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rule win_portdoor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.portdoor." 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.portdoor" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 0fb64101 50 0fb601 50 8d45a8 68???????? 50 } // n = 7, score = 100 // 0fb64101 | movzx eax, byte ptr [ecx + 1] // 50 | push eax // 0fb601 | movzx eax, byte ptr [ecx] // 50 | push eax // 8d45a8 | lea eax, [ebp - 0x58] // 68???????? | // 50 | push eax $sequence_1 = { 53 56 57 33db 8d85fdfbffff } // n = 5, score = 100 // 53 | push ebx // 56 | push esi // 57 | push edi // 33db | xor ebx, ebx // 8d85fdfbffff | lea eax, [ebp - 0x403] $sequence_2 = { 68???????? ff35???????? 68???????? 8b4db4 e8???????? 8945b0 eb04 } // n = 7, score = 100 // 68???????? | // ff35???????? | // 68???????? | // 8b4db4 | mov ecx, dword ptr [ebp - 0x4c] // e8???????? | // 8945b0 | mov dword ptr [ebp - 0x50], eax // eb04 | jmp 6 $sequence_3 = { 80f90d 741a 80f920 7415 80f922 751f c645ff01 } // n = 7, score = 100 // 80f90d | cmp cl, 0xd // 741a | je 0x1c // 80f920 | cmp cl, 0x20 // 7415 | je 0x17 // 80f922 | cmp cl, 0x22 // 751f | jne 0x21 // c645ff01 | mov byte ptr [ebp - 1], 1 $sequence_4 = { a5 e8???????? 8bbdf0feffff 83c40c 85c0 } // n = 5, score = 100 // a5 | movsd dword ptr es:[edi], dword ptr [esi] // e8???????? | // 8bbdf0feffff | mov edi, dword ptr [ebp - 0x110] // 83c40c | add esp, 0xc // 85c0 | test eax, eax $sequence_5 = { 56 ff15???????? 8bf8 83ffff 7507 32c0 e9???????? } // n = 7, score = 100 // 56 | push esi // ff15???????? | // 8bf8 | mov edi, eax // 83ffff | cmp edi, -1 // 7507 | jne 9 // 32c0 | xor al, al // e9???????? | $sequence_6 = { 8d55fc 53 56 33db 57 895dfc } // n = 6, score = 100 // 8d55fc | lea edx, [ebp - 4] // 53 | push ebx // 56 | push esi // 33db | xor ebx, ebx // 57 | push edi // 895dfc | mov dword ptr [ebp - 4], ebx $sequence_7 = { 8945e0 8d8050f40110 8945e4 803800 8bc8 7435 8a4101 } // n = 7, score = 100 // 8945e0 | mov dword ptr [ebp - 0x20], eax // 8d8050f40110 | lea eax, [eax + 0x1001f450] // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 803800 | cmp byte ptr [eax], 0 // 8bc8 | mov ecx, eax // 7435 | je 0x37 // 8a4101 | mov al, byte ptr [ecx + 1] $sequence_8 = { ff35???????? e8???????? 6800001000 6a00 ff35???????? 8bf0 } // n = 6, score = 100 // ff35???????? | // e8???????? | // 6800001000 | push 0x100000 // 6a00 | push 0 // ff35???????? | // 8bf0 | mov esi, eax $sequence_9 = { 59 85c0 7810 3de4000000 7309 8b04c5189e0110 } // n = 6, score = 100 // 59 | pop ecx // 85c0 | test eax, eax // 7810 | js 0x12 // 3de4000000 | cmp eax, 0xe4 // 7309 | jae 0xb // 8b04c5189e0110 | mov eax, dword ptr [eax*8 + 0x10019e18] condition: 7 of them and filesize < 297984 }
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