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rule win_odinaff_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { b8???????? e8???????? 8b45f8 83c410 85c0 } // n = 5, score = 200 // b8???????? | // e8???????? | // 8b45f8 | mov eax, dword ptr [ebp - 8] // 83c410 | add esp, 0x10 // 85c0 | test eax, eax $sequence_1 = { 3d1f040000 7505 bf01000000 56 ff15???????? 8bc7 5f } // n = 7, score = 200 // 3d1f040000 | cmp eax, 0x41f // 7505 | jne 7 // bf01000000 | mov edi, 1 // 56 | push esi // ff15???????? | // 8bc7 | mov eax, edi // 5f | pop edi $sequence_2 = { 83c40c 6a00 6a00 57 52 } // n = 5, score = 200 // 83c40c | add esp, 0xc // 6a00 | push 0 // 6a00 | push 0 // 57 | push edi // 52 | push edx $sequence_3 = { 6a00 6a03 6816011200 53 ff15???????? 8bf8 83ffff } // n = 7, score = 200 // 6a00 | push 0 // 6a03 | push 3 // 6816011200 | push 0x120116 // 53 | push ebx // ff15???????? | // 8bf8 | mov edi, eax // 83ffff | cmp edi, -1 $sequence_4 = { 750e ff15???????? 8b4df4 33c0 668901 68???????? } // n = 6, score = 200 // 750e | jne 0x10 // ff15???????? | // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 33c0 | xor eax, eax // 668901 | mov word ptr [ecx], ax // 68???????? | $sequence_5 = { 750e ff15???????? 5f 33c0 5e 8be5 5d } // n = 7, score = 200 // 750e | jne 0x10 // ff15???????? | // 5f | pop edi // 33c0 | xor eax, eax // 5e | pop esi // 8be5 | mov esp, ebp // 5d | pop ebp $sequence_6 = { c3 8b45fc 6a00 8d55f8 52 50 } // n = 6, score = 200 // c3 | ret // 8b45fc | mov eax, dword ptr [ebp - 4] // 6a00 | push 0 // 8d55f8 | lea edx, [ebp - 8] // 52 | push edx // 50 | push eax $sequence_7 = { 6a1f 56 ff15???????? 8b4d10 8b550c 51 } // n = 6, score = 200 // 6a1f | push 0x1f // 56 | push esi // ff15???????? | // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 8b550c | mov edx, dword ptr [ebp + 0xc] // 51 | push ecx $sequence_8 = { 41 81e1ff000000 8a9138474000 0fb6c2 } // n = 4, score = 200 // 41 | inc ecx // 81e1ff000000 | and ecx, 0xff // 8a9138474000 | mov dl, byte ptr [ecx + 0x404738] // 0fb6c2 | movzx eax, dl $sequence_9 = { 8b45e8 5f 5e 85c0 7407 } // n = 5, score = 200 // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // 5f | pop edi // 5e | pop esi // 85c0 | test eax, eax // 7407 | je 9 condition: 7 of them and filesize < 73728 }
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