Actor(s): APT32
There is no description at this point.
rule win_soundbite_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 89480c 8b5310 8965fc 895010 e8???????? 8b4d10 8b550c } // n = 7, score = 100 // 89480c | mov dword ptr [eax + 0xc], ecx // 8b5310 | mov edx, dword ptr [ebx + 0x10] // 8965fc | mov dword ptr [ebp - 4], esp // 895010 | mov dword ptr [eax + 0x10], edx // e8???????? | // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 8b550c | mov edx, dword ptr [ebp + 0xc] $sequence_1 = { b818010000 8dbda4fcffff 899da4fcffff 899da8fcffff 899dacfcffff 889d0bfdffff e8???????? } // n = 7, score = 100 // b818010000 | mov eax, 0x118 // 8dbda4fcffff | lea edi, [ebp - 0x35c] // 899da4fcffff | mov dword ptr [ebp - 0x35c], ebx // 899da8fcffff | mov dword ptr [ebp - 0x358], ebx // 899dacfcffff | mov dword ptr [ebp - 0x354], ebx // 889d0bfdffff | mov byte ptr [ebp - 0x2f5], bl // e8???????? | $sequence_2 = { 64a300000000 8965f0 8b5d08 8d45c8 8bcb e8???????? 8b4808 } // n = 7, score = 100 // 64a300000000 | mov dword ptr fs:[0], eax // 8965f0 | mov dword ptr [ebp - 0x10], esp // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 8d45c8 | lea eax, [ebp - 0x38] // 8bcb | mov ecx, ebx // e8???????? | // 8b4808 | mov ecx, dword ptr [eax + 8] $sequence_3 = { 8d5588 898564ffffff 898568ffffff 89856cffffff 52 8d4584 } // n = 6, score = 100 // 8d5588 | lea edx, [ebp - 0x78] // 898564ffffff | mov dword ptr [ebp - 0x9c], eax // 898568ffffff | mov dword ptr [ebp - 0x98], eax // 89856cffffff | mov dword ptr [ebp - 0x94], eax // 52 | push edx // 8d4584 | lea eax, [ebp - 0x7c] $sequence_4 = { 807f1500 7558 8b570c 85d2 742b 8b450c } // n = 6, score = 100 // 807f1500 | cmp byte ptr [edi + 0x15], 0 // 7558 | jne 0x5a // 8b570c | mov edx, dword ptr [edi + 0xc] // 85d2 | test edx, edx // 742b | je 0x2d // 8b450c | mov eax, dword ptr [ebp + 0xc] $sequence_5 = { c645fc0f 85db 742e 8d95f4feffff 52 8b8dfcfcffff c743140f000000 } // n = 7, score = 100 // c645fc0f | mov byte ptr [ebp - 4], 0xf // 85db | test ebx, ebx // 742e | je 0x30 // 8d95f4feffff | lea edx, [ebp - 0x10c] // 52 | push edx // 8b8dfcfcffff | mov ecx, dword ptr [ebp - 0x304] // c743140f000000 | mov dword ptr [ebx + 0x14], 0xf $sequence_6 = { 8b4b10 894104 8b5310 8b4df0 894208 8b4310 } // n = 6, score = 100 // 8b4b10 | mov ecx, dword ptr [ebx + 0x10] // 894104 | mov dword ptr [ecx + 4], eax // 8b5310 | mov edx, dword ptr [ebx + 0x10] // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 894208 | mov dword ptr [edx + 8], eax // 8b4310 | mov eax, dword ptr [ebx + 0x10] $sequence_7 = { 83f86f 74c0 837d9000 0f85ac010000 8b458c 894588 85c0 } // n = 7, score = 100 // 83f86f | cmp eax, 0x6f // 74c0 | je 0xffffffc2 // 837d9000 | cmp dword ptr [ebp - 0x70], 0 // 0f85ac010000 | jne 0x1b2 // 8b458c | mov eax, dword ptr [ebp - 0x74] // 894588 | mov dword ptr [ebp - 0x78], eax // 85c0 | test eax, eax $sequence_8 = { 50 8d45f4 64a300000000 83ec0c 33db } // n = 5, score = 100 // 50 | push eax // 8d45f4 | lea eax, [ebp - 0xc] // 64a300000000 | mov dword ptr fs:[0], eax // 83ec0c | sub esp, 0xc // 33db | xor ebx, ebx $sequence_9 = { d3eb 2bf1 894de4 a840 740f 8b4508 c74018202b4200 } // n = 7, score = 100 // d3eb | shr ebx, cl // 2bf1 | sub esi, ecx // 894de4 | mov dword ptr [ebp - 0x1c], ecx // a840 | test al, 0x40 // 740f | je 0x11 // 8b4508 | mov eax, dword ptr [ebp + 8] // c74018202b4200 | mov dword ptr [eax + 0x18], 0x422b20 condition: 7 of them and filesize < 409600 }
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