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rule win_spora_ransom_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 668945f0 58 ff7510 668945f2 ff750c } // n = 5, score = 200 // 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 = { 50 ff36 ff15???????? 85c0 7402 8b18 } // n = 6, score = 200 // 50 | push eax // ff36 | push dword ptr [esi] // ff15???????? | // 85c0 | test eax, eax // 7402 | je 4 // 8b18 | mov ebx, dword ptr [eax] $sequence_2 = { 8d45e0 50 ff15???????? 0fb745e0 50 0fb745e2 50 } // n = 7, score = 200 // 8d45e0 | lea eax, [ebp - 0x20] // 50 | push eax // ff15???????? | // 0fb745e0 | movzx eax, word ptr [ebp - 0x20] // 50 | push eax // 0fb745e2 | movzx eax, word ptr [ebp - 0x1e] // 50 | push eax $sequence_3 = { 33c0 668945f4 8d45f0 50 ff15???????? } // n = 5, score = 200 // 33c0 | xor eax, eax // 668945f4 | mov word ptr [ebp - 0xc], ax // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax // ff15???????? | $sequence_4 = { 57 ff15???????? 57 e8???????? 57 ff15???????? 83c620 } // n = 7, score = 200 // 57 | push edi // ff15???????? | // 57 | push edi // e8???????? | // 57 | push edi // ff15???????? | // 83c620 | add esi, 0x20 $sequence_5 = { ff36 ff15???????? 8d440010 50 } // n = 4, score = 200 // ff36 | push dword ptr [esi] // ff15???????? | // 8d440010 | lea eax, [eax + eax + 0x10] // 50 | push eax $sequence_6 = { 50 e8???????? eb33 837ef001 752d ff36 ff15???????? } // n = 7, score = 200 // 50 | push eax // e8???????? | // eb33 | jmp 0x35 // 837ef001 | cmp dword ptr [esi - 0x10], 1 // 752d | jne 0x2f // ff36 | push dword ptr [esi] // ff15???????? | $sequence_7 = { ff15???????? 8bf8 3bfe 7438 57 53 } // n = 6, score = 200 // ff15???????? | // 8bf8 | mov edi, eax // 3bfe | cmp edi, esi // 7438 | je 0x3a // 57 | push edi // 53 | push ebx $sequence_8 = { ff15???????? 57 6a40 ffd6 8b3d???????? 33f6 } // n = 6, score = 200 // ff15???????? | // 57 | push edi // 6a40 | push 0x40 // ffd6 | call esi // 8b3d???????? | // 33f6 | xor esi, esi $sequence_9 = { 8bf8 85ff 7416 ff36 57 } // n = 5, score = 200 // 8bf8 | mov edi, eax // 85ff | test edi, edi // 7416 | je 0x18 // ff36 | push dword ptr [esi] // 57 | push edi condition: 7 of them and filesize < 73728 }
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