Actor(s): Silence group
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rule win_silence_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "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 = { e8???????? cc 8325????????00 c3 6a08 68???????? e8???????? } // n = 7, score = 1800 // e8???????? | // cc | int3 // 8325????????00 | // c3 | ret // 6a08 | push 8 // 68???????? | // e8???????? | $sequence_1 = { 40 84c9 75f4 eb05 803800 } // n = 5, score = 1800 // 40 | inc eax // 84c9 | test cl, cl // 75f4 | jne 0xfffffff6 // eb05 | jmp 7 // 803800 | cmp byte ptr [eax], 0 $sequence_2 = { 8d45fc 50 6a00 6a00 68???????? c745fc00000000 } // n = 6, score = 1800 // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 // 68???????? | // c745fc00000000 | mov dword ptr [ebp - 4], 0 $sequence_3 = { 683f020f00 6a00 68???????? 6801000080 ff15???????? 68???????? } // n = 6, score = 1700 // 683f020f00 | push 0xf023f // 6a00 | push 0 // 68???????? | // 6801000080 | push 0x80000001 // ff15???????? | // 68???????? | $sequence_4 = { 46 56 8d85f8feffff 50 } // n = 4, score = 1600 // 46 | inc esi // 56 | push esi // 8d85f8feffff | lea eax, [ebp - 0x108] // 50 | push eax $sequence_5 = { f3c3 e9???????? e8???????? e9???????? 6a14 68???????? } // n = 6, score = 1600 // f3c3 | ret // e9???????? | // e8???????? | // e9???????? | // 6a14 | push 0x14 // 68???????? | $sequence_6 = { 68???????? ffd6 8b45fc 85c0 } // n = 4, score = 1600 // 68???????? | // ffd6 | call esi // 8b45fc | mov eax, dword ptr [ebp - 4] // 85c0 | test eax, eax $sequence_7 = { 6801000080 ff15???????? 56 8d85f8feffff } // n = 4, score = 1600 // 6801000080 | push 0x80000001 // ff15???????? | // 56 | push esi // 8d85f8feffff | lea eax, [ebp - 0x108] $sequence_8 = { ff15???????? 6a00 6800000004 6a00 } // n = 4, score = 1600 // ff15???????? | // 6a00 | push 0 // 6800000004 | push 0x4000000 // 6a00 | push 0 $sequence_9 = { 8bd8 68???????? 53 ff15???????? 6a00 6a00 } // n = 6, score = 1400 // 8bd8 | mov ebx, eax // 68???????? | // 53 | push ebx // ff15???????? | // 6a00 | push 0 // 6a00 | push 0 $sequence_10 = { 7408 8a5a01 42 84db } // n = 4, score = 1400 // 7408 | je 0xa // 8a5a01 | mov bl, byte ptr [edx + 1] // 42 | inc edx // 84db | test bl, bl $sequence_11 = { 75f4 eb0d 803800 7408 8a5a01 } // n = 5, score = 1400 // 75f4 | jne 0xfffffff6 // eb0d | jmp 0xf // 803800 | cmp byte ptr [eax], 0 // 7408 | je 0xa // 8a5a01 | mov bl, byte ptr [edx + 1] $sequence_12 = { 8b35???????? 6a00 6a00 6a00 6a00 8d45fc } // n = 6, score = 1400 // 8b35???????? | // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 8d45fc | lea eax, [ebp - 4] $sequence_13 = { 5b 5d c3 c60200 42 } // n = 5, score = 1400 // 5b | pop ebx // 5d | pop ebp // c3 | ret // c60200 | mov byte ptr [edx], 0 // 42 | inc edx $sequence_14 = { 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_15 = { 8d85bcf7ffff 50 56 ff15???????? 