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rule win_mykings_spreader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.mykings_spreader." 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.mykings_spreader" 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 = { c785ecfdffff00000000 8d85e0fdffff e8???????? c785e0fdffff00000000 8b45f8 83c01b 8d95e0fdffff } // n = 7, score = 100 // c785ecfdffff00000000 | mov dword ptr [ebp - 0x214], 0 // 8d85e0fdffff | lea eax, [ebp - 0x220] // e8???????? | // c785e0fdffff00000000 | mov dword ptr [ebp - 0x220], 0 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 83c01b | add eax, 0x1b // 8d95e0fdffff | lea edx, [ebp - 0x220] $sequence_1 = { 85d2 7505 ba???????? 8b45f8 8b00 85c0 7505 } // n = 7, score = 100 // 85d2 | test edx, edx // 7505 | jne 7 // ba???????? | // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8b00 | mov eax, dword ptr [eax] // 85c0 | test eax, eax // 7505 | jne 7 $sequence_2 = { 89da 8b0424 e8???????? 85c0 7506 89742408 eb07 } // n = 7, score = 100 // 89da | mov edx, ebx // 8b0424 | mov eax, dword ptr [esp] // e8???????? | // 85c0 | test eax, eax // 7506 | jne 8 // 89742408 | mov dword ptr [esp + 8], esi // eb07 | jmp 9 $sequence_3 = { 89d0 8b12 ff5278 e9???????? 8d4da4 } // n = 5, score = 100 // 89d0 | mov eax, edx // 8b12 | mov edx, dword ptr [edx] // ff5278 | call dword ptr [edx + 0x78] // e9???????? | // 8d4da4 | lea ecx, [ebp - 0x5c] $sequence_4 = { e9???????? 8b5604 01da 8b02 89442414 8b4204 89442410 } // n = 7, score = 100 // e9???????? | // 8b5604 | mov edx, dword ptr [esi + 4] // 01da | add edx, ebx // 8b02 | mov eax, dword ptr [edx] // 89442414 | mov dword ptr [esp + 0x14], eax // 8b4204 | mov eax, dword ptr [edx + 4] // 89442410 | mov dword ptr [esp + 0x10], eax $sequence_5 = { 81e6f0ff0000 39d0 7548 ff4f10 89f2 c1ea04 8b4c9008 } // n = 7, score = 100 // 81e6f0ff0000 | and esi, 0xfff0 // 39d0 | cmp eax, edx // 7548 | jne 0x4a // ff4f10 | dec dword ptr [edi + 0x10] // 89f2 | mov edx, esi // c1ea04 | shr edx, 4 // 8b4c9008 | mov ecx, dword ptr [eax + edx*4 + 8] $sequence_6 = { 7577 8d4c2418 689b000000 51 ff15???????? 85c0 755d } // n = 7, score = 100 // 7577 | jne 0x79 // 8d4c2418 | lea ecx, [esp + 0x18] // 689b000000 | push 0x9b // 51 | push ecx // ff15???????? | // 85c0 | test eax, eax // 755d | jne 0x5f $sequence_7 = { a1???????? 85c0 740b ff35???????? e8???????? ba???????? b8???????? } // n = 7, score = 100 // a1???????? | // 85c0 | test eax, eax // 740b | je 0xd // ff35???????? | // e8???????? | // ba???????? | // b8???????? | $sequence_8 = { 51 33ff e8???????? 8bd0 83c408 85d2 7452 } // n = 7, score = 100 // 51 | push ecx // 33ff | xor edi, edi // e8???????? | // 8bd0 | mov edx, eax // 83c408 | add esp, 8 // 85d2 | test edx, edx // 7452 | je 0x54 $sequence_9 = { 90 7400 e9???????? 90 50 53 5b } // n = 7, score = 100 // 90 | nop // 7400 | je 2 // e9???????? | // 90 | nop // 50 | push eax // 53 | push ebx // 5b | pop ebx condition: 7 of them and filesize < 1581056 }
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