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rule win_himera_loader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.himera_loader." 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.himera_loader" 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 = { 8b5508 52 e8???????? 83c404 b908000000 } // n = 5, score = 200 // 8b5508 | mov edx, dword ptr [ebp + 8] // 52 | push edx // e8???????? | // 83c404 | add esp, 4 // b908000000 | mov ecx, 8 $sequence_1 = { 8d85f081ffff 50 8d8d1482ffff 51 8d951082ffff 52 } // n = 6, score = 200 // 8d85f081ffff | lea eax, [ebp - 0x7e10] // 50 | push eax // 8d8d1482ffff | lea ecx, [ebp - 0x7dec] // 51 | push ecx // 8d951082ffff | lea edx, [ebp - 0x7df0] // 52 | push edx $sequence_2 = { e8???????? 33c0 88856282ffff 8d8d6282ffff e8???????? 8bc8 e8???????? } // n = 7, score = 200 // e8???????? | // 33c0 | xor eax, eax // 88856282ffff | mov byte ptr [ebp - 0x7d9e], al // 8d8d6282ffff | lea ecx, [ebp - 0x7d9e] // e8???????? | // 8bc8 | mov ecx, eax // e8???????? | $sequence_3 = { 8945f0 50 8d45f4 64a300000000 894ddc c745d80f000000 c645e06d } // n = 7, score = 200 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 50 | push eax // 8d45f4 | lea eax, [ebp - 0xc] // 64a300000000 | mov dword ptr fs:[0], eax // 894ddc | mov dword ptr [ebp - 0x24], ecx // c745d80f000000 | mov dword ptr [ebp - 0x28], 0xf // c645e06d | mov byte ptr [ebp - 0x20], 0x6d $sequence_4 = { 6bc212 8b4d08 0fb71401 52 e8???????? 83c408 } // n = 6, score = 200 // 6bc212 | imul eax, edx, 0x12 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 0fb71401 | movzx edx, word ptr [ecx + eax] // 52 | push edx // e8???????? | // 83c408 | add esp, 8 $sequence_5 = { 83c404 3d49514f1a 750e 8b45e8 50 8d4df0 } // n = 6, score = 200 // 83c404 | add esp, 4 // 3d49514f1a | cmp eax, 0x1a4f5149 // 750e | jne 0x10 // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // 50 | push eax // 8d4df0 | lea ecx, [ebp - 0x10] $sequence_6 = { c645dc4f c645dd42 c645de63 c645df4b c645e043 } // n = 5, score = 200 // c645dc4f | mov byte ptr [ebp - 0x24], 0x4f // c645dd42 | mov byte ptr [ebp - 0x23], 0x42 // c645de63 | mov byte ptr [ebp - 0x22], 0x63 // c645df4b | mov byte ptr [ebp - 0x21], 0x4b // c645e043 | mov byte ptr [ebp - 0x20], 0x43 $sequence_7 = { 8d8dc0feffff 51 8d8dccfeffff e8???????? 8985d0feffff 83bdd0feffff00 7505 } // n = 7, score = 200 // 8d8dc0feffff | lea ecx, [ebp - 0x140] // 51 | push ecx // 8d8dccfeffff | lea ecx, [ebp - 0x134] // e8???????? | // 8985d0feffff | mov dword ptr [ebp - 0x130], eax // 83bdd0feffff00 | cmp dword ptr [ebp - 0x130], 0 // 7505 | jne 7 $sequence_8 = { 83e801 0f85b1000000 8b4508 dd00 ebc2 c745e4483f4200 eb19 } // n = 7, score = 200 // 83e801 | sub eax, 1 // 0f85b1000000 | jne 0xb7 // 8b4508 | mov eax, dword ptr [ebp + 8] // dd00 | fld qword ptr [eax] // ebc2 | jmp 0xffffffc4 // c745e4483f4200 | mov dword ptr [ebp - 0x1c], 0x423f48 // eb19 | jmp 0x1b $sequence_9 = { e8???????? 83c408 8b4dfc 66894104 6a03 } // n = 5, score = 200 // e8???????? | // 83c408 | add esp, 8 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 66894104 | mov word ptr [ecx + 4], ax // 6a03 | push 3 condition: 7 of them and filesize < 385024 }
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