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 = "2024-10-31" 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 = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 | lea ecx, [esp + 0x58] // 8d5101 | push 0x1484 // 8a01 | push edx // 41 | mov esi, eax // 84c0 | add esp, 0x14 // 75f9 | neg esi // 57 | sbb esi, esi $sequence_1 = { 81ec48040000 a1???????? 33c5 8945f8 53 } // n = 5, score = 300 // 81ec48040000 | mov ecx, dword ptr [esp + 0x30] // a1???????? | // 33c5 | mov dword ptr [eax + 4], ebp // 8945f8 | mov dword ptr [eax + 8], edx // 53 | mov dword ptr [eax + 0xc], ecx $sequence_2 = { 7ccb 3bca 0f8d20f8ffff 0f1f00 80b40ddc3dffffaa 41 } // n = 6, score = 200 // 7ccb | inc ecx // 3bca | test al, al // 0f8d20f8ffff | jne 3 // 0f1f00 | push edi // 80b40ddc3dffffaa | cmp edx, -1 // 41 | je 0x7d $sequence_3 = { 83faff 747b 33c9 85d2 7e77 } // n = 5, score = 200 // 83faff | jbe 0xfffffff2 // 747b | mov ebp, esp // 33c9 | sub esp, 0x448 // 85d2 | xor eax, ebp // 7e77 | mov dword ptr [ebp - 8], eax $sequence_4 = { 83c40c e8???????? 99 b907000000 } // n = 4, score = 200 // 83c40c | or edx, 0xffffffff // e8???????? | // 99 | dec eax // b907000000 | lea ecx, [0x33e3] $sequence_5 = { 57 50 e8???????? 83c40c 6b45e430 8945e0 8d80d0e10110 } // n = 7, score = 200 // 57 | mov eax, dword ptr [ecx*4 + 0x7188c8] // 50 | sub esp, 0x448 // e8???????? | // 83c40c | xor eax, ebp // 6b45e430 | mov dword ptr [ebp - 8], eax // 8945e0 | push ebx // 8d80d0e10110 | mov ebp, esp $sequence_6 = { 8d90c4e10110 5f 668b02 8d5202 668901 8d4902 83ef01 } // n = 7, score = 200 // 8d90c4e10110 | inc edx // 5f | dec ebx // 668b02 | jne 0x17 // 8d5202 | mov eax, dword ptr [ebp - 4] // 668901 | cmp dword ptr [eax + 0x48], 0x1001e4b8 // 8d4902 | mov eax, dword ptr [eax + 0x48] // 83ef01 | lock xadd dword ptr [eax], ebx $sequence_7 = { 8bb5a838ffff 8d8db438ffff 68???????? 894608 c70610000000 c7460400000000 } // n = 6, score = 200 // 8bb5a838ffff | xor ecx, ecx // 8d8db438ffff | test edx, edx // 68???????? | // 894608 | jle 0x7f // c70610000000 | call edi // c7460400000000 | mov dword ptr [ebp - 0xc540], 0 $sequence_8 = { 8945e0 8d80d0e10110 8945e4 803800 8bc8 7435 8a4101 } // n = 7, score = 200 // 8945e0 | mov ecx, edi // 8d80d0e10110 | mov eax, edi // 8945e4 | mov dword ptr [ebp - 0x1c], ecx // 803800 | cmp dword ptr [eax + 0x1001e1c0], ebx // 8bc8 | je 0xf0 // 7435 | inc ecx // 8a4101 | lea edx, [eax + 0x1001e1c4] $sequence_9 = { ffd7 c785c03affff00000000 8b85bc3affff 85c0 } // n = 4, score = 200 // ffd7 | push ebx // c785c03affff00000000 | push ebp // 8b85bc3affff | mov ebp, esp // 85c0 | sub esp, 0x448 $sequence_10 = { 85db 7507 c746340c7b0110 57 ff7634 } // n = 5, score = 200 // 85db | add esp, 0xc // 7507 | imul eax, dword ptr [ebp - 0x1c], 0x30 // c746340c7b0110 | mov dword ptr [ebp - 0x20], eax // 57 | lea eax, [eax + 0x1001e1d0] // ff7634 | cmp dword ptr [eax + 0x48], 0x1001e4b8 $sequence_11 = { e8???????? 