Actor(s): Silence group
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rule win_silence_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { cc 8325????????00 c3 6a08 } // n = 4, score = 1800 // cc | int3 // 8325????????00 | // c3 | ret // 6a08 | push 8 $sequence_1 = { 6a00 8d45fc 50 6a00 6a00 68???????? c745fc00000000 } // n = 7, score = 1800 // 6a00 | push 0 // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 // 68???????? | // c745fc00000000 | mov dword ptr [ebp - 4], 0 $sequence_2 = { 740a 8a4801 40 84c9 75f4 eb05 803800 } // n = 7, score = 1800 // 740a | je 0xc // 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_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 = { 46 56 8d85f8feffff 50 } // n = 4, score = 1600 // 46 | inc esi // 56 | push esi // 8d85f8feffff | lea eax, [ebp - 0x108] // 50 | push eax $sequence_5 = { 7502 f3c3 e9???????? e8???????? e9???????? 6a14 } // n = 6, score = 1600 // 7502 | jne 4 // f3c3 | ret // e9???????? | // e8???????? | // e9???????? | // 6a14 | push 0x14 $sequence_6 = { ff15???????? 6a00 6800000004 6a00 6a00 } // n = 5, score = 1600 // ff15???????? | // 6a00 | push 0 // 6800000004 | push 0x4000000 // 6a00 | push 0 // 6a00 | push 0 $sequence_7 = { 6801000080 ff15???????? 56 8d85f8feffff } // n = 4, score = 1600 // 6801000080 | push 0x80000001 // ff15???????? | // 56 | push esi // 8d85f8feffff | lea eax, [ebp - 0x108] $sequence_8 = { 68???????? ffd6 8b45fc 85c0 } // n = 4, score = 1600 // 68???????? | // ffd6 | call esi // 8b45fc | mov eax, dword ptr [ebp - 4] // 85c0 | test eax, eax $sequence_9 = { 6a00 57 ff15???????? 8d45fc 50 } // n = 5, score = 1400 // 6a00 | push 0 // 57 | push edi // ff15???????? | // 8d45fc | lea eax, [ebp - 4] // 50 | push eax $sequence_10 = { 8bd8 68???????? 53 ff15???????? 6a00 } // n = 5, score = 1400 // 8bd8 | mov ebx, eax // 68???????? | // 53 | push ebx // ff15???????? | // 6a00 | push 0 $sequence_11 = { 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_12 = { 5b 5d c3 c60200 } // n = 4, score = 1400 // 5b | pop ebx // 5d | pop ebp // c3 | ret // c60200 | mov byte ptr [edx], 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 ff15???????? 8bf0 6a00 85f6 } // n = 5, score = 1400 // 50 | push eax // ff15???????? | // 8bf0 | mov esi, eax // 6a00 | push 0 // 85f6 | test esi, esi $sequence_15 = { 8d8db4f7ffff 51 50 8d85bcf7ffff 50 } // n = 5, score = 1200 // 8d8db4f7ffff | lea ecx, [ebp - 0x84c] // 51 | push ecx // 50 | push eax // 8d85bcf7ffff | lea eax, [ebp - 0x844] // 50 | push eax $sequence_16 = { ff15???????? 8d85b8f7ffff 50 6800080000 8d85bcf7ffff 50 } // n = 6, score = 1200 // ff15???????? | // 8d85b8f7ffff | lea eax, [ebp - 0x848] // 50 | push eax // 6800080000 | push 0x800 // 8d85bcf7ffff | lea eax, [ebp - 0x844] // 50 | push eax $sequence_17 = { 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_18 = { 51 898df8fbffff 8d8dfcfbffff 51 ffb5f0fbffff } // n = 5, score = 1100 // 51 | push ecx // 898df8fbffff | mov dword ptr [ebp - 0x408], ecx // 8d8dfcfbffff | lea ecx, [ebp - 0x404] // 51 | push ecx // ffb5f0fbffff | push dword ptr [ebp - 0x410] $sequence_19 = { 83c41c 895ef8 897ef0 5b 5f 5e } // n = 6, score = 1100 // 83c41c | add esp, 0x1c // 895ef8 | mov dword ptr [esi - 8], ebx // 897ef0 | mov dword ptr [esi - 0x10], edi // 5b | pop ebx // 5f | pop edi // 5e | pop esi $sequence_20 = { 8bf9 e8???????? ff37 8b35???????? ffd6 ff7704 } // n = 6, score = 1100 // 8bf9 | mov edi, ecx // e8???????? | // ff37 | push dword ptr [edi] // 8b35???????? | // ffd6 | call esi // ff7704 | push dword ptr [edi + 4] $sequence_21 = { 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_22 = { 85c9 7412 8b01 52 8d95f0fdffff 52 ff10 } // n = 7, score = 1100 // 85c9 | test ecx, ecx // 7412 | je 0x14 // 8b01 | mov eax, dword ptr [ecx] // 52 | push edx // 8d95f0fdffff | lea edx, [ebp - 0x210] // 52 | push edx // ff10 | call dword ptr [eax] $sequence_23 = { ffb5f0fbffff 8bcb ff5038 85c0 } // n = 4, score = 1100 // ffb5f0fbffff | push dword ptr [ebp - 0x410] // 8bcb | mov ecx, ebx // ff5038 | call dword ptr [eax + 0x38] // 85c0 | test eax, eax $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 = { c705????????00000000 c705????????04000000 ff15???????? 