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rule win_slub_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.slub" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { ff7764 8d4774 50 6a01 e8???????? 83c418 89442430 } // n = 7, score = 100 // ff7764 | push dword ptr [edi + 0x64] // 8d4774 | lea eax, [edi + 0x74] // 50 | push eax // 6a01 | push 1 // e8???????? | // 83c418 | add esp, 0x18 // 89442430 | mov dword ptr [esp + 0x30], eax $sequence_1 = { ff770c ff33 e8???????? 83c408 8903 85c0 7538 } // n = 7, score = 100 // ff770c | push dword ptr [edi + 0xc] // ff33 | push dword ptr [ebx] // e8???????? | // 83c408 | add esp, 8 // 8903 | mov dword ptr [ebx], eax // 85c0 | test eax, eax // 7538 | jne 0x3a $sequence_2 = { 83c404 8d8da8f7ffff e8???????? 8d85a8f7ffff c745fc0e000000 50 c785a8f7ffff98488d00 } // n = 7, score = 100 // 83c404 | add esp, 4 // 8d8da8f7ffff | lea ecx, [ebp - 0x858] // e8???????? | // 8d85a8f7ffff | lea eax, [ebp - 0x858] // c745fc0e000000 | mov dword ptr [ebp - 4], 0xe // 50 | push eax // c785a8f7ffff98488d00 | mov dword ptr [ebp - 0x858], 0x8d4898 $sequence_3 = { 57 c744241000000000 c744242000000000 8b0e 743a 8b86f4000000 8d99b0090000 } // n = 7, score = 100 // 57 | push edi // c744241000000000 | mov dword ptr [esp + 0x10], 0 // c744242000000000 | mov dword ptr [esp + 0x20], 0 // 8b0e | mov ecx, dword ptr [esi] // 743a | je 0x3c // 8b86f4000000 | mov eax, dword ptr [esi + 0xf4] // 8d99b0090000 | lea ebx, [ecx + 0x9b0] $sequence_4 = { e8???????? 83c404 c645fc02 8d8588f9ffff 83bd9cf9ffff08 0f438588f9ffff 85c0 } // n = 7, score = 100 // e8???????? | // 83c404 | add esp, 4 // c645fc02 | mov byte ptr [ebp - 4], 2 // 8d8588f9ffff | lea eax, [ebp - 0x678] // 83bd9cf9ffff08 | cmp dword ptr [ebp - 0x664], 8 // 0f438588f9ffff | cmovae eax, dword ptr [ebp - 0x678] // 85c0 | test eax, eax $sequence_5 = { ff2485e0538900 c644240404 c644240805 eb24 c644240405 c644240805 eb18 } // n = 7, score = 100 // ff2485e0538900 | jmp dword ptr [eax*4 + 0x8953e0] // c644240404 | mov byte ptr [esp + 4], 4 // c644240805 | mov byte ptr [esp + 8], 5 // eb24 | jmp 0x26 // c644240405 | mov byte ptr [esp + 4], 5 // c644240805 | mov byte ptr [esp + 8], 5 // eb18 | jmp 0x1a $sequence_6 = { 5f 5e 5d 8b08 8b442410 898844040000 8bc3 } // n = 7, score = 100 // 5f | pop edi // 5e | pop esi // 5d | pop ebp // 8b08 | mov ecx, dword ptr [eax] // 8b442410 | mov eax, dword ptr [esp + 0x10] // 898844040000 | mov dword ptr [eax + 0x444], ecx // 8bc3 | mov eax, ebx $sequence_7 = { 85ff 7539 c746140f000000 837e1410 7204 8b06 eb02 } // n = 7, score = 100 // 85ff | test edi, edi // 7539 | jne 0x3b // c746140f000000 | mov dword ptr [esi + 0x14], 0xf // 837e1410 | cmp dword ptr [esi + 0x14], 0x10 // 7204 | jb 6 // 8b06 | mov eax, dword ptr [esi] // eb02 | jmp 4 $sequence_8 = { e9???????? 83bf7c0100000b 7540 80bf8602000000 7437 68???????? 68???????? } // n = 7, score = 100 // e9???????? | // 83bf7c0100000b | cmp dword ptr [edi + 0x17c], 0xb // 7540 | jne 0x42 // 80bf8602000000 | cmp byte ptr [edi + 0x286], 0 // 7437 | je 0x39 // 68???????? | // 68???????? | $sequence_9 = { ff15???????? 8be8 83c404 85ed 744a 8bfe 0f1f00 } // n = 7, score = 100 // ff15???????? | // 8be8 | mov ebp, eax // 83c404 | add esp, 4 // 85ed | test ebp, ebp // 744a | je 0x4c // 8bfe | mov edi, esi // 0f1f00 | nop dword ptr [eax] condition: 7 of them and filesize < 1785856 }
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