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rule win_gophe_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.gophe." 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.gophe" 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 = { 833902 0f94c0 84c0 7407 } // n = 4, score = 300 // 833902 | cmp dword ptr [ecx], 2 // 0f94c0 | sete al // 84c0 | test al, al // 7407 | je 9 $sequence_1 = { 84c0 7407 e8???????? eb06 e8???????? 90 } // n = 6, score = 200 // 84c0 | test al, al // 7407 | je 9 // e8???????? | // eb06 | jmp 8 // e8???????? | // 90 | nop $sequence_2 = { 57 ff15???????? 32c0 8b4df4 } // n = 4, score = 200 // 57 | mov dword ptr [esi], 0xffffffff // ff15???????? | // 32c0 | push 0x105 // 8b4df4 | lea eax, [ebp - 0x220] $sequence_3 = { 8bc3 c1e810 440fb6c8 8bc3 } // n = 4, score = 200 // 8bc3 | inc ecx // c1e810 | mov eax, 0x230 // 440fb6c8 | dec eax // 8bc3 | mov ecx, ebx $sequence_4 = { 7416 6830020000 6a00 56 } // n = 4, score = 200 // 7416 | push ecx // 6830020000 | push eax // 6a00 | push edi // 56 | call esi $sequence_5 = { 7416 33d2 41b830020000 488bcb e8???????? } // n = 5, score = 200 // 7416 | je 0x18 // 33d2 | xor edx, edx // 41b830020000 | inc ecx // 488bcb | mov eax, 0x230 // e8???????? | $sequence_6 = { 7408 488b0f e8???????? 488b07 c74708ffffffff 8b5014 4885f6 } // n = 7, score = 200 // 7408 | mov dword ptr [ebx], 0xffffffff // 488b0f | mov eax, 0x500 // e8???????? | // 488b07 | mov eax, ebx // c74708ffffffff | shr eax, 0x10 // 8b5014 | inc esp // 4885f6 | movzx ecx, al $sequence_7 = { 75f9 2bc2 897e08 89460c } // n = 4, score = 200 // 75f9 | push eax // 2bc2 | call esi // 897e08 | push 0x105 // 89460c | lea eax, [ebp - 0x220] $sequence_8 = { 85c9 0f94c0 89431c 85c9 } // n = 4, score = 200 // 85c9 | test esi, esi // 0f94c0 | mov edi, eax // 89431c | test eax, eax // 85c9 | js 0x1a $sequence_9 = { 7417 4c8bc8 ba11010000 41b801000000 } // n = 4, score = 200 // 7417 | dec eax // 4c8bc8 | mov ecx, dword ptr [esp + 0x40] // ba11010000 | mov edi, eax // 41b801000000 | test eax, eax $sequence_10 = { 8bf8 85c0 7818 488b4c2440 } // n = 4, score = 200 // 8bf8 | mov eax, ebx // 85c0 | je 0xa // 7818 | dec eax // 488b4c2440 | mov ecx, dword ptr [edi] $sequence_11 = { 6805010000 8d85e0fdffff 50 68???????? } // n = 4, score = 200 // 6805010000 | mov eax, 3 // 8d85e0fdffff | pop ebp // 50 | push edx // 68???????? | $sequence_12 = { 56 e8???????? 83c40c c706ffffffff } // n = 4, score = 200 // 56 | mov ecx, eax // e8???????? | // 83c40c | mov edx, 0x111 // c706ffffffff | inc ecx $sequence_13 = { 7509 b803000000 5d c20400 6683383c } // n = 5, score = 200 // 7509 | dec eax // b803000000 | mov ecx, dword ptr [esp + 0x40] // 5d | push ebp // c20400 | mov ebp, esp // 6683383c | mov eax, dword ptr [ebp + 8] $sequence_14 = { 55 8bec 8b4508 85c0 7507 b802000000 5d } // n = 7, score = 200 // 55 | mov eax, dword ptr [ecx] // 8bec | test ecx, ecx // 8b4508 | sete al // 85c0 | mov dword ptr [ebx + 0x1c], eax // 7507 | test ecx, ecx // b802000000 | je 0x19 // 5d | dec esp $sequence_15 = { 52 51 50 57 ffd6 } // n = 5, score = 200 // 52 | cmp word ptr [eax], 0x3c // 51 | jb 0xfffffffb // 50 | mov ecx, 0x16 // 57 | push ebp // ffd6 | mov ebp, esp condition: 7 of them and filesize < 1582080 }
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