83c404 89861c020000 8b45e0 8d4e0c 6a06 8d90c4e10110 } // n = 7, score = 200 // e8???????? | // 83c404 | mov dword ptr [eax + 0x48], 0x1001e4b8 // 89861c020000 | mov eax, dword ptr [ebp + 8] // 8b45e0 | mov word ptr [eax + 0x6c], cx // 8d4e0c | mov eax, dword ptr [ebp + 8] // 6a06 | lock xadd dword ptr [eax], ebx // 8d90c4e10110 | dec ebx $sequence_12 = { 7515 8b45fc 817848b8e40110 7409 ff7048 e8???????? 59 } // n = 7, score = 200 // 7515 | mov edi, eax // 8b45fc | lea edx, [ecx + 1] // 817848b8e40110 | mov al, byte ptr [ecx] // 7409 | inc ecx // ff7048 | test al, al // e8???????? | // 59 | jne 3 $sequence_13 = { c7832005000000008000 eb4e b9???????? 8d85d4fdffff } // n = 4, score = 200 // c7832005000000008000 | xor eax, ebp // eb4e | mov dword ptr [ebp - 8], eax // b9???????? | // 8d85d4fdffff | push ebx $sequence_14 = { e9???????? 57 33ff 8bcf 8bc7 894de4 3998c0e10110 } // n = 7, score = 200 // e9???????? | // 57 | jne 0x17 // 33ff | mov eax, dword ptr [ebp - 4] // 8bcf | cmp dword ptr [eax + 0x48], 0x1001e4b8 // 8bc7 | je 0x15 // 894de4 | push dword ptr [eax + 0x48] // 3998c0e10110 | pop ecx $sequence_15 = { 8b4508 c700???????? 8b4508 898850030000 8b4508 59 c74048b8e40110 } // n = 7, score = 200 // 8b4508 | push 6 // c700???????? | // 8b4508 | lea edx, [eax + 0x1001e1c4] // 898850030000 | pop edi // 8b4508 | mov ax, word ptr [edx] // 59 | lea edx, [edx + 2] // c74048b8e40110 | mov word ptr [ecx], ax $sequence_16 = { 0f10440b10 0f28ca 660fefc8 0f114c0b10 83c120 3bce 7cd9 } // n = 7, score = 200 // 0f10440b10 | sub esp, 0x448 // 0f28ca | xor eax, ebp // 660fefc8 | mov dword ptr [ebp - 8], eax // 0f114c0b10 | push ebx // 83c120 | mov edi, eax // 3bce | lea edx, [ecx + 1] // 7cd9 | mov al, byte ptr [ecx] $sequence_17 = { 33c0 8996a0af0600 668b04dd66734100 83fb02 898694af0600 } // n = 5, score = 100 // 33c0 | dec eax // 8996a0af0600 | lea edx, [0xe75e] // 668b04dd66734100 | dec eax // 83fb02 | lea ecx, [esp + 0x20] // 898694af0600 | add esp, 0xc $sequence_18 = { 83c101 894df8 837df803 0f83d2000000 6a04 } // n = 5, score = 100 // 83c101 | cdq // 894df8 | mov ecx, 7 // 837df803 | idiv ecx // 0f83d2000000 | add esp, 0xc // 6a04 | cdq $sequence_19 = { eb3a 81c694010000 740e f30f7e06 660fd685ccfeffff eb24 } // n = 6, score = 100 // eb3a | mov dword ptr [ebp - 8], eax // 81c694010000 | push ebx // 740e | mov ebp, esp // f30f7e06 | sub esp, 0x448 // 660fd685ccfeffff | xor eax, ebp // eb24 | mov dword ptr [ebp - 8], eax $sequence_20 = { 7506 8d4707 50 eb01 57 8d7e10 } // n = 6, score = 100 // 7506 | push ebx // 8d4707 | cmp edx, 0x3e7 // 50 | ja 0xa // eb01 | add edx, 0x3e8 // 57 | mov dword ptr [eax], edx // 8d7e10 | mov ecx, dword ptr [ebx] $sequence_21 = { 894df8 837dd8ff 7464 6a00 } // n = 4, score = 100 // 894df8 | push edi // 837dd8ff | lea edi, [esi + 0x10] // 7464 | push edi // 6a00 | mov dword ptr [ebp - 0x434], eax $sequence_22 = { ff15???????? 