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rule win_flowershop_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 0f857d030000 e9???????? 8325????????00 8b15???????? 85d2 760b 8bca } // n = 7, score = 500 // 0f857d030000 | jne 0x383 // e9???????? | // 8325????????00 | // 8b15???????? | // 85d2 | test edx, edx // 760b | jbe 0xd // 8bca | mov ecx, edx $sequence_1 = { ff750c ff15???????? 8bf0 d1e6 0fb7c6 50 8d470a } // n = 7, score = 500 // ff750c | push dword ptr [ebp + 0xc] // ff15???????? | // 8bf0 | mov esi, eax // d1e6 | shl esi, 1 // 0fb7c6 | movzx eax, si // 50 | push eax // 8d470a | lea eax, [edi + 0xa] $sequence_2 = { 33f6 85c0 761e bb???????? 53 57 e8???????? } // n = 7, score = 500 // 33f6 | xor esi, esi // 85c0 | test eax, eax // 761e | jbe 0x20 // bb???????? | // 53 | push ebx // 57 | push edi // e8???????? | $sequence_3 = { 8b45f0 8b3d???????? 8db008010000 56 6a08 ffd7 50 } // n = 7, score = 500 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 8b3d???????? | // 8db008010000 | lea esi, [eax + 0x108] // 56 | push esi // 6a08 | push 8 // ffd7 | call edi // 50 | push eax $sequence_4 = { 33ff 80240100 217dfc 8d450c 50 8d4508 50 } // n = 7, score = 500 // 33ff | xor edi, edi // 80240100 | and byte ptr [ecx + eax], 0 // 217dfc | and dword ptr [ebp - 4], edi // 8d450c | lea eax, [ebp + 0xc] // 50 | push eax // 8d4508 | lea eax, [ebp + 8] // 50 | push eax $sequence_5 = { 85c0 740a 3b4514 7705 6a01 58 eb02 } // n = 7, score = 500 // 85c0 | test eax, eax // 740a | je 0xc // 3b4514 | cmp eax, dword ptr [ebp + 0x14] // 7705 | ja 7 // 6a01 | push 1 // 58 | pop eax // eb02 | jmp 4 $sequence_6 = { c3 895104 c3 56 8b742408 57 8b4604 } // n = 7, score = 500 // c3 | ret // 895104 | mov dword ptr [ecx + 4], edx // c3 | ret // 56 | push esi // 8b742408 | mov esi, dword ptr [esp + 8] // 57 | push edi // 8b4604 | mov eax, dword ptr [esi + 4] $sequence_7 = { e8???????? 33c0 eb7b 6a01 5e 837c241005 7c5e } // n = 7, score = 500 // e8???????? | // 33c0 | xor eax, eax // eb7b | jmp 0x7d // 6a01 | push 1 // 5e | pop esi // 837c241005 | cmp dword ptr [esp + 0x10], 5 // 7c5e | jl 0x60 $sequence_8 = { 33c0 5f 2bd1 c7450824000000 3b7d0c 7712 8b5c0afc } // n = 7, score = 500 // 33c0 | xor eax, eax // 5f | pop edi // 2bd1 | sub edx, ecx // c7450824000000 | mov dword ptr [ebp + 8], 0x24 // 3b7d0c | cmp edi, dword ptr [ebp + 0xc] // 7712 | ja 0x14 // 8b5c0afc | mov ebx, dword ptr [edx + ecx - 4] $sequence_9 = { 33f6 eb4b 8b7d08 3b7dfc 741c 8d45fc 50 } // n = 7, score = 500 // 33f6 | xor esi, esi // eb4b | jmp 0x4d // 8b7d08 | mov edi, dword ptr [ebp + 8] // 3b7dfc | cmp edi, dword ptr [ebp - 4] // 741c | je 0x1e // 8d45fc | lea eax, [ebp - 4] // 50 | push eax condition: 7 of them and filesize < 829440 }
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