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rule win_floki_bot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 81ec04010000 53 56 57 8b7d08 33db 53 } // n = 7, score = 1100 // 81ec04010000 | sub esp, 0x104 // 53 | push ebx // 56 | push esi // 57 | push edi // 8b7d08 | mov edi, dword ptr [ebp + 8] // 33db | xor ebx, ebx // 53 | push ebx $sequence_1 = { 50 e8???????? 8b7d14 8d442420 50 8d5c2414 } // n = 6, score = 1100 // 50 | push eax // e8???????? | // 8b7d14 | mov edi, dword ptr [ebp + 0x14] // 8d442420 | lea eax, [esp + 0x20] // 50 | push eax // 8d5c2414 | lea ebx, [esp + 0x14] $sequence_2 = { 83c420 85c0 0f9545ff 80bf3403000000 7405 e8???????? } // n = 6, score = 1100 // 83c420 | add esp, 0x20 // 85c0 | test eax, eax // 0f9545ff | setne byte ptr [ebp - 1] // 80bf3403000000 | cmp byte ptr [edi + 0x334], 0 // 7405 | je 7 // e8???????? | $sequence_3 = { e9???????? 8b4514 85c0 7403 832000 837f18ff 0f8503010000 } // n = 7, score = 1100 // e9???????? | // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 85c0 | test eax, eax // 7403 | je 5 // 832000 | and dword ptr [eax], 0 // 837f18ff | cmp dword ptr [edi + 0x18], -1 // 0f8503010000 | jne 0x109 $sequence_4 = { 40 8a08 80f93d 75ed eb02 32db 33ff } // n = 7, score = 1100 // 40 | inc eax // 8a08 | mov cl, byte ptr [eax] // 80f93d | cmp cl, 0x3d // 75ed | jne 0xffffffef // eb02 | jmp 4 // 32db | xor bl, bl // 33ff | xor edi, edi $sequence_5 = { ff15???????? 56 6a04 8d450c 50 8d45e8 } // n = 6, score = 1100 // ff15???????? | // 56 | push esi // 6a04 | push 4 // 8d450c | lea eax, [ebp + 0xc] // 50 | push eax // 8d45e8 | lea eax, [ebp - 0x18] $sequence_6 = { 897df4 3bf7 0f83a0000000 8b450c 83e002 8945f0 } // n = 6, score = 1100 // 897df4 | mov dword ptr [ebp - 0xc], edi // 3bf7 | cmp esi, edi // 0f83a0000000 | jae 0xa6 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 83e002 | and eax, 2 // 8945f0 | mov dword ptr [ebp - 0x10], eax $sequence_7 = { 50 e8???????? 83f8ff 743b 8b4dfc 8d75f0 e8???????? } // n = 7, score = 1100 // 50 | push eax // e8???????? | // 83f8ff | cmp eax, -1 // 743b | je 0x3d // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 8d75f0 | lea esi, [ebp - 0x10] // e8???????? | $sequence_8 = { e8???????? 84c0 7475 8365d800 33c0 40 6a10 } // n = 7, score = 1100 // e8???????? | // 84c0 | test al, al // 7475 | je 0x77 // 8365d800 | and dword ptr [ebp - 0x28], 0 // 33c0 | xor eax, eax // 40 | inc eax // 6a10 | push 0x10 $sequence_9 = { 895c2470 895c246c 895c2468 e8???????? 8bf0 3bf3 740b } // n = 7, score = 1100 // 895c2470 | mov dword ptr [esp + 0x70], ebx // 895c246c | mov dword ptr [esp + 0x6c], ebx // 895c2468 | mov dword ptr [esp + 0x68], ebx // e8???????? | // 8bf0 | mov esi, eax // 3bf3 | cmp esi, ebx // 740b | je 0xd condition: 7 of them and filesize < 286720 }
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