85c0 750b 68???????? } // n = 6, score = 400 // c705????????00000000 | // c705????????04000000 | // ff15???????? | // 85c0 | test eax, eax // 750b | jne 0xd // 68???????? | $sequence_26 = { ff15???????? 68c0d40100 ff15???????? e9???????? } // n = 4, score = 400 // ff15???????? | // 68c0d40100 | push 0x1d4c0 // ff15???????? | // e9???????? | $sequence_27 = { 750b 68???????? ff15???????? ff35???????? ff15???????? } // n = 5, score = 400 // 750b | jne 0xd // 68???????? | // ff15???????? | // ff35???????? | // ff15???????? | $sequence_28 = { 68???????? ff15???????? a3???????? 85c0 750e 68???????? ff15???????? } // n = 7, score = 400 // 68???????? | // ff15???????? | // a3???????? | // 85c0 | test eax, eax // 750e | jne 0x10 // 68???????? | // ff15???????? | $sequence_29 = { 55 8bec ff4d08 755d 833d????????04 } // n = 5, score = 400 // 55 | push ebp // 8bec | mov ebp, esp // ff4d08 | dec dword ptr [ebp + 8] // 755d | jne 0x5f // 833d????????04 | $sequence_30 = { 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_31 = { c705????????00000000 ffd3 8b3d???????? 85c0 7507 68???????? } // n = 6, score = 400 // c705????????00000000 | // ffd3 | call ebx // 8b3d???????? | // 85c0 | test eax, eax // 7507 | jne 9 // 68???????? | $sequence_32 = { 68???????? ff15???????? c20800 53 8b1d???????? 57 0f57c0 } // n = 7, score = 400 // 68???????? | // ff15???????? | // c20800 | ret 8 // 53 | push ebx // 8b1d???????? | // 57 | push edi // 0f57c0 | xorps xmm0, xmm0 $sequence_33 = { 7507 68???????? ffd7 6a00 6a00 } // n = 5, score = 400 // 7507 | jne 9 // 68???????? | // ffd7 | call edi // 6a00 | push 0 // 6a00 | push 0 $sequence_34 = { 6a00 ff15???????? 6a00 6a00 68???????? ff15???????? } // n = 6, score = 200 // 6a00 | push 0 // ff15???????? | // 6a00 | push 0 // 6a00 | push 0 // 68???????? | // ff15???????? | $sequence_35 = { 66a3???????? c745d485040000 c745d40b000000 eb09 8b4dd4 83c101 894dd4 } // n = 7, score = 100 // 66a3???????? | // c745d485040000 | mov dword ptr [ebp - 0x2c], 0x485 // c745d40b000000 | mov dword ptr [ebp - 0x2c], 0xb // eb09 | jmp 0xb // 8b4dd4 | mov ecx, dword ptr [ebp - 0x2c] // 83c101 | add ecx, 1 // 894dd4 | mov dword ptr [ebp - 0x2c], ecx $sequence_36 = { 0fbe45ff 8b0d???????? d3e0 3bd0 740c c7855cffffff00000000 eb0a } // n = 7, score = 100 // 0fbe45ff | movsx eax, byte ptr [ebp - 1] // 8b0d???????? | // d3e0 | shl eax, cl // 3bd0 | cmp edx, eax // 740c | je 0xe // c7855cffffff00000000 | mov dword ptr [ebp - 0xa4], 0 // eb0a | jmp 0xc $sequence_37 = { 0fbe1401 c1e206 b801000000 6bc803 8b4508 0fbe0c08 0bd1 } // n = 7, score = 100 // 0fbe1401 | movsx edx, byte ptr [ecx + eax] // c1e206 | shl edx, 6 // b801000000 | mov eax, 1 // 6bc803 | imul ecx, eax, 3 // 8b4508 | mov eax, dword ptr [ebp + 8] // 0fbe0c08 | movsx ecx, byte ptr [eax + ecx] // 0bd1 | or edx, ecx $sequence_38 = { c785e4feffff00000000 6810010000 6a00 8d8de8feffff 51 e8???????? } // n = 6, score = 100 // c785e4feffff00000000 | mov dword ptr [ebp - 0x11c], 0 // 6810010000 | push 0x110 // 6a00 | push 0 // 8d8de8feffff | lea ecx, [ebp - 0x118] // 51 | push ecx // e8???????? | condition: 7 of them and filesize < 70128640 }
rule win_silence_w0 { meta: description = "detect_silence_Downloader" author = "@malgamy12" date = "8/11/2022" license = "DRL 1.1" sample1 = "BAE2737C39C0DEF9603EF9E6CD4921BF641FAB91" sample2 = "A7421FDA552316FD89FA545D1815DE0AF8EC2858" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.silence" malpedia_rule_date = "20230118" malpedia_hash = "" malpedia_version = "20230118" malpedia_license = "DRL 1.1" malpedia_sharing = "TLP:WHITE" strings: $intel = "IntelSofts" ascii $s1 = "MicrosoftUpdte" ascii $s2 = "php?name=" ascii $s3 = "SoftWare\\Microsoft\\Windows\\CurrentVersion\\Run" ascii $s4 = "ShellExecuteA" ascii $s5 = "InternetOpenA" ascii $s6 = "CreateFileA" ascii $s7 = "CreateProcessA" ascii condition: uint16(0) == 0x5A4D and $intel or (6 of ($s*)) }
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