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rule win_parasite_http_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "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 = { ebea 55 8bec 83ec0c ba0b010000 53 56 } // n = 7, score = 100 // ebea | jmp 0xffffffec // 55 | push ebp // 8bec | mov ebp, esp // 83ec0c | sub esp, 0xc // ba0b010000 | mov edx, 0x10b // 53 | push ebx // 56 | push esi $sequence_1 = { 59 8b4dfc e8???????? 8b4df8 e8???????? } // n = 5, score = 100 // 59 | pop ecx // 8b4dfc | mov ecx, dword ptr [ebp - 4] // e8???????? | // 8b4df8 | mov ecx, dword ptr [ebp - 8] // e8???????? | $sequence_2 = { 0f843f020000 833d????????00 0f8430010000 50 33c0 0f9bc0 52 } // n = 7, score = 100 // 0f843f020000 | je 0x245 // 833d????????00 | // 0f8430010000 | je 0x136 // 50 | push eax // 33c0 | xor eax, eax // 0f9bc0 | setnp al // 52 | push edx $sequence_3 = { 59 03c0 50 8d85f0fbffff 50 53 e8???????? } // n = 7, score = 100 // 59 | pop ecx // 03c0 | add eax, eax // 50 | push eax // 8d85f0fbffff | lea eax, [ebp - 0x410] // 50 | push eax // 53 | push ebx // e8???????? | $sequence_4 = { 41 8a840d00ffffff 30043e 46 3b750c 7291 } // n = 6, score = 100 // 41 | inc ecx // 8a840d00ffffff | mov al, byte ptr [ebp + ecx - 0x100] // 30043e | xor byte ptr [esi + edi], al // 46 | inc esi // 3b750c | cmp esi, dword ptr [ebp + 0xc] // 7291 | jb 0xffffff93 $sequence_5 = { 7405 e8???????? 8b4de8 5f 85c9 7405 e8???????? } // n = 7, score = 100 // 7405 | je 7 // e8???????? | // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] // 5f | pop edi // 85c9 | test ecx, ecx // 7405 | je 7 // e8???????? | $sequence_6 = { d1e0 8bd0 8b4dfc e8???????? 59 } // n = 5, score = 100 // d1e0 | shl eax, 1 // 8bd0 | mov edx, eax // 8b4dfc | mov ecx, dword ptr [ebp - 4] // e8???????? | // 59 | pop ecx $sequence_7 = { e8???????? 85c0 743e 6a00 6a00 33d2 } // n = 6, score = 100 // e8???????? | // 85c0 | test eax, eax // 743e | je 0x40 // 6a00 | push 0 // 6a00 | push 0 // 33d2 | xor edx, edx $sequence_8 = { 0fb7c8 5f 0fb7c6 5e 2bc1 5b c3 } // n = 7, score = 100 // 0fb7c8 | movzx ecx, ax // 5f | pop edi // 0fb7c6 | movzx eax, si // 5e | pop esi // 2bc1 | sub eax, ecx // 5b | pop ebx // c3 | ret $sequence_9 = { e8???????? 8bc8 e8???????? 33c9 a3???????? 85c0 0f95c1 } // n = 7, score = 100 // e8???????? | // 8bc8 | mov ecx, eax // e8???????? | // 33c9 | xor ecx, ecx // a3???????? | // 85c0 | test eax, eax // 0f95c1 | setne cl condition: 7 of them and filesize < 147456 }
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