Actor(s): Calypso group
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rule win_flying_dutchman_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.flying_dutchman." 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.flying_dutchman" 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 = { ff7508 e8???????? 8bf8 8d4708 50 894608 e8???????? } // n = 7, score = 100 // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 8bf8 | mov edi, eax // 8d4708 | lea eax, [edi + 8] // 50 | push eax // 894608 | mov dword ptr [esi + 8], eax // e8???????? | $sequence_1 = { 53 898584e2ffff 8d8568deffff 50 } // n = 4, score = 100 // 53 | push ebx // 898584e2ffff | mov dword ptr [ebp - 0x1d7c], eax // 8d8568deffff | lea eax, [ebp - 0x2198] // 50 | push eax $sequence_2 = { 50 8d85ecfeffff 68???????? 50 c645fc06 e8???????? } // n = 6, score = 100 // 50 | push eax // 8d85ecfeffff | lea eax, [ebp - 0x114] // 68???????? | // 50 | push eax // c645fc06 | mov byte ptr [ebp - 4], 6 // e8???????? | $sequence_3 = { 03d8 899decbfffff 3b9df0bfffff 72c5 57 8d9ee8000000 6a00 } // n = 7, score = 100 // 03d8 | add ebx, eax // 899decbfffff | mov dword ptr [ebp - 0x4014], ebx // 3b9df0bfffff | cmp ebx, dword ptr [ebp - 0x4010] // 72c5 | jb 0xffffffc7 // 57 | push edi // 8d9ee8000000 | lea ebx, [esi + 0xe8] // 6a00 | push 0 $sequence_4 = { 50 e8???????? 8945ec 8b45d8 2b45d4 bb48060000 59 } // n = 7, score = 100 // 50 | push eax // e8???????? | // 8945ec | mov dword ptr [ebp - 0x14], eax // 8b45d8 | mov eax, dword ptr [ebp - 0x28] // 2b45d4 | sub eax, dword ptr [ebp - 0x2c] // bb48060000 | mov ebx, 0x648 // 59 | pop ecx $sequence_5 = { 83c40c 89bd50ffffff 89bd54ffffff 89bd60ffffff 89bd64ffffff } // n = 5, score = 100 // 83c40c | add esp, 0xc // 89bd50ffffff | mov dword ptr [ebp - 0xb0], edi // 89bd54ffffff | mov dword ptr [ebp - 0xac], edi // 89bd60ffffff | mov dword ptr [ebp - 0xa0], edi // 89bd64ffffff | mov dword ptr [ebp - 0x9c], edi $sequence_6 = { 6685c9 75f1 e9???????? b8???????? 2bd0 0fb708 66890c02 } // n = 7, score = 100 // 6685c9 | test cx, cx // 75f1 | jne 0xfffffff3 // e9???????? | // b8???????? | // 2bd0 | sub edx, eax // 0fb708 | movzx ecx, word ptr [eax] // 66890c02 | mov word ptr [edx + eax], cx $sequence_7 = { b984000000 f3a5 8b45d8 2b45d4 8bcb } // n = 5, score = 100 // b984000000 | mov ecx, 0x84 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8b45d8 | mov eax, dword ptr [ebp - 0x28] // 2b45d4 | sub eax, dword ptr [ebp - 0x2c] // 8bcb | mov ecx, ebx $sequence_8 = { 56 8b7508 57 bbc8000000 53 6a00 bf???????? } // n = 7, score = 100 // 56 | push esi // 8b7508 | mov esi, dword ptr [ebp + 8] // 57 | push edi // bbc8000000 | mov ebx, 0xc8 // 53 | push ebx // 6a00 | push 0 // bf???????? | $sequence_9 = { 0fb6c0 c1e804 83e001 898558f9ffff 8d8510f7ffff 50 b84c020000 } // n = 7, score = 100 // 0fb6c0 | movzx eax, al // c1e804 | shr eax, 4 // 83e001 | and eax, 1 // 898558f9ffff | mov dword ptr [ebp - 0x6a8], eax // 8d8510f7ffff | lea eax, [ebp - 0x8f0] // 50 | push eax // b84c020000 | mov eax, 0x24c condition: 7 of them and filesize < 276480 }
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