Class: Rex::PeScan::Analyze::Information

Inherits:
Object
  • Object
show all
Defined in:
lib/rex/pescan/analyze.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(pe) ⇒ Information


75
76
77
# File 'lib/rex/pescan/analyze.rb', line 75

def initialize(pe)
  self.pe = pe
end

Instance Attribute Details

#peObject

Returns the value of attribute pe


73
74
75
# File 'lib/rex/pescan/analyze.rb', line 73

def pe
  @pe
end

Instance Method Details

#add_fields(tbl, obj, fields) ⇒ Object


79
80
81
82
83
84
85
86
87
# File 'lib/rex/pescan/analyze.rb', line 79

def add_fields(tbl, obj, fields)
  fields.each do |name|
    begin
      tbl << [name, "0x%.8x" % obj.send(name)]
    rescue ::NoMethodError => e
      $stderr.puts "Invalid field #{name}"
    end
  end
end

#scan(param) ⇒ Object


89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
# File 'lib/rex/pescan/analyze.rb', line 89

def scan(param)

  $stdout.puts "\n\n"

  tbl = table("Image Headers", ['Name', 'Value'])
  add_fields(tbl, pe.hdr.file, %W{
    Characteristics
    SizeOfOptionalHeader
    PointerToSymbolTable
    TimeDateStamp
    NumberOfSections
    Machine
  })
  $stdout.puts tbl.to_s
  $stdout.puts "\n\n"

  tbl = table("Optional Image Headers", ['Name', 'Value'])
  add_fields(tbl, pe.hdr.opt, %W{
    ImageBase
    Magic
    MajorLinkerVersion
    MinorLinkerVersion
    SizeOfCode
    SizeOfInitializeData
    SizeOfUninitializeData
    AddressOfEntryPoint
    BaseOfCode
    BaseOfData
    SectionAlignment
    FileAlignment
    MajorOperatingSystemVersion
    MinorOperatingSystemVersion
    MajorImageVersion
    MinorImageVersion
    MajorSubsystemVersion
    MinorSubsystemVersion
    Win32VersionValue
    SizeOfImage
    SizeOfHeaders
    CheckSum
    Subsystem
    DllCharacteristics
    SizeOfStackReserve
    SizeOfStackCommit
    SizeOfHeapReserve
    SizeOfHeapCommit
    LoaderFlags
    NumberOfRvaAndSizes
  })

  $stdout.puts tbl.to_s
  $stdout.puts "\n\n"

  # Get DllCharacteristics (in Integer)
  dllcharacteristics = pe.hdr.opt.struct[23].value

  if (dllcharacteristics > 0)
    tbl = table("DllCharacteristics", ['Flag', 'Value'])

    # http://msdn.microsoft.com/en-us/library/ms680339(v=vs.85).aspx
    traits = {
      :ASLR      => 'False',  #IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
      :Integrity => 'False',  #IMAGE_DLLCHARACTERISTICS_FORCE_INTEGRITY
      :NX        => 'False',  #IMAGE_DLLCHARACTERISTICS_NX_COMPAT
      :Isolation => 'False',  #IMAGE_DLLCHARACTERISTICS_NO_ISOLATION
      :SEH       => 'False',  #IMAGE_DLLCHARACTERISTICS_NO_SEH
      :Bind      => 'False',  #IMAGE_DLLCHARACTERISTICS_NO_BIND
      :WDM       => 'False',  #IMAGE_DLLCHARACTERISTICS_WDM_DRIVER
      :Terminal  => 'False'   #IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE
    }

