Actor(s): Lazarus Group
There is no description at this point.
rule win_bankshot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.bankshot." 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.bankshot" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 8bf8 8d5101 8a01 41 84c0 75f9 57 } // n = 7, score = 300 // 8bf8 | dec eax // 8d5101 | lea ecx, [0x961e] // 8a01 | mov ebx, eax // 41 | test ecx, ecx // 84c0 | jne 0x1bb // 75f9 | dec eax // 57 | lea ecx, [esp + 0x350] $sequence_1 = { 8bec 81ec48040000 a1???????? 33c5 8945f8 53 } // n = 6, score = 300 // 8bec | dec eax // 81ec48040000 | mov dword ptr [esp + 0x30], 0x80000002 // a1???????? | // 33c5 | dec eax // 8945f8 | lea ecx, [esp + 0x240] // 53 | xor edx, edx $sequence_2 = { e9???????? 57 33ff 8bcf 8bc7 894de4 3998c0e10110 } // n = 7, score = 200 // e9???????? | // 57 | or byte ptr [esi + edx + 0x19], al // 33ff | mov eax, edi // 8bcf | mov dword ptr [ebp - 0x1c], ecx // 8bc7 | cmp dword ptr [eax + 0x1001e1c0], ebx // 894de4 | je 0xf9 // 3998c0e10110 | test ebx, ebx $sequence_3 = { c74048b8e40110 8b4508 6689486c 8b4508 66898872010000 8b4508 83a04c03000000 } // n = 7, score = 200 // c74048b8e40110 | jbe 0xfffffff2 // 8b4508 | mov eax, dword ptr [ebp + 8] // 6689486c | mov dword ptr [eax + 0x350], ecx // 8b4508 | mov eax, dword ptr [ebp + 8] // 66898872010000 | pop ecx // 8b4508 | mov dword ptr [eax + 0x48], 0x1001e4b8 // 83a04c03000000 | mov eax, dword ptr [ebp + 8] $sequence_4 = { 33c9 33d2 66898c45f47fffff 8d8df47fffff 8d7102 668b01 83c102 } // n = 7, score = 200 // 33c9 | mov edi, eax // 33d2 | lea edx, [ecx + 1] // 66898c45f47fffff | mov al, byte ptr [ecx] // 8d8df47fffff | inc ecx // 8d7102 | test al, al // 668b01 | jne 5 // 83c102 | push edi $sequence_5 = { 89855c38ffff fec1 888d6438ffff 85fa 0f84a4000000 } // n = 5, score = 200 // 89855c38ffff | xor byte ptr [ebp + ecx - 0xc26c], 0xaa // fec1 | inc ecx // 888d6438ffff | cmp ecx, edx // 85fa | jl 4 // 0f84a4000000 | cmp dword ptr [ebp - 0xc26c], 0x2000 $sequence_6 = { 8b45fc 817848b8e40110 7409 ff7048 e8???????? } // n = 5, score = 200 // 8b45fc | lea ecx, [ebp - 0x110] // 817848b8e40110 | push ecx // 7409 | lea edx, [ebp - 0x118] // ff7048 | mov ecx, dword ptr [edx*4 + 0x7188c8] // e8???????? | $sequence_7 = { 0f84a6000000 680c400000 8d85e4bfffff 53 50 } // n = 5, score = 200 // 0f84a6000000 | mov ebp, esp // 680c400000 | sub esp, 0x448 // 8d85e4bfffff | xor eax, ebp // 53 | mov dword ptr [ebp - 8], eax // 50 | push ebx $sequence_8 = { 680c000200 e8???????? 8bf8 83c404 85ff 0f8429060000 6915????????04010000 } // n = 7, score = 200 // 680c000200 | mov word ptr [ebp + eax*2 - 0x800c], cx // e8???????? | // 8bf8 | lea ecx, [ebp - 0x800c] // 83c404 | lea esi, [ecx + 2] // 85ff | mov ax, word ptr [ecx] // 0f8429060000 | add ecx, 2 // 6915????????04010000 | $sequence_9 = { 83c40c 8d85bcbaffff 33f6 6828050000 56 50 } // n = 6, score = 200 // 83c40c | jae 0xdf2 // 8d85bcbaffff | lea ecx, [ebp - 0xc260] // 33f6 | lea edx, [ecx + 1] // 6828050000 | mov al, byte ptr [ecx] // 56 | inc ecx // 50 | test al, al $sequence_10 = { e8???????? 