mirror of
https://github.com/Cisco-Talos/clamav.git
synced 2025-10-19 18:33:16 +00:00
a21cc6dcd7
* Added loglevel parameter to logg() * Fix logg and mprintf internals with new loglevels * Update all logg calls to set loglevel * Update all mprintf calls to set loglevel * Fix hidden logg calls * Executed clam-format
84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
VIRUSNAME_PREFIX("SUBMIT.contains")
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VIRUSNAMES("EmbedPE")
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/* Target type is 13, internal JSON properties */
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TARGET(13)
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/* JSON API call will require FUNC_LEVEL_098_5 = 78 */
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FUNCTIONALITY_LEVEL_MIN(FUNC_LEVEL_098_5)
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SIGNATURES_DECL_BEGIN
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DECLARE_SIGNATURE(sig1)
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SIGNATURES_DECL_END
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SIGNATURES_DEF_BEGIN
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/* search @offset 0 : '{ "Magic": "CLAMJSON' */
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/* this can be readjusted for specific filetypes */
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DEFINE_SIGNATURE(sig1, "0:7b20224d61676963223a2022434c414d4a534f4e")
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SIGNATURES_END
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bool logical_trigger(void)
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{
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return matches(Signatures.sig1);
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}
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#define STR_MAXLEN 256
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int entrypoint()
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{
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int i;
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int32_t type, obj, objarr, objit, arrlen, strlen;
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char str[STR_MAXLEN];
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/* check is json is available, alerts on inactive (optional) */
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if (!json_is_active()) {
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return -1;
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}
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/* acquire array of internal contained objects */
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objarr = json_get_object("ContainedObjects", 16, 0);
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type = json_get_type(objarr);
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/* debug print uint (no '\n' or prepended message */
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debug_print_uint(type);
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if (type != JSON_TYPE_ARRAY) {
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return -1;
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}
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/* check array length for iteration over elements */
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arrlen = json_get_array_length(objarr);
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for (i = 0; i < arrlen; ++i) {
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/* acquire json object @ idx i */
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objit = json_get_array_idx(i, objarr);
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if (objit <= 0) continue;
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/* acquire FileType object of the array element @ idx i */
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obj = json_get_object("FileType", 8, objit);
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if (obj <= 0) continue;
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/* acquire and check type */
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type = json_get_type(obj);
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if (type == JSON_TYPE_STRING) {
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/* acquire string length, note +1 is for the NULL terminator */
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strlen = json_get_string_length(obj) + 1;
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/* prevent buffer overflow */
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if (strlen > STR_MAXLEN)
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strlen = STR_MAXLEN;
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/* acquire string data, note strlen includes NULL terminator */
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if (json_get_string(str, strlen, obj)) {
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/* debug print str (with '\n' and prepended message */
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debug_print_str(str, strlen);
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/* check the contained object's type */
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if (strlen == 14 && !memcmp(str, "CL_TYPE_MSEXE", 14)) {
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// if (!strcmp(str, strlen, "CL_TYPE_MSEXE", strlen)) {
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/* alert for submission */
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foundVirus("EmbedPE");
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return 0;
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}
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}
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}
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}
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return 0;
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}
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