8b85b8f7ffff } // n = 5, score = 1200 // 8d85bcf7ffff | lea eax, [ebp - 0x844] // 50 | push eax // 56 | push esi // ff15???????? | // 8b85b8f7ffff | mov eax, dword ptr [ebp - 0x848] $sequence_16 = { 6a03 68000000c0 ffb5b0f7ffff ff15???????? } // n = 4, score = 1200 // 6a03 | push 3 // 68000000c0 | push 0xc0000000 // ffb5b0f7ffff | push dword ptr [ebp - 0x850] // ff15???????? | $sequence_17 = { e8???????? ff37 8b35???????? ffd6 ff7704 ffd6 ff770c } // n = 7, score = 1100 // e8???????? | // ff37 | push dword ptr [edi] // 8b35???????? | // ffd6 | call esi // ff7704 | push dword ptr [edi + 4] // ffd6 | call esi // ff770c | push dword ptr [edi + 0xc] $sequence_18 = { 898df8fbffff 8d8dfcfbffff 51 ffb5f0fbffff 8bcb ff5038 85c0 } // n = 7, score = 1100 // 898df8fbffff | mov dword ptr [ebp - 0x408], ecx // 8d8dfcfbffff | lea ecx, [ebp - 0x404] // 51 | push ecx // ffb5f0fbffff | push dword ptr [ebp - 0x410] // 8bcb | mov ecx, ebx // ff5038 | call dword ptr [eax + 0x38] // 85c0 | test eax, eax $sequence_19 = { ff10 8b95ecfdffff 03fa 8bb5e8fdffff } // n = 4, score = 1100 // ff10 | call dword ptr [eax] // 8b95ecfdffff | mov edx, dword ptr [ebp - 0x214] // 03fa | add edi, edx // 8bb5e8fdffff | mov esi, dword ptr [ebp - 0x218] $sequence_20 = { 8b17 8bcf ff5210 8b17 8bcf } // n = 5, score = 1100 // 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_21 = { 8b46f8 0346f4 57 ff7508 50 e8???????? } // n = 6, score = 1100 // 8b46f8 | mov eax, dword ptr [esi - 8] // 0346f4 | add eax, dword ptr [esi - 0xc] // 57 | push edi // ff7508 | push dword ptr [ebp + 8] // 50 | push eax // e8???????? | $sequence_22 = { 895ef8 897ef0 5b 5f 5e } // n = 5, score = 1100 // 895ef8 | mov dword ptr [esi - 8], ebx // 897ef0 | mov dword ptr [esi - 0x10], edi // 5b | pop ebx // 5f | pop edi // 5e | pop esi $sequence_23 = { 53 e8???????? 8b4ef4 8bc7 2bc1 } // n = 5, score = 1100 // 53 | push ebx // e8???????? | // 8b4ef4 | mov ecx, dword ptr [esi - 0xc] // 8bc7 | mov eax, edi // 2bc1 | sub eax, ecx $sequence_24 = { e8???????? ff76f8 e8???????? 83c41c 895ef8 897ef0 } // n = 6, score = 1100 // e8???????? | // ff76f8 | push dword ptr [esi - 8] // e8???????? | // 83c41c | add esp, 0x1c // 895ef8 | mov dword ptr [esi - 8], ebx // 897ef0 | mov dword ptr [esi - 0x10], edi $sequence_25 = { ff4d08 755d 833d????????04 7554 } // n = 4, score = 400 // ff4d08 | dec dword ptr [ebp + 8] // 755d | jne 0x5f // 833d????????04 | // 7554 | jne 0x56 $sequence_26 = { ff15???????? 85c0 750b 68???????? ff15???????? ff35???????? } // n = 6, score = 400 // ff15???????? | // 85c0 | test eax, eax // 750b | jne 0xd // 68???????? | // ff15???????? | // ff35???????? | $sequence_27 = { c705????????00000000 c705????????02000000 c705????????00000000 c705????????00000000 c705????????00000000 ffd3 8b3d???????? } // n = 7, score = 400 // c705????????00000000 | // c705????????02000000 | // c705????????00000000 | // c705????????00000000 | // c705????????00000000 | // ffd3 | call ebx // 8b3d???????? | $sequence_28 = { 68???????? ff15???????? a3???????? 