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rule win_floki_bot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.floki_bot." 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.floki_bot" 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 = { 8945ec 8b460c e8???????? 8945f0 8b4610 } // n = 5, score = 1100 // 8945ec | mov dword ptr [ebp - 0x14], eax // 8b460c | mov eax, dword ptr [esi + 0xc] // e8???????? | // 8945f0 | mov dword ptr [ebp - 0x10], eax // 8b4610 | mov eax, dword ptr [esi + 0x10] $sequence_1 = { 7408 33c0 66833b02 eb06 33c0 66833a02 8b4d10 } // n = 7, score = 1100 // 7408 | je 0xa // 33c0 | xor eax, eax // 66833b02 | cmp word ptr [ebx], 2 // eb06 | jmp 8 // 33c0 | xor eax, eax // 66833a02 | cmp word ptr [edx], 2 // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] $sequence_2 = { 5f 8d4c09ff 23c1 c3 53 8b5c2408 } // n = 6, score = 1100 // 5f | pop edi // 8d4c09ff | lea ecx, [ecx + ecx - 1] // 23c1 | and eax, ecx // c3 | ret // 53 | push ebx // 8b5c2408 | mov ebx, dword ptr [esp + 8] $sequence_3 = { 8d1448 8945fc 8955f4 3bc2 0f83bf000000 0fb708 83f920 } // n = 7, score = 1100 // 8d1448 | lea edx, [eax + ecx*2] // 8945fc | mov dword ptr [ebp - 4], eax // 8955f4 | mov dword ptr [ebp - 0xc], edx // 3bc2 | cmp eax, edx // 0f83bf000000 | jae 0xc5 // 0fb708 | movzx ecx, word ptr [eax] // 83f920 | cmp ecx, 0x20 $sequence_4 = { 8d5df0 8a0c17 84c9 7403 880b } // n = 5, score = 1100 // 8d5df0 | lea ebx, [ebp - 0x10] // 8a0c17 | mov cl, byte ptr [edi + edx] // 84c9 | test cl, cl // 7403 | je 5 // 880b | mov byte ptr [ebx], cl $sequence_5 = { 8b5508 66833c4a5c 7405 49 } // n = 4, score = 1100 // 8b5508 | mov edx, dword ptr [ebp + 8] // 66833c4a5c | cmp word ptr [edx + ecx*2], 0x5c // 7405 | je 7 // 49 | dec ecx $sequence_6 = { ff7708 e8???????? 84c0 745e e8???????? } // n = 5, score = 1100 // ff7708 | push dword ptr [edi + 8] // e8???????? | // 84c0 | test al, al // 745e | je 0x60 // e8???????? | $sequence_7 = { 8d04b0 833800 7421 8b00 803800 741a ff75f8 } // n = 7, score = 1100 // 8d04b0 | lea eax, [eax + esi*4] // 833800 | cmp dword ptr [eax], 0 // 7421 | je 0x23 // 8b00 | mov eax, dword ptr [eax] // 803800 | cmp byte ptr [eax], 0 // 741a | je 0x1c // ff75f8 | push dword ptr [ebp - 8] $sequence_8 = { 53 56 68???????? 33db ff15???????? 8bf0 3bf3 } // n = 7, score = 1100 // 53 | push ebx // 56 | push esi // 68???????? | // 33db | xor ebx, ebx // ff15???????? | // 8bf0 | mov esi, eax // 3bf3 | cmp esi, ebx $sequence_9 = { 83f8ff 752f 8b7508 e8???????? 8bf0 3bf7 } // n = 6, score = 1100 // 83f8ff | cmp eax, -1 // 752f | jne 0x31 // 8b7508 | mov esi, dword ptr [ebp + 8] // e8???????? | // 8bf0 | mov esi, eax // 3bf7 | cmp esi, edi condition: 7 of them and filesize < 286720 }
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