    # Convert integer to an bit array
    c_bits = ("%32d" %dllcharacteristics.to_s(2)).split('').map { |e| e.to_i }.reverse

    # Check characteristics
    traits[:ASLR]      = 'True' if c_bits[6]  == 1  #0x0040
    traits[:Integrity] = 'True' if c_bits[7]  == 1  #0x0080
    traits[:NX]        = 'True' if c_bits[8]  == 1  #0x0100
    traits[:Isolation] = 'True' if c_bits[9]  == 1  #0x0200
    traits[:SEH]       = 'True' if c_bits[10] == 1  #0x0400
    traits[:Bind]      = 'True' if c_bits[11] == 1  #0x0800
    traits[:WDM]       = 'True' if c_bits[13] == 1  #2000
    traits[:Terminal]  = 'True' if c_bits[15] == 1  #0x8000

    # Putting results to table
    traits.each do |trait_name, trait_value|
      tbl << [trait_name, trait_value]
    end

    $stdout.puts tbl.to_s
    $stdout.puts "\n\n"
  end

  if (pe.exports)
    tbl = table("Exported Functions", ['Ordinal', 'Name', 'Address'])
    pe.exports.entries.each do |ent|
      tbl << [ent.ordinal, ent.name, "0x%.8x" % pe.rva_to_vma(ent.rva)]
    end
    $stdout.puts tbl.to_s
    $stdout.puts "\n\n"
  end

  # Rex::PeParsey::Pe doesn't seem to give us any offset information for each function,
  # which makes it difficult to calculate the actual addresses for them. So instead we
  # are using Metasm::COFF::ImportDirectory to do this task.  The ability to see
  # addresses is mainly for ROP.
  if (pe.imports)
    tbl = table("Imported Functions", ['Library', 'Address', 'Ordinal', 'Name'])
    exefmt = Metasm::AutoExe.orshellcode{ Metasm.const_get('x86_64').new }
    exe = exefmt.decode_file(pe._isource.file.path)
    ibase = pe.image_base
    exe_imports = exe.imports
    exe_imports.each do |lib|
      lib_name   = lib.libname
      ini_offset = lib.iat_p
      func_table = lib.imports
      offset     = 0
      func_table.each do |func|
        func_addr = "0x%08x" %(ibase + ini_offset + offset)
        tbl << [lib_name, func_addr, func.hint, func.name]
        offset += 4
      end
    end

    $stdout.puts tbl.to_s
    $stdout.puts "\n\n"
  end

  if(pe.config)
    tbl = table("Configuration Header", ['Name', 'Value'])
    add_fields(tbl, pe.config, %W{
      Size
      TimeDateStamp
      MajorVersion
      MinorVersion
      GlobalFlagsClear
      GlobalFlagsSet
      CriticalSectionDefaultTimeout
      DeCommitFreeBlockThreshold
      DeCommitTotalFreeThreshold
      LockPrefixTable
      MaximumAllocationSize
      VirtualMemoryThreshold
      ProcessAffinityMask
      ProcessHeapFlags
      CSDVersion
      Reserved1
      EditList
      SecurityCookie
      SEHandlerTable
      SEHandlerCount
    })
    $stdout.puts tbl.to_s
    $stdout.puts "\n\n"
  end


  if(pe.resources)
    tbl = table("Resources", ['ID', 'Language', 'Code Page', 'Size', 'Name'])
    pe.resources.keys.sort.each do |rkey|
      res = pe.resources[rkey]
      tbl << [rkey, res.lang, res.code, res.size, res.file]
    end
    $stdout.puts tbl.to_s
    $stdout.puts "\n\n"
  end

  tbl = table("Section Header", ["Name", "VirtualAddress", "SizeOfRawData", "Characteristics"])
  pe.sections.each do |sec|
    tbl << [ sec.name, *[sec.vma, sec.raw_size, sec.flags].map{|x| "0x%.8x" % x} ]
  end
  $stdout.puts tbl.to_s
  $stdout.puts "\n\n"

end

#table(name, cols) ⇒ Object


265
266
267
268
269
270
# File 'lib/rex/pescan/analyze.rb', line 265

def table(name, cols)
  Rex::Ui::Text::Table.new(
    'Header'  => name,
    'Columns' => cols
  )
end