Actor(s): Mirage
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rule win_miragefox_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "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 = { 8d4604 6a19 50 57 e8???????? } // n = 5, score = 100 // 8d4604 | lea eax, dword ptr [esi + 4] // 6a19 | push 0x19 // 50 | push eax // 57 | push edi // e8???????? | $sequence_1 = { ff2485b9902900 33c0 834df8ff 8945c0 } // n = 4, score = 100 // ff2485b9902900 | jmp dword ptr [eax*4 + 0x2990b9] // 33c0 | xor eax, eax // 834df8ff | or dword ptr [ebp - 8], 0xffffffff // 8945c0 | mov dword ptr [ebp - 0x40], eax $sequence_2 = { ebc3 b8???????? c3 b8???????? e8???????? b85c840000 e8???????? } // n = 7, score = 100 // ebc3 | jmp 0xffffffc5 // b8???????? | // c3 | ret // b8???????? | // e8???????? | // b85c840000 | mov eax, 0x845c // e8???????? | $sequence_3 = { b85c840000 e8???????? 53 8b5d08 56 57 6a09 } // n = 7, score = 100 // b85c840000 | mov eax, 0x845c // e8???????? | // 53 | push ebx // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 56 | push esi // 57 | push edi // 6a09 | push 9 $sequence_4 = { 304e29 005c4e29 00804e290023 d18a0688078a } // n = 4, score = 100 // 304e29 | xor byte ptr [esi + 0x29], cl // 005c4e29 | add byte ptr [esi + ecx*2 + 0x29], bl // 00804e290023 | add byte ptr [eax + 0x2300294e], al // d18a0688078a | ror dword ptr [edx - 0x75f877fa], 1 $sequence_5 = { eb1b 8b4514 f6c303 7509 8b0c85c05e2a00 eb07 8b0c85f45e2a00 } // n = 7, score = 100 // eb1b | jmp 0x1d // 8b4514 | mov eax, dword ptr [ebp + 0x14] // f6c303 | test bl, 3 // 7509 | jne 0xb // 8b0c85c05e2a00 | mov ecx, dword ptr [eax*4 + 0x2a5ec0] // eb07 | jmp 9 // 8b0c85f45e2a00 | mov ecx, dword ptr [eax*4 + 0x2a5ef4] $sequence_6 = { 8d85acfcffff 50 e8???????? 59 59 e8???????? be???????? } // n = 7, score = 100 // 8d85acfcffff | lea eax, dword ptr [ebp - 0x354] // 50 | push eax // e8???????? | // 59 | pop ecx // 59 | pop ecx // e8???????? | // be???????? | $sequence_7 = { 8885ec7fffff 8d85e0f7feff 50 e8???????? } // n = 4, score = 100 // 8885ec7fffff | mov byte ptr [ebp - 0x8014], al // 8d85e0f7feff | lea eax, dword ptr [ebp - 0x10820] // 50 | push eax // e8???????? | $sequence_8 = { 0fb6da f68341f72a0004 7406 8816 } // n = 4, score = 100 // 0fb6da | movzx ebx, dl // f68341f72a0004 | test byte ptr [ebx + 0x2af741], 4 // 7406 | je 8 // 8816 | mov byte ptr [esi], dl $sequence_9 = { 8d45f4 50 6819000200 56 68???????? 6801000080 ff15???????? } // n = 7, score = 100 // 8d45f4 | lea eax, dword ptr [ebp - 0xc] // 50 | push eax // 6819000200 | push 0x20019 // 56 | push esi // 68???????? | // 6801000080 | push 0x80000001 // ff15???????? | condition: 7 of them and filesize < 286720 }
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