Actor(s): Silence group
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rule win_silence_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-06-10" 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 = "20210604" malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd" malpedia_version = "20210616" 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 = { 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_1 = { cc 8325????????00 c3 6a08 } // n = 4, score = 1800 // cc | int3 // 8325????????00 | // c3 | ret // 6a08 | push 8 $sequence_2 = { 6a00 8d45fc 50 6a00 6a00 68???????? c745fc00000000 } // n = 7, score = 1800 // 6a00 | push 0 // 8d45fc | lea eax, dword ptr [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 = { 68???????? ffd6 8b45fc 85c0 } // n = 4, score = 1600 // 68???????? | // ffd6 | call esi // 8b45fc | mov eax, dword ptr [ebp - 4] // 85c0 | test eax, eax $sequence_5 = { 7502 f3c3 e9???????? e8???????? e9???????? } // n = 5, score = 1600 // 7502 | jne 4 // f3c3 | ret // e9???????? | // e8???????? | // e9???????? | $sequence_6 = { 46 56 8d85f8feffff 50 6a01 } // n = 5, score = 1600 // 46 | inc esi // 56 | push esi // 8d85f8feffff | lea eax, dword ptr [ebp - 0x108] // 50 | push eax // 6a01 | push 1 $sequence_7 = { 6801000080 ff15???????? 56 8d85f8feffff } // n = 4, score = 1600 // 6801000080 | push 0x80000001 // ff15???????? | // 56 | push esi // 8d85f8feffff | lea eax, dword ptr [ebp - 0x108] $sequence_8 = { ff15???????? 6a00 6800000004 6a00 } // n = 4, score = 1600 // ff15???????? | // 6a00 | push 0 // 6800000004 | push 0x4000000 // 6a00 | push 0 $sequence_9 = { 5b 5d c3 c60200 } // n = 4, score = 1400 // 5b | pop ebx // 5d | pop ebp // c3 | ret // c60200 | mov byte ptr [edx], 0 $sequence_10 = { 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_11 = { 84c9 75f4 eb0d 803800 } // n = 4, score = 1400 // 84c9 | test cl, cl // 75f4 | jne 0xfffffff6 // eb0d | jmp 0xf // 803800 | cmp byte ptr [eax], 0 $sequence_12 = { 6a00 6a00 8bf8 6a00 57 ff15???????? 8d45fc } // n = 7, score = 1400 // 6a00 | push 0 // 6a00 | push 0 // 8bf8 | mov edi, eax // 6a00 | push 0 // 57 | push edi // ff15???????? | // 8d45fc | lea eax, dword ptr [ebp - 4] $sequence_13 = { 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_14 = { 6800080000 8d85bcf7ffff 50 56 ff15???????? 8b85b8f7ffff 85c0 } // n = 7, score = 1200 // 6800080000 | push 0x800 // 8d85bcf7ffff | lea eax, dword ptr [ebp - 0x844] // 50 | push eax // 56 | push esi // ff15???????? | // 8b85b8f7ffff | mov eax, dword ptr [ebp - 0x848] // 85c0 | test eax, eax $sequence_15 = { 8d8db4f7ffff 51 50 8d85bcf7ffff } // n = 4, score = 1200 // 8d8db4f7ffff | lea ecx, dword ptr [ebp - 0x84c] // 51 | push ecx // 50 | push eax // 8d85bcf7ffff | lea eax, dword ptr [ebp - 0x844] $sequence_16 = { 8b01 ff5004 8b46f8 0346f4 57 ff7508 50 } // n = 7, score = 1100 // 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] // 50 | push eax $sequence_17 = { 8d95f0fdffff 52 ff10 8b95ecfdffff 03fa } // n = 5, score = 1100 // 8d95f0fdffff | lea edx, dword ptr [ebp - 0x210] // 52 | push edx // ff10 | call dword ptr [eax] // 8b95ecfdffff | mov edx, dword ptr [ebp - 0x214] // 03fa | add edi, edx $sequence_18 = { 7412 8b01 52 8d95f0fdffff 52 } // n = 5, score = 1100 // 7412 | je 0x14 // 8b01 | mov eax, dword ptr [ecx] // 52 | push edx // 8d95f0fdffff | lea edx, dword ptr [ebp - 0x210] // 52 | push edx $sequence_19 = { 8bf9 e8???????? ff37 8b35???????? ffd6 ff7704 ffd6 } // n = 7, score = 1100 // 8bf9 | mov edi, ecx // e8???????? | // ff37 | push dword ptr [edi] // 8b35???????? | // ffd6 | call esi // ff7704 | push dword ptr [edi + 4] // ffd6 | call esi $sequence_20 = { 51 ffb5f0fbffff 8bcb ff5038 85c0 } // n = 5, score = 1100 // 51 | push ecx // ffb5f0fbffff | push dword ptr [ebp - 0x410] // 8bcb | mov ecx, ebx // ff5038 | call dword ptr [eax + 0x38] // 85c0 | test eax, eax $sequence_21 = { e8???????? 