Actor(s): APT32
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rule win_soundbite_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.soundbite." info = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.6.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.soundbite" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" /* DISCLAIMER * The strings used in this rule have been automatically selected from the * disassembly of memory dumps and unpacked files, using YARA-Signator. * The code and documentation is published here: * https://github.com/fxb-cocacoding/yara-signator * As Malpedia is used as data source, please note that for a given * number of families, only single samples are documented. * This likely impacts the degree of generalization these rules will offer. * Take the described generation method also into consideration when you * apply the rules in your use cases and assign them confidence levels. */ strings: $sequence_0 = { 8b9564ffffff 51 52 ff15???????? 8b4d8c } // n = 5, score = 100 // 8b9564ffffff | mov edx, dword ptr [ebp - 0x9c] // 51 | push ecx // 52 | push edx // ff15???????? | // 8b4d8c | mov ecx, dword ptr [ebp - 0x74] $sequence_1 = { 8b4610 8b550c 89480c 8b4d08 8b4610 3b480c 0f8f86000000 } // n = 7, score = 100 // 8b4610 | mov eax, dword ptr [esi + 0x10] // 8b550c | mov edx, dword ptr [ebp + 0xc] // 89480c | mov dword ptr [eax + 0xc], ecx // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8b4610 | mov eax, dword ptr [esi + 0x10] // 3b480c | cmp ecx, dword ptr [eax + 0xc] // 0f8f86000000 | jg 0x8c $sequence_2 = { 7e30 8bc7 8d7dec e8???????? 8b5310 8b45ec } // n = 6, score = 100 // 7e30 | jle 0x32 // 8bc7 | mov eax, edi // 8d7dec | lea edi, [ebp - 0x14] // e8???????? | // 8b5310 | mov edx, dword ptr [ebx + 0x10] // 8b45ec | mov eax, dword ptr [ebp - 0x14] $sequence_3 = { 8b55e8 895628 c745fc09000000 8b45c4 8b4dc0 50 } // n = 6, score = 100 // 8b55e8 | mov edx, dword ptr [ebp - 0x18] // 895628 | mov dword ptr [esi + 0x28], edx // c745fc09000000 | mov dword ptr [ebp - 4], 9 // 8b45c4 | mov eax, dword ptr [ebp - 0x3c] // 8b4dc0 | mov ecx, dword ptr [ebp - 0x40] // 50 | push eax $sequence_4 = { 8db5bcfcffff e9???????? 8db500ffffff e9???????? 8db574fcffff e9???????? } // n = 6, score = 100 // 8db5bcfcffff | lea esi, [ebp - 0x344] // e9???????? | // 8db500ffffff | lea esi, [ebp - 0x100] // e9???????? | // 8db574fcffff | lea esi, [ebp - 0x38c] // e9???????? | $sequence_5 = { 53 56 57 83f820 7f23 } // n = 5, score = 100 // 53 | push ebx // 56 | push esi // 57 | push edi // 83f820 | cmp eax, 0x20 // 7f23 | jg 0x25 $sequence_6 = { c745d8d0ffc1ff c745dcd0ffc9ff 8d45d0 b980000000 660108 83c002 66833800 } // n = 7, score = 100 // c745d8d0ffc1ff | mov dword ptr [ebp - 0x28], 0xffc1ffd0 // c745dcd0ffc9ff | mov dword ptr [ebp - 0x24], 0xffc9ffd0 // 8d45d0 | lea eax, [ebp - 0x30] // b980000000 | mov ecx, 0x80 // 660108 | add word ptr [eax], cx // 83c002 | add eax, 2 // 66833800 | cmp word ptr [eax], 0 $sequence_7 = { 33ff 8d041b 3b4520 897dfc 8b5528 8b452c } // n = 6, score = 100 // 33ff | xor edi, edi // 8d041b | lea eax, [ebx + ebx] // 3b4520 | cmp eax, dword ptr [ebp + 0x20] // 897dfc | mov dword ptr [ebp - 4], edi // 8b5528 | mov edx, dword ptr [ebp + 0x28] // 8b452c | mov eax, dword ptr [ebp + 0x2c] $sequence_8 = { c785f8feffffeff2f9d7 889dfcfeffff c74594c3f2e5e1 c74598f4e5c6e9 c7459cece5d700 c745dcd2e5e1e4 c745e0c6e9ece5 } // n = 7, score = 100 // c785f8feffffeff2f9d7 | mov dword ptr [ebp - 0x108], 0xd7f9f2ef // 889dfcfeffff | mov byte ptr [ebp - 0x104], bl // c74594c3f2e5e1 | mov dword ptr [ebp - 0x6c], 0xe1e5f2c3 // c74598f4e5c6e9 | mov dword ptr [ebp - 0x68], 0xe9c6e5f4 // c7459cece5d700 | mov dword ptr [ebp - 0x64], 0xd7e5ec // c745dcd2e5e1e4 | mov dword ptr [ebp - 0x24], 0xe4e1e5d2 // c745e0c6e9ece5 | mov dword ptr [ebp - 0x20], 0xe5ece9c6 $sequence_9 = { 6806100000 68ffff0000 51 c785b8fcffff10270000 ff15???????? 8b95f0fcffff 8b85ecfcffff } // n = 7, score = 100 // 6806100000 | push 0x1006 // 68ffff0000 | push 0xffff // 51 | push ecx // c785b8fcffff10270000 | mov dword ptr [ebp - 0x348], 0x2710 // ff15???????? | // 8b95f0fcffff | mov edx, dword ptr [ebp - 0x310] // 8b85ecfcffff | mov eax, dword ptr [ebp - 0x314] condition: 7 of them and filesize < 409600 }
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