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rule win_joao_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 8d45d4 52 51 50 } // n = 4, score = 400 // 8d45d4 | lea eax, [ebp - 0x2c] // 52 | push edx // 51 | push ecx // 50 | push eax $sequence_1 = { 3bc7 741e 8b4dfc 51 8b4e08 8d5610 } // n = 6, score = 400 // 3bc7 | cmp eax, edi // 741e | je 0x20 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 51 | push ecx // 8b4e08 | mov ecx, dword ptr [esi + 8] // 8d5610 | lea edx, [esi + 0x10] $sequence_2 = { 6a00 8d4dec 51 6a00 52 ffd0 } // n = 6, score = 400 // 6a00 | push 0 // 8d4dec | lea ecx, [ebp - 0x14] // 51 | push ecx // 6a00 | push 0 // 52 | push edx // ffd0 | call eax $sequence_3 = { 41 51 6a00 56 894510 ffd0 } // n = 6, score = 400 // 41 | inc ecx // 51 | push ecx // 6a00 | push 0 // 56 | push esi // 894510 | mov dword ptr [ebp + 0x10], eax // ffd0 | call eax $sequence_4 = { 8845d4 c745fc01000000 84c0 0f84dc000000 8b16 } // n = 5, score = 400 // 8845d4 | mov byte ptr [ebp - 0x2c], al // c745fc01000000 | mov dword ptr [ebp - 4], 1 // 84c0 | test al, al // 0f84dc000000 | je 0xe2 // 8b16 | mov edx, dword ptr [esi] $sequence_5 = { 8d45d0 50 8bce 897dfc e8???????? 837de810 c745fcffffffff } // n = 7, score = 400 // 8d45d0 | lea eax, [ebp - 0x30] // 50 | push eax // 8bce | mov ecx, esi // 897dfc | mov dword ptr [ebp - 4], edi // e8???????? | // 837de810 | cmp dword ptr [ebp - 0x18], 0x10 // c745fcffffffff | mov dword ptr [ebp - 4], 0xffffffff $sequence_6 = { 8b4804 8b4c3138 c645ef01 4b } // n = 4, score = 400 // 8b4804 | mov ecx, dword ptr [eax + 4] // 8b4c3138 | mov ecx, dword ptr [ecx + esi + 0x38] // c645ef01 | mov byte ptr [ebp - 0x11], 1 // 4b | dec ebx $sequence_7 = { 83c40c 85c0 7514 8b45e4 3bc7 } // n = 5, score = 400 // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 7514 | jne 0x16 // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 3bc7 | cmp eax, edi $sequence_8 = { 894510 83c720 e9???????? 8b4df4 } // n = 4, score = 400 // 894510 | mov dword ptr [ebp + 0x10], eax // 83c720 | add edi, 0x20 // e9???????? | // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] $sequence_9 = { 897e18 897e1c 8b4604 3bc7 741e 8b4dfc } // n = 6, score = 400 // 897e18 | mov dword ptr [esi + 0x18], edi // 897e1c | mov dword ptr [esi + 0x1c], edi // 8b4604 | mov eax, dword ptr [esi + 4] // 3bc7 | cmp eax, edi // 741e | je 0x20 // 8b4dfc | mov ecx, dword ptr [ebp - 4] condition: 7 of them and filesize < 2867200 }
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