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rule win_jolob_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.jolob." 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.jolob" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 8b5f0c 8d75ec 897df8 e8???????? 8b7df8 8b5f10 } // n = 6, score = 300 // 8b5f0c | mov ebx, dword ptr [edi + 0xc] // 8d75ec | lea esi, [ebp - 0x14] // 897df8 | mov dword ptr [ebp - 8], edi // e8???????? | // 8b7df8 | mov edi, dword ptr [ebp - 8] // 8b5f10 | mov ebx, dword ptr [edi + 0x10] $sequence_1 = { ebc1 51 51 53 33c0 55 } // n = 6, score = 300 // ebc1 | jmp 0xffffffc3 // 51 | push ecx // 51 | push ecx // 53 | push ebx // 33c0 | xor eax, eax // 55 | push ebp $sequence_2 = { c68405fcfbffff00 75f5 ff7514 ff7510 ff7518 ff7510 e8???????? } // n = 7, score = 300 // c68405fcfbffff00 | mov byte ptr [ebp + eax - 0x404], 0 // 75f5 | jne 0xfffffff7 // ff7514 | push dword ptr [ebp + 0x14] // ff7510 | push dword ptr [ebp + 0x10] // ff7518 | push dword ptr [ebp + 0x18] // ff7510 | push dword ptr [ebp + 0x10] // e8???????? | $sequence_3 = { 56 57 ff750c 8bf3 ff7508 e8???????? } // n = 6, score = 300 // 56 | push esi // 57 | push edi // ff750c | push dword ptr [ebp + 0xc] // 8bf3 | mov esi, ebx // ff7508 | push dword ptr [ebp + 8] // e8???????? | $sequence_4 = { 50 8b4604 6aff ffb004080000 ff15???????? 33c0 eb03 } // n = 7, score = 300 // 50 | push eax // 8b4604 | mov eax, dword ptr [esi + 4] // 6aff | push -1 // ffb004080000 | push dword ptr [eax + 0x804] // ff15???????? | // 33c0 | xor eax, eax // eb03 | jmp 5 $sequence_5 = { 7707 8bf3 e8???????? 8b4318 03431c } // n = 5, score = 300 // 7707 | ja 9 // 8bf3 | mov esi, ebx // e8???????? | // 8b4318 | mov eax, dword ptr [ebx + 0x18] // 03431c | add eax, dword ptr [ebx + 0x1c] $sequence_6 = { 57 50 8945f4 ff15???????? 8d7e04 } // n = 5, score = 300 // 57 | push edi // 50 | push eax // 8945f4 | mov dword ptr [ebp - 0xc], eax // ff15???????? | // 8d7e04 | lea edi, [esi + 4] $sequence_7 = { 59 3bc3 740c 8d4808 894904 8909 8bf0 } // n = 7, score = 300 // 59 | pop ecx // 3bc3 | cmp eax, ebx // 740c | je 0xe // 8d4808 | lea ecx, [eax + 8] // 894904 | mov dword ptr [ecx + 4], ecx // 8909 | mov dword ptr [ecx], ecx // 8bf0 | mov esi, eax $sequence_8 = { 85c0 7416 8b490c 89480c eb0e 8b4908 } // n = 6, score = 300 // 85c0 | test eax, eax // 7416 | je 0x18 // 8b490c | mov ecx, dword ptr [ecx + 0xc] // 89480c | mov dword ptr [eax + 0xc], ecx // eb0e | jmp 0x10 // 8b4908 | mov ecx, dword ptr [ecx + 8] $sequence_9 = { e8???????? eb16 395c2410 7504 53 53 eb19 } // n = 7, score = 300 // e8???????? | // eb16 | jmp 0x18 // 395c2410 | cmp dword ptr [esp + 0x10], ebx // 7504 | jne 6 // 53 | push ebx // 53 | push ebx // eb19 | jmp 0x1b condition: 7 of them and filesize < 196608 }
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