Actor(s): Silence group
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rule win_silence_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-10-14" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.5.0" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.silence" malpedia_rule_date = "20201014" malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9" malpedia_version = "20201014" 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 = { 8a4801 40 84c9 75f4 eb05 803800 } // n = 6, score = 1000 // 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_1 = { 8d45fc 50 6a00 6a00 68???????? c745fc00000000 } // n = 6, score = 1000 // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 // 68???????? | // c745fc00000000 | mov dword ptr [ebp - 4], 0 $sequence_2 = { 8d95f0fdffff 52 ff10 8b95ecfdffff 03fa 8bb5e8fdffff 3bf7 } // n = 7, score = 900 // 8d95f0fdffff | lea edx, [ebp - 0x210] // 52 | push edx // ff10 | call dword ptr [eax] // 8b95ecfdffff | mov edx, dword ptr [ebp - 0x214] // 03fa | add edi, edx // 8bb5e8fdffff | mov esi, dword ptr [ebp - 0x218] // 3bf7 | cmp esi, edi $sequence_3 = { 8b17 8bcf ff5210 8b17 8bcf } // n = 5, score = 900 // 8b17 | mov edx, dword ptr [edi] // 8bcf | mov ecx, edi // ff5210 | call dword ptr [edx + 0x10] // 8b17 | mov edx, dword ptr [edi] // 8bcf | mov ecx, edi $sequence_4 = { e8???????? ff37 8b35???????? ffd6 } // n = 4, score = 900 // e8???????? | // ff37 | push dword ptr [edi] // 8b35???????? | // ffd6 | call esi $sequence_5 = { e8???????? cc 8325????????00 c3 6a08 68???????? } // n = 6, score = 900 // e8???????? | // cc | int3 // 8325????????00 | // c3 | ret // 6a08 | push 8 // 68???????? | $sequence_6 = { 51 ffb5f0fbffff 8bcb ff5038 85c0 } // n = 5, score = 900 // 51 | push ecx // ffb5f0fbffff | push dword ptr [ebp - 0x410] // 8bcb | mov ecx, ebx // ff5038 | call dword ptr [eax + 0x38] // 85c0 | test eax, eax $sequence_7 = { e8???????? 83c41c 895ef8 897ef0 5b } // n = 5, score = 900 // e8???????? | // 83c41c | add esp, 0x1c // 895ef8 | mov dword ptr [esi - 8], ebx // 897ef0 | mov dword ptr [esi - 0x10], edi // 5b | pop ebx $sequence_8 = { 7412 8b01 52 8d95f0fdffff 52 } // n = 5, score = 900 // 7412 | je 0x14 // 8b01 | mov eax, dword ptr [ecx] // 52 | push edx // 8d95f0fdffff | lea edx, [ebp - 0x210] // 52 | push edx $sequence_9 = { 50 683f020f00 6a00 68???????? 6801000080 ff15???????? 68???????? } // n = 7, score = 900 // 50 | push eax // 683f020f00 | push 0xf023f // 6a00 | push 0 // 68???????? | // 6801000080 | push 0x80000001 // ff15???????? | // 68???????? | $sequence_10 = { ff7704 ffd6 ff770c ffd6 ff7708 } // n = 5, score = 900 // 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_11 = { 8b01 ff5004 8b46f8 0346f4 57 ff7508 } // n = 6, score = 900 // 8b01 | mov eax, dword ptr [ecx] // 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_12 = { ff15???????? 6a00 6800000004 6a00 6a00 } // n = 5, score = 900 // ff15???????? | // 6a00 | push 0 // 6800000004 | push 0x4000000 // 6a00 | push 0 // 6a00 | push 0 $sequence_13 = { 8bd8 68???????? 53 ff15???????? 6a00 6a00 6a00 } // n = 7, score = 800 // 8bd8 | mov ebx, eax // 68???????? | // 53 | push ebx // ff15???????? | // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 $sequence_14 = { 5e 5b 5d c3 c60200 42 } // n = 6, score = 800 // 5e | pop esi // 5b | pop ebx // 5d | pop ebp // c3 | ret // c60200 | mov byte ptr [edx], 0 // 42 | inc edx $sequence_15 = { 3acb 740a 8a4801 40 } // n = 4, score = 800 // 3acb | cmp cl, bl // 740a | je 0xc // 8a4801 | mov cl, byte ptr [eax + 1] // 40 | inc eax $sequence_16 = { ff30 c745fc00000000 57 ff15???????? } // n = 4, score = 800 // ff30 | push dword ptr [eax] // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 57 | push edi // ff15???????? | $sequence_17 = { f3c3 e9???????? e8???????? e9???????? 