4885c0 0f8482000000 48ffc3 4a89042f 488d3cdd00000000 } // n = 6, score = 100 // ff15???????? | // 4885c0 | lea edx, [0xea56] // 0f8482000000 | dec eax // 48ffc3 | lea ecx, [esp + 0x20] // 4a89042f | cmp byte ptr [esp + 0x20], 0 // 488d3cdd00000000 | dec eax $sequence_23 = { 41 890d???????? 33c0 8b4df4 64890d00000000 } // n = 5, score = 100 // 41 | push 0 // 890d???????? | // 33c0 | mov ebp, esp // 8b4df4 | mov eax, dword ptr [ebp + 8] // 64890d00000000 | push edi $sequence_24 = { 44897c2420 ff15???????? 488bf8 83caff } // n = 4, score = 100 // 44897c2420 | dec eax // ff15???????? | // 488bf8 | lea edi, [ebx*8] // 83caff | inc esp $sequence_25 = { 0f84b6000000 488d3ded3e0000 498bf0 b903000000 f3a6 } // n = 5, score = 100 // 0f84b6000000 | inc edi // 488d3ded3e0000 | dec eax // 498bf0 | add ebx, 0x28 // b903000000 | inc esp // f3a6 | mov dword ptr [esp + 0x20], edi $sequence_26 = { ba7a341200 488bcf 8905???????? e8???????? 488d0d7d2b0000 } // n = 5, score = 100 // ba7a341200 | add edx, esp // 488bcf | dec eax // 8905???????? | // e8???????? | // 488d0d7d2b0000 | mov eax, dword ptr [esi + 0x1c] $sequence_27 = { 23f0 68???????? 89b564f2ffff ffd7 68???????? 50 ffd3 } // n = 7, score = 100 // 23f0 | push ebx // 68???????? | // 89b564f2ffff | push ebp // ffd7 | mov ebp, esp // 68???????? | // 50 | sub esp, 0x448 // ffd3 | xor eax, ebp $sequence_28 = { 81fae7030000 7708 81c2e8030000 8910 8b0b 6a00 68e6210000 } // n = 7, score = 100 // 81fae7030000 | mov ecx, ebx // 7708 | mov edi, eax // 81c2e8030000 | lea edx, [ecx + 1] // 8910 | mov al, byte ptr [ecx] // 8b0b | inc ecx // 6a00 | test al, al // 68e6210000 | jne 3 $sequence_29 = { c705????????01000000 c705????????05000000 66c705????????3c00 c705????????04000000 e8???????? 68???????? } // n = 6, score = 100 // c705????????01000000 | // c705????????05000000 | // 66c705????????3c00 | // c705????????04000000 | // e8???????? | // 68???????? | $sequence_30 = { 0f859b010000 c745e068410110 8b4508 8bcf } // n = 4, score = 100 // 0f859b010000 | push edi // c745e068410110 | sub esp, 0x448 // 8b4508 | xor eax, ebp // 8bcf | mov dword ptr [ebp - 8], eax $sequence_31 = { 85c0 7543 8b542454 8d4c2458 6884140000 } // n = 5, score = 100 // 85c0 | cdq // 7543 | mov ecx, 7 // 8b542454 | add esp, 0xc // 8d4c2458 | cdq // 6884140000 | mov ecx, 7 $sequence_32 = { ff15???????? 68???????? 