Actor(s): Silence group
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rule win_silence_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-11-21" version = "1" description = "Detects win.silence." 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.silence" malpedia_rule_date = "20221118" malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af" malpedia_version = "20221125" 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 = { 50 6a00 6a00 68???????? c745fc00000000 } // n = 5, score = 1800 // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 // 68???????? | // c745fc00000000 | mov dword ptr [ebp - 4], 0 $sequence_1 = { 8a4801 40 84c9 75f4 eb05 803800 } // n = 6, score = 1800 // 8a4801 | mov cl, byte ptr [eax + 1] // 40 | inc eax // 84c9 | test cl, cl // 75f4 | jne 0xfffffff6 // eb05 | jmp 7 // 803800 | cmp byte ptr [eax], 0 $sequence_2 = { cc 8325????????00 c3 6a08 68???????? e8???????? e8???????? } // n = 7, score = 1800 // cc | int3 // 8325????????00 | // c3 | ret // 6a08 | push 8 // 68???????? | // e8???????? | // e8???????? | $sequence_3 = { 50 683f020f00 6a00 68???????? 6801000080 ff15???????? 68???????? } // n = 7, score = 1700 // 50 | push eax // 683f020f00 | push 0xf023f // 6a00 | push 0 // 68???????? | // 6801000080 | push 0x80000001 // ff15???????? | // 68???????? | $sequence_4 = { 6801000080 ff15???????? 56 8d85f8feffff 50 } // n = 5, score = 1600 // 6801000080 | push 0x80000001 // ff15???????? | // 56 | push esi // 8d85f8feffff | lea eax, [ebp - 0x108] // 50 | push eax $sequence_5 = { 68???????? ffd6 8b45fc 85c0 } // n = 4, score = 1600 // 68???????? | // ffd6 | call esi // 8b45fc | mov eax, dword ptr [ebp - 4] // 85c0 | test eax, eax $sequence_6 = { 3b0d???????? 7502 f3c3 e9???????? e8???????? e9???????? 6a14 } // n = 7, score = 1600 // 3b0d???????? | // 7502 | jne 4 // f3c3 | ret // e9???????? | // e8???????? | // e9???????? | // 6a14 | push 0x14 $sequence_7 = { ff15???????? 6a00 6800000004 6a00 } // n = 4, score = 1600 // ff15???????? | // 6a00 | push 0 // 6800000004 | push 0x4000000 // 6a00 | push 0 $sequence_8 = { 5e 5b 5d c3 c60200 } // n = 5, score = 1400 // 5e | pop esi // 5b | pop ebx // 5d | pop ebp // c3 | ret // c60200 | mov byte ptr [edx], 0 $sequence_9 = { eb0d 803800 7408 8a5a01 42 84db } // n = 6, score = 1400 // eb0d | jmp 0xf // 803800 | cmp byte ptr [eax], 0 // 7408 | je 0xa // 8a5a01 | mov bl, byte ptr [edx + 1] // 42 | inc edx // 84db | test bl, bl $sequence_10 = { 3acb 740a 8a4801 40 } // n = 4, score = 1400 // 3acb | cmp cl, bl // 740a | je 0xc // 8a4801 | mov cl, byte ptr [eax + 1] // 40 | inc eax $sequence_11 = { 8bec 51 56 8b35???????? 6a00 6a00 6a00 } // n = 7, score = 1400 // 8bec | mov ebp, esp // 51 | push ecx // 56 | push esi // 8b35???????? | // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 $sequence_12 = { 8bd8 68???????? 53 ff15???????? 