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rule win_ranbyus_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.ranbyus." 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.ranbyus" 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 = { 8bec 51 837d0c00 7513 68???????? ff7508 e8???????? } // n = 7, score = 1100 // 8bec | mov ebp, esp // 51 | push ecx // 837d0c00 | cmp dword ptr [ebp + 0xc], 0 // 7513 | jne 0x15 // 68???????? | // ff7508 | push dword ptr [ebp + 8] // e8???????? | $sequence_1 = { 59 85ff 743e 56 6a01 } // n = 5, score = 1100 // 59 | pop ecx // 85ff | test edi, edi // 743e | je 0x40 // 56 | push esi // 6a01 | push 1 $sequence_2 = { e8???????? 8b06 ff743804 e8???????? } // n = 4, score = 1100 // e8???????? | // 8b06 | mov eax, dword ptr [esi] // ff743804 | push dword ptr [eax + edi + 4] // e8???????? | $sequence_3 = { 750a ff7508 ff760c 6a04 ff16 } // n = 5, score = 1100 // 750a | jne 0xc // ff7508 | push dword ptr [ebp + 8] // ff760c | push dword ptr [esi + 0xc] // 6a04 | push 4 // ff16 | call dword ptr [esi] $sequence_4 = { c20400 53 55 6a0c } // n = 4, score = 1100 // c20400 | ret 4 // 53 | push ebx // 55 | push ebp // 6a0c | push 0xc $sequence_5 = { 8b4028 85c0 75f5 c3 33c0 c3 } // n = 6, score = 1100 // 8b4028 | mov eax, dword ptr [eax + 0x28] // 85c0 | test eax, eax // 75f5 | jne 0xfffffff7 // c3 | ret // 33c0 | xor eax, eax // c3 | ret $sequence_6 = { 56 68???????? 89460c e8???????? 83c414 33c0 5e } // n = 7, score = 1100 // 56 | push esi // 68???????? | // 89460c | mov dword ptr [esi + 0xc], eax // e8???????? | // 83c414 | add esp, 0x14 // 33c0 | xor eax, eax // 5e | pop esi $sequence_7 = { 57 33ff 85db 7504 } // n = 4, score = 1100 // 57 | push edi // 33ff | xor edi, edi // 85db | test ebx, ebx // 7504 | jne 6 $sequence_8 = { c3 8b4c2404 33c0 85c9 7501 c3 8b11 } // n = 7, score = 1100 // c3 | ret // 8b4c2404 | mov ecx, dword ptr [esp + 4] // 33c0 | xor eax, eax // 85c9 | test ecx, ecx // 7501 | jne 3 // c3 | ret // 8b11 | mov edx, dword ptr [ecx] $sequence_9 = { 8b442410 894604 8bc6 5e c21000 } // n = 5, score = 1100 // 8b442410 | mov eax, dword ptr [esp + 0x10] // 894604 | mov dword ptr [esi + 4], eax // 8bc6 | mov eax, esi // 5e | pop esi // c21000 | ret 0x10 condition: 7 of them and filesize < 638976 }
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