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rule win_skinnyboy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.skinnyboy." 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.skinnyboy" 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 = { 03cb 51 ff37 6a08 ff15???????? } // n = 5, score = 100 // 03cb | add ecx, ebx // 51 | push ecx // ff37 | push dword ptr [edi] // 6a08 | push 8 // ff15???????? | $sequence_1 = { ff30 8945f0 ff36 8975f4 } // n = 4, score = 100 // ff30 | push dword ptr [eax] // 8945f0 | mov dword ptr [ebp - 0x10], eax // ff36 | push dword ptr [esi] // 8975f4 | mov dword ptr [ebp - 0xc], esi $sequence_2 = { 7d0d 8a441918 888158050110 41 ebe8 8975e0 } // n = 6, score = 100 // 7d0d | jge 0xf // 8a441918 | mov al, byte ptr [ecx + ebx + 0x18] // 888158050110 | mov byte ptr [ecx + 0x10010558], al // 41 | inc ecx // ebe8 | jmp 0xffffffea // 8975e0 | mov dword ptr [ebp - 0x20], esi $sequence_3 = { ffd7 ffd3 6a00 6a00 } // n = 4, score = 100 // ffd7 | call edi // ffd3 | call ebx // 6a00 | push 0 // 6a00 | push 0 $sequence_4 = { e8???????? 8b44242c 8b742424 8b5c2428 89442438 } // n = 5, score = 100 // e8???????? | // 8b44242c | mov eax, dword ptr [esp + 0x2c] // 8b742424 | mov esi, dword ptr [esp + 0x24] // 8b5c2428 | mov ebx, dword ptr [esp + 0x28] // 89442438 | mov dword ptr [esp + 0x38], eax $sequence_5 = { 6a01 56 ff15???????? 8d4c2420 } // n = 4, score = 100 // 6a01 | push 1 // 56 | push esi // ff15???????? | // 8d4c2420 | lea ecx, [esp + 0x20] $sequence_6 = { ffb5e0feffff 6a08 ff15???????? 50 ff15???????? 8bf0 } // n = 6, score = 100 // ffb5e0feffff | push dword ptr [ebp - 0x120] // 6a08 | push 8 // ff15???????? | // 50 | push eax // ff15???????? | // 8bf0 | mov esi, eax $sequence_7 = { 833cfdd80b011000 7515 68a00f0000 56 ff15???????? 8934fdd80b0110 } // n = 6, score = 100 // 833cfdd80b011000 | cmp dword ptr [edi*8 + 0x10010bd8], 0 // 7515 | jne 0x17 // 68a00f0000 | push 0xfa0 // 56 | push esi // ff15???????? | // 8934fdd80b0110 | mov dword ptr [edi*8 + 0x10010bd8], esi $sequence_8 = { 5f 8908 8b4dfc 8bc6 33cd 5e e8???????? } // n = 7, score = 100 // 5f | pop edi // 8908 | mov dword ptr [eax], ecx // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 8bc6 | mov eax, esi // 33cd | xor ecx, ebp // 5e | pop esi // e8???????? | $sequence_9 = { 59 eb36 8b8530e5ffff 8b8d14e5ffff 8b048510110110 } // n = 5, score = 100 // 59 | pop ecx // eb36 | jmp 0x38 // 8b8530e5ffff | mov eax, dword ptr [ebp - 0x1ad0] // 8b8d14e5ffff | mov ecx, dword ptr [ebp - 0x1aec] // 8b048510110110 | mov eax, dword ptr [eax*4 + 0x10011110] condition: 7 of them and filesize < 176128 }
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