6a14 } // n = 5, score = 800 // f3c3 | ret // e9???????? | // e8???????? | // e9???????? | // 6a14 | push 0x14 $sequence_18 = { 6801000080 ff15???????? 56 8d85f8feffff } // n = 4, score = 800 // 6801000080 | push 0x80000001 // ff15???????? | // 56 | push esi // 8d85f8feffff | lea eax, [ebp - 0x108] $sequence_19 = { 68???????? ffd6 8b45fc 85c0 } // n = 4, score = 800 // 68???????? | // ffd6 | call esi // 8b45fc | mov eax, dword ptr [ebp - 4] // 85c0 | test eax, eax $sequence_20 = { 46 56 8d85f8feffff 50 6a01 } // n = 5, score = 800 // 46 | inc esi // 56 | push esi // 8d85f8feffff | lea eax, [ebp - 0x108] // 50 | push eax // 6a01 | push 1 $sequence_21 = { 803800 7408 8a5a01 42 84db } // n = 5, score = 800 // 803800 | cmp byte ptr [eax], 0 // 7408 | je 0xa // 8a5a01 | mov bl, byte ptr [edx + 1] // 42 | inc edx // 84db | test bl, bl $sequence_22 = { 6a00 57 ff15???????? 8d45fc 50 } // n = 5, score = 800 // 6a00 | push 0 // 57 | push edi // ff15???????? | // 8d45fc | lea eax, [ebp - 4] // 50 | push eax $sequence_23 = { 84c9 75f4 eb0d 803800 } // n = 4, score = 800 // 84c9 | test cl, cl // 75f4 | jne 0xfffffff6 // eb0d | jmp 0xf // 803800 | cmp byte ptr [eax], 0 $sequence_24 = { 8d85bcf7ffff 50 56 ff15???????? } // n = 4, score = 600 // 8d85bcf7ffff | lea eax, [ebp - 0x844] // 50 | push eax // 56 | push esi // ff15???????? | $sequence_25 = { ff15???????? 8d85b8f7ffff 50 6800080000 8d85bcf7ffff } // n = 5, score = 600 // ff15???????? | // 8d85b8f7ffff | lea eax, [ebp - 0x848] // 50 | push eax // 6800080000 | push 0x800 // 8d85bcf7ffff | lea eax, [ebp - 0x844] $sequence_26 = { 8d45f0 50 b901000000 ba04000000 } // n = 4, score = 300 // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax // b901000000 | mov ecx, 1 // ba04000000 | mov edx, 4 $sequence_27 = { 8bec ff4d08 755d 833d????????04 7554 } // n = 5, score = 300 // 8bec | mov ebp, esp // ff4d08 | dec dword ptr [ebp + 8] // 755d | jne 0x5f // 833d????????04 | // 7554 | jne 0x56 $sequence_28 = { 31db 89c1 dd4508 d88b74914100 83ec08 df3c24 9b } // n = 7, score = 300 // 31db | xor ebx, ebx // 89c1 | mov ecx, eax // dd4508 | fld qword ptr [ebp + 8] // d88b74914100 | fmul dword ptr [ebx + 0x419174] // 83ec08 | sub esp, 8 // df3c24 | fistp qword ptr [esp] // 9b | wait $sequence_29 = { 8d55f0 8b400c 8b00 e8???????? 33c0 } // n = 5, score = 300 // 8d55f0 | lea edx, [ebp - 0x10] // 8b400c | mov eax, dword ptr [eax + 0xc] // 8b00 | mov eax, dword ptr [eax] // e8???????? | // 33c0 | xor eax, eax $sequence_30 = { c705????????04000000 ff15???????? 85c0 750b 68???????? ff15???????? } // n = 6, score = 300 // c705????????04000000 | // ff15???????? | // 85c0 | test eax, eax // 750b | jne 0xd // 68???????? | // ff15???????? | $sequence_31 = { ff15???????? 68c0d40100 ff15???????? e9???????? } // n = 4, score = 300 // ff15???????? | // 68c0d40100 | push 0x1d4c0 // ff15???????? | // e9???????? | $sequence_32 = { 83ef05 7c29 47 8db504fcffff 8d85bcf7ffff } // n = 5, score = 300 // 83ef05 | sub edi, 5 // 7c29 | jl 0x2b // 47 | inc edi // 8db504fcffff | lea esi, [ebp - 0x3fc] // 8d85bcf7ffff | lea eax, [ebp - 0x844] $sequence_33 = { 5a e8???????? 