85c0 750e 68???????? } // n = 6, score = 400 // 68???????? | // ff15???????? | // a3???????? | // 85c0 | test eax, eax // 750e | jne 0x10 // 68???????? | $sequence_29 = { 7507 68???????? ffd7 6a00 6a00 6a01 } // n = 6, score = 400 // 7507 | jne 9 // 68???????? | // ffd7 | call edi // 6a00 | push 0 // 6a00 | push 0 // 6a01 | push 1 $sequence_30 = { c705????????00000000 ffd3 8b3d???????? 85c0 7507 68???????? ffd7 } // n = 7, score = 400 // c705????????00000000 | // ffd3 | call ebx // 8b3d???????? | // 85c0 | test eax, eax // 7507 | jne 9 // 68???????? | // ffd7 | call edi $sequence_31 = { ff15???????? 68c0d40100 ff15???????? e9???????? } // n = 4, score = 400 // ff15???????? | // 68c0d40100 | push 0x1d4c0 // ff15???????? | // e9???????? | $sequence_32 = { 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_33 = { ff15???????? c20800 53 8b1d???????? } // n = 4, score = 400 // ff15???????? | // c20800 | ret 8 // 53 | push ebx // 8b1d???????? | $sequence_34 = { c745b801000000 eb07 c745b800000000 8b45e4 2345b8 7509 c745b400000000 } // n = 7, score = 100 // c745b801000000 | mov dword ptr [ebp - 0x48], 1 // eb07 | jmp 9 // c745b800000000 | mov dword ptr [ebp - 0x48], 0 // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 2345b8 | and eax, dword ptr [ebp - 0x48] // 7509 | jne 0xb // c745b400000000 | mov dword ptr [ebp - 0x4c], 0 $sequence_35 = { 8b4df0 d3e2 3bc2 750c c7853cffffff01000000 eb0a } // n = 6, score = 100 // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // d3e2 | shl edx, cl // 3bc2 | cmp eax, edx // 750c | jne 0xe // c7853cffffff01000000 | mov dword ptr [ebp - 0xc4], 1 // eb0a | jmp 0xc $sequence_36 = { 83c40c 8d85f8fcffff 50 ff15???????? b901000000 6bd100 8b45f4 } // n = 7, score = 100 // 83c40c | add esp, 0xc // 8d85f8fcffff | lea eax, [ebp - 0x308] // 50 | push eax // ff15???????? | // b901000000 | mov ecx, 1 // 6bd100 | imul edx, ecx, 0 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] $sequence_37 = { 8bec 83ec44 56 c745e8a3000000 c745d847000000 c645fb05 } // n = 6, score = 100 // 8bec | mov ebp, esp // 83ec44 | sub esp, 0x44 // 56 | push esi // c745e8a3000000 | mov dword ptr [ebp - 0x18], 0xa3 // c745d847000000 | mov dword ptr [ebp - 0x28], 0x47 // c645fb05 | mov byte ptr [ebp - 5], 5 $sequence_38 = { 0fbe55fe 85d2 7513 0fbf45f4 0fbf0d???????? 3bc1 0f85b8020000 } // n = 7, score = 100 // 0fbe55fe | movsx edx, byte ptr [ebp - 2] // 85d2 | test edx, edx // 7513 | jne 0x15 // 0fbf45f4 | movsx eax, word ptr [ebp - 0xc] // 0fbf0d???????? | // 3bc1 | cmp eax, ecx // 0f85b8020000 | jne 0x2be $sequence_39 = { 50 68???????? 6a00 6a00 ff15???????? 68b80b0000 ff15???????? } // n = 7, score = 100 // 50 | push eax // 68???????? | // 6a00 | push 0 // 6a00 | push 0 // ff15???????? | // 68b80b0000 | push 0xbb8 // ff15???????? | condition: 7 of them and filesize < 70128640 }
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