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rule win_joao_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.joao." 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.joao" malpedia_rule_date = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 6a00 6a00 68b0000000 b9???????? e8???????? } // n = 5, score = 400 // 6a00 | push 0 // 6a00 | push 0 // 68b0000000 | push 0xb0 // b9???????? | // e8???????? | $sequence_1 = { 833f10 720e 8b03 50 e8???????? 8b4510 } // n = 6, score = 400 // 833f10 | cmp dword ptr [edi], 0x10 // 720e | jb 0x10 // 8b03 | mov eax, dword ptr [ebx] // 50 | push eax // e8???????? | // 8b4510 | mov eax, dword ptr [ebp + 0x10] $sequence_2 = { 741c 8b0f 8908 8d4804 83c704 } // n = 5, score = 400 // 741c | je 0x1e // 8b0f | mov ecx, dword ptr [edi] // 8908 | mov dword ptr [eax], ecx // 8d4804 | lea ecx, [eax + 4] // 83c704 | add edi, 4 $sequence_3 = { 40 50 8d4ef0 51 53 e8???????? } // n = 6, score = 400 // 40 | inc eax // 50 | push eax // 8d4ef0 | lea ecx, [esi - 0x10] // 51 | push ecx // 53 | push ebx // e8???????? | $sequence_4 = { e8???????? 83c404 897e14 897e18 897e1c 8b4604 } // n = 6, score = 400 // e8???????? | // 83c404 | add esp, 4 // 897e14 | mov dword ptr [esi + 0x14], edi // 897e18 | mov dword ptr [esi + 0x18], edi // 897e1c | mov dword ptr [esi + 0x1c], edi // 8b4604 | mov eax, dword ptr [esi + 4] $sequence_5 = { c745d000000000 85c9 746f 8b4320 03c6 8945cc } // n = 6, score = 400 // c745d000000000 | mov dword ptr [ebp - 0x30], 0 // 85c9 | test ecx, ecx // 746f | je 0x71 // 8b4320 | mov eax, dword ptr [ebx + 0x20] // 03c6 | add eax, esi // 8945cc | mov dword ptr [ebp - 0x34], eax $sequence_6 = { 837de810 8b45d4 7303 8d45d4 52 51 50 } // n = 7, score = 400 // 837de810 | cmp dword ptr [ebp - 0x18], 0x10 // 8b45d4 | mov eax, dword ptr [ebp - 0x2c] // 7303 | jae 5 // 8d45d4 | lea eax, [ebp - 0x2c] // 52 | push edx // 51 | push ecx // 50 | push eax $sequence_7 = { 52 8d4dd0 e8???????? 83f8ff 740b 6aff 50 } // n = 7, score = 400 // 52 | push edx // 8d4dd0 | lea ecx, [ebp - 0x30] // e8???????? | // 83f8ff | cmp eax, -1 // 740b | je 0xd // 6aff | push -1 // 50 | push eax $sequence_8 = { 3bd1 7299 837de810 720c } // n = 4, score = 400 // 3bd1 | cmp edx, ecx // 7299 | jb 0xffffff9b // 837de810 | cmp dword ptr [ebp - 0x18], 0x10 // 720c | jb 0xe $sequence_9 = { 52 8bce c745f802000000 897dfc e8???????? } // n = 5, score = 400 // 52 | push edx // 8bce | mov ecx, esi // c745f802000000 | mov dword ptr [ebp - 8], 2 // 897dfc | mov dword ptr [ebp - 4], edi // e8???????? | condition: 7 of them and filesize < 2867200 }
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