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rule win_odinaff_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.odinaff." 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.odinaff" 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 = { 81ec80000000 8b4508 53 56 57 50 } // n = 6, score = 200 // 81ec80000000 | sub esp, 0x80 // 8b4508 | mov eax, dword ptr [ebp + 8] // 53 | push ebx // 56 | push esi // 57 | push edi // 50 | push eax $sequence_1 = { ff15???????? 03c0 50 6a08 ffd7 50 } // n = 6, score = 200 // ff15???????? | // 03c0 | add eax, eax // 50 | push eax // 6a08 | push 8 // ffd7 | call edi // 50 | push eax $sequence_2 = { 8be5 5d c3 8b45fc 6a00 8d55f8 } // n = 6, score = 200 // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret // 8b45fc | mov eax, dword ptr [ebp - 4] // 6a00 | push 0 // 8d55f8 | lea edx, [ebp - 8] $sequence_3 = { 53 68???????? 68???????? ff15???????? 83c410 85ff } // n = 6, score = 200 // 53 | push ebx // 68???????? | // 68???????? | // ff15???????? | // 83c410 | add esp, 0x10 // 85ff | test edi, edi $sequence_4 = { c745f800000000 85f6 750e ff15???????? 5f 33c0 } // n = 6, score = 200 // c745f800000000 | mov dword ptr [ebp - 8], 0 // 85f6 | test esi, esi // 750e | jne 0x10 // ff15???????? | // 5f | pop edi // 33c0 | xor eax, eax $sequence_5 = { 85f6 7411 8d55fc 52 } // n = 4, score = 200 // 85f6 | test esi, esi // 7411 | je 0x13 // 8d55fc | lea edx, [ebp - 4] // 52 | push edx $sequence_6 = { 743a 56 ff15???????? 85c0 } // n = 4, score = 200 // 743a | je 0x3c // 56 | push esi // ff15???????? | // 85c0 | test eax, eax $sequence_7 = { c745d801000000 ff15???????? 85c0 750c ff15???????? 33c0 } // n = 6, score = 200 // c745d801000000 | mov dword ptr [ebp - 0x28], 1 // ff15???????? | // 85c0 | test eax, eax // 750c | jne 0xe // ff15???????? | // 33c0 | xor eax, eax $sequence_8 = { 50 51 ff15???????? 8b55c8 52 ffd7 } // n = 6, score = 200 // 50 | push eax // 51 | push ecx // ff15???????? | // 8b55c8 | mov edx, dword ptr [ebp - 0x38] // 52 | push edx // ffd7 | call edi $sequence_9 = { ff15???????? 8b4d0c 6a00 6880000000 6a02 6a00 6a00 } // n = 7, score = 200 // ff15???????? | // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 6a00 | push 0 // 6880000000 | push 0x80 // 6a02 | push 2 // 6a00 | push 0 // 6a00 | push 0 condition: 7 of them and filesize < 73728 }
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