malware or not

26 Dec 2020

      Hello,

              I have found numerous files being added to my /usr/bin 
folder.I want to know if one of them,a perl script is malware.I strongly 
suspect that it is malware.Unfortunately, I don't know enough about perl 
to be able to tell for sure.The script doesn't seem to work properly and 
seems to hang the perl interperetor.Be very careful running it.I will 
embed it at the bottom of this email.If it is malware and something 
new,please forward it to the relevant people.Thanks.The filename on my 
hard drive is function_grep.pl

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#! /usr/bin/perl -w
#
# Copyright 2000 Patrik Stridvall
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
#

use strict;

my $name0=$0;
$name0 =~ s%^.*/%%;

my $invert = 0;
my $pattern;
my @files = ();
my $usage;

while(defined($_ = shift)) {
     if (/^-v$/) {
         $invert = 1;
     } elsif (/^--?(\?|h|help)$/) {
         $usage=0;
     } elsif (/^-/) {
         print STDERR "$name0:error: unknown option '$_'\n";
         $usage=2;
         last;
     } elsif(!defined($pattern)) {
         $pattern = $_;
     } else {
         push @files, $_;
     }
}
if (defined $usage)
{
     print "Usage: $name0 [--help] [-v] pattern files...\n";
     print "where:\n";
     print "--help    Prints this help message\n";
     print "-v        Return functions that do not match pattern\n";
     print "pattern   A regular expression for the function name\n";
     print "files...  A list of files to search the function in\n";
     exit $usage;
}

foreach my $file (@files) {
     open(IN, "< $file") || die "Error: Can't open $file: $!\n";

     my $level = 0;
     my $extern_c = 0;

     my $again = 0;
     my $lookahead = 0;
     while($again || defined(my $line = <IN>)) {
     if(!$again) {
         chomp $line;
         if($lookahead) {
         $lookahead = 0;
         $_ .= "\n" . $line;
         } else {
         $_ = $line;
         }
     } else {
         $again = 0;
     }

     # remove C comments
     if(s/^(|.*?[^\/])(\/\*.*?\*\/)(.*)$/$1 $3/s) {
         $again = 1;
         next;
     } elsif(/^(.*?)\/\*/s) {
         $lookahead = 1;
         next;
     }

     # remove C++ comments
     while(s/^(.*?)\/\/.*?$/$1\n/s) { $again = 1; }
     if($again) { next; }

     # remove empty rows
     if(/^\s*$/) { next; }

     # remove preprocessor directives
     if(s/^\s*\#/\#/m) {
         if(/^\#[.\n\r]*?\\$/m) {
         $lookahead = 1;
         next;
         } elsif(s/^\#\s*(.*?)(\s+(.*?))?\s*$//m) {
         next;
         }
     }

     # Remove extern "C"
     if(s/^\s*extern[\s\n]+"C"[\s\n]+\{//m) {
         $extern_c = 1;
         $again = 1;
         next;
     } elsif(m/^\s*extern[\s\n]+"C"/m) {
         $lookahead = 1;
         next;
     }

     if($level > 0)
     {
         my $line = "";
         while(/^[^\{\}]/) {
         s/^([^\{\}\'\"]*)//s;
         $line .= $1;
             if(s/^\'//) {
             $line .= "\'";
             while(/^./ && !s/^\'//) {
             s/^([^\'\\]*)//s;
             $line .= $1;
             if(s/^\\//) {
                 $line .= "\\";
                 if(s/^(.)//s) {
                 $line .= $1;
                 if($1 eq "0") {
                     s/^(\d{0,3})//s;
                     $line .= $1;
                 }
                 }
             }
             }
             $line .= "\'";
         } elsif(s/^\"//) {
             $line .= "\"";
             while(/^./ && !s/^\"//) {
             s/^([^\"\\]*)//s;
             $line .= $1;
             if(s/^\\//) {
                 $line .= "\\";
                 if(s/^(.)//s) {
                 $line .= $1;
                 if($1 eq "0") {
                     s/^(\d{0,3})//s;
                     $line .= $1;
                 }
                 }
             }
             }
             $line .= "\"";
         }
         }

         if(s/^\{//) {
         $_ = $'; $again = 1;
         $line .= "{";
         $level++;
         } elsif(s/^\}//) {
         $_ = $'; $again = 1;
         $line .= "}" if $level > 1;
         $level--;
         if($level == -1 && $extern_c) {
             $extern_c = 0;
             $level = 0;
         }
         }

