Actor(s): Hellsing
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rule win_sisfader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 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 = { 8905???????? c705????????00000000 8b442440 8905???????? } // n = 4, score = 200 // 8905???????? | // c705????????00000000 | // 8b442440 | mov eax, dword ptr [esp + 0x40] // 8905???????? | $sequence_3 = { f3a5 6a00 ff15???????? a3???????? 85c0 7409 5f } // n = 7, score = 200 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 6a00 | push 0 // ff15???????? | // a3???????? | // 85c0 | test eax, eax // 7409 | je 0xb // 5f | pop edi $sequence_4 = { 837c242002 7441 837c242003 745d } // n = 4, score = 200 // 837c242002 | cmp dword ptr [esp + 0x20], 2 // 7441 | je 0x43 // 837c242003 | cmp dword ptr [esp + 0x20], 3 // 745d | je 0x5f $sequence_5 = { ff15???????? 89442450 837c245000 7402 } // n = 4, score = 200 // ff15???????? | // 89442450 | mov dword ptr [esp + 0x50], eax // 837c245000 | cmp dword ptr [esp + 0x50], 0 // 7402 | je 4 $sequence_6 = { 89842480000000 83bc248000000000 750d b95a040000 ff15???????? eb43 } // n = 6, score = 200 // 89842480000000 | mov dword ptr [esp + 0x80], eax // 83bc248000000000 | cmp dword ptr [esp + 0x80], 0 // 750d | jne 0xf // b95a040000 | mov ecx, 0x45a // ff15???????? | // eb43 | jmp 0x45 $sequence_7 = { 0fb74c246e 6685c9 7415 6683f92e 7508 } // n = 5, score = 200 // 0fb74c246e | movzx ecx, word ptr [esp + 0x6e] // 6685c9 | test cx, cx // 7415 | je 0x17 // 6683f92e | cmp cx, 0x2e // 7508 | jne 0xa $sequence_8 = { 8b442448 89442420 837c242001 7402 eb05 } // n = 5, score = 200 // 8b442448 | mov eax, dword ptr [esp + 0x48] // 89442420 | mov dword ptr [esp + 0x20], eax // 837c242001 | cmp dword ptr [esp + 0x20], 1 // 7402 | je 4 // eb05 | jmp 7 $sequence_9 = { c744244854120000 0f11442454 c744245061090000 e8???????? 85c0 7554 } // n = 6, score = 200 // c744244854120000 | mov dword ptr [esp + 0x48], 0x1254 // 0f11442454 | movups xmmword ptr [esp + 0x54], xmm0 // c744245061090000 | mov dword ptr [esp + 0x50], 0x961 // e8???????? | // 85c0 | test eax, eax // 7554 | jne 0x56 $sequence_10 = { c70665632985 663939 8b3d???????? 7407 51 } // n = 5, score = 200 // c70665632985 | mov dword ptr [esi], 0x85296365 // 663939 | cmp word ptr [ecx], di // 8b3d???????? | // 7407 | je 9 // 51 | push ecx $sequence_11 = { 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_12 = { 8b442440 89442420 837c242001 7425 837c242002 7441 } // n = 6, score = 200 // 8b442440 | mov eax, dword ptr [esp + 0x40] // 89442420 | mov dword ptr [esp + 0x20], eax // 837c242001 | cmp dword ptr [esp + 0x20], 1 // 7425 | je 0x27 // 837c242002 | cmp dword ptr [esp + 0x20], 2 // 7441 | je 0x43 $sequence_13 = { a1???????? 50 6a01 e8???????? 83c418 } // n = 5, score = 200 // a1???????? | // 50 | push eax // 6a01 | push 1 // e8???????? | // 83c418 | add esp, 0x18 $sequence_14 = { 83c404 85c0 7502 eb71 8b45fc 8b08 83792800 } // n = 7, score = 200 // 83c404 | add esp, 4 // 85c0 | test eax, eax // 7502 | jne 4 // eb71 | jmp 0x73 // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b08 | mov ecx, dword ptr [eax] // 83792800 | cmp dword ptr [ecx + 0x28], 0 $sequence_15 = { 1bc0 83c801 8945f0 8b4df0 894de4 } // n = 5, score = 200 // 1bc0 | sbb eax, eax // 83c801 | or eax, 1 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 894de4 | mov dword ptr [ebp - 0x1c], ecx $sequence_16 = { 89442450 837c245000 7405 e9???????? 