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rule win_flowershop_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 33c0 39450c 8945f8 8945fc 7640 53 56 } // n = 7, score = 500 // 33c0 | xor eax, eax // 39450c | cmp dword ptr [ebp + 0xc], eax // 8945f8 | mov dword ptr [ebp - 8], eax // 8945fc | mov dword ptr [ebp - 4], eax // 7640 | jbe 0x42 // 53 | push ebx // 56 | push esi $sequence_1 = { 8d0488 50 e8???????? 59 83f801 59 7474 } // n = 7, score = 500 // 8d0488 | lea eax, [eax + ecx*4] // 50 | push eax // e8???????? | // 59 | pop ecx // 83f801 | cmp eax, 1 // 59 | pop ecx // 7474 | je 0x76 $sequence_2 = { 83e800 59 7456 48 7522 8d85f8fdffff 6804010000 } // n = 7, score = 500 // 83e800 | sub eax, 0 // 59 | pop ecx // 7456 | je 0x58 // 48 | dec eax // 7522 | jne 0x24 // 8d85f8fdffff | lea eax, [ebp - 0x208] // 6804010000 | push 0x104 $sequence_3 = { 8d4590 50 6a01 e8???????? 83c438 3bc3 } // n = 6, score = 500 // 8d4590 | lea eax, [ebp - 0x70] // 50 | push eax // 6a01 | push 1 // e8???????? | // 83c438 | add esp, 0x38 // 3bc3 | cmp eax, ebx $sequence_4 = { 8d45f4 ff75fc 50 e8???????? 8b45fc 6a04 } // n = 6, score = 500 // 8d45f4 | lea eax, [ebp - 0xc] // ff75fc | push dword ptr [ebp - 4] // 50 | push eax // e8???????? | // 8b45fc | mov eax, dword ptr [ebp - 4] // 6a04 | push 4 $sequence_5 = { 894508 0fb606 8bc8 6a08 c1e903 99 8d7c0df8 } // n = 7, score = 500 // 894508 | mov dword ptr [ebp + 8], eax // 0fb606 | movzx eax, byte ptr [esi] // 8bc8 | mov ecx, eax // 6a08 | push 8 // c1e903 | shr ecx, 3 // 99 | cdq // 8d7c0df8 | lea edi, [ebp + ecx - 8] $sequence_6 = { 399ec8110000 7416 c7863812000001000000 56 e8???????? 59 e9???????? } // n = 7, score = 500 // 399ec8110000 | cmp dword ptr [esi + 0x11c8], ebx // 7416 | je 0x18 // c7863812000001000000 | mov dword ptr [esi + 0x1238], 1 // 56 | push esi // e8???????? | // 59 | pop ecx // e9???????? | $sequence_7 = { 57 bf???????? 03c7 50 53 ffd6 8945fc } // n = 7, score = 500 // 57 | push edi // bf???????? | // 03c7 | add eax, edi // 50 | push eax // 53 | push ebx // ffd6 | call esi // 8945fc | mov dword ptr [ebp - 4], eax $sequence_8 = { a3???????? 8b44240c a3???????? c3 8b442410 8b0d???????? 8908 } // n = 7, score = 500 // a3???????? | // 8b44240c | mov eax, dword ptr [esp + 0xc] // a3???????? | // c3 | ret // 8b442410 | mov eax, dword ptr [esp + 0x10] // 8b0d???????? | // 8908 | mov dword ptr [eax], ecx $sequence_9 = { 8b4510 8998c0110000 8b4510 051c120000 50 ff15???????? 53 } // n = 7, score = 500 // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 8998c0110000 | mov dword ptr [eax + 0x11c0], ebx // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 051c120000 | add eax, 0x121c // 50 | push eax // ff15???????? | // 53 | push ebx condition: 7 of them and filesize < 829440 }
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