1.2 HTTP 243 PUT /KDLAGUNSNV HTTP/1.1 9000
1474 0.607007926 192.168.1.3 192.168.1.2 HTTP 244 POST /CXSDZQGCWZ HTTP/1.1 8000
1484 0.610946034 192.168.1.3 192.168.1.2 HTTP 224 GET /ATQTSALWYI HTTP/1.1 9000
1496 0.618634815 192.168.1.3 192.168.1.2 HTTP 243 PUT /EIIUOQSCPY HTTP/1.1 8000
1506 0.622617763 192.168.1.3 192.168.1.2 HTTP 244 POST /FDYESDEBKU HTTP/1.1 9000
1516 0.627395821 192.168.1.3 192.168.1.2 HTTP 243 PUT /ATFIKWZWKN HTTP/1.1 8000
1528 0.633819162 192.168.1.3 192.168.1.2 HTTP 243 PUT /TXAFSGMYHE HTTP/1.1 9000
1540 0.640121818 192.168.1.3 192.168.1.2 HTTP 243 PUT /IJLITWQYJF HTTP/1.1 9000
1552 0.646586308 192.168.1.3 192.168.1.2 HTTP 243 PUT /WFOCMUGSPD HTTP/1.1 9000
1566 0.654207184 192.168.1.3 192.168.1.2 HTTP 243 PUT /BSEENOQHJQ HTTP/1.1 8000
1576 0.658427197 192.168.1.3 192.168.1.2 HTTP 224 GET /HSYANJLRRD HTTP/1.1 8000
1588 0.665389525 192.168.1.3 192.168.1.2 HTTP 243 PUT /VXYCTABYCW HTTP/1.1 9000
1600 0.670750071 192.168.1.3 192.168.1.2 HTTP 243 PUT /YCVNSHMZMS HTTP/1.1 9000
1612 0.676073325 192.168.1.3 192.168.1.2 HTTP 243 PUT /ONLDWFRHAR HTTP/1.1 8000
1622 0.680327794 192.168.1.3 192.168.1.2 HTTP 243 PUT /JXKYMXJOKJ HTTP/1.1 9000
1634 0.687665246 192.168.1.3 192.168.1.2 HTTP 243 PUT /BCHDVOMOEQ HTTP/1.1 8000
1646 0.692893447 192.168.1.3 192.168.1.2 HTTP 243 PUT /QIHAQBISXK HTTP/1.1 8000
1658 0.698708051 192.168.1.3 192.168.1.2 HTTP 243 PUT /HETUMTSPMG HTTP/1.1 8000
1668 0.704628487 192.168.1.3 192.168.1.2 HTTP 243 PUT /BKIAYDSFGU HTTP/1.1 9000
1680 0.716177036 192.168.1.3 192.168.1.2 HTTP 243 PUT /GIOHWFUNSA HTTP/1.1 9000
1690 0.720062445 192.168.1.3 192.168.1.2 HTTP 224 GET /JIETWGWXEA HTTP/1.1 9000
1700 0.724444396 192.168.1.3 192.168.1.2 HTTP 244 POST /ISJGQZNKYR HTTP/1.1 9000
1710 0.728858257 192.168.1.3 192.168.1.2 HTTP 224 GET /KOUZEFFVQL HTTP/1.1 8000
1722 0.741172413 192.168.1.3 192.168.1.2 HTTP 243 PUT /RQHWKHZUNC HTTP/1.1 8000
1734 0.753436865 192.168.1.3 192.168.1.2 HTTP 243 PUT /FDMKHHGXII HTTP/1.1 9000
1744 0.759724351 192.168.1.3 192.168.1.2 HTTP 243 PUT /KQENAGUGSM HTTP/1.1 8000
1756 0.768861127 192.168.1.3 192.168.1.2 HTTP 243 PUT /XVXEODSHWL HTTP/1.1 9000
1766 0.773843359 192.168.1.3 192.168.1.2 HTTP 224 GET /MGDMNAWLWZ HTTP/1.1 9000
1776 0.778320534 192.168.1.3 192.168.1.2 HTTP 244 POST /XTUIOPPJDA HTTP/1.1 9000
1786 0.783017713 192.168.1.3 192.168.1.2 HTTP 243 PUT /ITKOLNBHTY HTTP/1.1 9000
1796 0.788019593 192.168.1.3 192.168.1.2 HTTP 243 PUT /OHQEOAJLMI HTTP/1.1 9000
1806 0.792671584 192.168.1.3 192.168.1.2 HTTP 224 GET /HSALWWZASV HTTP/1.1 8000
1816 0.797319059 192.168.1.3 192.168.1.2 HTTP 243 PUT /BRYOMIKUTT HTTP/1.1 9000"""
# Transformation des requêtes en 0 ou en 1
binary = ''.join(['0' if l.split(' ')[-1] == "8000" else '1' for l in requests.split('\n')])
# Prend les bit 8 à 8 et les transforme en char
print(''.join([chr(int(binary[i:i+8], 2)) for i in range(0, len(binary), 8)]))
# CYBN{Th1s_1s_Th3_W4y}
