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authorCyrille Bagard <nocbos@gmail.com>2023-10-18 20:27:58 (GMT)
committerCyrille Bagard <nocbos@gmail.com>2023-10-18 20:27:58 (GMT)
commite42109df9964b153a80ec65a5f1badc02bfb8fa6 (patch)
tree2e175960e2f023fef46be3c7f4adc58c9311c45c
parent3402b000429c6189b0103ed549edd811d68e7d5e (diff)
Add support for the crc32 checksum.
-rw-r--r--plugins/apihashing/classics/Makefile.am1
-rw-r--r--plugins/apihashing/classics/crc32.c332
-rw-r--r--plugins/apihashing/classics/crc32.h58
-rw-r--r--plugins/apihashing/core.c2
-rw-r--r--plugins/apihashing/python/classics/Makefile.am1
-rw-r--r--plugins/apihashing/python/classics/crc32.c211
-rw-r--r--plugins/apihashing/python/classics/crc32.h45
-rw-r--r--plugins/apihashing/python/classics/module.c2
-rw-r--r--tests/analysis/scan/pyapi.py24
9 files changed, 673 insertions, 3 deletions
diff --git a/plugins/apihashing/classics/Makefile.am b/plugins/apihashing/classics/Makefile.am
index b914d9a..9f97b47 100644
--- a/plugins/apihashing/classics/Makefile.am
+++ b/plugins/apihashing/classics/Makefile.am
@@ -2,6 +2,7 @@
noinst_LTLIBRARIES = libapihashingclassics.la
libapihashingclassics_la_SOURCES = \
+ crc32.h crc32.c \
djb2.h djb2.c \
ror13.h ror13.c
diff --git a/plugins/apihashing/classics/crc32.c b/plugins/apihashing/classics/crc32.c
new file mode 100644
index 0000000..98f9a6b
--- /dev/null
+++ b/plugins/apihashing/classics/crc32.c
@@ -0,0 +1,332 @@
+
+/* Chrysalide - Outil d'analyse de fichiers binaires
+ * crc32.c - transormation en empreinte d'API crc32
+ *
+ * Copyright (C) 2023 Cyrille Bagard
+ *
+ * This file is part of Chrysalide.
+ *
+ * Chrysalide is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chrysalide 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Foobar. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "crc32.h"
+
+
+#include <malloc.h>
+#include <string.h>
+
+
+#include <analysis/scan/patterns/modifier-int.h>
+
+
+
+
+/* ----------------------- RECHERCHE D'UN MOTIF DE TEXTE BRUT ----------------------- */
+
+
+/* Initialise la classe des transmissions en empreintes crc32. */
+static void g_scan_crc32_modifier_class_init(GScanCrc32ModifierClass *klass);
+
+/* Initialise une instance de transmission en empreinte crc32. */
+static void g_scan_crc32_modifier_init(GScanCrc32Modifier *);
+
+/* Supprime toutes les références externes. */
+static void g_scan_crc32_modifier_dispose(GScanCrc32Modifier *);
+
+/* Procède à la libération totale de la mémoire. */
+static void g_scan_crc32_modifier_finalize(GScanCrc32Modifier *);
+
+
+
+/* --------------------- IMPLEMENTATION DES FONCTIONS DE CLASSE --------------------- */
+
+
+/* Fournit le nom d'appel d'un modificateur pour motif. */
+static char *g_scan_crc32_modifier_get_name(const GScanCrc32Modifier *);
+
+/* Calcule l'empreinte crc32 d'un motif de recherche. */
+static uint32_t compute_crc32(const sized_binary_t *);
+
+/* Transforme une séquence d'octets pour motif de recherche. */
+static bool g_scan_crc32_modifier_transform(const GScanCrc32Modifier *, const sized_binary_t *, size_t, sized_binary_t **, size_t *);
+
+/* Retrouve l'origine d'une correspondance à partir d'un indice. */
+static char *g_scan_crc32_modifier_get_path(const GScanCrc32Modifier *, size_t *);
+
+
+
+/* ---------------------------------------------------------------------------------- */
+/* RECHERCHE D'UN MOTIF DE TEXTE BRUT */
