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rule win_slub_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.slub." 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.slub" 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 = { 50 e8???????? 6a01 6a00 c645fc08 8bcf 8b7710 } // n = 7, score = 100 // 50 | push eax // e8???????? | // 6a01 | push 1 // 6a00 | push 0 // c645fc08 | mov byte ptr [ebp - 4], 8 // 8bcf | mov ecx, edi // 8b7710 | mov esi, dword ptr [edi + 0x10] $sequence_1 = { c7402400000000 8b44241c 3d12030900 7511 c783f401000002000000 33c0 e9???????? } // n = 7, score = 100 // c7402400000000 | mov dword ptr [eax + 0x24], 0 // 8b44241c | mov eax, dword ptr [esp + 0x1c] // 3d12030900 | cmp eax, 0x90312 // 7511 | jne 0x13 // c783f401000002000000 | mov dword ptr [ebx + 0x1f4], 2 // 33c0 | xor eax, eax // e9???????? | $sequence_2 = { 57 8b7d08 8bf3 8a07 3a86f0528f00 7408 3a86f8528f00 } // n = 7, score = 100 // 57 | push edi // 8b7d08 | mov edi, dword ptr [ebp + 8] // 8bf3 | mov esi, ebx // 8a07 | mov al, byte ptr [edi] // 3a86f0528f00 | cmp al, byte ptr [esi + 0x8f52f0] // 7408 | je 0xa // 3a86f8528f00 | cmp al, byte ptr [esi + 0x8f52f8] $sequence_3 = { 0f43c2 8bd0 80fb30 7ddf 8b4648 5f 5e } // n = 7, score = 100 // 0f43c2 | cmovae eax, edx // 8bd0 | mov edx, eax // 80fb30 | cmp bl, 0x30 // 7ddf | jge 0xffffffe1 // 8b4648 | mov eax, dword ptr [esi + 0x48] // 5f | pop edi // 5e | pop esi $sequence_4 = { 52 50 e8???????? 8bcf 898580f8ffff 899584f8ffff } // n = 6, score = 100 // 52 | push edx // 50 | push eax // e8???????? | // 8bcf | mov ecx, edi // 898580f8ffff | mov dword ptr [ebp - 0x780], eax // 899584f8ffff | mov dword ptr [ebp - 0x77c], edx $sequence_5 = { 53 8b08 83c110 e8???????? 84c0 7427 8b45ec } // n = 7, score = 100 // 53 | push ebx // 8b08 | mov ecx, dword ptr [eax] // 83c110 | add ecx, 0x10 // e8???????? | // 84c0 | test al, al // 7427 | je 0x29 // 8b45ec | mov eax, dword ptr [ebp - 0x14] $sequence_6 = { eb0a 3c04 b916000000 0f44d9 83bfc005000000 753e 83fb0a } // n = 7, score = 100 // eb0a | jmp 0xc // 3c04 | cmp al, 4 // b916000000 | mov ecx, 0x16 // 0f44d9 | cmove ebx, ecx // 83bfc005000000 | cmp dword ptr [edi + 0x5c0], 0 // 753e | jne 0x40 // 83fb0a | cmp ebx, 0xa $sequence_7 = { 45 5c 8600 59 5c 8600 d15c8600 } // n = 7, score = 100 // 45 | inc ebp // 5c | pop esp // 8600 | xchg byte ptr [eax], al // 59 | pop ecx // 5c | pop esp // 8600 | xchg byte ptr [eax], al // d15c8600 | rcr dword ptr [esi + eax*4], 1 $sequence_8 = { 3945c8 7406 837dc400 740c c70702000000 c70100000000 8d4514 } // n = 7, score = 100 // 3945c8 | cmp dword ptr [ebp - 0x38], eax // 7406 | je 8 // 837dc400 | cmp dword ptr [ebp - 0x3c], 0 // 740c | je 0xe // c70702000000 | mov dword ptr [edi], 2 // c70100000000 | mov dword ptr [ecx], 0 // 8d4514 | lea eax, [ebp + 0x14] $sequence_9 = { 8bec 56 8b7508 8b4608 85c0 7410 fe8808bc9000 } // n = 7, score = 100 // 8bec | mov ebp, esp // 56 | push esi // 8b7508 | mov esi, dword ptr [ebp + 8] // 8b4608 | mov eax, dword ptr [esi + 8] // 85c0 | test eax, eax // 7410 | je 0x12 // fe8808bc9000 | dec byte ptr [eax + 0x90bc08] condition: 7 of them and filesize < 1785856 }
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