83c40c e8???????? 99 b907000000 } // n = 5, score = 200 // e8???????? | // 83c40c | mov eax, dword ptr [ebx*4 + 0x10017fc8] // e8???????? | // 99 | mov dword ptr [ebp - 0x2c], eax // b907000000 | mov dword ptr [ebp - 0x18], edx $sequence_11 = { e8???????? 83c404 89861c020000 8b45e0 8d4e0c 6a06 8d90c4e10110 } // n = 7, score = 200 // e8???????? | // 83c404 | mov eax, dword ptr [ebp - 4] // 89861c020000 | cmp dword ptr [eax + 0x48], 0x1001e4b8 // 8b45e0 | je 0x18 // 8d4e0c | push dword ptr [eax + 0x48] // 6a06 | cmp dword ptr [eax + 0x1001e1c0], ebx // 8d90c4e10110 | je 0xf0 $sequence_12 = { 0f1f4000 80b40d943dffffaa 41 3bca 7cf3 } // n = 5, score = 200 // 0f1f4000 | push ebp // 80b40d943dffffaa | mov ebp, esp // 41 | sub esp, 0x448 // 3bca | xor eax, ebp // 7cf3 | mov dword ptr [ebp - 8], eax $sequence_13 = { c700???????? 8b4508 898850030000 8b4508 59 c74048b8e40110 } // n = 6, score = 200 // c700???????? | // 8b4508 | lea edx, [eax + 0x1001e1c4] // 898850030000 | mov al, byte ptr [edi + 0x1001e1bc] // 8b4508 | or byte ptr [esi + edx + 0x19], al // 59 | inc edx // c74048b8e40110 | movzx eax, byte ptr [ecx + 1] $sequence_14 = { 50 e8???????? 83c40c 6b45e430 8945e0 8d80d0e10110 } // n = 6, score = 200 // 50 | mov eax, dword ptr [ebp + 8] // e8???????? | // 83c40c | pop ecx // 6b45e430 | mov dword ptr [eax + 0x48], 0x1001e4b8 // 8945e0 | mov eax, dword ptr [ebp + 8] // 8d80d0e10110 | mov dword ptr [ebp - 0x20], eax $sequence_15 = { 8b542420 8987d0000000 8b442424 898fd4000000 8917 } // n = 5, score = 100 // 8b542420 | add esp, 4 // 8987d0000000 | jmp 0x3b // 8b442424 | lea edx, [ebx + 0xc] // 898fd4000000 | push 1 // 8917 | lea ecx, [esp + 0x14] $sequence_16 = { e8???????? 488d0de7030000 e8???????? 33c0 4883c420 } // n = 5, score = 100 // e8???????? | // 488d0de7030000 | mov dword ptr [esp + 0x60], ebp // e8???????? | // 33c0 | mov ebx, ebp // 4883c420 | dec eax $sequence_17 = { 488d0d1e960000 c705????????30000000 8bd8 c705????????02000000 48c705????????07000000 48893d???????? } // n = 6, score = 100 // 488d0d1e960000 | lea edx, [0x5358] // c705????????30000000 | // 8bd8 | inc ebp // c705????????02000000 | // 48c705????????07000000 | // 48893d???????? | $sequence_18 = { 8b0c95c8887100 8844192e 8b0495c8887100 804c182d04 ff4604 eb08 } // n = 6, score = 100 // 8b0c95c8887100 | cdq // 8844192e | mov ecx, 7 // 8b0495c8887100 | idiv ecx // 804c182d04 | add esp, 0xc // ff4604 | cdq // eb08 | mov ecx, 7 $sequence_19 = { 51 ff15???????? 8bf0 83feff 89742410 7544 ff15???????? } // n = 7, score = 100 // 51 | push 0 // ff15???????? | // 8bf0 | push 3 // 83feff | lea eax, [esp + 0x4c0] // 89742410 | push 0xc0000000 // 7544 | push eax // ff15???????? | $sequence_20 = { ff15???????? 68???????? 57 8985bcfbffff } // n = 4, score = 100 // ff15???????? | // 68???????? | // 57 | jne 5 // 8985bcfbffff | push edi $sequence_21 = { 48c744243002000080 e8???????? 