83bc248000000000 7539 } // n = 6, 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 // 7539 | jne 0x3b $sequence_17 = { 7421 6aff 8b0d???????? 51 ff15???????? 6a00 } // n = 6, score = 200 // 7421 | je 0x23 // 6aff | push -1 // 8b0d???????? | // 51 | push ecx // ff15???????? | // 6a00 | push 0 $sequence_18 = { ff15???????? c1e802 33db 898754010000 } // n = 4, score = 200 // ff15???????? | // c1e802 | shr eax, 2 // 33db | xor ebx, ebx // 898754010000 | mov dword ptr [edi + 0x154], eax $sequence_19 = { 7502 eb67 8b4dfc 51 8b55f8 52 e8???????? } // n = 7, score = 200 // 7502 | jne 4 // eb67 | jmp 0x69 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 51 | push ecx // 8b55f8 | mov edx, dword ptr [ebp - 8] // 52 | push edx // e8???????? | $sequence_20 = { 33db 8bd3 395904 761b } // n = 4, score = 200 // 33db | xor ebx, ebx // 8bd3 | mov edx, ebx // 395904 | cmp dword ptr [ecx + 4], ebx // 761b | jbe 0x1d $sequence_21 = { c7460855120000 0f1005???????? 51 57 0f114614 ff15???????? } // n = 6, score = 200 // c7460855120000 | mov dword ptr [esi + 8], 0x1255 // 0f1005???????? | // 51 | push ecx // 57 | push edi // 0f114614 | movups xmmword ptr [esi + 0x14], xmm0 // ff15???????? | $sequence_22 = { 8b450c 8986cc010000 8d4580 50 ff15???????? 668b4594 6689460c } // n = 7, score = 200 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 8986cc010000 | mov dword ptr [esi + 0x1cc], eax // 8d4580 | lea eax, [ebp - 0x80] // 50 | push eax // ff15???????? | // 668b4594 | mov ax, word ptr [ebp - 0x6c] // 6689460c | mov word ptr [esi + 0xc], ax $sequence_23 = { 7411 6683f92e 7509 66399db0010000 7402 } // n = 5, score = 200 // 7411 | je 0x13 // 6683f92e | cmp cx, 0x2e // 7509 | jne 0xb // 66399db0010000 | cmp word ptr [ebp + 0x1b0], bx // 7402 | je 4 $sequence_24 = { c745d800000000 8b55fc 8b45d8 894214 8b4dfc } // n = 5, score = 200 // c745d800000000 | mov dword ptr [ebp - 0x28], 0 // 8b55fc | mov edx, dword ptr [ebp - 4] // 8b45d8 | mov eax, dword ptr [ebp - 0x28] // 894214 | mov dword ptr [edx + 0x14], eax // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_25 = { ff15???????? 56 ff15???????? a810 746a 8b570c } // n = 6, score = 200 // ff15???????? | // 56 | push esi // ff15???????? | // a810 | test al, 0x10 // 746a | je 0x6c // 8b570c | mov edx, dword ptr [edi + 0xc] $sequence_26 = { c700aaeeddff c74008010f0000 0f1086f0000000 c7400410000000 } // n = 4, 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 $sequence_27 = { 6a00 6a01 e8???????? 83c40c eb38 6a00 6a00 } // n = 7, score = 200 // 6a00 | push 0 // 6a01 | push 1 // e8???????? | // 83c40c | add esp, 0xc // eb38 | jmp 0x3a // 6a00 | push 0 // 6a00 | push 0 $sequence_28 = { 0f8579ffffff 837dfc00 740a 8b4dfc 51 ff15???????? } // n = 6, score = 200 // 0f8579ffffff | jne 0xffffff7f // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 740a | je 0xc // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 51 | push ecx // ff15???????? | $sequence_29 = { 83e20f 8a8c0a00010000 300c18 40 3b4704 72e8 } // n = 6, score = 200 // 83e20f | and edx, 0xf // 8a8c0a00010000 | mov cl, byte ptr [edx + ecx + 0x100] // 300c18 | xor byte ptr [eax + ebx], cl // 40 | inc eax // 3b4704 | cmp eax, dword ptr [edi + 4] // 72e8 | jb 0xffffffea condition: 7 of them and filesize < 417792 }
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