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rule win_portdoor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { b001 5e 5b 5d c20800 32c0 } // n = 6, score = 100 // b001 | mov al, 1 // 5e | pop esi // 5b | pop ebx // 5d | pop ebp // c20800 | ret 8 // 32c0 | xor al, al $sequence_1 = { 899528e5ffff 53 8b1495b80f0210 898d24e5ffff 8a5c1124 02db d0fb } // n = 7, score = 100 // 899528e5ffff | mov dword ptr [ebp - 0x1ad8], edx // 53 | push ebx // 8b1495b80f0210 | mov edx, dword ptr [edx*4 + 0x10020fb8] // 898d24e5ffff | mov dword ptr [ebp - 0x1adc], ecx // 8a5c1124 | mov bl, byte ptr [ecx + edx + 0x24] // 02db | add bl, bl // d0fb | sar bl, 1 $sequence_2 = { 5f ffb520feffff 660f6f05???????? 8d8560ffffff ffb528feffff f30f7f45e0 } // n = 6, score = 100 // 5f | pop edi // ffb520feffff | push dword ptr [ebp - 0x1e0] // 660f6f05???????? | // 8d8560ffffff | lea eax, [ebp - 0xa0] // ffb528feffff | push dword ptr [ebp - 0x1d8] // f30f7f45e0 | movdqu xmmword ptr [ebp - 0x20], xmm0 $sequence_3 = { 8b7d08 33db 6a14 8945f4 5e 51 51 } // n = 7, score = 100 // 8b7d08 | mov edi, dword ptr [ebp + 8] // 33db | xor ebx, ebx // 6a14 | push 0x14 // 8945f4 | mov dword ptr [ebp - 0xc], eax // 5e | pop esi // 51 | push ecx // 51 | push ecx $sequence_4 = { 83c008 5d c3 8b04c5c4f80110 } // n = 4, score = 100 // 83c008 | add eax, 8 // 5d | pop ebp // c3 | ret // 8b04c5c4f80110 | mov eax, dword ptr [eax*8 + 0x1001f8c4] $sequence_5 = { 8d4672 50 8d4652 50 8d85fcfbffff 68???????? 50 } // n = 7, score = 100 // 8d4672 | lea eax, [esi + 0x72] // 50 | push eax // 8d4652 | lea eax, [esi + 0x52] // 50 | push eax // 8d85fcfbffff | lea eax, [ebp - 0x404] // 68???????? | // 50 | push eax $sequence_6 = { 53 50 8d85fcf3ffff 50 ff36 } // n = 5, score = 100 // 53 | push ebx // 50 | push eax // 8d85fcf3ffff | lea eax, [ebp - 0xc04] // 50 | push eax // ff36 | push dword ptr [esi] $sequence_7 = { 83f9ff 745a 57 33ff 8d45f8 } // n = 5, score = 100 // 83f9ff | cmp ecx, -1 // 745a | je 0x5c // 57 | push edi // 33ff | xor edi, edi // 8d45f8 | lea eax, [ebp - 8] $sequence_8 = { 33c5 8945fc 53 8b1d???????? 8bcb 56 } // n = 6, score = 100 // 33c5 | xor eax, ebp // 8945fc | mov dword ptr [ebp - 4], eax // 53 | push ebx // 8b1d???????? | // 8bcb | mov ecx, ebx // 56 | push esi $sequence_9 = { 8bce e8???????? eb11 807e4c00 7409 8bce e8???????? } // n = 7, score = 100 // 8bce | mov ecx, esi // e8???????? | // eb11 | jmp 0x13 // 807e4c00 | cmp byte ptr [esi + 0x4c], 0 // 7409 | je 0xb // 8bce | mov ecx, esi // e8???????? | condition: 7 of them and filesize < 297984 }
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