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rule win_flowershop_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.flowershop." 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.flowershop" 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 = { d2e2 8b4d10 0ac2 8a140e 8b4d14 225508 8ad8 } // n = 7, score = 500 // d2e2 | shl dl, cl // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 0ac2 | or al, dl // 8a140e | mov dl, byte ptr [esi + ecx] // 8b4d14 | mov ecx, dword ptr [ebp + 0x14] // 225508 | and dl, byte ptr [ebp + 8] // 8ad8 | mov bl, al $sequence_1 = { 8d4804 3bf1 7cd1 8d0c18 81f9d0070000 7fc6 50 } // n = 7, score = 500 // 8d4804 | lea ecx, [eax + 4] // 3bf1 | cmp esi, ecx // 7cd1 | jl 0xffffffd3 // 8d0c18 | lea ecx, [eax + ebx] // 81f9d0070000 | cmp ecx, 0x7d0 // 7fc6 | jg 0xffffffc8 // 50 | push eax $sequence_2 = { 833d????????04 7534 a1???????? 3bc3 742b 8d4d0c } // n = 6, score = 500 // 833d????????04 | // 7534 | jne 0x36 // a1???????? | // 3bc3 | cmp eax, ebx // 742b | je 0x2d // 8d4d0c | lea ecx, [ebp + 0xc] $sequence_3 = { 6875d5cdfb 6a04 56 e8???????? 83c448 8945fc 8d45fc } // n = 7, score = 500 // 6875d5cdfb | push 0xfbcdd575 // 6a04 | push 4 // 56 | push esi // e8???????? | // 83c448 | add esp, 0x48 // 8945fc | mov dword ptr [ebp - 4], eax // 8d45fc | lea eax, [ebp - 4] $sequence_4 = { e8???????? 83c424 85c0 7414 8bce 2bc8 2bc6 } // n = 7, score = 500 // e8???????? | // 83c424 | add esp, 0x24 // 85c0 | test eax, eax // 7414 | je 0x16 // 8bce | mov ecx, esi // 2bc8 | sub ecx, eax // 2bc6 | sub eax, esi $sequence_5 = { 6a04 ff7510 2ad8 80eb05 660fb6cb 6689883c020000 } // n = 6, score = 500 // 6a04 | push 4 // ff7510 | push dword ptr [ebp + 0x10] // 2ad8 | sub bl, al // 80eb05 | sub bl, 5 // 660fb6cb | movzx cx, bl // 6689883c020000 | mov word ptr [eax + 0x23c], cx $sequence_6 = { 53 57 e8???????? 0135???????? 83c418 33c0 } // n = 6, score = 500 // 53 | push ebx // 57 | push edi // e8???????? | // 0135???????? | // 83c418 | add esp, 0x18 // 33c0 | xor eax, eax $sequence_7 = { 1bc0 59 f7d8 59 8906 33c0 5e } // n = 7, score = 500 // 1bc0 | sbb eax, eax // 59 | pop ecx // f7d8 | neg eax // 59 | pop ecx // 8906 | mov dword ptr [esi], eax // 33c0 | xor eax, eax // 5e | pop esi $sequence_8 = { 50 ff15???????? 8325????????00 e9???????? c3 33c0 } // n = 6, score = 500 // 50 | push eax // ff15???????? | // 8325????????00 | // e9???????? | // c3 | ret // 33c0 | xor eax, eax $sequence_9 = { 85c0 7530 837df803 752a 03750c fe45fe 85c0 } // n = 7, score = 500 // 85c0 | test eax, eax // 7530 | jne 0x32 // 837df803 | cmp dword ptr [ebp - 8], 3 // 752a | jne 0x2c // 03750c | add esi, dword ptr [ebp + 0xc] // fe45fe | inc byte ptr [ebp - 2] // 85c0 | test eax, eax condition: 7 of them and filesize < 829440 }
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