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rule win_odinaff_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 0fb69238474000 321437 46 ff4dfc 8856ff 75a8 } // n = 6, score = 200 // 0fb69238474000 | movzx edx, byte ptr [edx + 0x404738] // 321437 | xor dl, byte ptr [edi + esi] // 46 | inc esi // ff4dfc | dec dword ptr [ebp - 4] // 8856ff | mov byte ptr [esi - 1], dl // 75a8 | jne 0xffffffaa $sequence_1 = { 56 6804010000 8bd8 ff15???????? 53 } // n = 5, score = 200 // 56 | push esi // 6804010000 | push 0x104 // 8bd8 | mov ebx, eax // ff15???????? | // 53 | push ebx $sequence_2 = { 6804020000 8d85f8fdffff 6a00 50 c785f4fdffff00000000 } // n = 5, score = 200 // 6804020000 | push 0x204 // 8d85f8fdffff | lea eax, [ebp - 0x208] // 6a00 | push 0 // 50 | push eax // c785f4fdffff00000000 | mov dword ptr [ebp - 0x20c], 0 $sequence_3 = { 56 57 8b3d???????? 6800080000 6a08 c745f000080000 } // n = 6, score = 200 // 56 | push esi // 57 | push edi // 8b3d???????? | // 6800080000 | push 0x800 // 6a08 | push 8 // c745f000080000 | mov dword ptr [ebp - 0x10], 0x800 $sequence_4 = { 50 ffd6 8945f4 8b45f0 } // n = 4, score = 200 // 50 | push eax // ffd6 | call esi // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8b45f0 | mov eax, dword ptr [ebp - 0x10] $sequence_5 = { 50 ff15???????? 8b4d0c 6a00 6880000000 6a02 } // n = 6, score = 200 // 50 | push eax // ff15???????? | // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 6a00 | push 0 // 6880000000 | push 0x80 // 6a02 | push 2 $sequence_6 = { ff15???????? 8d4e04 8bd8 51 } // n = 4, score = 200 // ff15???????? | // 8d4e04 | lea ecx, [esi + 4] // 8bd8 | mov ebx, eax // 51 | push ecx $sequence_7 = { 6800080000 03d7 52 56 ff15???????? } // n = 5, score = 200 // 6800080000 | push 0x800 // 03d7 | add edx, edi // 52 | push edx // 56 | push esi // ff15???????? | $sequence_8 = { 25ff000000 8a9838474000 889038474000 889938474000 0fb69038474000 0fb6db 03d3 } // n = 7, score = 200 // 25ff000000 | and eax, 0xff // 8a9838474000 | mov bl, byte ptr [eax + 0x404738] // 889038474000 | mov byte ptr [eax + 0x404738], dl // 889938474000 | mov byte ptr [ecx + 0x404738], bl // 0fb69038474000 | movzx edx, byte ptr [eax + 0x404738] // 0fb6db | movzx ebx, bl // 03d3 | add edx, ebx $sequence_9 = { e9???????? 8b4db0 8b55a8 6a00 6a00 } // n = 5, score = 200 // e9???????? | // 8b4db0 | mov ecx, dword ptr [ebp - 0x50] // 8b55a8 | mov edx, dword ptr [ebp - 0x58] // 6a00 | push 0 // 6a00 | push 0 condition: 7 of them and filesize < 73728 }
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