+/* ---------------------------------------------------------------------------------- */
+
+
+/* Indique le type défini pour une transormation en encodage Crc32. */
+G_DEFINE_TYPE(GScanCrc32Modifier, g_scan_crc32_modifier, G_TYPE_API_HASH_MODIFIER);
+
+
+/******************************************************************************
+* *
+* Paramètres : klass = classe à initialiser. *
+* *
+* Description : Initialise la classe des transmissions en empreintes crc32. *
+* *
+* Retour : - *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+static void g_scan_crc32_modifier_class_init(GScanCrc32ModifierClass *klass)
+{
+ GObjectClass *object; /* Autre version de la classe */
+ GScanTokenModifierClass *modifier; /* Version de classe parente */
+
+ object = G_OBJECT_CLASS(klass);
+
+ object->dispose = (GObjectFinalizeFunc/* ! */)g_scan_crc32_modifier_dispose;
+ object->finalize = (GObjectFinalizeFunc)g_scan_crc32_modifier_finalize;
+
+ modifier = G_SCAN_TOKEN_MODIFIER_CLASS(klass);
+
+ modifier->get_name = (get_scan_modifier_name_fc)g_scan_crc32_modifier_get_name;
+
+ modifier->transform = (transform_scan_token_fc)g_scan_crc32_modifier_transform;
+ modifier->get_path = (get_modifier_path)g_scan_crc32_modifier_get_path;
+
+}
+
+
+/******************************************************************************
+* *
+* Paramètres : modifier = instance à initialiser. *
+* *
+* Description : Initialise une instance de transmission en empreinte crc32. *
+* *
+* Retour : - *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+static void g_scan_crc32_modifier_init(GScanCrc32Modifier *modifier)
+{
+
+}
+
+
+/******************************************************************************
+* *
+* Paramètres : modifier = instance d'objet GLib à traiter. *
+* *
+* Description : Supprime toutes les références externes. *
+* *
+* Retour : - *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+static void g_scan_crc32_modifier_dispose(GScanCrc32Modifier *modifier)
+{
+ G_OBJECT_CLASS(g_scan_crc32_modifier_parent_class)->dispose(G_OBJECT(modifier));
+
+}
+
+
+/******************************************************************************
+* *
+* Paramètres : modifier = instance d'objet GLib à traiter. *
+* *
+* Description : Procède à la libération totale de la mémoire. *
+* *
+* Retour : - *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+static void g_scan_crc32_modifier_finalize(GScanCrc32Modifier *modifier)
+{
+ G_OBJECT_CLASS(g_scan_crc32_modifier_parent_class)->finalize(G_OBJECT(modifier));
+
+}
+
+
+/******************************************************************************
+* *
+* Paramètres : - *
+* *
+* Description : Construit un modificateur livrant des empreintes crc32. *
+* *
+* Retour : Mécanisme mis en place. *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+GScanTokenModifier *g_scan_crc32_modifier_new(void)
+{
+ GScanTokenModifier *result; /* Structure à retourner */
+
+ result = g_object_new(G_TYPE_SCAN_CRC32_MODIFIER, NULL);
+
+ return result;
+
+}
+
+
+
+/* ---------------------------------------------------------------------------------- */
+/* IMPLEMENTATION DES FONCTIONS DE CLASSE */
+/* ---------------------------------------------------------------------------------- */
+
+
+/******************************************************************************
+* *
+* Paramètres : modifier = modificateur à consulter. *
+* *
+* Description : Fournit le nom d'appel d'un modificateur pour motif. *
