Actor(s): Calypso group
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rule win_flying_dutchman_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 66890c02 83c002 6685c9 75f1 e9???????? 8b85e8feffff 83e800 } // n = 7, score = 100 // 66890c02 | mov word ptr [edx + eax], cx // 83c002 | add eax, 2 // 6685c9 | test cx, cx // 75f1 | jne 0xfffffff3 // e9???????? | // 8b85e8feffff | mov eax, dword ptr [ebp - 0x118] // 83e800 | sub eax, 0 $sequence_1 = { 48 0f84f8000000 48 0f853d010000 83bd44fcffff06 7553 8b35???????? } // n = 7, score = 100 // 48 | dec eax // 0f84f8000000 | je 0xfe // 48 | dec eax // 0f853d010000 | jne 0x143 // 83bd44fcffff06 | cmp dword ptr [ebp - 0x3bc], 6 // 7553 | jne 0x55 // 8b35???????? | $sequence_2 = { 8bec 51 56 6a18 e8???????? 33f6 } // n = 6, score = 100 // 8bec | mov ebp, esp // 51 | push ecx // 56 | push esi // 6a18 | push 0x18 // e8???????? | // 33f6 | xor esi, esi $sequence_3 = { 8d442430 50 89742438 895c2434 68???????? eb40 57 } // n = 7, score = 100 // 8d442430 | lea eax, [esp + 0x30] // 50 | push eax // 89742438 | mov dword ptr [esp + 0x38], esi // 895c2434 | mov dword ptr [esp + 0x34], ebx // 68???????? | // eb40 | jmp 0x42 // 57 | push edi $sequence_4 = { ff75f0 f3a5 ff75f4 ff15???????? ff75f4 8b35???????? ffd6 } // n = 7, score = 100 // ff75f0 | push dword ptr [ebp - 0x10] // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // ff75f4 | push dword ptr [ebp - 0xc] // ff15???????? | // ff75f4 | push dword ptr [ebp - 0xc] // 8b35???????? | // ffd6 | call esi $sequence_5 = { 3bfb 7531 6a14 e8???????? 8bf0 59 } // n = 6, score = 100 // 3bfb | cmp edi, ebx // 7531 | jne 0x33 // 6a14 | push 0x14 // e8???????? | // 8bf0 | mov esi, eax // 59 | pop ecx $sequence_6 = { ff15???????? 3bc7 7504 33c0 eb1f 0fbf480a } // n = 6, score = 100 // ff15???????? | // 3bc7 | cmp eax, edi // 7504 | jne 6 // 33c0 | xor eax, eax // eb1f | jmp 0x21 // 0fbf480a | movsx ecx, word ptr [eax + 0xa] $sequence_7 = { 0f8489000000 48 747f 2ddb030000 } // n = 4, score = 100 // 0f8489000000 | je 0x8f // 48 | dec eax // 747f | je 0x81 // 2ddb030000 | sub eax, 0x3db $sequence_8 = { e8???????? 8be5 5d c20800 55 8bec 81eca8000000 } // n = 7, score = 100 // e8???????? | // 8be5 | mov esp, ebp // 5d | pop ebp // c20800 | ret 8 // 55 | push ebp // 8bec | mov ebp, esp // 81eca8000000 | sub esp, 0xa8 $sequence_9 = { 832600 83660400 83660800 c3 8b4b04 56 57 } // n = 7, score = 100 // 832600 | and dword ptr [esi], 0 // 83660400 | and dword ptr [esi + 4], 0 // 83660800 | and dword ptr [esi + 8], 0 // c3 | ret // 8b4b04 | mov ecx, dword ptr [ebx + 4] // 56 | push esi // 57 | push edi condition: 7 of them and filesize < 276480 }
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