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rule win_deadwood_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.deadwood." 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.deadwood" 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 = { 6a20 8d4dac 51 57 57 6800005600 } // n = 6, score = 100 // 6a20 | push 0x20 // 8d4dac | lea ecx, [ebp - 0x54] // 51 | push ecx // 57 | push edi // 57 | push edi // 6800005600 | push 0x560000 $sequence_1 = { ff2495d87a4000 8b7508 6a05 56 e8???????? 83c408 8bc6 } // n = 7, score = 100 // ff2495d87a4000 | jmp dword ptr [edx*4 + 0x407ad8] // 8b7508 | mov esi, dword ptr [ebp + 8] // 6a05 | push 5 // 56 | push esi // e8???????? | // 83c408 | add esp, 8 // 8bc6 | mov eax, esi $sequence_2 = { 50 a1???????? 8b5018 b9???????? ffd2 884604 c74608???????? } // n = 7, score = 100 // 50 | push eax // a1???????? | // 8b5018 | mov edx, dword ptr [eax + 0x18] // b9???????? | // ffd2 | call edx // 884604 | mov byte ptr [esi + 4], al // c74608???????? | $sequence_3 = { c706???????? c7460c40bb4500 8b4804 8d7e0c c744312030bb4500 8b5620 8b4204 } // n = 7, score = 100 // c706???????? | // c7460c40bb4500 | mov dword ptr [esi + 0xc], 0x45bb40 // 8b4804 | mov ecx, dword ptr [eax + 4] // 8d7e0c | lea edi, [esi + 0xc] // c744312030bb4500 | mov dword ptr [ecx + esi + 0x20], 0x45bb30 // 8b5620 | mov edx, dword ptr [esi + 0x20] // 8b4204 | mov eax, dword ptr [edx + 4] $sequence_4 = { 0f8738ffffff 8b4c242c f605????????20 7446 8b442430 2bc1 c1f803 } // n = 7, score = 100 // 0f8738ffffff | ja 0xffffff3e // 8b4c242c | mov ecx, dword ptr [esp + 0x2c] // f605????????20 | // 7446 | je 0x48 // 8b442430 | mov eax, dword ptr [esp + 0x30] // 2bc1 | sub eax, ecx // c1f803 | sar eax, 3 $sequence_5 = { e8???????? c645fcb9 68???????? b9???????? e8???????? 68???????? b9???????? } // n = 7, score = 100 // e8???????? | // c645fcb9 | mov byte ptr [ebp - 4], 0xb9 // 68???????? | // b9???????? | // e8???????? | // 68???????? | // b9???????? | $sequence_6 = { c645fc01 e8???????? 8b00 894508 8907 c645fc00 8b4510 } // n = 7, score = 100 // c645fc01 | mov byte ptr [ebp - 4], 1 // e8???????? | // 8b00 | mov eax, dword ptr [eax] // 894508 | mov dword ptr [ebp + 8], eax // 8907 | mov dword ptr [edi], eax // c645fc00 | mov byte ptr [ebp - 4], 0 // 8b4510 | mov eax, dword ptr [ebp + 0x10] $sequence_7 = { 8b4de0 8845bc 8b55bc 894dc4 8955c8 895dcc 8b470c } // n = 7, score = 100 // 8b4de0 | mov ecx, dword ptr [ebp - 0x20] // 8845bc | mov byte ptr [ebp - 0x44], al // 8b55bc | mov edx, dword ptr [ebp - 0x44] // 894dc4 | mov dword ptr [ebp - 0x3c], ecx // 8955c8 | mov dword ptr [ebp - 0x38], edx // 895dcc | mov dword ptr [ebp - 0x34], ebx // 8b470c | mov eax, dword ptr [edi + 0xc] $sequence_8 = { c645fcb4 e8???????? 68???????? b9???????? c645fcb5 e8???????? 68???????? } // n = 7, score = 100 // c645fcb4 | mov byte ptr [ebp - 4], 0xb4 // e8???????? | // 68???????? | // b9???????? | // c645fcb5 | mov byte ptr [ebp - 4], 0xb5 // e8???????? | // 68???????? | $sequence_9 = { 56 8b7508 53 894dfc 57 8d4900 } // n = 6, score = 100 // 56 | push esi // 8b7508 | mov esi, dword ptr [ebp + 8] // 53 | push ebx // 894dfc | mov dword ptr [ebp - 4], ecx // 57 | push edi // 8d4900 | lea ecx, [ecx] condition: 7 of them and filesize < 1055744 }
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