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rule win_funny_dream_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 56 ffd0 6a05 6a40 b371 ff15???????? 8bf0 } // n = 7, score = 300 // 56 | push esi // ffd0 | call eax // 6a05 | push 5 // 6a40 | push 0x40 // b371 | mov bl, 0x71 // ff15???????? | // 8bf0 | mov esi, eax $sequence_1 = { 83c404 8bde 3b7714 75e6 8b4714 } // n = 5, score = 300 // 83c404 | add esp, 4 // 8bde | mov ebx, esi // 3b7714 | cmp esi, dword ptr [edi + 0x14] // 75e6 | jne 0xffffffe8 // 8b4714 | mov eax, dword ptr [edi + 0x14] $sequence_2 = { ffd7 8b1d???????? 6896000000 ffd3 } // n = 4, score = 300 // ffd7 | call edi // 8b1d???????? | // 6896000000 | push 0x96 // ffd3 | call ebx $sequence_3 = { 7f19 6a00 6800020000 ff75fc ff75f8 ff15???????? 8bf0 } // n = 7, score = 300 // 7f19 | jg 0x1b // 6a00 | push 0 // 6800020000 | push 0x200 // ff75fc | push dword ptr [ebp - 4] // ff75f8 | push dword ptr [ebp - 8] // ff15???????? | // 8bf0 | mov esi, eax $sequence_4 = { 50 e8???????? 6800010000 8d85bcfeffff c785a8feffff40000000 } // n = 5, score = 300 // 50 | push eax // e8???????? | // 6800010000 | push 0x100 // 8d85bcfeffff | lea eax, [ebp - 0x144] // c785a8feffff40000000 | mov dword ptr [ebp - 0x158], 0x40 $sequence_5 = { 8d45e4 50 33f6 c745e45368656c c745e86c33322e c745ec646c6c00 } // n = 6, score = 300 // 8d45e4 | lea eax, [ebp - 0x1c] // 50 | push eax // 33f6 | xor esi, esi // c745e45368656c | mov dword ptr [ebp - 0x1c], 0x6c656853 // c745e86c33322e | mov dword ptr [ebp - 0x18], 0x2e32336c // c745ec646c6c00 | mov dword ptr [ebp - 0x14], 0x6c6c64 $sequence_6 = { c785bcfdffff01000000 668985c0fdffff 83c40c 8d85f8feffff c745dc6b65726e 898598fdffff } // n = 6, score = 300 // c785bcfdffff01000000 | mov dword ptr [ebp - 0x244], 1 // 668985c0fdffff | mov word ptr [ebp - 0x240], ax // 83c40c | add esp, 0xc // 8d85f8feffff | lea eax, [ebp - 0x108] // c745dc6b65726e | mov dword ptr [ebp - 0x24], 0x6e72656b // 898598fdffff | mov dword ptr [ebp - 0x268], eax $sequence_7 = { 8b4c2420 83c006 89442414 83ff0f 7c9f } // n = 5, score = 300 // 8b4c2420 | mov ecx, dword ptr [esp + 0x20] // 83c006 | add eax, 6 // 89442414 | mov dword ptr [esp + 0x14], eax // 83ff0f | cmp edi, 0xf // 7c9f | jl 0xffffffa1 $sequence_8 = { 50 ffd7 8b4620 85c0 0f84b0010000 50 ffd7 } // n = 7, score = 300 // 50 | push eax // ffd7 | call edi // 8b4620 | mov eax, dword ptr [esi + 0x20] // 85c0 | test eax, eax // 0f84b0010000 | je 0x1b6 // 50 | push eax // ffd7 | call edi $sequence_9 = { 8b85c4fdffff 89441f05 8b85b8fdffff 89441f09 8b85bcfdffff 89441f0d 83c711 } // n = 7, score = 300 // 8b85c4fdffff | mov eax, dword ptr [ebp - 0x23c] // 89441f05 | mov dword ptr [edi + ebx + 5], eax // 8b85b8fdffff | mov eax, dword ptr [ebp - 0x248] // 89441f09 | mov dword ptr [edi + ebx + 9], eax // 8b85bcfdffff | mov eax, dword ptr [ebp - 0x244] // 89441f0d | mov dword ptr [edi + ebx + 0xd], eax // 83c711 | add edi, 0x11 condition: 7 of them and filesize < 393216 }
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