8b4ef4 8bc7 2bc1 } // n = 4, score = 1100 // e8???????? | // 8b4ef4 | mov ecx, dword ptr [esi - 0xc] // 8bc7 | mov eax, edi // 2bc1 | sub eax, ecx $sequence_22 = { 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_23 = { ff7704 ffd6 ff770c ffd6 ff7708 } // n = 5, score = 1100 // 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_24 = { ffd7 6a00 6a00 6a01 6a00 ff15???????? } // n = 6, score = 1000 // ffd7 | call edi // 6a00 | push 0 // 6a00 | push 0 // 6a01 | push 1 // 6a00 | push 0 // ff15???????? | $sequence_25 = { 660fd605???????? 660fd605???????? 50 c705????????00000000 c705????????10000000 c705????????00000000 } // n = 6, score = 1000 // 660fd605???????? | // 660fd605???????? | // 50 | push eax // c705????????00000000 | // c705????????10000000 | // c705????????00000000 | $sequence_26 = { c705????????04000000 c705????????00000000 c705????????00000000 ffd3 85c0 7507 } // n = 6, score = 400 // c705????????04000000 | // c705????????00000000 | // c705????????00000000 | // ffd3 | call ebx // 85c0 | test eax, eax // 7507 | jne 9 $sequence_27 = { ff15???????? 85c0 750b 68???????? ff15???????? ff35???????? } // n = 6, score = 400 // ff15???????? | // 85c0 | test eax, eax // 750b | jne 0xd // 68???????? | // ff15???????? | // ff35???????? | $sequence_28 = { c705????????00000000 ffd3 8b3d???????? 85c0 7507 } // n = 5, score = 400 // c705????????00000000 | // ffd3 | call ebx // 8b3d???????? | // 85c0 | test eax, eax // 7507 | jne 9 $sequence_29 = { 85c0 7507 68???????? ffd7 56 6a00 } // n = 6, score = 400 // 85c0 | test eax, eax // 7507 | jne 9 // 68???????? | // ffd7 | call edi // 56 | push esi // 6a00 | push 0 $sequence_30 = { 68???????? ff15???????? a3???????? 85c0 750e 68???????? ff15???????? } // n = 7, score = 400 // 68???????? | // ff15???????? | // a3???????? | // 85c0 | test eax, eax // 750e | jne 0x10 // 68???????? | // ff15???????? | $sequence_31 = { ff15???????? 68c0d40100 ff15???????? e9???????? } // n = 4, score = 400 // ff15???????? | // 68c0d40100 | push 0x1d4c0 // ff15???????? | // e9???????? | $sequence_32 = { c705????????00000000 c705????????03000000 ffd3 5e 85c0 } // n = 5, score = 400 // c705????????00000000 | // c705????????03000000 | // ffd3 | call ebx // 5e | pop esi // 85c0 | test eax, eax $sequence_33 = { 50 6a00 ff15???????? 6a00 6a00 68???????? } // n = 6, score = 200 // 50 | push eax // 6a00 | push 0 // ff15???????? | // 6a00 | push 0 // 6a00 | push 0 // 68???????? | $sequence_34 = { 3b55e8 0f84dc010000 0fb605???????? 0fbe4dff 034df0 3bc1 } // n = 6, score = 100 // 3b55e8 | cmp edx, dword ptr [ebp - 0x18] // 0f84dc010000 | je 0x1e2 // 0fb605???????? | // 0fbe4dff | movsx ecx, byte ptr [ebp - 1] // 034df0 | add ecx, dword ptr [ebp - 0x10] // 3bc1 | cmp eax, ecx $sequence_35 = { 8b5594 3b5590 0f8494020000 0fbf45ec 85c0 } // n = 5, score = 100 // 8b5594 | mov edx, dword ptr [ebp - 0x6c] // 3b5590 | cmp edx, dword ptr [ebp - 0x70] // 0f8494020000 | je 0x29a // 0fbf45ec | movsx eax, word ptr [ebp - 0x14] // 85c0 | test eax, eax $sequence_36 = { 33d0 7418 0fbe4dff 2b0d???????? 740c } // n = 5, score = 100 // 33d0 | xor edx, eax // 7418 | je 0x1a // 0fbe4dff | movsx ecx, byte ptr [ebp - 1] // 2b0d???????? | // 740c | je 0xe $sequence_37 = { 8b8d5cffffff 890d???????? 0fb655fd 0315???????? 0fbe45fc } // n = 5, score = 100 // 8b8d5cffffff | mov ecx, dword ptr [ebp - 0xa4] // 890d???????? | // 0fb655fd | movzx edx, byte ptr [ebp - 3] // 0315???????? | // 0fbe45fc | movsx eax, byte ptr [ebp - 4] condition: 7 of them and filesize < 70128640 }
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