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rule win_ahtapot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.ahtapot." 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.ahtapot" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 6683bc7588fdffff00 8d847588fdffff 75e5 33c9 8d8580fbffff 50 66898c7d88fdffff } // n = 7, score = 100 // 6683bc7588fdffff00 | cmp word ptr [ebp + esi*2 - 0x278], 0 // 8d847588fdffff | lea eax, [ebp + esi*2 - 0x278] // 75e5 | jne 0xffffffe7 // 33c9 | xor ecx, ecx // 8d8580fbffff | lea eax, [ebp - 0x480] // 50 | push eax // 66898c7d88fdffff | mov word ptr [ebp + edi*2 - 0x278], cx $sequence_1 = { e8???????? 53 8d8dd4cbffff 8985dccbffff } // n = 4, score = 100 // e8???????? | // 53 | push ebx // 8d8dd4cbffff | lea ecx, [ebp - 0x342c] // 8985dccbffff | mov dword ptr [ebp - 0x3424], eax $sequence_2 = { 7407 47 3bf8 7cf5 eb08 897df8 83ffff } // n = 7, score = 100 // 7407 | je 9 // 47 | inc edi // 3bf8 | cmp edi, eax // 7cf5 | jl 0xfffffff7 // eb08 | jmp 0xa // 897df8 | mov dword ptr [ebp - 8], edi // 83ffff | cmp edi, -1 $sequence_3 = { 8bfe 46 6683bc7588fdffff00 8d847588fdffff 75e5 33c9 } // n = 6, score = 100 // 8bfe | mov edi, esi // 46 | inc esi // 6683bc7588fdffff00 | cmp word ptr [ebp + esi*2 - 0x278], 0 // 8d847588fdffff | lea eax, [ebp + esi*2 - 0x278] // 75e5 | jne 0xffffffe7 // 33c9 | xor ecx, ecx $sequence_4 = { 68???????? e8???????? 59 c3 c705????????bc624200 b9???????? e9???????? } // n = 7, score = 100 // 68???????? | // e8???????? | // 59 | pop ecx // c3 | ret // c705????????bc624200 | // b9???????? | // e9???????? | $sequence_5 = { 6a00 51 e8???????? 83c40c 8d95bcfbffff } // n = 5, score = 100 // 6a00 | push 0 // 51 | push ecx // e8???????? | // 83c40c | add esp, 0xc // 8d95bcfbffff | lea edx, [ebp - 0x444] $sequence_6 = { 83c40c 83bd18ecffff00 7607 68???????? eb4d 8b851cecffff 3d00001000 } // n = 7, score = 100 // 83c40c | add esp, 0xc // 83bd18ecffff00 | cmp dword ptr [ebp - 0x13e8], 0 // 7607 | jbe 9 // 68???????? | // eb4d | jmp 0x4f // 8b851cecffff | mov eax, dword ptr [ebp - 0x13e4] // 3d00001000 | cmp eax, 0x100000 $sequence_7 = { 8b3d???????? 50 56 8d8e6c020000 51 8d95e0eeffff 68???????? } // n = 7, score = 100 // 8b3d???????? | // 50 | push eax // 56 | push esi // 8d8e6c020000 | lea ecx, [esi + 0x26c] // 51 | push ecx // 8d95e0eeffff | lea edx, [ebp - 0x1120] // 68???????? | $sequence_8 = { 50 b878140000 e8???????? a1???????? 33c5 8945ec } // n = 6, score = 100 // 50 | push eax // b878140000 | mov eax, 0x1478 // e8???????? | // a1???????? | // 33c5 | xor eax, ebp // 8945ec | mov dword ptr [ebp - 0x14], eax $sequence_9 = { eb12 8b45e0 8a80ecda4200 08443b1d 0fb64601 } // n = 5, score = 100 // eb12 | jmp 0x14 // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 8a80ecda4200 | mov al, byte ptr [eax + 0x42daec] // 08443b1d | or byte ptr [ebx + edi + 0x1d], al // 0fb64601 | movzx eax, byte ptr [esi + 1] condition: 7 of them and filesize < 430080 }
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