Actor(s): APT32
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rule win_soundbite_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 56 894dc4 8d4dc4 51 8d55f0 } // n = 5, score = 100 // 56 | push esi // 894dc4 | mov dword ptr [ebp - 0x3c], ecx // 8d4dc4 | lea ecx, [ebp - 0x3c] // 51 | push ecx // 8d55f0 | lea edx, [ebp - 0x10] $sequence_1 = { 790a 6857000780 e8???????? 8b9d7cffffff 8b03 b901000000 2b48fc } // n = 7, score = 100 // 790a | jns 0xc // 6857000780 | push 0x80070057 // e8???????? | // 8b9d7cffffff | mov ebx, dword ptr [ebp - 0x84] // 8b03 | mov eax, dword ptr [ebx] // b901000000 | mov ecx, 1 // 2b48fc | sub ecx, dword ptr [eax - 4] $sequence_2 = { 2bc1 8b5204 8b3c82 8bcb e8???????? 8b4520 40 } // n = 7, score = 100 // 2bc1 | sub eax, ecx // 8b5204 | mov edx, dword ptr [edx + 4] // 8b3c82 | mov edi, dword ptr [edx + eax*4] // 8bcb | mov ecx, ebx // e8???????? | // 8b4520 | mov eax, dword ptr [ebp + 0x20] // 40 | inc eax $sequence_3 = { 50 c745f418224200 e8???????? cc 8bff 55 8bec } // n = 7, score = 100 // 50 | push eax // c745f418224200 | mov dword ptr [ebp - 0xc], 0x422218 // e8???????? | // cc | int3 // 8bff | mov edi, edi // 55 | push ebp // 8bec | mov ebp, esp $sequence_4 = { 8d45c8 8bcb e8???????? 8b45d8 85c0 } // n = 5, score = 100 // 8d45c8 | lea eax, [ebp - 0x38] // 8bcb | mov ecx, ebx // e8???????? | // 8b45d8 | mov eax, dword ptr [ebp - 0x28] // 85c0 | test eax, eax $sequence_5 = { 8bd0 8bcf 90 668b31 663b32 751e 6685f6 } // n = 7, score = 100 // 8bd0 | mov edx, eax // 8bcf | mov ecx, edi // 90 | nop // 668b31 | mov si, word ptr [ecx] // 663b32 | cmp si, word ptr [edx] // 751e | jne 0x20 // 6685f6 | test si, si $sequence_6 = { 50 8d45f4 64a300000000 8965f0 8b4508 33db 89858cfdffff } // n = 7, score = 100 // 50 | push eax // 8d45f4 | lea eax, [ebp - 0xc] // 64a300000000 | mov dword ptr fs:[0], eax // 8965f0 | mov dword ptr [ebp - 0x10], esp // 8b4508 | mov eax, dword ptr [ebp + 8] // 33db | xor ebx, ebx // 89858cfdffff | mov dword ptr [ebp - 0x274], eax $sequence_7 = { 8d9d9cfeffff e9???????? 8d85ecfcffff e9???????? 8db5a4fcffff e9???????? 8db5bcfcffff } // n = 7, score = 100 // 8d9d9cfeffff | lea ebx, [ebp - 0x164] // e9???????? | // 8d85ecfcffff | lea eax, [ebp - 0x314] // e9???????? | // 8db5a4fcffff | lea esi, [ebp - 0x35c] // e9???????? | // 8db5bcfcffff | lea esi, [ebp - 0x344] $sequence_8 = { 8b9dfcfcffff c645fc0f 85db 742e 8d95f4feffff 52 } // n = 6, score = 100 // 8b9dfcfcffff | mov ebx, dword ptr [ebp - 0x304] // c645fc0f | mov byte ptr [ebp - 4], 0xf // 85db | test ebx, ebx // 742e | je 0x30 // 8d95f4feffff | lea edx, [ebp - 0x10c] // 52 | push edx $sequence_9 = { 7d94 395d20 7f31 8b4d34 51 8b4d30 51 } // n = 7, score = 100 // 7d94 | jge 0xffffff96 // 395d20 | cmp dword ptr [ebp + 0x20], ebx // 7f31 | jg 0x33 // 8b4d34 | mov ecx, dword ptr [ebp + 0x34] // 51 | push ecx // 8b4d30 | mov ecx, dword ptr [ebp + 0x30] // 51 | push ecx condition: 7 of them and filesize < 409600 }
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