Actor(s): Dust Storm
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rule win_misdat_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.misdat" 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 = { 8b8568fdffff e8???????? 50 e8???????? eb1b ba???????? } // n = 6, score = 200 // 8b8568fdffff | mov eax, dword ptr [ebp - 0x298] // e8???????? | // 50 | push eax // e8???????? | // eb1b | jmp 0x1d // ba???????? | $sequence_1 = { 8d45f0 50 8b45fc e8???????? 50 6802000080 e8???????? } // n = 7, score = 200 // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax // 8b45fc | mov eax, dword ptr [ebp - 4] // e8???????? | // 50 | push eax // 6802000080 | push 0x80000002 // e8???????? | $sequence_2 = { 8b15???????? e8???????? 8b45f0 8d55f4 e8???????? ff75f4 } // n = 6, score = 200 // 8b15???????? | // e8???????? | // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 8d55f4 | lea edx, [ebp - 0xc] // e8???????? | // ff75f4 | push dword ptr [ebp - 0xc] $sequence_3 = { 57 e8???????? 890424 8bd4 } // n = 4, score = 200 // 57 | push edi // e8???????? | // 890424 | mov dword ptr [esp], eax // 8bd4 | mov edx, esp $sequence_4 = { 8b45f8 e8???????? e9???????? 8d8d54fdffff ba???????? 8b45f8 e8???????? } // n = 7, score = 200 // 8b45f8 | mov eax, dword ptr [ebp - 8] // e8???????? | // e9???????? | // 8d8d54fdffff | lea ecx, [ebp - 0x2ac] // ba???????? | // 8b45f8 | mov eax, dword ptr [ebp - 8] // e8???????? | $sequence_5 = { 03d1 8a92cce04000 52 5a 88543d02 8a541e02 } // n = 6, score = 200 // 03d1 | add edx, ecx // 8a92cce04000 | mov dl, byte ptr [edx + 0x40e0cc] // 52 | push edx // 5a | pop edx // 88543d02 | mov byte ptr [ebp + edi + 2], dl // 8a541e02 | mov dl, byte ptr [esi + ebx + 2] $sequence_6 = { 8d442410 50 8d442410 50 6a00 6a00 56 } // n = 7, score = 200 // 8d442410 | lea eax, [esp + 0x10] // 50 | push eax // 8d442410 | lea eax, [esp + 0x10] // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 // 56 | push esi $sequence_7 = { 741b 56 8b45f4 e8???????? 8bc8 83e902 ba01000000 } // n = 7, score = 200 // 741b | je 0x1d // 56 | push esi // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // e8???????? | // 8bc8 | mov ecx, eax // 83e902 | sub ecx, 2 // ba01000000 | mov edx, 1 $sequence_8 = { 8bd0 8d45d4 e8???????? 8b45d4 5a } // n = 5, score = 200 // 8bd0 | mov edx, eax // 8d45d4 | lea eax, [ebp - 0x2c] // e8???????? | // 8b45d4 | mov eax, dword ptr [ebp - 0x2c] // 5a | pop edx $sequence_9 = { 8b45f0 8d55f4 e8???????? ff75f4 8d45e8 } // n = 5, score = 200 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 8d55f4 | lea edx, [ebp - 0xc] // e8???????? | // ff75f4 | push dword ptr [ebp - 0xc] // 8d45e8 | lea eax, [ebp - 0x18] condition: 7 of them and filesize < 180224 }
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