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rule win_matanbuchus_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.matanbuchus." 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.matanbuchus" 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 = { 7507 33c0 e9???????? 8b4d08 034de4 894df4 8b55f4 } // n = 7, score = 400 // 7507 | jne 9 // 33c0 | xor eax, eax // e9???????? | // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 034de4 | add ecx, dword ptr [ebp - 0x1c] // 894df4 | mov dword ptr [ebp - 0xc], ecx // 8b55f4 | mov edx, dword ptr [ebp - 0xc] $sequence_1 = { 8b55f8 8b45e8 8b4dfc 030c90 894de4 8b5514 52 } // n = 7, score = 400 // 8b55f8 | mov edx, dword ptr [ebp - 8] // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 030c90 | add ecx, dword ptr [eax + edx*4] // 894de4 | mov dword ptr [ebp - 0x1c], ecx // 8b5514 | mov edx, dword ptr [ebp + 0x14] // 52 | push edx $sequence_2 = { c1e010 3345f8 8945f8 b901000000 c1e100 8b55ec 0fb6040a } // n = 7, score = 400 // c1e010 | shl eax, 0x10 // 3345f8 | xor eax, dword ptr [ebp - 8] // 8945f8 | mov dword ptr [ebp - 8], eax // b901000000 | mov ecx, 1 // c1e100 | shl ecx, 0 // 8b55ec | mov edx, dword ptr [ebp - 0x14] // 0fb6040a | movzx eax, byte ptr [edx + ecx] $sequence_3 = { 8945e8 837de801 743d 837de802 741f 837de803 } // n = 6, score = 400 // 8945e8 | mov dword ptr [ebp - 0x18], eax // 837de801 | cmp dword ptr [ebp - 0x18], 1 // 743d | je 0x3f // 837de802 | cmp dword ptr [ebp - 0x18], 2 // 741f | je 0x21 // 837de803 | cmp dword ptr [ebp - 0x18], 3 $sequence_4 = { 8b45ec 0fb60c10 334df8 894df8 6955f895e9d15b } // n = 5, score = 400 // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 0fb60c10 | movzx ecx, byte ptr [eax + edx] // 334df8 | xor ecx, dword ptr [ebp - 8] // 894df8 | mov dword ptr [ebp - 8], ecx // 6955f895e9d15b | imul edx, dword ptr [ebp - 8], 0x5bd1e995 $sequence_5 = { 894dfc eb2d ba01000000 6bc200 } // n = 4, score = 400 // 894dfc | mov dword ptr [ebp - 4], ecx // eb2d | jmp 0x2f // ba01000000 | mov edx, 1 // 6bc200 | imul eax, edx, 0 $sequence_6 = { 8955fc 8b45fc 3345f8 8945fc 694df095e9d15b } // n = 5, score = 400 // 8955fc | mov dword ptr [ebp - 4], edx // 8b45fc | mov eax, dword ptr [ebp - 4] // 3345f8 | xor eax, dword ptr [ebp - 8] // 8945fc | mov dword ptr [ebp - 4], eax // 694df095e9d15b | imul ecx, dword ptr [ebp - 0x10], 0x5bd1e995 $sequence_7 = { 8945d0 0fb74df4 0fb755f8 8b45f0 035010 3bca 7417 } // n = 7, score = 400 // 8945d0 | mov dword ptr [ebp - 0x30], eax // 0fb74df4 | movzx ecx, word ptr [ebp - 0xc] // 0fb755f8 | movzx edx, word ptr [ebp - 8] // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 035010 | add edx, dword ptr [eax + 0x10] // 3bca | cmp ecx, edx // 7417 | je 0x19 $sequence_8 = { 8b4d08 894dec 8b5510 8955fc 837d0c04 } // n = 5, score = 400 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 894dec | mov dword ptr [ebp - 0x14], ecx // 8b5510 | mov edx, dword ptr [ebp + 0x10] // 8955fc | mov dword ptr [ebp - 4], edx // 837d0c04 | cmp dword ptr [ebp + 0xc], 4 $sequence_9 = { e8???????? 8bc8 8b4514 8b5518 e8???????? } // n = 5, score = 400 // e8???????? | // 8bc8 | mov ecx, eax // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 8b5518 | mov edx, dword ptr [ebp + 0x18] // e8???????? | condition: 7 of them and filesize < 2056192 }
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