6a00 6a00 6a00 } // n = 7, score = 1400 // 8bd8 | mov ebx, eax // 68???????? | // 53 | push ebx // ff15???????? | // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 $sequence_13 = { 40 84c9 75f4 eb0d 803800 7408 } // n = 6, score = 1400 // 40 | inc eax // 84c9 | test cl, cl // 75f4 | jne 0xfffffff6 // eb0d | jmp 0xf // 803800 | cmp byte ptr [eax], 0 // 7408 | je 0xa $sequence_14 = { 50 50 50 50 8d45fc 50 6a00 } // n = 7, score = 1400 // 50 | push eax // 50 | push eax // 50 | push eax // 50 | push eax // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // 6a00 | push 0 $sequence_15 = { 56 ff15???????? 8b85b8f7ffff 85c0 75b6 } // n = 5, score = 1200 // 56 | push esi // ff15???????? | // 8b85b8f7ffff | mov eax, dword ptr [ebp - 0x848] // 85c0 | test eax, eax // 75b6 | jne 0xffffffb8 $sequence_16 = { 8d85b8f7ffff 50 6800080000 8d85bcf7ffff 50 56 ff15???????? } // n = 7, score = 1200 // 8d85b8f7ffff | lea eax, [ebp - 0x848] // 50 | push eax // 6800080000 | push 0x800 // 8d85bcf7ffff | lea eax, [ebp - 0x844] // 50 | push eax // 56 | push esi // ff15???????? | $sequence_17 = { 6a03 68000000c0 ffb5b0f7ffff ff15???????? } // n = 4, score = 1200 // 6a03 | push 3 // 68000000c0 | push 0xc0000000 // ffb5b0f7ffff | push dword ptr [ebp - 0x850] // ff15???????? | $sequence_18 = { ff5210 8b17 8bcf ff5208 } // n = 4, score = 1100 // ff5210 | call dword ptr [edx + 0x10] // 8b17 | mov edx, dword ptr [edi] // 8bcf | mov ecx, edi // ff5208 | call dword ptr [edx + 8] $sequence_19 = { ff5004 8b46f8 0346f4 57 ff7508 } // n = 5, score = 1100 // ff5004 | call dword ptr [eax + 4] // 8b46f8 | mov eax, dword ptr [esi - 8] // 0346f4 | add eax, dword ptr [esi - 0xc] // 57 | push edi // ff7508 | push dword ptr [ebp + 8] $sequence_20 = { 8b03 8d8df8fbffff 51 ffb5f0fbffff } // n = 4, score = 1100 // 8b03 | mov eax, dword ptr [ebx] // 8d8df8fbffff | lea ecx, [ebp - 0x408] // 51 | push ecx // ffb5f0fbffff | push dword ptr [ebp - 0x410] $sequence_21 = { 8d8dfcfbffff 51 ffb5f0fbffff 8bcb } // n = 4, score = 1100 // 8d8dfcfbffff | lea ecx, [ebp - 0x404] // 51 | push ecx // ffb5f0fbffff | push dword ptr [ebp - 0x410] // 8bcb | mov ecx, ebx $sequence_22 = { 8b35???????? ffd6 ff7704 ffd6 ff770c ffd6 ff7708 } // n = 7, score = 1100 // 8b35???????? | // ffd6 | call esi // ff7704 | push dword ptr [edi + 4] // ffd6 | call esi // ff770c | push dword ptr [edi + 0xc] // ffd6 | call esi // ff7708 | push dword ptr [edi + 8] $sequence_23 = { 85c9 7412 8b01 52 8d95f0fdffff } // n = 5, score = 1100 // 85c9 | test ecx, ecx // 7412 | je 0x14 // 8b01 | mov eax, dword ptr [ecx] // 52 | push edx // 8d95f0fdffff | lea edx, [ebp - 0x210] $sequence_24 = { e8???????? 83c41c 895ef8 897ef0 5b 5f } // n = 6, score = 1100 // e8???????? | // 83c41c | add esp, 0x1c // 895ef8 | mov dword ptr [esi - 8], ebx // 897ef0 | mov dword ptr [esi - 0x10], edi // 5b | pop ebx // 5f | pop edi $sequence_25 = { 8b95ecfdffff 03fa 8bb5e8fdffff 3bf7 } // n = 4, score = 1100 // 8b95ecfdffff | mov edx, dword ptr [ebp - 0x214] // 03fa | add edi, edx // 8bb5e8fdffff | mov esi, dword ptr [ebp - 0x218] // 3bf7 | cmp esi, edi $sequence_26 = { 750b 68???????? ff15???????? ff35???????? } // n = 4, score = 400 // 750b | jne 0xd // 68???????? | // ff15???????? | // ff35???????? | $sequence_27 = { 68???????? ff15???????? c20800 53 8b1d???????? } // n = 5, score = 400 // 68???????? | // ff15???????? | // c20800 | ret 8 // 53 | push ebx // 8b1d???????? | $sequence_28 = { c705????????03000000 c705????????00000000 c705????????04000000 ff15???????? 