Actor(s): Operation Sharpshooter
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rule win_rising_sun_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 83c704 4863ce 8b9c0510010000 4863c7 48c1e109 488d940510010000 448bc3 } // n = 7, score = 100 // 83c704 | mov ecx, esi // 4863ce | test eax, eax // 8b9c0510010000 | je 0x1807 // 4863c7 | dec eax // 48c1e109 | mov ecx, dword ptr [ebx + 0x10] // 488d940510010000 | dec eax // 448bc3 | dec ecx $sequence_1 = { 488b4c2430 e8???????? 488b0d???????? 4885c9 7406 ff15???????? } // n = 6, score = 100 // 488b4c2430 | mov dword ptr [ebp - 0x80], 0xc8c8c8c8 // e8???????? | // 488b0d???????? | // 4885c9 | mov dword ptr [ebp - 0x7c], 0xa9beaca9 // 7406 | mov dword ptr [esp + 0x74], 0x9d7828c0 // ff15???????? | $sequence_2 = { 4881ecd00b0000 488b05???????? 4833c4 488985c00a0000 33f6 488bd9 488d8d72010000 } // n = 7, score = 100 // 4881ecd00b0000 | lea ebp, [esp - 0x1c10] // 488b05???????? | // 4833c4 | mov eax, 0x1d10 // 488985c00a0000 | dec eax // 33f6 | sub esp, eax // 488bd9 | movaps xmmword ptr [esp + 0x1d00], xmm6 // 488d8d72010000 | push ebp $sequence_3 = { 85c0 0f84fc010000 0f1f440000 498bcd 0fb7440d8c 4883c102 6689840d5e060000 } // n = 7, score = 100 // 85c0 | xor eax, eax // 0f84fc010000 | cmp cl, 0xa // 0f1f440000 | sete al // 498bcd | mov dword ptr [esp + 0x4c], eax // 0fb7440d8c | dec eax // 4883c102 | lea eax, [0x1766a] // 6689840d5e060000 | jne 0x467 $sequence_4 = { c7454c04349aa4 c745500d148684 c7455418f4cb64 c7455802d4f444 c7455c88b43a24 c7456097940f04 c74564ea7469e4 } // n = 7, score = 100 // c7454c04349aa4 | lea eax, [ecx + 1] // c745500d148684 | xor edx, edx // c7455418f4cb64 | dec eax // c7455802d4f444 | mov dword ptr [esp + 0x20], eax // c7455c88b43a24 | inc ebp // c7456097940f04 | xor ecx, ecx // c74564ea7469e4 | dec esp $sequence_5 = { 4533c0 33d2 498bce ff15???????? 85c0 7552 } // n = 6, score = 100 // 4533c0 | mov ecx, ebx // 33d2 | dec esp // 498bce | arpl ax, bx // ff15???????? | // 85c0 | jns 0x45b // 7552 | or eax, 0xffffffff $sequence_6 = { ff15???????? 8d530f 85c0 755c 488dbdc01b0000 4c8bc2 } // n = 6, score = 100 // ff15???????? | // 8d530f | dec eax // 85c0 | lea edx, [0x14a8c] // 755c | dec eax // 488dbdc01b0000 | lea ecx, [ebp + 0x2230] // 4c8bc2 | inc ebp $sequence_7 = { 66f3a7 75bf 488d4c2430 e8???????? 488d4c2430 } // n = 5, score = 100 // 66f3a7 | add dword ptr [esi], 4 // 75bf | cmp edi, 0x13 // 488d4c2430 | je 0x416 // e8???????? | // 488d4c2430 | cmp edi, 0xa $sequence_8 = { 4883ec20 33c0 48c7411807000000 488d15a97d0200 48894110 4983c9ff 4533c0 } // n = 7, score = 100 // 4883ec20 | je 0x3f0 // 33c0 | dec eax // 48c7411807000000 | inc ebx // 488d15a97d0200 | dec eax // 48894110 | cmp ebx, ebp // 4983c9ff | jae 0x3f8 // 4533c0 | inc cx $sequence_9 = { 4803c0 83ff0a 48896cc108 0f446c2470 8bc5 eb02 } // n = 6, score = 100 // 4803c0 | dec eax // 83ff0a | mov ecx, esi // 48896cc108 | dec ecx // 0f446c2470 | mov ecx, esp // 8bc5 | cmp eax, 0x3d // eb02 | jne 0x4cc condition: 7 of them and filesize < 409600 }
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