Actor(s): Operation Sharpshooter
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rule win_rising_sun_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.rising_sun." 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.rising_sun" 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 = { c7451ceb6cdf53 c745207d99ebb9 c74524f0924af9 c7452858285d83 c7452cb17b929c c745307d0f2b0f } // n = 6, score = 100 // c7451ceb6cdf53 | xor edx, edx // c745207d99ebb9 | inc ecx // c74524f0924af9 | mov eax, 0x400 // c7452858285d83 | dec eax // c7452cb17b929c | mov ecx, ebx // c745307d0f2b0f | dec eax $sequence_1 = { e8???????? ebc9 488bcb 488bc3 488d15e7780100 48c1f805 83e11f } // n = 7, score = 100 // e8???????? | // ebc9 | mov dword ptr [esp + 0x58], 0x67b0abfd // 488bcb | dec eax // 488bc3 | mov esi, ecx // 488d15e7780100 | dec eax // 48c1f805 | mov eax, 0x66666666 // 83e11f | push es $sequence_2 = { 7512 c705????????0d000000 4532ed 44886c2440 4885f6 743f 488bfe } // n = 7, score = 100 // 7512 | inc esp // c705????????0d000000 | // 4532ed | mov dword ptr [esp + 0x4c], edi // 44886c2440 | dec eax // 4885f6 | test ecx, ecx // 743f | jne 0x497 // 488bfe | dec eax $sequence_3 = { c785b4000000e9f05082 c785b8000000e7fa6acb c785bc00000088e87280 c785c000000044604695 c785c4000000920fad47 c785c8000000093f9752 c785cc000000c6aca765 } // n = 7, score = 100 // c785b4000000e9f05082 | dec eax // c785b8000000e7fa6acb | inc ebx // c785bc00000088e87280 | dec ebp // c785c000000044604695 | lea ebp, [ebp + ecx*2] // c785c4000000920fad47 | dec eax // c785c8000000093f9752 | mov eax, dword ptr [ebp + 0x28] // c785cc000000c6aca765 | dec eax $sequence_4 = { 41b701 44897c244c 488b0d???????? 4885c9 754a 488d0da6900200 48833d????????08 } // n = 7, score = 100 // 41b701 | mov edx, 0x32 // 44897c244c | mov eax, 0x64 // 488b0d???????? | // 4885c9 | inc sp // 754a | mov dword ptr [esp + 0x30], ebp // 488d0da6900200 | inc ebp // 48833d????????08 | $sequence_5 = { 7412 48837c244808 720a 488b4c2430 } // n = 4, score = 100 // 7412 | dec eax // 48837c244808 | lea ecx, [edi + 8] // 720a | dec esp // 488b4c2430 | mov dword ptr [esp + 0x68], ebp $sequence_6 = { c785cc0100003fac63f5 c785d00100000f815702 c785d40100006b20a6d3 c785d8010000ff9108d0 c785dc010000e0acc4b5 c785e0010000272e7346 c785e4010000df0d063e } // n = 7, score = 100 // c785cc0100003fac63f5 | mov ecx, dword ptr [esp + 0x30] // c785d00100000f815702 | xor edx, edx // c785d40100006b20a6d3 | inc ecx // c785d8010000ff9108d0 | mov esi, esp // c785dc010000e0acc4b5 | jbe 0x15f6 // c785e0010000272e7346 | dec esp // c785e4010000df0d063e | lea ebp, [0x19536] $sequence_7 = { 488b7d18 488bcd e8???????? 498b4cf408 48ffc3 488904cf 488b7c2470 } // n = 7, score = 100 // 488b7d18 | mov dword ptr [ebp - 0x5c], 0xa78bc8c8 // 488bcd | mov dword ptr [ebp - 0x58], 0xa7babca6 // e8???????? | // 498b4cf408 | mov dword ptr [ebp - 0x69], 0x3d64695f // 48ffc3 | dec eax // 488904cf | mov dword ptr [ebp + 0x17], eax // 488b7c2470 | mov byte ptr [ebp - 0x65], 0 $sequence_8 = { 4533c9 4533c0 33d2 ff15???????? 488bc8 488905???????? 4885c0 } // n = 7, score = 100 // 4533c9 | mov al, byte ptr [ecx + ebx + 0x1c] // 4533c0 | inc edx // 33d2 | mov byte ptr [ecx + eax + 0x243d0], al // ff15???????? | // 488bc8 | inc edx // 488905???????? | // 4885c0 | jmp 0x557 $sequence_9 = { ff15???????? ba55000000 85db 7f05 baaa000000 488d8dc0060000 41b800040000 } // n = 7, score = 100 // ff15???????? | // ba55000000 | inc ecx // 85db | mov eax, 0x1028 // 7f05 | dec eax // baaa000000 | lea edx, [0x12cf1] // 488d8dc0060000 | dec eax // 41b800040000 | mov ecx, edi condition: 7 of them and filesize < 409600 }
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