+* *
+* Retour : Désignation humaine. *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+static char *g_scan_crc32_modifier_get_name(const GScanCrc32Modifier *modifier)
+{
+ char *result; /* Désignation à retourner */
+
+ result = strdup("crc32");
+
+ return result;
+
+}
+
+
+/******************************************************************************
+* *
+* Paramètres : src = séquence d'octets à traiter. *
+* *
+* Description : Calcule l'empreinte crc32 d'un motif de recherche. *
+* *
+* Retour : Valeur entière de l'empreinte déterminée. *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+static uint32_t compute_crc32(const sized_binary_t *src)
+{
+ uint32_t result; /* Valeur à retourner */
+ size_t i; /* Boucle de parcours #1 */
+ size_t k; /* Boucle de parcours #2 */
+
+ result = 0xffffffff;
+
+ for (i = 0; i < src->len; i++)
+ {
+ result ^= src->data[i];
+
+ for (k = 0; k < 8; k++)
+ result = result & 1 ? (result >> 1) ^ 0xedb88320 : result >> 1;
+
+ }
+
+ result = ~result;
+
+ return result;
+
+}
+
+
+/******************************************************************************
+* *
+* Paramètres : modifier = modificateur à solliciter. *
+* src = séquences d'octets à traiter. *
+* scount = quantité de ces séquences. *
+* dest = nouvelle(s) séquence(s) d'octets obtenue(s) [OUT] *
+* dcount = quantité de ces séquences. *
+* *
+* Description : Transforme une séquence d'octets pour motif de recherche. *
+* *
+* Retour : Bilan de l'opération : succès ou échec. *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+static bool g_scan_crc32_modifier_transform(const GScanCrc32Modifier *modifier, const sized_binary_t *src, size_t scount, sized_binary_t **dest, size_t *dcount)
+{
+ bool result; /* Bilan d'opération à renvoyer*/
+ sized_binary_t *binary; /* Raccourci vers le stockage */
+ size_t i; /* Boucle de parcours #1 */
+ const sized_binary_t *_src; /* Source courante */
+ uint32_t hash; /* Valeur d'empreinte calculée */
+
+ result = true;
+
+ *dcount = scount;
+ *dest = calloc(*dcount, sizeof(sized_binary_t));
+
+ binary = &(*dest)[0];
+
+ for (i = 0; i < scount; i++, binary++)
+ {
+ _src = src + i;
+
+ hash = compute_crc32(_src);
+
+ binary->data = malloc(sizeof(hash) * sizeof(bin_t));
+ binary->len = sizeof(hash);
+
+ memcpy(binary->data, &hash, sizeof(hash));
+
+ }
+
+ return result;
+
+}
+
+
+/******************************************************************************
+* *
+* Paramètres : modifier = modificateur à consulter. *
+* index = indice de la combinaison ciblée. [OUT] *
+* *
+* Description : Retrouve l'origine d'une correspondance à partir d'un indice.*
+* *
+* Retour : Version humainement lisible de la combinaison. *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+static char *g_scan_crc32_modifier_get_path(const GScanCrc32Modifier *modifier, size_t *index)
+{
+ char *result; /* Combinaison à retourner */
+
+ if (*index > 0)
+ {
+ result = NULL;
+ (*index)--;
+ }
+
+ else
+ result = strdup("crc32");
+
+ return result;
+
+}
diff --git a/plugins/apihashing/classics/crc32.h b/plugins/apihashing/classics/crc32.h
new file mode 100644
index 0000000..0198c5d
--- /dev/null
+++ b/plugins/apihashing/classics/crc32.h
@@ -0,0 +1,58 @@
+
+/* Chrysalide - Outil d'analyse de fichiers binaires
+ * crc32.h - prototypes pour la transormation en empreinte d'API crc32
+ *
+ * Copyright (C) 2023 Cyrille Bagard
+ *
+ * This file is part of Chrysalide.
