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rule win_metamorfo_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-10-14" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.5.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.metamorfo" malpedia_rule_date = "20201014" malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9" malpedia_version = "20201014" 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 = { 8945ec 8b45fc 8b4044 0345ec 8b55fc 8b5254 8d0482 } // n = 7, score = 100 // 8945ec | mov dword ptr [ebp - 0x14], eax // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b4044 | mov eax, dword ptr [eax + 0x44] // 0345ec | add eax, dword ptr [ebp - 0x14] // 8b55fc | mov edx, dword ptr [ebp - 4] // 8b5254 | mov edx, dword ptr [edx + 0x54] // 8d0482 | lea eax, [edx + eax*4] $sequence_1 = { e8???????? 68837f0000 8b45dc 50 e8???????? 68847f0000 8b45d8 } // n = 7, score = 100 // e8???????? | // 68837f0000 | push 0x7f83 // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 50 | push eax // e8???????? | // 68847f0000 | push 0x7f84 // 8b45d8 | mov eax, dword ptr [ebp - 0x28] $sequence_2 = { c78688000000ffffffff c7868c000000ffffffff 33c0 898698000000 33c0 8986a0000000 33c0 } // n = 7, score = 100 // c78688000000ffffffff | mov dword ptr [esi + 0x88], 0xffffffff // c7868c000000ffffffff | mov dword ptr [esi + 0x8c], 0xffffffff // 33c0 | xor eax, eax // 898698000000 | mov dword ptr [esi + 0x98], eax // 33c0 | xor eax, eax // 8986a0000000 | mov dword ptr [esi + 0xa0], eax // 33c0 | xor eax, eax $sequence_3 = { d918 9b 8b45f8 d9e8 d86804 8b45f8 d95804 } // n = 7, score = 100 // d918 | fstp dword ptr [eax] // 9b | wait // 8b45f8 | mov eax, dword ptr [ebp - 8] // d9e8 | fld1 // d86804 | fsubr dword ptr [eax + 4] // 8b45f8 | mov eax, dword ptr [ebp - 8] // d95804 | fstp dword ptr [eax + 4] $sequence_4 = { c1ea08 8b45b0 8810 47 43 4e 0f8561ffffff } // n = 7, score = 100 // c1ea08 | shr edx, 8 // 8b45b0 | mov eax, dword ptr [ebp - 0x50] // 8810 | mov byte ptr [eax], dl // 47 | inc edi // 43 | inc ebx // 4e | dec esi // 0f8561ffffff | jne 0xffffff67 $sequence_5 = { e8???????? 84c0 7406 8bb7a4020000 8bc6 5f 5e } // n = 7, score = 100 // e8???????? | // 84c0 | test al, al // 7406 | je 8 // 8bb7a4020000 | mov esi, dword ptr [edi + 0x2a4] // 8bc6 | mov eax, esi // 5f | pop edi // 5e | pop esi $sequence_6 = { e8???????? 0fb64014 2c01 720d fec8 0f84d6010000 e9???????? } // n = 7, score = 100 // e8???????? | // 0fb64014 | movzx eax, byte ptr [eax + 0x14] // 2c01 | sub al, 1 // 720d | jb 0xf // fec8 | dec al // 0f84d6010000 | je 0x1dc // e9???????? | $sequence_7 = { a3???????? 8b45f8 e8???????? b8???????? e8???????? b8???????? e8???????? } // n = 7, score = 100 // a3???????? | // 8b45f8 | mov eax, dword ptr [ebp - 8] // e8???????? | // b8???????? | // e8???????? | // b8???????? | // e8???????? | $sequence_8 = { ffb540faffff 68???????? ff35???????? 68???????? ff35???????? 68???????? 8d8550faffff } // n = 7, score = 100 // ffb540faffff | push dword ptr [ebp - 0x5c0] // 68???????? | // ff35???????? | // 68???????? | // ff35???????? | // 68???????? | // 8d8550faffff | lea eax, [ebp - 0x5b0] $sequence_9 = { ff5230 48 8945ec 8bc3 8b10 ff5224 8b55b4 } // n = 7, score = 100 // ff5230 | call dword ptr [edx + 0x30] // 48 | dec eax // 8945ec | mov dword ptr [ebp - 0x14], eax // 8bc3 | mov eax, ebx // 8b10 | mov edx, dword ptr [eax] // ff5224 | call dword ptr [edx + 0x24] // 8b55b4 | mov edx, dword ptr [ebp - 0x4c] condition: 7 of them and filesize < 20349952 }
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