488d8c2440020000 33d2 } // n = 4, score = 100 // 48c744243002000080 | inc ecx // e8???????? | // 488d8c2440020000 | mov ecx, 0x58 // 33d2 | dec eax $sequence_22 = { 52 8d85c4fbffff 50 ff15???????? 8d8dd0fdffff } // n = 5, score = 100 // 52 | mov edx, dword ptr [esp + 0x20] // 8d85c4fbffff | mov dword ptr [edi + 0xd0], eax // 50 | mov eax, dword ptr [esp + 0x24] // ff15???????? | // 8d8dd0fdffff | mov dword ptr [edi + 0xd4], ecx $sequence_23 = { 57 83e502 4d ff15???????? 85f6 7407 } // n = 6, score = 100 // 57 | add esp, 0xc // 83e502 | cdq // 4d | mov ecx, 7 // ff15???????? | // 85f6 | idiv ecx // 7407 | add esp, 0xc $sequence_24 = { 8d1c85b4ef0110 33c0 f00fb10b 8b15???????? 83cfff 8bca } // n = 6, score = 100 // 8d1c85b4ef0110 | imul esi, esi, 0x30 // 33c0 | mov ecx, dword ptr [ecx*4 + 0x1001f180] // f00fb10b | and byte ptr [ecx + esi + 0x28], 0xfd // 8b15???????? | // 83cfff | pop edi // 8bca | pop esi $sequence_25 = { 7508 8b36 85f6 75e7 eb3a 81c694010000 } // n = 6, score = 100 // 7508 | ret 4 // 8b36 | mov ecx, dword ptr [esp + 0x3c1c] // 85f6 | or eax, 0xffffffff // 75e7 | jne 0x33 // eb3a | mov dword ptr [edi*4 + 0x10017fc8], eax // 81c694010000 | test eax, eax $sequence_26 = { e9???????? 8d8df0feffff 51 8d95e8feffff } // n = 4, score = 100 // e9???????? | // 8d8df0feffff | cdq // 51 | mov ecx, 7 // 8d95e8feffff | add esp, 0xc $sequence_27 = { ff15???????? 8b8df8f3ffff c7410800000000 8b95f8f3ffff 837a0400 } // n = 5, score = 100 // ff15???????? | // 8b8df8f3ffff | add esp, 0xc // c7410800000000 | cdq // 8b95f8f3ffff | mov ecx, 7 // 837a0400 | add esp, 0xc $sequence_28 = { 8dbc24de040000 668974245c f3ab 66ab } // n = 4, score = 100 // 8dbc24de040000 | cdq // 668974245c | mov ecx, 7 // f3ab | idiv ecx // 66ab | push 3 $sequence_29 = { 85c9 0f85b5010000 488d8c2450030000 e8???????? e9???????? 498d4906 } // n = 6, score = 100 // 85c9 | lea eax, [ecx - 0x2a] // 0f85b5010000 | dec eax // 488d8c2450030000 | lea eax, [esp + 0x38] // e8???????? | // e9???????? | // 498d4906 | dec eax $sequence_30 = { ff15???????? 41b958000000 488d1558530000 458d41d6 } // n = 4, score = 100 // ff15???????? | // 41b958000000 | inc ecx // 488d1558530000 | mov eax, 0x4000 // 458d41d6 | dec eax $sequence_31 = { 8895affbffff 8b859cfbffff 8a8daffbffff 8808 8b9588fbffff } // n = 5, score = 100 // 8895affbffff | idiv ecx // 8b859cfbffff | push edx // 8a8daffbffff | lea eax, [ebp - 0x43c] // 8808 | push eax // 8b9588fbffff | lea ecx, [ebp - 0x230] $sequence_32 = { 8b15???????? 6a01 8d4c2414 6a04 51 8944241c } // n = 6, score = 100 // 8b15???????? | // 6a01 | cdq // 8d4c2414 | mov ecx, 7 // 6a04 | add esp, 0xc // 51 | cdq // 8944241c | mov ecx, 7 $sequence_33 = { c1f906 6bc030 03048d80f10110 50 ff15???????? 5d } // n = 6, score = 100 // c1f906 | cmp ecx, dword ptr [eax*8 + 0x10017b20] // 6bc030 | je 0x37 // 03048d80f10110 | inc eax // 50 | mov dword ptr [ebp - 0x20], 0x1001bae0 // ff15???????? | // 5d | jmp 0xffffffbd $sequence_34 = { 33cc e8???????? 