+ *
+ * Chrysalide is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chrysalide 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Foobar. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#ifndef _PLUGINS_APIHASHING_CLASSICS_CRC32_H
+#define _PLUGINS_APIHASHING_CLASSICS_CRC32_H
+
+
+#include <glib-object.h>
+
+
+#include "../apihash.h"
+
+
+
+#define G_TYPE_SCAN_CRC32_MODIFIER g_scan_crc32_modifier_get_type()
+#define G_SCAN_CRC32_MODIFIER(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), G_TYPE_SCAN_CRC32_MODIFIER, GScanCrc32Modifier))
+#define G_IS_SCAN_CRC32_MODIFIER(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj), G_TYPE_SCAN_CRC32_MODIFIER))
+#define G_SCAN_CRC32_MODIFIER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass), G_TYPE_SCAN_CRC32_MODIFIER, GScanCrc32ModifierClass))
+#define G_IS_SCAN_CRC32_MODIFIER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), G_TYPE_SCAN_CRC32_MODIFIER))
+#define G_SCAN_CRC32_MODIFIER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj), G_TYPE_SCAN_CRC32_MODIFIER, GScanCrc32ModifierClass))
+
+
+/* Transormation en empreinte d'API crc32 (instance) */
+typedef GApiHashModifier GScanCrc32Modifier;
+
+/* Transormation en empreinte d'API crc32 (classe) */
+typedef GApiHashModifierClass GScanCrc32ModifierClass;
+
+
+/* Indique le type défini pour une transormation en empreinte crc32. */
+GType g_scan_crc32_modifier_get_type(void);
+
+/* Construit un modificateur livrant des empreintes crc32. */
+GScanTokenModifier *g_scan_crc32_modifier_new(void);
+
+
+
+#endif /* _PLUGINS_APIHASHING_CLASSICS_CRC32_H */
diff --git a/plugins/apihashing/core.c b/plugins/apihashing/core.c
index 9114afe..7e98f7c 100644
--- a/plugins/apihashing/core.c
+++ b/plugins/apihashing/core.c
@@ -32,6 +32,7 @@
# include "python/module.h"
# include "python/classics/module.h"
#endif
+#include "classics/crc32.h"
#include "classics/djb2.h"
#include "classics/ror13.h"
@@ -78,6 +79,7 @@ G_MODULE_EXPORT bool chrysalide_plugin_init(GPluginModule *plugin)
__status; \
})
+ if (result) result = REGISTER_SCAN_MODIFIER(g_scan_crc32_modifier_new());
if (result) result = REGISTER_SCAN_MODIFIER(g_scan_djb2_modifier_new());
if (result) result = REGISTER_SCAN_MODIFIER(g_scan_ror13_modifier_new());
diff --git a/plugins/apihashing/python/classics/Makefile.am b/plugins/apihashing/python/classics/Makefile.am
index e3dbc7e..316e13f 100644
--- a/plugins/apihashing/python/classics/Makefile.am
+++ b/plugins/apihashing/python/classics/Makefile.am
@@ -2,6 +2,7 @@
noinst_LTLIBRARIES = libapihashingpythonclassics.la
libapihashingpythonclassics_la_SOURCES = \
+ crc32.h crc32.c \
djb2.h djb2.c \
module.h module.c \
ror13.h ror13.c
diff --git a/plugins/apihashing/python/classics/crc32.c b/plugins/apihashing/python/classics/crc32.c
new file mode 100644
index 0000000..d7c6f7c
--- /dev/null
+++ b/plugins/apihashing/python/classics/crc32.c
@@ -0,0 +1,211 @@
+
+/* Chrysalide - Outil d'analyse de fichiers binaires
+ * crc32.c - équivalent Python du fichier "plugins/apihashing/classics/crc32.c"
+ *
+ * Copyright (C) 2023 Cyrille Bagard
+ *
+ * This file is part of Chrysalide.
