Actor(s): Hellsing
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rule win_sisfader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.sisfader." 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.sisfader" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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???????? 85c0 b91d000000 0f44d9 } // n = 4, score = 300 // e8???????? | // 85c0 | test eax, eax // b91d000000 | mov ecx, 0x1d // 0f44d9 | cmove ebx, ecx $sequence_1 = { 85c9 741f 33c0 85c9 7419 } // n = 5, score = 300 // 85c9 | test ecx, ecx // 741f | je 0x21 // 33c0 | xor eax, eax // 85c9 | test ecx, ecx // 7419 | je 0x1b $sequence_2 = { 52 50 51 57 894c2424 } // n = 5, score = 200 // 52 | push edx // 50 | push eax // 51 | push ecx // 57 | push edi // 894c2424 | mov dword ptr [esp + 0x24], ecx $sequence_3 = { 837c245000 7405 e9???????? 83bc248000000000 } // n = 4, score = 200 // 837c245000 | cmp dword ptr [esp + 0x50], 0 // 7405 | je 7 // e9???????? | // 83bc248000000000 | cmp dword ptr [esp + 0x80], 0 $sequence_4 = { ba08020000 0f114014 c7400856120000 89580c c700aaeeddff 33c0 } // n = 6, score = 200 // ba08020000 | mov edx, 0x208 // 0f114014 | movups xmmword ptr [eax + 0x14], xmm0 // c7400856120000 | mov dword ptr [eax + 8], 0x1256 // 89580c | mov dword ptr [eax + 0xc], ebx // c700aaeeddff | mov dword ptr [eax], 0xffddeeaa // 33c0 | xor eax, eax $sequence_5 = { ff15???????? eb2e 8b4dfc c7411001000000 } // n = 4, score = 200 // ff15???????? | // eb2e | jmp 0x30 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // c7411001000000 | mov dword ptr [ecx + 0x10], 1 $sequence_6 = { ff15???????? 8945f8 837df800 7402 eb5b 837d0800 751f } // n = 7, score = 200 // ff15???????? | // 8945f8 | mov dword ptr [ebp - 8], eax // 837df800 | cmp dword ptr [ebp - 8], 0 // 7402 | je 4 // eb5b | jmp 0x5d // 837d0800 | cmp dword ptr [ebp + 8], 0 // 751f | jne 0x21 $sequence_7 = { 33d2 2bd8 6690 8d4c2410 03ca 8a01 } // n = 6, score = 200 // 33d2 | xor edx, edx // 2bd8 | sub ebx, eax // 6690 | nop // 8d4c2410 | lea ecx, [esp + 0x10] // 03ca | add ecx, edx // 8a01 | mov al, byte ptr [ecx] $sequence_8 = { 50 6a03 6a00 8b4d14 51 8b55fc 52 } // n = 7, score = 200 // 50 | push eax // 6a03 | push 3 // 6a00 | push 0 // 8b4d14 | mov ecx, dword ptr [ebp + 0x14] // 51 | push ecx // 8b55fc | mov edx, dword ptr [ebp - 4] // 52 | push edx $sequence_9 = { 66837c246c2e 7518 0fb74c246e 6685c9 } // n = 4, score = 200 // 66837c246c2e | cmp word ptr [esp + 0x6c], 0x2e // 7518 | jne 0x1a // 0fb74c246e | movzx ecx, word ptr [esp + 0x6e] // 6685c9 | test cx, cx $sequence_10 = { 8d8d94fdffff 895de8 51 50 } // n = 4, score = 200 // 8d8d94fdffff | lea ecx, [ebp - 0x26c] // 895de8 | mov dword ptr [ebp - 0x18], ebx // 51 | push ecx // 50 | push eax $sequence_11 = { 33c0 0f8579ffffff 837dfc00 740a 8b4dfc 51 } // n = 6, score = 200 // 33c0 | xor eax, eax // 0f8579ffffff | jne 0xffffff7f // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 740a | je 0xc // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 51 | push ecx $sequence_12 = { 8bec c705????????10000000 8b4508 a3???????? c705????????07000000 8b4d0c 890d???????? } // n = 7, score = 200 // 8bec | mov ebp, esp // c705????????10000000 | // 8b4508 | mov eax, dword ptr [ebp + 8] // a3???????? | // c705????????07000000 | // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 890d???????? | $sequence_13 = { 83c414 8945d4 8b4df8 8b5154 52 8b45ec 50 } // n = 7, score = 200 // 83c414 | add esp, 0x14 // 8945d4 | mov dword ptr [ebp - 0x2c], eax // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 8b5154 | mov edx, dword ptr [ecx + 0x54] // 52 | push edx // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 50 | push eax $sequence_14 = { c705????????07000000 8b442438 8905???????? c705????????00000000 8b442440 8905???????? } // n = 6, score = 200 // c705????????07000000 | // 8b442438 | mov eax, dword ptr [esp + 0x38] // 8905???????? | // c705????????00000000 | // 8b442440 | mov eax, dword ptr [esp + 0x40] // 8905???????? | $sequence_15 = { 0f11442454 c744245061090000 e8???????? 