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rule win_funny_dream_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.funny_dream." 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.funny_dream" 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 = { ff15???????? 8bd8 c745f025735c2a 56 8d45f0 } // n = 5, score = 300 // ff15???????? | // 8bd8 | mov ebx, eax // c745f025735c2a | mov dword ptr [ebp - 0x10], 0x2a5c7325 // 56 | push esi // 8d45f0 | lea eax, [ebp - 0x10] $sequence_1 = { 50 6a00 6a00 6a00 ffb5b4feffff ff15???????? 6a40 } // n = 7, score = 300 // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // ffb5b4feffff | push dword ptr [ebp - 0x14c] // ff15???????? | // 6a40 | push 0x40 $sequence_2 = { 57 8945f8 8bf9 8b02 68???????? c745fc00000000 894508 } // n = 7, score = 300 // 57 | push edi // 8945f8 | mov dword ptr [ebp - 8], eax // 8bf9 | mov edi, ecx // 8b02 | mov eax, dword ptr [edx] // 68???????? | // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 894508 | mov dword ptr [ebp + 8], eax $sequence_3 = { e8???????? 8be5 5d c20800 0f57c0 c744244a00000000 b802000000 } // n = 7, score = 300 // e8???????? | // 8be5 | mov esp, ebp // 5d | pop ebp // c20800 | ret 8 // 0f57c0 | xorps xmm0, xmm0 // c744244a00000000 | mov dword ptr [esp + 0x4a], 0 // b802000000 | mov eax, 2 $sequence_4 = { 7736 b902000000 66890f 8b400c 8b00 } // n = 5, score = 300 // 7736 | ja 0x38 // b902000000 | mov ecx, 2 // 66890f | mov word ptr [edi], cx // 8b400c | mov eax, dword ptr [eax + 0xc] // 8b00 | mov eax, dword ptr [eax] $sequence_5 = { 8a02 42 84c0 75f9 8dbdb4fdffff 2bd6 } // n = 6, score = 300 // 8a02 | mov al, byte ptr [edx] // 42 | inc edx // 84c0 | test al, al // 75f9 | jne 0xfffffffb // 8dbdb4fdffff | lea edi, [ebp - 0x24c] // 2bd6 | sub edx, esi $sequence_6 = { 53 56 8b35???????? 57 68???????? c745d800000000 c745d004000000 } // n = 7, score = 300 // 53 | push ebx // 56 | push esi // 8b35???????? | // 57 | push edi // 68???????? | // c745d800000000 | mov dword ptr [ebp - 0x28], 0 // c745d004000000 | mov dword ptr [ebp - 0x30], 4 $sequence_7 = { 6a78 8d8500ffffff c685effdffff00 6a00 50 8bf1 c785f8feffff74657374 } // n = 7, score = 300 // 6a78 | push 0x78 // 8d8500ffffff | lea eax, [ebp - 0x100] // c685effdffff00 | mov byte ptr [ebp - 0x211], 0 // 6a00 | push 0 // 50 | push eax // 8bf1 | mov esi, ecx // c785f8feffff74657374 | mov dword ptr [ebp - 0x108], 0x74736574 $sequence_8 = { 53 8a4810 8d4602 50 884e01 e8???????? 8b4508 } // n = 7, score = 300 // 53 | push ebx // 8a4810 | mov cl, byte ptr [eax + 0x10] // 8d4602 | lea eax, [esi + 2] // 50 | push eax // 884e01 | mov byte ptr [esi + 1], cl // e8???????? | // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_9 = { 8d85c2fdffff c785b4fdffff2f632072 6a00 50 c785b8fdffff6d646972 c785bcfdffff202f7320 66c785c0fdffff2f71 } // n = 7, score = 300 // 8d85c2fdffff | lea eax, [ebp - 0x23e] // c785b4fdffff2f632072 | mov dword ptr [ebp - 0x24c], 0x7220632f // 6a00 | push 0 // 50 | push eax // c785b8fdffff6d646972 | mov dword ptr [ebp - 0x248], 0x7269646d // c785bcfdffff202f7320 | mov dword ptr [ebp - 0x244], 0x20732f20 // 66c785c0fdffff2f71 | mov word ptr [ebp - 0x240], 0x712f condition: 7 of them and filesize < 393216 }
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