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Add check for reproducible build in PE module #1219

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Add check for reproducible build in PE module #1219

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7e15f19
Add check for reproducible build in PE module
cherepanov74 Feb 19, 2020
d74f307
Merge pull request #1 from VirusTotal/master
cherepanov74 Mar 3, 2020
3e1029e
Add test for is_reproducible_build
cherepanov74 Mar 3, 2020
d923c6e
Additional improvements for is_reproducible_build
cherepanov74 Apr 10, 2020
622dee3
Merge branch 'master' of https://github.com/VirusTotal/yara into Viru…
cherepanov74 Dec 25, 2021
8e5d6ae
Merge branch 'VirusTotal-master'
cherepanov74 Dec 25, 2021
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7 changes: 7 additions & 0 deletions docs/modules/pe.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -820,6 +820,13 @@ Reference
Path of the PDB file for this PE if present.

* Example: pe.pdb_path == "D:\\workspace\\2018_R9_RelBld\\target\\checkout\\custprof\\Release\\custprof.pdb"

.. c:type:: is_reproducible_build

.. versionadded:: 3.13.0

Value that indicates if the PE is build using compiler settings to achieve reproducibility.


.. c:function:: exports(function_name)

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6 changes: 6 additions & 0 deletions libyara/include/yara/pe.h
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Expand Up @@ -465,7 +465,13 @@ typedef struct _IMAGE_RESOURCE_DIRECTORY {
#define IMAGE_DEBUG_TYPE_MISC 4
#define IMAGE_DEBUG_TYPE_EXCEPTION 5
#define IMAGE_DEBUG_TYPE_FIXUP 6
#define IMAGE_DEBUG_TYPE_OMAP_TO_SRC 7
#define IMAGE_DEBUG_TYPE_OMAP_FROM_SRC 8
#define IMAGE_DEBUG_TYPE_BORLAND 9
#define IMAGE_DEBUG_TYPE_RESERVED10 10
#define IMAGE_DEBUG_TYPE_CLSID 11
#define IMAGE_DEBUG_TYPE_REPRO 16
#define IMAGE_DEBUG_TYPE_EX_DLLCHARACTERISTICS 20

typedef struct _IMAGE_DEBUG_DIRECTORY {
DWORD Characteristics;
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12 changes: 10 additions & 2 deletions libyara/modules/pe/pe.c
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Expand Up @@ -292,6 +292,8 @@ static void pe_parse_debug_directory(
size_t pdb_path_len;
char* pdb_path = NULL;

set_integer(0, pe->object, "is_reproducible_build");
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Does it make sense to set this to zero here? What happens if the debug directory entry (or something else we check later on) is corrupt. In this case a user can get an incorrect value (pe.is_reproducible_build would be zero) when it should be UNDEFINED at this point.

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Thank you for your suggestion. Now the value is set to 0 only when debug directory is empty or when code successfully iterated through all entries


data_dir = pe_get_directory_entry(
pe, IMAGE_DIRECTORY_ENTRY_DEBUG);

Expand Down Expand Up @@ -322,6 +324,12 @@ static void pe_parse_debug_directory(

if (!struct_fits_in_pe(pe, debug_dir, IMAGE_DEBUG_DIRECTORY))
break;

if (yr_le32toh(debug_dir->Type) == IMAGE_DEBUG_TYPE_REPRO)
{
set_integer(1, pe->object, "is_reproducible_build");
continue;
}

if (yr_le32toh(debug_dir->Type) != IMAGE_DEBUG_TYPE_CODEVIEW)
continue;
Expand Down Expand Up @@ -363,7 +371,6 @@ static void pe_parse_debug_directory(
if (pdb_path_len > 0 && pdb_path_len < MAX_PATH)
{
set_sized_string(pdb_path, pdb_path_len, pe->object, "pdb_path");
break;
}
}
}
Expand Down Expand Up @@ -2806,7 +2813,8 @@ begin_declarations;
declare_integer("number_of_symbols");
declare_integer("size_of_optional_header");
declare_integer("characteristics");

declare_integer("is_reproducible_build");

declare_integer("entry_point");
declare_integer("image_base");
declare_integer("number_of_rva_and_sizes");
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8 changes: 8 additions & 0 deletions tests/test-pe.c
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Expand Up @@ -279,6 +279,14 @@ int main(int argc, char** argv)
}",
"tests/data/mtxex.dll");

assert_true_rule_file(
"import \"pe\" \
rule test { \
condition: \
pe.is_reproducible_build == 1 \
}",
"tests/data/mtxex.dll");

assert_true_rule_file(
"import \"pe\" \
rule test { \
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