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rule win_himera_loader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" 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 = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { c645ae1e c645af0e c645b006 c645b179 c645b247 } // n = 5, score = 200 // c645ae1e | mov byte ptr [ebp - 0x52], 0x1e // c645af0e | mov byte ptr [ebp - 0x51], 0xe // c645b006 | mov byte ptr [ebp - 0x50], 6 // c645b179 | mov byte ptr [ebp - 0x4f], 0x79 // c645b247 | mov byte ptr [ebp - 0x4e], 0x47 $sequence_1 = { 8945d8 85c0 754a e8???????? 8904bd00a14200 85c0 7426 } // n = 7, score = 200 // 8945d8 | mov dword ptr [ebp - 0x28], eax // 85c0 | test eax, eax // 754a | jne 0x4c // e8???????? | // 8904bd00a14200 | mov dword ptr [edi*4 + 0x42a100], eax // 85c0 | test eax, eax // 7426 | je 0x28 $sequence_2 = { b801000000 6bc814 8b55f8 0fbe040a 85c0 7409 c745fc01000000 } // n = 7, score = 200 // b801000000 | mov eax, 1 // 6bc814 | imul ecx, eax, 0x14 // 8b55f8 | mov edx, dword ptr [ebp - 8] // 0fbe040a | movsx eax, byte ptr [edx + ecx] // 85c0 | test eax, eax // 7409 | je 0xb // c745fc01000000 | mov dword ptr [ebp - 4], 1 $sequence_3 = { 8b048d7c3c4200 89858cf8ffff 85c0 0f8498000000 83f801 0f84b5000000 8b8d2cfeffff } // n = 7, score = 200 // 8b048d7c3c4200 | mov eax, dword ptr [ecx*4 + 0x423c7c] // 89858cf8ffff | mov dword ptr [ebp - 0x774], eax // 85c0 | test eax, eax // 0f8498000000 | je 0x9e // 83f801 | cmp eax, 1 // 0f84b5000000 | je 0xbb // 8b8d2cfeffff | mov ecx, dword ptr [ebp - 0x1d4] $sequence_4 = { 895508 0fbe45ff 85c0 7505 8b45f8 eb16 0fb64dff } // n = 7, score = 200 // 895508 | mov dword ptr [ebp + 8], edx // 0fbe45ff | movsx eax, byte ptr [ebp - 1] // 85c0 | test eax, eax // 7505 | jne 7 // 8b45f8 | mov eax, dword ptr [ebp - 8] // eb16 | jmp 0x18 // 0fb64dff | movzx ecx, byte ptr [ebp - 1] $sequence_5 = { 51 ff952c82ffff 33d2 88955882ffff } // n = 4, score = 200 // 51 | push ecx // ff952c82ffff | call dword ptr [ebp - 0x7dd4] // 33d2 | xor edx, edx // 88955882ffff | mov byte ptr [ebp - 0x7da8], dl $sequence_6 = { 83e13f c1f806 6bc938 8b048500a14200 804c082820 8b75d8 b9000000c0 } // n = 7, score = 200 // 83e13f | and ecx, 0x3f // c1f806 | sar eax, 6 // 6bc938 | imul ecx, ecx, 0x38 // 8b048500a14200 | mov eax, dword ptr [eax*4 + 0x42a100] // 804c082820 | or byte ptr [eax + ecx + 0x28], 0x20 // 8b75d8 | mov esi, dword ptr [ebp - 0x28] // b9000000c0 | mov ecx, 0xc0000000 $sequence_7 = { 51 8d951082ffff 52 8d8d5982ffff e8???????? 50 8d857c82ffff } // n = 7, score = 200 // 51 | push ecx // 8d951082ffff | lea edx, [ebp - 0x7df0] // 52 | push edx // 8d8d5982ffff | lea ecx, [ebp - 0x7da7] // e8???????? | // 50 | push eax // 8d857c82ffff | lea eax, [ebp - 0x7d84] $sequence_8 = { 55 8bec 83ec18 c745f800000000 c745f4f2030000 8b45f8 3b45f4 } // n = 7, score = 200 // 55 | push ebp // 8bec | mov ebp, esp // 83ec18 | sub esp, 0x18 // c745f800000000 | mov dword ptr [ebp - 8], 0 // c745f4f2030000 | mov dword ptr [ebp - 0xc], 0x3f2 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 3b45f4 | cmp eax, dword ptr [ebp - 0xc] $sequence_9 = { ba02000000 6bc223 8b4d08 0fb71401 52 e8???????? } // n = 6, score = 200 // ba02000000 | mov edx, 2 // 6bc223 | imul eax, edx, 0x23 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 0fb71401 | movzx edx, word ptr [ecx + eax] // 52 | push edx // e8???????? | condition: 7 of them and filesize < 385024 }
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