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rule win_parasite_http_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.parasite_http." 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.parasite_http" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 57 b900040000 e8???????? 8bf8 85ff 0f848a000000 56 } // n = 7, score = 100 // 57 | push edi // b900040000 | mov ecx, 0x400 // e8???????? | // 8bf8 | mov edi, eax // 85ff | test edi, edi // 0f848a000000 | je 0x90 // 56 | push esi $sequence_1 = { 50 33c0 895dfc 53 53 } // n = 5, score = 100 // 50 | push eax // 33c0 | xor eax, eax // 895dfc | mov dword ptr [ebp - 4], ebx // 53 | push ebx // 53 | push ebx $sequence_2 = { 884df2 8d4dbc 66895dbe 668955c0 66895dc4 668945ce 66c745ec5669 } // n = 7, score = 100 // 884df2 | mov byte ptr [ebp - 0xe], cl // 8d4dbc | lea ecx, [ebp - 0x44] // 66895dbe | mov word ptr [ebp - 0x42], bx // 668955c0 | mov word ptr [ebp - 0x40], dx // 66895dc4 | mov word ptr [ebp - 0x3c], bx // 668945ce | mov word ptr [ebp - 0x32], ax // 66c745ec5669 | mov word ptr [ebp - 0x14], 0x6956 $sequence_3 = { e8???????? 59 85db 7407 8bcb e8???????? 8b45f0 } // n = 7, score = 100 // e8???????? | // 59 | pop ecx // 85db | test ebx, ebx // 7407 | je 9 // 8bcb | mov ecx, ebx // e8???????? | // 8b45f0 | mov eax, dword ptr [ebp - 0x10] $sequence_4 = { 6a36 6689460a 58 6a34 6689460e 58 57 } // n = 7, score = 100 // 6a36 | push 0x36 // 6689460a | mov word ptr [esi + 0xa], ax // 58 | pop eax // 6a34 | push 0x34 // 6689460e | mov word ptr [esi + 0xe], ax // 58 | pop eax // 57 | push edi $sequence_5 = { e8???????? b9???????? 8bd8 e8???????? 33d2 8bcb } // n = 6, score = 100 // e8???????? | // b9???????? | // 8bd8 | mov ebx, eax // e8???????? | // 33d2 | xor edx, edx // 8bcb | mov ecx, ebx $sequence_6 = { 57 8bf9 b9???????? e8???????? b9???????? 8bf0 e8???????? } // n = 7, score = 100 // 57 | push edi // 8bf9 | mov edi, ecx // b9???????? | // e8???????? | // b9???????? | // 8bf0 | mov esi, eax // e8???????? | $sequence_7 = { 57 e8???????? 03c6 50 52 } // n = 5, score = 100 // 57 | push edi // e8???????? | // 03c6 | add eax, esi // 50 | push eax // 52 | push edx $sequence_8 = { 740f 8d4dfc 51 51 51 50 } // n = 6, score = 100 // 740f | je 0x11 // 8d4dfc | lea ecx, [ebp - 4] // 51 | push ecx // 51 | push ecx // 51 | push ecx // 50 | push eax $sequence_9 = { 53 ffd0 8bcf e8???????? 8bce e8???????? 8bcb } // n = 7, score = 100 // 53 | push ebx // ffd0 | call eax // 8bcf | mov ecx, edi // e8???????? | // 8bce | mov ecx, esi // e8???????? | // 8bcb | mov ecx, ebx condition: 7 of them and filesize < 147456 }
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