85c0 } // n = 4, score = 200 // 0f11442454 | movups xmmword ptr [esp + 0x54], xmm0 // c744245061090000 | mov dword ptr [esp + 0x50], 0x961 // e8???????? | // 85c0 | test eax, eax $sequence_16 = { c745f000000000 c745fc00000000 c745f400000000 6a00 8d45fc 50 6a00 } // n = 7, score = 200 // c745f000000000 | mov dword ptr [ebp - 0x10], 0 // c745fc00000000 | mov dword ptr [ebp - 4], 0 // c745f400000000 | mov dword ptr [ebp - 0xc], 0 // 6a00 | push 0 // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // 6a00 | push 0 $sequence_17 = { c705????????10000000 8b442430 8905???????? c705????????07000000 8b442438 8905???????? } // n = 6, score = 200 // c705????????10000000 | // 8b442430 | mov eax, dword ptr [esp + 0x30] // 8905???????? | // c705????????07000000 | // 8b442438 | mov eax, dword ptr [esp + 0x38] // 8905???????? | $sequence_18 = { c700aaeeddff c74008010f0000 0f1086f0000000 c7400410000000 c7400c00000000 0f114014 } // n = 6, score = 200 // c700aaeeddff | mov dword ptr [eax], 0xffddeeaa // c74008010f0000 | mov dword ptr [eax + 8], 0xf01 // 0f1086f0000000 | movups xmm0, xmmword ptr [esi + 0xf0] // c7400410000000 | mov dword ptr [eax + 4], 0x10 // c7400c00000000 | mov dword ptr [eax + 0xc], 0 // 0f114014 | movups xmmword ptr [eax + 0x14], xmm0 $sequence_19 = { 837c245000 7402 eb12 c744245401000000 33c0 85c0 0f850fffffff } // n = 7, score = 200 // 837c245000 | cmp dword ptr [esp + 0x50], 0 // 7402 | je 4 // eb12 | jmp 0x14 // c744245401000000 | mov dword ptr [esp + 0x54], 1 // 33c0 | xor eax, eax // 85c0 | test eax, eax // 0f850fffffff | jne 0xffffff15 $sequence_20 = { e8???????? b90e000000 ff15???????? 33c0 e9???????? e9???????? ff15???????? } // n = 7, score = 200 // e8???????? | // b90e000000 | mov ecx, 0xe // ff15???????? | // 33c0 | xor eax, eax // e9???????? | // e9???????? | // ff15???????? | $sequence_21 = { 57 0fb7832c010000 8955fc 6685c0 740b } // n = 5, score = 200 // 57 | push edi // 0fb7832c010000 | movzx eax, word ptr [ebx + 0x12c] // 8955fc | mov dword ptr [ebp - 4], edx // 6685c0 | test ax, ax // 740b | je 0xd $sequence_22 = { 53 0f11442414 8d4c2414 0f1087f0000000 0f11442424 e8???????? 83c404 } // n = 7, score = 200 // 53 | push ebx // 0f11442414 | movups xmmword ptr [esp + 0x14], xmm0 // 8d4c2414 | lea ecx, [esp + 0x14] // 0f1087f0000000 | movups xmm0, xmmword ptr [edi + 0xf0] // 0f11442424 | movups xmmword ptr [esp + 0x24], xmm0 // e8???????? | // 83c404 | add esp, 4 $sequence_23 = { 8b4d0c 894dec 8b55ec 8b02 8945f4 8b4de8 8b11 } // n = 7, score = 200 // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 894dec | mov dword ptr [ebp - 0x14], ecx // 8b55ec | mov edx, dword ptr [ebp - 0x14] // 8b02 | mov eax, dword ptr [edx] // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] // 8b11 | mov edx, dword ptr [ecx] $sequence_24 = { 751b 0fb78dae010000 6685c9 7411 6683f92e 7509 } // n = 6, score = 200 // 751b | jne 0x1d // 0fb78dae010000 | movzx ecx, word ptr [ebp + 0x1ae] // 6685c9 | test cx, cx // 7411 | je 0x13 // 6683f92e | cmp cx, 0x2e // 7509 | jne 0xb $sequence_25 = { 837c242004 7479 837c242005 0f8480000000 } // n = 4, score = 200 // 837c242004 | cmp dword ptr [esp + 0x20], 4 // 7479 | je 0x7b // 837c242005 | cmp dword ptr [esp + 0x20], 5 // 0f8480000000 | je 0x86 $sequence_26 = { e8???????? 85c0 7590 b81d000000 } // n = 4, score = 200 // e8???????? | // 85c0 | test eax, eax // 7590 | jne 0xffffff92 // b81d000000 | mov eax, 0x1d $sequence_27 = { 33d2 b904000000 e8???????? 33c0 } // n = 4, score = 200 // 33d2 | xor edx, edx // b904000000 | mov ecx, 4 // e8???????? | // 33c0 | xor eax, eax $sequence_28 = { c745d051120000 8945d4 0f1145dc e8???????? 83c404 } // n = 5, score = 200 // c745d051120000 | mov dword ptr [ebp - 0x30], 0x1251 // 8945d4 | mov dword ptr [ebp - 0x2c], eax // 0f1145dc | movups xmmword ptr [ebp - 0x24], xmm0 // e8???????? | // 83c404 | add esp, 4 $sequence_29 = { 837c242001 7425 837c242002 7441 837c242003 745d } // n = 6, score = 200 // 837c242001 | cmp dword ptr [esp + 0x20], 1 // 7425 | je 0x27 // 837c242002 | cmp dword ptr [esp + 0x20], 2 // 7441 | je 0x43 // 837c242003 | cmp dword ptr [esp + 0x20], 3 // 745d | je 0x5f condition: 7 of them and filesize < 417792 }
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