84c0 740c e8???????? } // n = 5, score = 300 // 5a | pop edx // e8???????? | // 84c0 | test al, al // 740c | je 0xe // e8???????? | $sequence_34 = { 8b8e00000001 8b44d604 03c9 8944ce08 8b8600000001 8944d604 } // n = 6, score = 300 // 8b8e00000001 | mov ecx, dword ptr [esi + 0x1000000] // 8b44d604 | mov eax, dword ptr [esi + edx*8 + 4] // 03c9 | add ecx, ecx // 8944ce08 | mov dword ptr [esi + ecx*8 + 8], eax // 8b8600000001 | mov eax, dword ptr [esi + 0x1000000] // 8944d604 | mov dword ptr [esi + edx*8 + 4], eax $sequence_35 = { 53 8b1d???????? 57 0f57c0 } // n = 4, score = 300 // 53 | push ebx // 8b1d???????? | // 57 | push edi // 0f57c0 | xorps xmm0, xmm0 $sequence_36 = { ff15???????? 33d2 55 68???????? 64ff32 648922 } // n = 6, score = 300 // ff15???????? | // 33d2 | xor edx, edx // 55 | push ebp // 68???????? | // 64ff32 | push dword ptr fs:[edx] // 648922 | mov dword ptr fs:[edx], esp $sequence_37 = { 68???????? 68???????? ff15???????? a3???????? 85c0 750e 68???????? } // n = 7, score = 300 // 68???????? | // 68???????? | // ff15???????? | // a3???????? | // 85c0 | test eax, eax // 750e | jne 0x10 // 68???????? | $sequence_38 = { c705????????02000000 c705????????00000000 c705????????00000000 c705????????00000000 ffd3 8b3d???????? } // n = 6, score = 300 // c705????????02000000 | // c705????????00000000 | // c705????????00000000 | // c705????????00000000 | // ffd3 | call ebx // 8b3d???????? | $sequence_39 = { 75f1 83fb06 7f15 8b0cdd1c924100 b201 } // n = 5, score = 300 // 75f1 | jne 0xfffffff3 // 83fb06 | cmp ebx, 6 // 7f15 | jg 0x17 // 8b0cdd1c924100 | mov ecx, dword ptr [ebx*8 + 0x41921c] // b201 | mov dl, 1 $sequence_40 = { ffd3 8b3d???????? 85c0 7507 68???????? ffd7 6a00 } // n = 7, score = 300 // ffd3 | call ebx // 8b3d???????? | // 85c0 | test eax, eax // 7507 | jne 9 // 68???????? | // ffd7 | call edi // 6a00 | push 0 $sequence_41 = { 6a07 33c9 8b5340 8d85ccfbffff } // n = 4, score = 300 // 6a07 | push 7 // 33c9 | xor ecx, ecx // 8b5340 | mov edx, dword ptr [ebx + 0x40] // 8d85ccfbffff | lea eax, [ebp - 0x434] $sequence_42 = { 750e 68???????? ff15???????? c20800 53 8b1d???????? } // n = 6, score = 300 // 750e | jne 0x10 // 68???????? | // ff15???????? | // c20800 | ret 8 // 53 | push ebx // 8b1d???????? | $sequence_43 = { 50 6a00 ff15???????? 6a00 6a00 68???????? ff15???????? } // n = 7, score = 200 // 50 | push eax // 6a00 | push 0 // ff15???????? | // 6a00 | push 0 // 6a00 | push 0 // 68???????? | // ff15???????? | $sequence_44 = { b801000000 668945f2 eb06 33c9 66894df2 668b55f2 } // n = 6, score = 100 // b801000000 | mov eax, 1 // 668945f2 | mov word ptr [ebp - 0xe], ax // eb06 | jmp 8 // 33c9 | xor ecx, ecx // 66894df2 | mov word ptr [ebp - 0xe], cx // 668b55f2 | mov dx, word ptr [ebp - 0xe] $sequence_45 = { 8b55e8 3b15???????? 740c c78544ffffff01000000 eb0a } // n = 5, score = 100 // 8b55e8 | mov edx, dword ptr [ebp - 0x18] // 3b15???????? | // 740c | je 0xe // c78544ffffff01000000 | mov dword ptr [ebp - 0xbc], 1 // eb0a | jmp 0xc $sequence_46 = { 3b55e8 0f850d030000 0fbf05???????? 85c0 0f84fe020000 } // n = 5, score = 100 // 3b55e8 | cmp edx, dword ptr [ebp - 0x18] // 0f850d030000 | jne 0x313 // 0fbf05???????? | // 85c0 | test eax, eax // 0f84fe020000 | je 0x304 $sequence_47 = { a1???????? 0faf45f4 33d2 b950000000 } // n = 4, score = 100 // a1???????? | // 0faf45f4 | imul eax, dword ptr [ebp - 0xc] // 33d2 | xor edx, edx // b950000000 | mov ecx, 0x50 $sequence_48 = { eb0a c78548ffffff01000000 a1???????? 338548ffffff a3???????? } // n = 5, score = 100 // eb0a | jmp 0xc // c78548ffffff01000000 | mov dword ptr [ebp - 0xb8], 1 // a1???????? | // 338548ffffff | xor eax, dword ptr [ebp - 0xb8] // a3???????? | condition: 7 of them and filesize < 70128640 }
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