Actor(s): Hellsing
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rule win_sisfader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "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 = { 741f 33c0 85c9 7419 } // n = 4, score = 300 // 741f | je 0x21 // 33c0 | xor eax, eax // 85c9 | test ecx, ecx // 7419 | je 0x1b $sequence_1 = { e8???????? 85c0 b91d000000 0f44d9 } // n = 4, score = 300 // e8???????? | // 85c0 | test eax, eax // b91d000000 | mov ecx, 0x1d // 0f44d9 | cmove ebx, ecx $sequence_2 = { 746b c744242000000000 eb0a 8b442420 ffc0 } // n = 5, score = 200 // 746b | je 0x6d // c744242000000000 | mov dword ptr [esp + 0x20], 0 // eb0a | jmp 0xc // 8b442420 | mov eax, dword ptr [esp + 0x20] // ffc0 | inc eax $sequence_3 = { 6a40 ff15???????? 8945f8 8d4dfc 51 8b55f8 } // n = 6, score = 200 // 6a40 | push 0x40 // ff15???????? | // 8945f8 | mov dword ptr [ebp - 8], eax // 8d4dfc | lea ecx, [ebp - 4] // 51 | push ecx // 8b55f8 | mov edx, dword ptr [ebp - 8] $sequence_4 = { ff15???????? 83c404 8b45fc 83780400 } // n = 4, score = 200 // ff15???????? | // 83c404 | add esp, 4 // 8b45fc | mov eax, dword ptr [ebp - 4] // 83780400 | cmp dword ptr [eax + 4], 0 $sequence_5 = { 894de0 ebac 8d55a0 52 ff15???????? } // n = 5, score = 200 // 894de0 | mov dword ptr [ebp - 0x20], ecx // ebac | jmp 0xffffffae // 8d55a0 | lea edx, [ebp - 0x60] // 52 | push edx // ff15???????? | $sequence_6 = { 5e 5b c3 81f9e2f00000 756b c74708e3f00000 } // n = 6, score = 200 // 5e | pop esi // 5b | pop ebx // c3 | ret // 81f9e2f00000 | cmp ecx, 0xf0e2 // 756b | jne 0x6d // c74708e3f00000 | mov dword ptr [edi + 8], 0xf0e3 $sequence_7 = { 8b4508 83ec24 817808e3e00000 7409 b820010000 8be5 5d } // n = 7, score = 200 // 8b4508 | mov eax, dword ptr [ebp + 8] // 83ec24 | sub esp, 0x24 // 817808e3e00000 | cmp dword ptr [eax + 8], 0xe0e3 // 7409 | je 0xb // b820010000 | mov eax, 0x120 // 8be5 | mov esp, ebp // 5d | pop ebp $sequence_8 = { c745fc60010000 837d0800 7423 8d450c 50 8b4d08 } // n = 6, score = 200 // c745fc60010000 | mov dword ptr [ebp - 4], 0x160 // 837d0800 | cmp dword ptr [ebp + 8], 0 // 7423 | je 0x25 // 8d450c | lea eax, [ebp + 0xc] // 50 | push eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_9 = { 7425 837c242002 7441 837c242003 745d 837c242004 7479 } // n = 7, score = 200 // 7425 | je 0x27 // 837c242002 | cmp dword ptr [esp + 0x20], 2 // 7441 | je 0x43 // 837c242003 | cmp dword ptr [esp + 0x20], 3 // 745d | je 0x5f // 837c242004 | cmp dword ptr [esp + 0x20], 4 // 7479 | je 0x7b $sequence_10 = { eb1f 8b4d1c 8b11 52 8b4518 } // n = 5, score = 200 // eb1f | jmp 0x21 // 8b4d1c | mov ecx, dword ptr [ebp + 0x1c] // 8b11 | mov edx, dword ptr [ecx] // 52 | push edx // 8b4518 | mov eax, dword ptr [ebp + 0x18] $sequence_11 = { 7402 eb12 c744245401000000 33c0 } // n = 4, score = 200 // 7402 | je 4 // eb12 | jmp 0x14 // c744245401000000 | mov dword ptr [esp + 0x54], 1 // 33c0 | xor eax, eax $sequence_12 = { 7407 33c0 e9???????? ba01000000 } // n = 4, score = 200 // 7407 | je 9 // 33c0 | xor eax, eax // e9???????? | // ba01000000 | mov edx, 1 $sequence_13 = { 8b45a4 50 8b4df8 8b5150 52 e8???????? } // n = 6, score = 200 // 8b45a4 | mov eax, dword ptr [ebp - 0x5c] // 50 | push eax // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 8b5150 | mov edx, dword ptr [ecx + 0x50] // 52 | push edx // e8???????? | $sequence_14 = { 0fb74c247e 6685c9 0f84cd010000 6683f92e 750f 6683bc248000000000 0f84b8010000 } // n = 7, score = 200 // 0fb74c247e | movzx ecx, word ptr [esp + 0x7e] // 6685c9 | test cx, cx // 0f84cd010000 | je 0x1d3 // 6683f92e | cmp cx, 0x2e // 750f | jne 0x11 // 6683bc248000000000 | cmp word ptr [esp + 0x80], 0 // 0f84b8010000 | je 0x1be $sequence_15 = { 3bf7 7c99 eb06 ff15???????? ff75f4 } // n = 5, score = 200 // 3bf7 | cmp esi, edi // 7c99 | jl 0xffffff9b // eb06 | jmp 8 // ff15???????? | // ff75f4 | push dword ptr [ebp - 0xc] $sequence_16 = { 8901 8d4dec 0fb703 668945ec 0fb74302 } // n = 5, score = 200 // 8901 | mov dword ptr [ecx], eax // 8d4dec | lea ecx, [ebp - 0x14] // 0fb703 | movzx eax, word ptr [ebx] // 668945ec | mov word ptr [ebp - 0x14], ax // 0fb74302 | movzx eax, word ptr [ebx + 2] $sequence_17 = { 33d2 b907000000 e8???????? eb44 } // n = 4, score = 200 // 33d2 | xor edx, edx // b907000000 | mov ecx, 7 // e8???????? | // eb44 | jmp 0x46 $sequence_18 = { 90 8bc8 83e10f 8a0c11 300c30 40 } // n = 6, score = 200 // 90 | nop // 8bc8 | mov ecx, eax // 83e10f | and ecx, 0xf // 8a0c11 | mov cl, byte ptr [ecx + edx] // 300c30 | xor byte ptr [eax + esi], cl // 40 | inc eax $sequence_19 = { 89442450 837c245000 7402 eb12 } // n = 4, score = 200 // 89442450 | mov dword ptr [esp + 0x50], eax // 837c245000 | cmp dword ptr [esp + 0x50], 0 // 7402 | je 4 // eb12 | jmp 0x14 $sequence_20 = { 817908020f0000 0f8573010000 83790410 c7442470dcff0000 } // n = 4, score = 200 // 817908020f0000 | cmp dword ptr [ecx + 8], 0xf02 // 0f8573010000 | jne 0x179 // 83790410 | cmp dword ptr [ecx + 4], 0x10 // c7442470dcff0000 | mov dword ptr [esp + 0x70], 0xffdc $sequence_21 = { 89442450 837c245000 7405 e9???????? 83bc248000000000 } // n = 5, score = 200 // 89442450 | mov dword ptr [esp + 0x50], eax // 837c245000 | cmp dword ptr [esp + 0x50], 0 // 7405 | je 7 // e9???????? | // 83bc248000000000 | cmp dword ptr [esp + 0x80], 0 $sequence_22 = { ffd3 ff75f4 ff15???????? 8d45ec 50 } // n = 5, score = 200 // ffd3 | call ebx // ff75f4 | push dword ptr [ebp - 0xc] // ff15???????? | // 8d45ec | lea eax, [ebp - 0x14] // 50 | push eax $sequence_23 = { 7508 891e eb35 33c0 } // n = 4, score = 200 // 7508 | jne 0xa // 891e | mov dword ptr [esi], ebx // eb35 | jmp 0x37 // 33c0 | xor eax, eax $sequence_24 = { 8b55f8 8b4134 2b4234 8945d0 7418 8b4dd0 } // n = 6, score = 200 // 8b55f8 | mov edx, dword ptr [ebp - 8] // 8b4134 | mov eax, dword ptr [ecx + 0x34] // 2b4234 | sub eax, dword ptr [edx + 0x34] // 8945d0 | mov dword ptr [ebp - 0x30], eax // 7418 | je 0x1a // 8b4dd0 | mov ecx, dword ptr [ebp - 0x30] $sequence_25 = { 745d 837c242004 7479 837c242005 0f8480000000 e9???????? } // n = 6, score = 200 // 745d | je 0x5f // 837c242004 | cmp dword ptr [esp + 0x20], 4 // 7479 | je 0x7b // 837c242005 | cmp dword ptr [esp + 0x20], 5 // 0f8480000000 | je 0x86 // e9???????? | $sequence_26 = { 8b4508 a3???????? c705????????07000000 8b4d0c 890d???????? c705????????00000000 8b5510 } // n = 7, score = 200 // 8b4508 | mov eax, dword ptr [ebp + 8] // a3???????? | // c705????????07000000 | // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 890d???????? | // c705????????00000000 | // 8b5510 | mov edx, dword ptr [ebp + 0x10] $sequence_27 = { 8b442450 8906 8b442470 89442440 } // n = 4, score = 200 // 8b442450 | mov eax, dword ptr [esp + 0x50] // 8906 | mov dword ptr [esi], eax // 8b442470 | mov eax, dword ptr [esp + 0x70] // 89442440 | mov dword ptr [esp + 0x40], eax $sequence_28 = { 0f114624 668b5764 50 ff7720 e8???????? 8b471c 83c410 } // n = 7, score = 200 // 0f114624 | movups xmmword ptr [esi + 0x24], xmm0 // 668b5764 | mov dx, word ptr [edi + 0x64] // 50 | push eax // ff7720 | push dword ptr [edi + 0x20] // e8???????? | // 8b471c | mov eax, dword ptr [edi + 0x1c] // 83c410 | add esp, 0x10 $sequence_29 = { 33d2 b904000000 e8???????? 33c0 83f801 7425 baffffffff } // n = 7, score = 200 // 33d2 | xor edx, edx // b904000000 | mov ecx, 4 // e8???????? | // 33c0 | xor eax, eax // 83f801 | cmp eax, 1 // 7425 | je 0x27 // baffffffff | mov edx, 0xffffffff condition: 7 of them and filesize < 417792 }
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