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rule win_rhysida_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.rhysida." 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.rhysida" 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 = { e8???????? 498d4c2430 e8???????? 498d4c2448 e8???????? 498d4c2460 e8???????? } // n = 7, score = 100 // e8???????? | // 498d4c2430 | mov ecx, eax // e8???????? | // 498d4c2448 | mov eax, dword ptr [ebp - 8] // e8???????? | // 498d4c2460 | imul eax, dword ptr [ebp + 0x28] // e8???????? | $sequence_1 = { c1f808 4189c1 4c8b45a0 488b45a0 488d50fc 8b02 8d4801 } // n = 7, score = 100 // c1f808 | je 0xa0c // 4189c1 | dec esp // 4c8b45a0 | mov edx, esp // 488b45a0 | mov eax, 0xfffffffd // 488d50fc | inc ebp // 8b02 | test ebx, ebx // 8d4801 | je 0xa0e $sequence_2 = { f30f10858c000000 8b9588000000 488d45e0 488d4dc8 48894c2438 488d4dcc 48894c2430 } // n = 7, score = 100 // f30f10858c000000 | dec eax // 8b9588000000 | cwde // 488d45e0 | movss xmm0, dword ptr [ebp + 0x1b0] // 488d4dc8 | movss dword ptr [ebp + eax*4 + 0xa0], xmm0 // 48894c2438 | jmp 0x277 // 488d4dcc | mov eax, dword ptr [ebp + 0xb8] // 48894c2430 | dec eax $sequence_3 = { 488d1591430500 488d0d02440500 e8???????? eb01 90 837db800 7e06 } // n = 7, score = 100 // 488d1591430500 | inc ecx // 488d0d02440500 | shr ebp, 0x18 // e8???????? | // eb01 | shr ecx, 0x10 // 90 | inc esi // 837db800 | xor edi, dword ptr [ebp + ebp*4] // 7e06 | movzx esi, cl $sequence_4 = { f30f59c2 f30f58c1 f30f114550 f30f108518010000 f30f598518010000 0f2e4550 7616 } // n = 7, score = 100 // f30f59c2 | movss dword ptr [eax], xmm0 // f30f58c1 | cvtsi2ss xmm0, dword ptr [ebp - 0x20] // f30f114550 | addss xmm0, dword ptr [ebp - 4] // f30f108518010000 | dec eax // f30f598518010000 | mov eax, dword ptr [ebp + 0x40] // 0f2e4550 | movss dword ptr [eax + 4], xmm0 // 7616 | dec eax $sequence_5 = { e8???????? 6683f801 740a b800000000 e9???????? 488b45e8 4883c002 } // n = 7, score = 100 // e8???????? | // 6683f801 | movd eax, mm0 // 740a | fld xword ptr [esp + 0x50] // b800000000 | dec eax // e9???????? | // 488b45e8 | shr eax, 0x20 // 4883c002 | test eax, eax $sequence_6 = { 4489c7 4963f1 48833b00 0f8473030000 4885ed 0f8451030000 4585c0 } // n = 7, score = 100 // 4489c7 | mov dword ptr [eax], edx // 4963f1 | mov edx, 0 // 48833b00 | dec eax // 0f8473030000 | lea eax, [0x564c8] // 4885ed | dec eax // 0f8451030000 | mov edx, eax // 4585c0 | dec eax $sequence_7 = { e8???????? 8b45ec 85c0 7519 488b4510 41b800000000 ba00000000 } // n = 7, score = 100 // e8???????? | // 8b45ec | mov eax, dword ptr [eax + 0x28] // 85c0 | add eax, 1 // 7519 | dec eax // 488b4510 | cwde // 41b800000000 | dec eax // ba00000000 | lea edx, [eax*8] $sequence_8 = { c1f802 89c2 89d0 01c0 01d0 89458c 8b458c } // n = 7, score = 100 // c1f802 | push ebp // 89c2 | inc ecx // 89d0 | push esp // 01c0 | push ebp // 01d0 | push edi // 89458c | push esi // 8b458c | push ebx $sequence_9 = { 7e12 4c8b6e10 4b8b4c3d00 48f7d1 4821e9 4c01f1 4921e9 } // n = 7, score = 100 // 7e12 | jne 0x30 // 4c8b6e10 | inc ecx // 4b8b4c3d00 | movzx ecx, byte ptr [edx + 7] // 48f7d1 | dec ecx // 4821e9 | add edx, 8 // 4c01f1 | add ecx, 1 // 4921e9 | inc ecx condition: 7 of them and filesize < 2369536 }
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