+ *
+ * Chrysalide is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chrysalide 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+
+#include "crc32.h"
+
+
+#include <pygobject.h>
+
+
+#include <i18n.h>
+#include <plugins/pychrysalide/access.h>
+#include <plugins/pychrysalide/helpers.h>
+
+
+#include "../apihash.h"
+#include "../../classics/crc32.h"
+
+
+
+CREATE_DYN_CONSTRUCTOR(scan_crc32_modifier, G_TYPE_SCAN_CRC32_MODIFIER);
+
+/* Initialise une instance sur la base du dérivé de GObject. */
+static int py_scan_crc32_modifier_init(PyObject *, PyObject *, PyObject *);
+
+
+
+/******************************************************************************
+* *
+* Paramètres : self = objet à initialiser (théoriquement). *
+* args = arguments fournis à l'appel. *
+* kwds = arguments de type key=val fournis. *
+* *
+* Description : Initialise une instance sur la base du dérivé de GObject. *
+* *
+* Retour : 0. *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+static int py_scan_crc32_modifier_init(PyObject *self, PyObject *args, PyObject *kwds)
+{
+ int ret; /* Bilan de lecture des args. */
+
+#define SCAN_CRC32_MODIFIER_DOC \
+ "The *Crc32Modifier* class transforms a byte pattern into its" \
+ " crc32 encoded form.\n" \
+ "\n" \
+ "Instances can be created using the following constructor:\n" \
+ "\n" \
+ " Crc32Modifier()"
+
+ /* Initialisation d'un objet GLib */
+
+ ret = forward_pygobjet_init(self);
+ if (ret == -1) return -1;
+
+ return 0;
+
+}
+
+
+/******************************************************************************
+* *
+* Paramètres : - *
+* *
+* Description : Fournit un accès à une définition de type à diffuser. *
+* *
+* Retour : Définition d'objet pour Python. *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+PyTypeObject *get_python_scan_crc32_modifier_type(void)
+{
+ static PyMethodDef py_scan_crc32_modifier_methods[] = {
+ { NULL }
+ };
+
+ static PyGetSetDef py_scan_crc32_modifier_getseters[] = {
+ { NULL }
+ };
+
+ static PyTypeObject py_scan_crc32_modifier_type = {
+
+ PyVarObject_HEAD_INIT(NULL, 0)
+
+ .tp_name = "pychrysalide.analysis.scan.patterns.modifiers.Crc32Modifier",
+ .tp_basicsize = sizeof(PyGObject),
+
+ .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
+
+ .tp_doc = SCAN_CRC32_MODIFIER_DOC,
+
+ .tp_methods = py_scan_crc32_modifier_methods,
+ .tp_getset = py_scan_crc32_modifier_getseters,
+
+ .tp_init = py_scan_crc32_modifier_init,
+ .tp_new = py_scan_crc32_modifier_new,
+
+ };
+
+ return &py_scan_crc32_modifier_type;
+
+}
+
+
+/******************************************************************************
+* *
+* Paramètres : - *
+* *
+* Description : Prend en charge l'objet 'pychrysalide....Crc32Modifier'. *
+* *
+* Retour : Bilan de l'opération. *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+bool ensure_python_scan_crc32_modifier_is_registered(void)
+{
+ PyTypeObject *type; /* Type Python Crc32Modifier */
+ PyObject *module; /* Module à recompléter */
+ PyObject *dict; /* Dictionnaire du module */
+
+ type = get_python_scan_crc32_modifier_type();
+
+ if (!PyType_HasFeature(type, Py_TPFLAGS_READY))
+ {
+ module = get_access_to_python_module("pychrysalide.analysis.scan.patterns.modifiers");
+
+ dict = PyModule_GetDict(module);
+
+ if (!ensure_python_api_hash_modifier_is_registered())
+ return false;
+
+ if (!register_class_for_pygobject(dict, G_TYPE_SCAN_CRC32_MODIFIER, type))
+ return false;
+
+ }
+
+ return true;
+
+}
+
+
+/******************************************************************************
+* *
+* Paramètres : arg = argument quelconque à tenter de convertir. *
+* dst = destination des valeurs récupérées en cas de succès. *
+* *
+* Description : Tente de convertir en transformation en empreinte crc32. *
+* *
+* Retour : Bilan de l'opération, voire indications supplémentaires. *
+* *
+* Remarques : - *
+* *
+******************************************************************************/
+
+int convert_to_scan_crc32_modifier(PyObject *arg, void *dst)
+{
+ int result; /* Bilan à retourner */
+
+ result = PyObject_IsInstance(arg, (PyObject *)get_python_scan_crc32_modifier_type());
+
+ switch (result)
+ {
+ case -1:
+ /* L'exception est déjà fixée par Python */
+ result = 0;
+ break;
+
+ case 0:
+ PyErr_SetString(PyExc_TypeError, "unable to convert the provided argument to crc32 modifier");
+ break;
+
+ case 1:
+ *((GScanCrc32Modifier **)dst) = G_SCAN_CRC32_MODIFIER(pygobject_get(arg));
+ break;
+
+ default:
+ assert(false);
+ break;
+
+ }
+
+ return result;
+
+}
diff --git a/plugins/apihashing/python/classics/crc32.h b/plugins/apihashing/python/classics/crc32.h
new file mode 100644
index 0000000..118a916
--- /dev/null
+++ b/plugins/apihashing/python/classics/crc32.h
@@ -0,0 +1,45 @@
+
+/* Chrysalide - Outil d'analyse de fichiers binaires
+ * crc32.h - équivalent Python du fichier "plugins/apihashing/classics/crc32.h"
+ *
+ * Copyright (C) 2023 Cyrille Bagard
+ *
+ * This file is part of Chrysalide.
