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rule win_funny_dream_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 64a300000000 8bf1 89b574fbffff 8b7d08 8d85dcfdffff } // n = 5, score = 200 // 64a300000000 | mov dword ptr fs:[0], eax // 8bf1 | mov esi, ecx // 89b574fbffff | mov dword ptr [ebp - 0x48c], esi // 8b7d08 | mov edi, dword ptr [ebp + 8] // 8d85dcfdffff | lea eax, [ebp - 0x224] $sequence_1 = { 0f85ed000000 47 6a3b 57 e8???????? } // n = 5, score = 200 // 0f85ed000000 | jne 0xf3 // 47 | inc edi // 6a3b | push 0x3b // 57 | push edi // e8???????? | $sequence_2 = { 894628 8a4610 8885e9feffff 8d85e8feffff 50 e8???????? 6a00 } // n = 7, score = 200 // 894628 | mov dword ptr [esi + 0x28], eax // 8a4610 | mov al, byte ptr [esi + 0x10] // 8885e9feffff | mov byte ptr [ebp - 0x117], al // 8d85e8feffff | lea eax, [ebp - 0x118] // 50 | push eax // e8???????? | // 6a00 | push 0 $sequence_3 = { 3b5f14 7423 660f1f840000000000 8b33 } // n = 4, score = 200 // 3b5f14 | cmp ebx, dword ptr [edi + 0x14] // 7423 | je 0x25 // 660f1f840000000000 | nop word ptr [eax + eax] // 8b33 | mov esi, dword ptr [ebx] $sequence_4 = { 8d45f4 50 8d856cfeffff 50 e8???????? 83c408 85c0 } // n = 7, score = 200 // 8d45f4 | lea eax, [ebp - 0xc] // 50 | push eax // 8d856cfeffff | lea eax, [ebp - 0x194] // 50 | push eax // e8???????? | // 83c408 | add esp, 8 // 85c0 | test eax, eax $sequence_5 = { ffd6 8d4710 50 ff15???????? 8b4f04 } // n = 5, score = 200 // ffd6 | call esi // 8d4710 | lea eax, [edi + 0x10] // 50 | push eax // ff15???????? | // 8b4f04 | mov ecx, dword ptr [edi + 4] $sequence_6 = { 84e4 0f85a6000000 85f6 0f849e000000 8bde 8d4b01 } // n = 6, score = 200 // 84e4 | test ah, ah // 0f85a6000000 | jne 0xac // 85f6 | test esi, esi // 0f849e000000 | je 0xa4 // 8bde | mov ebx, esi // 8d4b01 | lea ecx, [ebx + 1] $sequence_7 = { ffd0 8bf0 83feff 0f84c4000000 8d45f8 50 56 } // n = 7, score = 200 // ffd0 | call eax // 8bf0 | mov esi, eax // 83feff | cmp esi, -1 // 0f84c4000000 | je 0xca // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // 56 | push esi $sequence_8 = { 8db5d0fdffff 2410 8d4e01 88041f 47 6690 8a06 } // n = 7, score = 200 // 8db5d0fdffff | lea esi, [ebp - 0x230] // 2410 | and al, 0x10 // 8d4e01 | lea ecx, [esi + 1] // 88041f | mov byte ptr [edi + ebx], al // 47 | inc edi // 6690 | nop // 8a06 | mov al, byte ptr [esi] $sequence_9 = { e8???????? 57 e8???????? 83c404 8bfe 3b7314 } // n = 6, score = 200 // e8???????? | // 57 | push edi // e8???????? | // 83c404 | add esp, 4 // 8bfe | mov edi, esi // 3b7314 | cmp esi, dword ptr [ebx + 0x14] condition: 7 of them and filesize < 393216 }
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