Actor(s): Mirage
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rule win_miragefox_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.miragefox." 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.miragefox" 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 = { 5f 5e 5b c9 c3 81410c08880000 ff492c } // n = 7, score = 100 // 5f | pop edi // 5e | pop esi // 5b | pop ebx // c9 | leave // c3 | ret // 81410c08880000 | add dword ptr [ecx + 0xc], 0x8808 // ff492c | dec dword ptr [ecx + 0x2c] $sequence_1 = { 83c008 6808880000 884508 8d85f0effeff 56 50 e8???????? } // n = 7, score = 100 // 83c008 | add eax, 8 // 6808880000 | push 0x8808 // 884508 | mov byte ptr [ebp + 8], al // 8d85f0effeff | lea eax, [ebp - 0x11010] // 56 | push esi // 50 | push eax // e8???????? | $sequence_2 = { 57 bb48010000 8975fc 8b7e08 8b460c } // n = 5, score = 100 // 57 | push edi // bb48010000 | mov ebx, 0x148 // 8975fc | mov dword ptr [ebp - 4], esi // 8b7e08 | mov edi, dword ptr [esi + 8] // 8b460c | mov eax, dword ptr [esi + 0xc] $sequence_3 = { 33c0 69c048010000 50 e8???????? 8945ec } // n = 5, score = 100 // 33c0 | xor eax, eax // 69c048010000 | imul eax, eax, 0x148 // 50 | push eax // e8???????? | // 8945ec | mov dword ptr [ebp - 0x14], eax $sequence_4 = { 68???????? 68???????? e8???????? 83c418 8935???????? ebaf } // n = 6, score = 100 // 68???????? | // 68???????? | // e8???????? | // 83c418 | add esp, 0x18 // 8935???????? | // ebaf | jmp 0xffffffb1 $sequence_5 = { 8bc6 808841f72a0008 40 3dff000000 72f1 53 e8???????? } // n = 7, score = 100 // 8bc6 | mov eax, esi // 808841f72a0008 | or byte ptr [eax + 0x2af741], 8 // 40 | inc eax // 3dff000000 | cmp eax, 0xff // 72f1 | jb 0xfffffff3 // 53 | push ebx // e8???????? | $sequence_6 = { eb6a bf14410000 3bcf 0f853dffffff 57 } // n = 5, score = 100 // eb6a | jmp 0x6c // bf14410000 | mov edi, 0x4114 // 3bcf | cmp ecx, edi // 0f853dffffff | jne 0xffffff43 // 57 | push edi $sequence_7 = { 50 e8???????? 83e804 8975ec 8d8e08880000 8d7b04 8930 } // n = 7, score = 100 // 50 | push eax // e8???????? | // 83e804 | sub eax, 4 // 8975ec | mov dword ptr [ebp - 0x14], esi // 8d8e08880000 | lea ecx, [esi + 0x8808] // 8d7b04 | lea edi, [ebx + 4] // 8930 | mov dword ptr [eax], esi $sequence_8 = { 50 8b45d8 66895dce 66895dd0 ff30 e8???????? } // n = 6, score = 100 // 50 | push eax // 8b45d8 | mov eax, dword ptr [ebp - 0x28] // 66895dce | mov word ptr [ebp - 0x32], bx // 66895dd0 | mov word ptr [ebp - 0x30], bx // ff30 | push dword ptr [eax] // e8???????? | $sequence_9 = { 33c0 807dea01 0f95c0 83c005 } // n = 4, score = 100 // 33c0 | xor eax, eax // 807dea01 | cmp byte ptr [ebp - 0x16], 1 // 0f95c0 | setne al // 83c005 | add eax, 5 condition: 7 of them and filesize < 286720 }
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