+ *
+ * Chrysalide is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Chrysalide 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+
+#ifndef _PLUGINS_APIHASHING_PYTHON_CLASSICS_CRC32_H
+#define _PLUGINS_APIHASHING_PYTHON_CLASSICS_CRC32_H
+
+
+#include <Python.h>
+#include <stdbool.h>
+
+
+
+/* Fournit un accès à une définition de type à diffuser. */
+PyTypeObject *get_python_scan_crc32_modifier_type(void);
+
+/* Prend en charge l'objet 'pychrysalide.analysis.scan.patterns.modifiers.Crc32Modifier'. */
+bool ensure_python_scan_crc32_modifier_is_registered(void);
+
+/* Tente de convertir en transformation en empreinte crc32. */
+int convert_to_scan_crc32_modifier(PyObject *, void *);
+
+
+
+#endif /* _PLUGINS_APIHASHING_PYTHON_CLASSICS_CRC32_H */
diff --git a/plugins/apihashing/python/classics/module.c b/plugins/apihashing/python/classics/module.c
index 7a2d3fa..b00757a 100644
--- a/plugins/apihashing/python/classics/module.c
+++ b/plugins/apihashing/python/classics/module.c
@@ -33,6 +33,7 @@
#include <plugins/pychrysalide/helpers.h>
+#include "crc32.h"
#include "djb2.h"
#include "ror13.h"
@@ -56,6 +57,7 @@ bool register_apihashing_classics_modifiers(void)
result = true;
+ if (result) result = ensure_python_scan_crc32_modifier_is_registered();
if (result) result = ensure_python_scan_djb2_modifier_is_registered();
if (result) result = ensure_python_scan_ror13_modifier_is_registered();
diff --git a/tests/analysis/scan/pyapi.py b/tests/analysis/scan/pyapi.py
index 0574d2c..e81e947 100644
--- a/tests/analysis/scan/pyapi.py
+++ b/tests/analysis/scan/pyapi.py
@@ -139,15 +139,21 @@ class TestRostPythonAPI(ChrysalideTestCase):
return struct.unpack('<I', t)[0]
- mod = find_token_modifiers_for_name('ror13')
+ # Example :
+ # - PlugX (2020) - https://vms.drweb.fr/virus/?i=21512304
+
+ mod = find_token_modifiers_for_name('crc32')
self.assertIsNotNone(mod)
- source = b'GetProcAddress'
+ source = b'GetCurrentProcess\x00'
transformed = mod.transform(source)
- self.assertEqual(b2i(transformed[0]), 0x7c0dfcaa)
+ self.assertEqual(b2i(transformed[0]), 0x3690e66)
+ # Example :
+ # - GuLoader (2020) - https://www.crowdstrike.com/blog/guloader-malware-analysis/
+
mod = find_token_modifiers_for_name('djb2')
self.assertIsNotNone(mod)
@@ -157,6 +163,18 @@ class TestRostPythonAPI(ChrysalideTestCase):
self.assertEqual(b2i(transformed[0]), 0xcf31bb1f)
+ # Example :
+ # - ?? (2021) - https://www.threatspike.com/blogs/reflective-dll-injection
+
+ mod = find_token_modifiers_for_name('ror13')
+ self.assertIsNotNone(mod)
+
+ source = b'GetProcAddress'
+ transformed = mod.transform(source)
+
+ self.assertEqual(b2i(transformed[0]), 0x7c0dfcaa)
+
+
def testBytePatternModifiersAPI(self):
"""Validate the API for pattern modifiers."""