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rule win_sunorcal_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.sunorcal." 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.sunorcal" 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 = { 6a03 e8???????? cc 55 8bec 83ec0c } // n = 6, score = 200 // 6a03 | push 3 // e8???????? | // cc | int3 // 55 | push ebp // 8bec | mov ebp, esp // 83ec0c | sub esp, 0xc $sequence_1 = { 5b c21000 8b442404 8b00 } // n = 4, score = 200 // 5b | pop ebx // c21000 | ret 0x10 // 8b442404 | mov eax, dword ptr [esp + 4] // 8b00 | mov eax, dword ptr [eax] $sequence_2 = { ff15???????? 68b7000000 ff15???????? 6a64 68???????? 6a67 } // n = 6, score = 200 // ff15???????? | // 68b7000000 | push 0xb7 // ff15???????? | // 6a64 | push 0x64 // 68???????? | // 6a67 | push 0x67 $sequence_3 = { ff15???????? 68b7000000 ff15???????? 6a64 } // n = 4, score = 200 // ff15???????? | // 68b7000000 | push 0xb7 // ff15???????? | // 6a64 | push 0x64 $sequence_4 = { ff15???????? 68b7000000 ff15???????? 6a64 68???????? } // n = 5, score = 200 // ff15???????? | // 68b7000000 | push 0xb7 // ff15???????? | // 6a64 | push 0x64 // 68???????? | $sequence_5 = { 50 6a00 ff15???????? 6800040000 e8???????? } // n = 5, score = 200 // 50 | push eax // 6a00 | push 0 // ff15???????? | // 6800040000 | push 0x400 // e8???????? | $sequence_6 = { c21000 8b442404 8b00 813863736de0 } // n = 4, score = 200 // c21000 | ret 0x10 // 8b442404 | mov eax, dword ptr [esp + 4] // 8b00 | mov eax, dword ptr [eax] // 813863736de0 | cmp dword ptr [eax], 0xe06d7363 $sequence_7 = { ff15???????? 33c0 c3 c3 55 8bec } // n = 6, score = 200 // ff15???????? | // 33c0 | xor eax, eax // c3 | ret // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp $sequence_8 = { c21000 8b442404 8b00 813863736de0 752a } // n = 5, score = 200 // c21000 | ret 0x10 // 8b442404 | mov eax, dword ptr [esp + 4] // 8b00 | mov eax, dword ptr [eax] // 813863736de0 | cmp dword ptr [eax], 0xe06d7363 // 752a | jne 0x2c $sequence_9 = { ff15???????? 6a03 e8???????? cc 55 8bec 83ec0c } // n = 7, score = 200 // ff15???????? | // 6a03 | push 3 // e8???????? | // cc | int3 // 55 | push ebp // 8bec | mov ebp, esp // 83ec0c | sub esp, 0xc condition: 7 of them and filesize < 172032 }
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