mirror of
https://github.com/Cisco-Talos/clamav.git
synced 2025-10-19 18:33:16 +00:00
73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
VIRUSNAME_PREFIX("SUBMIT.contains")
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VIRUSNAMES("EmbedPE")
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/* Target type is 0, all relevant files */
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TARGET(0)
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/* Declares to run bytecode only for preclassification (affecting only preclass files) */
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PRECLASS_HOOK_DECLARE
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/* JSON API call will require FUNC_LEVEL_098_5 = 78 */
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/* PRECLASS_HOOK_DECLARE will require FUNC_LEVEL_098_7 = 80 */
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FUNCTIONALITY_LEVEL_MIN(FUNC_LEVEL_098_7)
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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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