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rule win_batel_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.batel." 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.batel" 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 = { 33c0 5b c21000 3b0d???????? 7502 } // n = 5, score = 200 // 33c0 | xor eax, eax // 5b | pop ebx // c21000 | ret 0x10 // 3b0d???????? | // 7502 | jne 4 $sequence_1 = { 68d8202300 ff15???????? 833d????????00 7508 6a01 e8???????? } // n = 6, score = 100 // 68d8202300 | push 0x2320d8 // ff15???????? | // 833d????????00 | // 7508 | jne 0xa // 6a01 | push 1 // e8???????? | $sequence_2 = { 8935???????? 68d0202300 68c4202300 e8???????? 59 } // n = 5, score = 100 // 8935???????? | // 68d0202300 | push 0x2320d0 // 68c4202300 | push 0x2320c4 // e8???????? | // 59 | pop ecx $sequence_3 = { 83c003 41 3d???????? 7cec 56 57 } // n = 6, score = 100 // 83c003 | add eax, 3 // 41 | inc ecx // 3d???????? | // 7cec | jl 0xffffffee // 56 | push esi // 57 | push edi $sequence_4 = { a3???????? 681c302300 6820302300 6818302300 ff15???????? 83c414 a3???????? } // n = 7, score = 100 // a3???????? | // 681c302300 | push 0x23301c // 6820302300 | push 0x233020 // 6818302300 | push 0x233018 // ff15???????? | // 83c414 | add esp, 0x14 // a3???????? | $sequence_5 = { 8b2d???????? 56 57 68a00f0000 } // n = 4, score = 100 // 8b2d???????? | // 56 | push esi // 57 | push edi // 68a00f0000 | push 0xfa0 $sequence_6 = { 68ee020000 ff15???????? 689d020000 8d8561fdffff } // n = 4, score = 100 // 68ee020000 | push 0x2ee // ff15???????? | // 689d020000 | push 0x29d // 8d8561fdffff | lea eax, [ebp - 0x29f] $sequence_7 = { bf01000000 8d642400 68???????? ff15???????? } // n = 4, score = 100 // bf01000000 | mov edi, 1 // 8d642400 | lea esp, [esp] // 68???????? | // ff15???????? | $sequence_8 = { 8da42400000000 68e0202300 ff15???????? 8bf0 } // n = 4, score = 100 // 8da42400000000 | lea esp, [esp] // 68e0202300 | push 0x2320e0 // ff15???????? | // 8bf0 | mov esi, eax $sequence_9 = { c68560fdffff00 e8???????? 83c40c 33c9 b8???????? 8a10 } // n = 6, score = 100 // c68560fdffff00 | mov byte ptr [ebp - 0x2a0], 0 // e8???????? | // 83c40c | add esp, 0xc // 33c9 | xor ecx, ecx // b8???????? | // 8a10 | mov dl, byte ptr [eax] $sequence_10 = { 7412 ffd0 56 ffd3 68005c2605 ffd5 47 } // n = 7, score = 100 // 7412 | je 0x14 // ffd0 | call eax // 56 | push esi // ffd3 | call ebx // 68005c2605 | push 0x5265c00 // ffd5 | call ebp // 47 | inc edi $sequence_11 = { 33c0 40 c20c00 55 8bec 81eca0020000 } // n = 6, score = 100 // 33c0 | xor eax, eax // 40 | inc eax // c20c00 | ret 0xc // 55 | push ebp // 8bec | mov ebp, esp // 81eca0020000 | sub esp, 0x2a0 $sequence_12 = { 68005c2605 ffd5 47 83ff5a 7ccd 5f } // n = 6, score = 100 // 68005c2605 | push 0x5265c00 // ffd5 | call ebp // 47 | inc edi // 83ff5a | cmp edi, 0x5a // 7ccd | jl 0xffffffcf // 5f | pop edi $sequence_13 = { 8db560fdffff f3a5 66a5 ffd0 5f 5e } // n = 6, score = 100 // 8db560fdffff | lea esi, [ebp - 0x2a0] // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 66a5 | movsw word ptr es:[edi], word ptr [esi] // ffd0 | call eax // 5f | pop edi // 5e | pop esi $sequence_14 = { 6800100000 689e020000 6a00 ff15???????? 8bf8 b9a7000000 } // n = 6, score = 100 // 6800100000 | push 0x1000 // 689e020000 | push 0x29e // 6a00 | push 0 // ff15???????? | // 8bf8 | mov edi, eax // b9a7000000 | mov ecx, 0xa7 $sequence_15 = { 689d020000 8d8561fdffff 6a00 50 c68560fdffff00 e8???????? 83c40c } // n = 7, score = 100 // 689d020000 | push 0x29d // 8d8561fdffff | lea eax, [ebp - 0x29f] // 6a00 | push 0 // 50 | push eax // c68560fdffff00 | mov byte ptr [ebp - 0x2a0], 0 // e8???????? | // 83c40c | add esp, 0xc $sequence_16 = { 6a5c 6868212300 e8???????? 33db 895de4 } // n = 5, score = 100 // 6a5c | push 0x5c // 6868212300 | push 0x232168 // e8???????? | // 33db | xor ebx, ebx // 895de4 | mov dword ptr [ebp - 0x1c], ebx $sequence_17 = { 57 68a00f0000 ffd5 8b1d???????? bf01000000 } // n = 5, score = 100 // 57 | push edi // 68a00f0000 | push 0xfa0 // ffd5 | call ebp // 8b1d???????? | // bf01000000 | mov edi, 1 $sequence_18 = { 7454 8b4508 2d00002300 50 6800002300 } // n = 5, score = 100 // 7454 | je 0x56 // 8b4508 | mov eax, dword ptr [ebp + 8] // 2d00002300 | sub eax, 0x230000 // 50 | push eax // 6800002300 | push 0x230000 $sequence_19 = { 56 ff15???????? 85c0 7412 ffd0 56 } // n = 6, score = 100 // 56 | push esi // ff15???????? | // 85c0 | test eax, eax // 7412 | je 0x14 // ffd0 | call eax // 56 | push esi $sequence_20 = { 68b8202300 e8???????? 59 59 c705????????02000000 395ddc } // n = 6, score = 100 // 68b8202300 | push 0x2320b8 // e8???????? | // 59 | pop ecx // 59 | pop ecx // c705????????02000000 | // 395ddc | cmp dword ptr [ebp - 0x24], ebx $sequence_21 = { 83ff5a 7ccd 5f 5e 5d 33c0 } // n = 6, score = 100 // 83ff5a | cmp edi, 0x5a // 7ccd | jl 0xffffffcf // 5f | pop edi // 5e | pop esi // 5d | pop ebp // 33c0 | xor eax, eax $sequence_22 = { ff15???????? 8bf8 b9a7000000 8db560fdffff f3a5 66a5 } // n = 6, score = 100 // ff15???????? | // 8bf8 | mov edi, eax // b9a7000000 | mov ecx, 0xa7 // 8db560fdffff | lea esi, [ebp - 0x2a0] // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 66a5 | movsw word ptr es:[edi], word ptr [esi] condition: 7 of them and filesize < 49152 }
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