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rule win_spora_ransom_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.spora_ransom." 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.spora_ransom" 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 = { 6a3a 8d4641 668945f0 58 ff7510 668945f2 ff750c } // n = 7, score = 200 // 6a3a | push 0x3a // 8d4641 | lea eax, [esi + 0x41] // 668945f0 | mov word ptr [ebp - 0x10], ax // 58 | pop eax // ff7510 | push dword ptr [ebp + 0x10] // 668945f2 | mov word ptr [ebp - 0xe], ax // ff750c | push dword ptr [ebp + 0xc] $sequence_1 = { f6c301 742c 6a3a 8d4641 668945f0 58 ff7510 } // n = 7, score = 200 // f6c301 | test bl, 1 // 742c | je 0x2e // 6a3a | push 0x3a // 8d4641 | lea eax, [esi + 0x41] // 668945f0 | mov word ptr [ebp - 0x10], ax // 58 | pop eax // ff7510 | push dword ptr [ebp + 0x10] $sequence_2 = { 897df4 85ff 747a 834d08ff } // n = 4, score = 200 // 897df4 | mov dword ptr [ebp - 0xc], edi // 85ff | test edi, edi // 747a | je 0x7c // 834d08ff | or dword ptr [ebp + 8], 0xffffffff $sequence_3 = { 834d08ff 8d45f8 50 57 8d4508 50 } // n = 6, score = 200 // 834d08ff | or dword ptr [ebp + 8], 0xffffffff // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // 57 | push edi // 8d4508 | lea eax, [ebp + 8] // 50 | push eax $sequence_4 = { 8d4641 668945f0 58 ff7510 668945f2 ff750c 33c0 } // n = 7, score = 200 // 8d4641 | lea eax, [esi + 0x41] // 668945f0 | mov word ptr [ebp - 0x10], ax // 58 | pop eax // ff7510 | push dword ptr [ebp + 0x10] // 668945f2 | mov word ptr [ebp - 0xe], ax // ff750c | push dword ptr [ebp + 0xc] // 33c0 | xor eax, eax $sequence_5 = { 33c0 668945f4 8d45f0 50 ff15???????? 50 8d45f0 } // n = 7, score = 200 // 33c0 | xor eax, eax // 668945f4 | mov word ptr [ebp - 0xc], ax // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax // ff15???????? | // 50 | push eax // 8d45f0 | lea eax, [ebp - 0x10] $sequence_6 = { 0fb600 48 50 ff36 ff15???????? 85c0 } // n = 6, score = 200 // 0fb600 | movzx eax, byte ptr [eax] // 48 | dec eax // 50 | push eax // ff36 | push dword ptr [esi] // ff15???????? | // 85c0 | test eax, eax $sequence_7 = { c745c800040000 33f6 8d45c4 50 ff15???????? 85c0 750e } // n = 7, score = 200 // c745c800040000 | mov dword ptr [ebp - 0x38], 0x400 // 33f6 | xor esi, esi // 8d45c4 | lea eax, [ebp - 0x3c] // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 750e | jne 0x10 $sequence_8 = { 50 ff15???????? 85c0 7466 56 57 bf00020000 } // n = 7, score = 200 // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 7466 | je 0x68 // 56 | push esi // 57 | push edi // bf00020000 | mov edi, 0x200 $sequence_9 = { 0bf0 57 ff15???????? 5f 8bc6 } // n = 5, score = 200 // 0bf0 | or esi, eax // 57 | push edi // ff15???????? | // 5f | pop edi // 8bc6 | mov eax, esi condition: 7 of them and filesize < 73728 }
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