8be5 5d c20400 8b8c241c3c0000 83c8ff } // n = 7, score = 100 // 33cc | mov ebp, esp // e8???????? | // 8be5 | sub esp, 0x448 // 5d | xor eax, ebp // c20400 | mov dword ptr [ebp - 8], eax // 8b8c241c3c0000 | push ebx // 83c8ff | mov edi, eax $sequence_35 = { 7531 e8???????? 8904bdc87f0110 85c0 7514 } // n = 5, score = 100 // 7531 | lea edx, [ecx + 1] // e8???????? | // 8904bdc87f0110 | mov al, byte ptr [ecx] // 85c0 | inc ecx // 7514 | test al, al $sequence_36 = { 6a03 6a00 6a03 8d8424c0040000 68000000c0 50 ff15???????? } // n = 7, score = 100 // 6a03 | jne 0xffffffef // 6a00 | jmp 0x44 // 6a03 | add esi, 0x194 // 8d8424c0040000 | jmp 5 // 68000000c0 | push eax // 50 | push -0xa // ff15???????? | $sequence_37 = { 33d2 488bc8 4889742448 ff15???????? 896c2460 8bdd } // n = 6, score = 100 // 33d2 | xor edx, edx // 488bc8 | dec eax // 4889742448 | mov ecx, eax // ff15???????? | // 896c2460 | dec eax // 8bdd | mov dword ptr [esp + 0x48], esi $sequence_38 = { 488d9560040000 41b800400000 488bce 89442460 89442468 4889442420 ff15???????? } // n = 7, score = 100 // 488d9560040000 | lea ecx, [0x3e7] // 41b800400000 | xor eax, eax // 488bce | dec eax // 89442460 | add esp, 0x20 // 89442468 | dec eax // 4889442420 | lea edx, [ebp + 0x460] // ff15???????? | $sequence_39 = { e8???????? 83c404 eb36 8d530c } // n = 4, score = 100 // e8???????? | // 83c404 | mov eax, dword ptr [edi*4 + 0x10017fc8] // eb36 | or dword ptr [ebx + eax + 0x18], 0xffffffff // 8d530c | add esp, 0xc $sequence_40 = { 8d7201 8a0a 42 84c9 75f9 6a00 } // n = 6, score = 100 // 8d7201 | xor eax, ebp // 8a0a | mov dword ptr [ebp - 8], eax // 42 | push ebx // 84c9 | xor ecx, esp // 75f9 | mov esp, ebp // 6a00 | pop ebp $sequence_41 = { 8815???????? 488d442438 488d353a490000 41b919000200 4533c0 48c7c102000080 } // n = 6, score = 100 // 8815???????? | // 488d442438 | mov ecx, esi // 488d353a490000 | mov dword ptr [esp + 0x60], eax // 41b919000200 | mov dword ptr [esp + 0x68], eax // 4533c0 | dec eax // 48c7c102000080 | mov dword ptr [esp + 0x20], eax $sequence_42 = { 6bd030 895de4 8b049dc87f0110 8945d4 8955e8 8a5c1029 80fb02 } // n = 7, score = 100 // 6bd030 | sub esp, 0x448 // 895de4 | xor eax, ebp // 8b049dc87f0110 | mov dword ptr [ebp - 8], eax // 8945d4 | push ebx // 8955e8 | push ebp // 8a5c1029 | mov ebp, esp // 80fb02 | sub esp, 0x448 $sequence_43 = { 8b8544d4ffff 83c001 6689856cd4ffff 8a4d1c } // n = 4, score = 100 // 8b8544d4ffff | push ecx // 83c001 | mov ecx, dword ptr [ebp - 4] // 6689856cd4ffff | mov eax, 1 // 8a4d1c | mov esp, ebp $sequence_44 = { 51 68???????? 8b4dfc e8???????? b801000000 8be5 } // n = 6, score = 100 // 51 | mov dword ptr [edi], edx // 68???????? | // 8b4dfc | push 0xa00 // e8???????? | // b801000000 | push 0x1990 // 8be5 | push eax condition: 7 of them and filesize < 860160 }
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