         next;
     } elsif(/^class[^\}]*{/) {
         $_ = $'; $again = 1;
         $level++;
         next;
     } elsif(/^class[^\}]*$/) {
         $lookahead = 1;
         next;
     } elsif(/^typedef[^\}]*;/) {
         next;
         } elsif(/(extern\s+|static\s+)?
         (?:__inline__\s+|__inline\s+|inline\s+)?
((struct\s+|union\s+|enum\s+)?(?:\w+(?:\:\:(?:\s*operator\s*[^\)\s]+)?)?)+((\s*(?:\*|\&))+\s*|\s+))
((__cdecl|__stdcall|CDECL|VFWAPIV|VFWAPI|WINAPIV|WINAPI|CALLBACK)\s+)?
         ((?:\w+(?:\:\:)?)+(\(\w+\))?)\s*\(([^\)]*)\)\s*
         (?:\w+(?:\s*\([^\)]*\))?\s*)*\s*
                 (\{|\;)/sx)
     {
         $_ = $'; $again = 1;
         if($11 eq "{")  {
         $level++;
         }

         my $linkage = $1;
             my $return_type = $2;
             my $calling_convention = $7;
             my $name = $8;
             my $arguments = $10;

             if(!defined($linkage)) {
                 $linkage = "";
             }

             if(!defined($calling_convention)) {
                 $calling_convention = "";
             }

             $linkage =~ s/\s*$//;

             $return_type =~ s/\s*$//;
             $return_type =~ s/\s*\*\s*/*/g;
             $return_type =~ s/(\*+)/ $1/g;

             $arguments =~ y/\t\n/  /;
             $arguments =~ s/^\s*(.*?)\s*$/$1/;
             if($arguments eq "") { $arguments = "void" }

             my @argument_types;
             my @argument_names;
             my @arguments = split(/,/, $arguments);
             foreach my $n (0..$#arguments) {
                 my $argument_type = "";
                 my $argument_name = "";
                 my $argument = $arguments[$n];
                 $argument =~ s/^\s*(.*?)\s*$/$1/;
                 # print "  " . ($n + 1) . ": '$argument'\n";
                 $argument =~ s/^(IN OUT(?=\s)|IN(?=\s)|OUT(?=\s)|\s*)\s*//;
                 $argument =~ 
s/^(const(?=\s)|CONST(?=\s)|__const(?=\s)|__restrict(?=\s)|\s*)\s*//;
                 if($argument =~ /^\.\.\.$/) {
                     $argument_type = "...";
                     $argument_name = "...";
                 } elsif($argument =~ /^
((?:struct\s+|union\s+|enum\s+|(?:signed\s+|unsigned\s+)
(?:short\s+(?=int)|long\s+(?=int))?)?(?:\w+(?:\:\:)?)+)\s*
((?:const(?=\s)|CONST(?=\s)|__const(?=\s)|__restrict(?=\s))?\s*(?:\*\s*?)*)\s*
(?:const(?=\s)|CONST(?=\s)|__const(?=\s)|__restrict(?=\s))?\s*
             (\w*)\s*
             (?:\[\]|\s+OPTIONAL)?/x)
                 {
                     $argument_type = "$1";
                     if($2 ne "") {
                         $argument_type .= " $2";
                     }
                     $argument_name = $3;

                     $argument_type =~ s/\s*const\s*/ /;
                     $argument_type =~ s/^\s*(.*?)\s*$/$1/;

                     $argument_name =~ s/^\s*(.*?)\s*$/$1/;
                 } else {
                     die "$file: $.: syntax error: '$argument'\n";
                 }
                 $argument_types[$n] = $argument_type;
                 $argument_names[$n] = $argument_name;
                 # print "  " . ($n + 1) . ": '$argument_type': 
'$argument_name'\n";
             }
             if($#argument_types == 0 && $argument_types[0] =~ /^void$/i) {
                 $#argument_types = -1;
                 $#argument_names = -1;
             }

         @arguments = ();
             foreach my $n (0..$#argument_types) {
         if($argument_names[$n] && $argument_names[$n] ne "...") {
             if($argument_types[$n] !~ /\*$/) {
             $arguments[$n] = $argument_types[$n] . " " . 
$argument_names[$n];
             } else {
             $arguments[$n] = $argument_types[$n] . $argument_names[$n];
             }
         } else {
             $arguments[$n] = $argument_types[$n];
         }
         }

         $arguments = join(", ", @arguments);
         if(!$arguments) { $arguments = "void"; }

         if((!$invert && $name =~ /$pattern/) || ($invert && $name !~ 
/$pattern/)) {
         if($calling_convention) {
             print "$return_type $calling_convention $name($arguments)\n";
         } else {
             if($return_type =~ /\*$/) {
             print "$return_type$name($arguments)\n";
             } else {
             print "$return_type $name($arguments)\n";
             }
         }
         }
         } elsif(/\'(?:[^\\\']*|\\.)*\'/s) {
             $_ = $'; $again = 1;
         } elsif(/\"(?:[^\\\"]*|\\.)*\"/s) {
             $_ = $'; $again = 1;
         } elsif(/;/s) {
             $_ = $'; $again = 1;
         } elsif(/extern\s+"C"\s+{/s) {
             $_ = $'; $again = 1;
         } elsif(/\{/s) {
             $_ = $'; $again = 1;
             $level++;
         } else {
             $lookahead = 1;
         }
     }
     close(IN);
}

Peter Wolf

Andrew Pam

Trent W. Buck

tags

participants (3)