Actor(s): Calypso group
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rule win_flying_dutchman_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "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 = { 6a02 58 668945ec 8d86d4000000 50 e8???????? 59 } // n = 7, score = 100 // 6a02 | push 2 // 58 | pop eax // 668945ec | mov word ptr [ebp - 0x14], ax // 8d86d4000000 | lea eax, dword ptr [esi + 0xd4] // 50 | push eax // e8???????? | // 59 | pop ecx $sequence_1 = { ebd1 8bc8 c1f905 8d3c8d60e90110 8bf0 83e61f c1e606 } // n = 7, score = 100 // ebd1 | jmp 0xffffffd3 // 8bc8 | mov ecx, eax // c1f905 | sar ecx, 5 // 8d3c8d60e90110 | lea edi, dword ptr [ecx*4 + 0x1001e960] // 8bf0 | mov esi, eax // 83e61f | and esi, 0x1f // c1e606 | shl esi, 6 $sequence_2 = { 89442408 33c0 39442408 750c ff74240c ff15???????? } // n = 6, score = 100 // 89442408 | mov dword ptr [esp + 8], eax // 33c0 | xor eax, eax // 39442408 | cmp dword ptr [esp + 8], eax // 750c | jne 0xe // ff74240c | push dword ptr [esp + 0xc] // ff15???????? | $sequence_3 = { 33ff 8db594fdffff e8???????? 6a01 } // n = 4, score = 100 // 33ff | xor edi, edi // 8db594fdffff | lea esi, dword ptr [ebp - 0x26c] // e8???????? | // 6a01 | push 1 $sequence_4 = { 837b1410 7204 8b03 eb02 8bc3 0fb65702 } // n = 6, score = 100 // 837b1410 | cmp dword ptr [ebx + 0x14], 0x10 // 7204 | jb 6 // 8b03 | mov eax, dword ptr [ebx] // eb02 | jmp 4 // 8bc3 | mov eax, ebx // 0fb65702 | movzx edx, byte ptr [edi + 2] $sequence_5 = { 8b5c2414 85c0 7408 89442418 3bd8 7d27 833eff } // n = 7, score = 100 // 8b5c2414 | mov ebx, dword ptr [esp + 0x14] // 85c0 | test eax, eax // 7408 | je 0xa // 89442418 | mov dword ptr [esp + 0x18], eax // 3bd8 | cmp ebx, eax // 7d27 | jge 0x29 // 833eff | cmp dword ptr [esi], -1 $sequence_6 = { 8d8580f7ffff 6a00 50 e8???????? ffb5d0fdffff b98b000000 } // n = 6, score = 100 // 8d8580f7ffff | lea eax, dword ptr [ebp - 0x880] // 6a00 | push 0 // 50 | push eax // e8???????? | // ffb5d0fdffff | push dword ptr [ebp - 0x230] // b98b000000 | mov ecx, 0x8b $sequence_7 = { 8d442418 50 89742420 895c241c 68???????? eb2a 57 } // n = 7, score = 100 // 8d442418 | lea eax, dword ptr [esp + 0x18] // 50 | push eax // 89742420 | mov dword ptr [esp + 0x20], esi // 895c241c | mov dword ptr [esp + 0x1c], ebx // 68???????? | // eb2a | jmp 0x2c // 57 | push edi $sequence_8 = { 8d45c2 53 50 e8???????? } // n = 4, score = 100 // 8d45c2 | lea eax, dword ptr [ebp - 0x3e] // 53 | push ebx // 50 | push eax // e8???????? | $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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