Actor(s): Poseidon Group
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rule win_makadocs_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.makadocs." 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.makadocs" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 7d02 33db 81fbfeffff7f 8b54240c 8b0a 8b41f4 7f6f } // n = 7, score = 100 // 7d02 | jge 4 // 33db | xor ebx, ebx // 81fbfeffff7f | cmp ebx, 0x7ffffffe // 8b54240c | mov edx, dword ptr [esp + 0xc] // 8b0a | mov ecx, dword ptr [edx] // 8b41f4 | mov eax, dword ptr [ecx - 0xc] // 7f6f | jg 0x71 $sequence_1 = { 56 53 6a00 6a03 83cfff ff15???????? } // n = 6, score = 100 // 56 | push esi // 53 | push ebx // 6a00 | push 0 // 6a03 | push 3 // 83cfff | or edi, 0xffffffff // ff15???????? | $sequence_2 = { 8dbd54ffffff e8???????? 83c404 8d9d44ffffff c645fc18 e8???????? c645fc17 } // n = 7, score = 100 // 8dbd54ffffff | lea edi, dword ptr [ebp - 0xac] // e8???????? | // 83c404 | add esp, 4 // 8d9d44ffffff | lea ebx, dword ptr [ebp - 0xbc] // c645fc18 | mov byte ptr [ebp - 4], 0x18 // e8???????? | // c645fc17 | mov byte ptr [ebp - 4], 0x17 $sequence_3 = { 50 8b4204 ffd0 c644242400 8b442430 83c0f0 8d480c } // n = 7, score = 100 // 50 | push eax // 8b4204 | mov eax, dword ptr [edx + 4] // ffd0 | call eax // c644242400 | mov byte ptr [esp + 0x24], 0 // 8b442430 | mov eax, dword ptr [esp + 0x30] // 83c0f0 | add eax, -0x10 // 8d480c | lea ecx, dword ptr [eax + 0xc] $sequence_4 = { 83c404 56 8bf8 ff15???????? 8b45f4 8b5c241c 8b542414 } // n = 7, score = 100 // 83c404 | add esp, 4 // 56 | push esi // 8bf8 | mov edi, eax // ff15???????? | // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 8b5c241c | mov ebx, dword ptr [esp + 0x1c] // 8b542414 | mov edx, dword ptr [esp + 0x14] $sequence_5 = { 51 e8???????? c64424702c 8b10 8b442424 8b7c2478 } // n = 6, score = 100 // 51 | push ecx // e8???????? | // c64424702c | mov byte ptr [esp + 0x70], 0x2c // 8b10 | mov edx, dword ptr [eax] // 8b442424 | mov eax, dword ptr [esp + 0x24] // 8b7c2478 | mov edi, dword ptr [esp + 0x78] $sequence_6 = { 56 8bf8 ff15???????? 8b6c2424 8d442418 50 6a01 } // n = 7, score = 100 // 56 | push esi // 8bf8 | mov edi, eax // ff15???????? | // 8b6c2424 | mov ebp, dword ptr [esp + 0x24] // 8d442418 | lea eax, dword ptr [esp + 0x18] // 50 | push eax // 6a01 | push 1 $sequence_7 = { b9???????? e8???????? c644243416 8b07 51 83e810 89642424 } // n = 7, score = 100 // b9???????? | // e8???????? | // c644243416 | mov byte ptr [esp + 0x34], 0x16 // 8b07 | mov eax, dword ptr [edi] // 51 | push ecx // 83e810 | sub eax, 0x10 // 89642424 | mov dword ptr [esp + 0x24], esp $sequence_8 = { 51 68???????? 8d542430 52 8bc6 c644247410 } // n = 6, score = 100 // 51 | push ecx // 68???????? | // 8d542430 | lea edx, dword ptr [esp + 0x30] // 52 | push edx // 8bc6 | mov eax, esi // c644247410 | mov byte ptr [esp + 0x74], 0x10 $sequence_9 = { 33c0 40 e9???????? 8365d800 c745dca4214100 a1???????? 8d4dd8 } // n = 7, score = 100 // 33c0 | xor eax, eax // 40 | inc eax // e9???????? | // 8365d800 | and dword ptr [ebp - 0x28], 0 // c745dca4214100 | mov dword ptr [ebp - 0x24], 0x4121a4 // a1???????? | // 8d4dd8 | lea ecx, dword ptr [ebp - 0x28] condition: 7 of them and filesize < 344064 }
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