85c0 750b } // n = 6, score = 400 // c705????????03000000 | // c705????????00000000 | // c705????????04000000 | // ff15???????? | // 85c0 | test eax, eax // 750b | jne 0xd $sequence_29 = { ffd3 8b3d???????? 85c0 7507 68???????? } // n = 5, score = 400 // ffd3 | call ebx // 8b3d???????? | // 85c0 | test eax, eax // 7507 | jne 9 // 68???????? | $sequence_30 = { 7507 68???????? ffd7 6a00 6a00 6a01 6a00 } // n = 7, score = 400 // 7507 | jne 9 // 68???????? | // ffd7 | call edi // 6a00 | push 0 // 6a00 | push 0 // 6a01 | push 1 // 6a00 | push 0 $sequence_31 = { c705????????02000000 c705????????00000000 c705????????00000000 c705????????00000000 ffd3 8b3d???????? } // n = 6, score = 400 // c705????????02000000 | // c705????????00000000 | // c705????????00000000 | // c705????????00000000 | // ffd3 | call ebx // 8b3d???????? | $sequence_32 = { 68???????? 68???????? ff15???????? a3???????? 85c0 750e 68???????? } // n = 7, score = 400 // 68???????? | // 68???????? | // ff15???????? | // a3???????? | // 85c0 | test eax, eax // 750e | jne 0x10 // 68???????? | $sequence_33 = { 8bec ff4d08 755d 833d????????04 } // n = 4, score = 400 // 8bec | mov ebp, esp // ff4d08 | dec dword ptr [ebp + 8] // 755d | jne 0x5f // 833d????????04 | $sequence_34 = { ff15???????? 68c0d40100 ff15???????? e9???????? } // n = 4, score = 400 // ff15???????? | // 68c0d40100 | push 0x1d4c0 // ff15???????? | // e9???????? | $sequence_35 = { 0fbf45f0 3b85c8feffff 7e0c c785c4feffff01000000 eb0a c785c4feffff00000000 8b0d???????? } // n = 7, score = 100 // 0fbf45f0 | movsx eax, word ptr [ebp - 0x10] // 3b85c8feffff | cmp eax, dword ptr [ebp - 0x138] // 7e0c | jle 0xe // c785c4feffff01000000 | mov dword ptr [ebp - 0x13c], 1 // eb0a | jmp 0xc // c785c4feffff00000000 | mov dword ptr [ebp - 0x13c], 0 // 8b0d???????? | $sequence_36 = { d3f8 2305???????? a3???????? 837de800 7418 0fbe4dfe 0fbe55ff } // n = 7, score = 100 // d3f8 | sar eax, cl // 2305???????? | // a3???????? | // 837de800 | cmp dword ptr [ebp - 0x18], 0 // 7418 | je 0x1a // 0fbe4dfe | movsx ecx, byte ptr [ebp - 2] // 0fbe55ff | movsx edx, byte ptr [ebp - 1] $sequence_37 = { 890d???????? 0fb655fa 8bc2 0faf05???????? 99 b98c020000 f7f9 } // n = 7, score = 100 // 890d???????? | // 0fb655fa | movzx edx, byte ptr [ebp - 6] // 8bc2 | mov eax, edx // 0faf05???????? | // 99 | cdq // b98c020000 | mov ecx, 0x28c // f7f9 | idiv ecx $sequence_38 = { 8d85e4f7ffff 50 8b4df8 51 ff15???????? 8945e8 837de800 } // n = 7, score = 100 // 8d85e4f7ffff | lea eax, [ebp - 0x81c] // 50 | push eax // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 51 | push ecx // ff15???????? | // 8945e8 | mov dword ptr [ebp - 0x18], eax // 837de800 | cmp dword ptr [ebp - 0x18], 0 $sequence_39 = { d3e2 3355e8 2315???????? 8915???????? a1???????? 0faf45e8 } // n = 6, score = 100 // d3e2 | shl edx, cl // 3355e8 | xor edx, dword ptr [ebp - 0x18] // 2315???????? | // 8915???????? | // a1???????? | // 0faf45e8 | imul eax, dword ptr [ebp - 0x18] condition: 7 of them and filesize < 70128640 }
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