57 8985ccfbffff ff15???????? } // n = 5, score = 100 // ff15???????? | // 68???????? | // 57 | push 0 // 8985ccfbffff | push 0x21e6 // ff15???????? | $sequence_33 = { 8bec 8b4508 57 8d3c85108c7100 8b0f 85c9 } // n = 6, score = 100 // 8bec | mov ecx, dword ptr [eax*4 + 0x10017fc8] // 8b4508 | mov eax, dword ptr [ebp - 0x18] // 57 | test byte ptr [ecx + eax + 0x28], 0x80 // 8d3c85108c7100 | je 0x50 // 8b0f | movsx eax, bl // 85c9 | add esp, 0xc $sequence_34 = { 52 e8???????? 8bf0 83c414 f7de 1bf6 } // n = 6, score = 100 // 52 | add esp, 0xc // e8???????? | // 8bf0 | cdq // 83c414 | mov ecx, 7 // f7de | idiv ecx // 1bf6 | add esp, 0xc $sequence_35 = { 837d0c00 7455 8b4d0c 51 ff15???????? } // n = 5, score = 100 // 837d0c00 | mov ecx, 7 // 7455 | add esp, 0xc // 8b4d0c | cdq // 51 | mov ecx, 7 // ff15???????? | $sequence_36 = { ff15???????? 488d1556ea0000 488d4c2420 488905???????? ff15???????? 807c242000 } // n = 6, score = 100 // ff15???????? | // 488d1556ea0000 | test eax, eax // 488d4c2420 | je 0xbb // 488905???????? | // ff15???????? | // 807c242000 | dec eax $sequence_37 = { 448bc1 4a8d4c0d00 4903d4 e8???????? 488b461c ffc7 4883c328 } // n = 7, score = 100 // 448bc1 | test eax, eax // 4a8d4c0d00 | je 0x88 // 4903d4 | dec eax // e8???????? | // 488b461c | inc ebx // ffc7 | dec edx // 4883c328 | mov dword ptr [edi + ebp], eax $sequence_38 = { 52 50 e8???????? 6a02 8d8c24b0080000 6a00 8d54244c } // n = 7, score = 100 // 52 | push edi // 50 | push 0x1484 // e8???????? | // 6a02 | push 0x40 // 8d8c24b0080000 | mov ebx, eax // 6a00 | xor eax, eax // 8d54244c | mov dword ptr [esi + 0x6afa0], edx $sequence_39 = { 3bd1 7f1e 6b0d????????3c 030d???????? } // n = 4, score = 100 // 3bd1 | add esp, 0xc // 7f1e | cdq // 6b0d????????3c | // 030d???????? | $sequence_40 = { 56 57 6884140000 6a40 ff15???????? 8bd8 } // n = 6, score = 100 // 56 | lea edi, [0x3eed] // 57 | dec ecx // 6884140000 | mov esi, eax // 6a40 | mov ecx, 3 // ff15???????? | // 8bd8 | repe cmpsb byte ptr [esi], byte ptr es:[edi] $sequence_41 = { e8???????? 488d0de3330000 e8???????? 488d0d87990000 e8???????? 84c0 0f85b6000000 } // n = 7, score = 100 // e8???????? | // 488d0de3330000 | mov eax, ecx // e8???????? | // 488d0d87990000 | dec edx // e8???????? | // 84c0 | lea ecx, [ebp + ecx] // 0f85b6000000 | dec ecx $sequence_42 = { 8b4c2430 896804 895008 89480c e8???????? } // n = 5, score = 100 // 8b4c2430 | cdq // 896804 | mov ecx, 7 // 895008 | idiv ecx // 89480c | push esi // e8???????? | $sequence_43 = { 50 e8???????? 83c404 898568f8ffff 8d8df4fdffff 51 } // n = 6, score = 100 // 50 | mov ecx, 7 // e8???????? | // 83c404 | idiv ecx // 898568f8ffff | mov dword ptr [ebp - 8], ecx // 8d8df4fdffff | cmp dword ptr [ebp - 0x28], -1 // 51 | je 0x6a $sequence_44 = { ff15???????? 488bf8 4885c0 0f84b5000000 } // n = 4, score = 100 // ff15???????? | // 488bf8 | dec eax // 4885c0 | mov edi, eax // 0f84b5000000 | dec eax condition: 7 of them and filesize < 860160 }
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