Actor(s): Mofang
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rule win_shimrat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.shimrat." 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.shimrat" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8d85b0e7ffff 50 6a03 68???????? ff15???????? } // n = 5, score = 100 // 8d85b0e7ffff | lea eax, [ebp - 0x1850] // 50 | push eax // 6a03 | push 3 // 68???????? | // ff15???????? | $sequence_1 = { 6a04 6a00 8d45a8 50 8d4df0 e8???????? 50 } // n = 7, score = 100 // 6a04 | push 4 // 6a00 | push 0 // 8d45a8 | lea eax, [ebp - 0x58] // 50 | push eax // 8d4df0 | lea ecx, [ebp - 0x10] // e8???????? | // 50 | push eax $sequence_2 = { 68???????? 50 e8???????? 83661c00 59 59 ff15???????? } // n = 7, score = 100 // 68???????? | // 50 | push eax // e8???????? | // 83661c00 | and dword ptr [esi + 0x1c], 0 // 59 | pop ecx // 59 | pop ecx // ff15???????? | $sequence_3 = { c9 c20c00 6a08 8d4d08 e8???????? 0fbef0 } // n = 6, score = 100 // c9 | leave // c20c00 | ret 0xc // 6a08 | push 8 // 8d4d08 | lea ecx, [ebp + 8] // e8???????? | // 0fbef0 | movsx esi, al $sequence_4 = { 8b7510 40 50 891e e8???????? 59 8906 } // n = 7, score = 100 // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 40 | inc eax // 50 | push eax // 891e | mov dword ptr [esi], ebx // e8???????? | // 59 | pop ecx // 8906 | mov dword ptr [esi], eax $sequence_5 = { ff37 ff15???????? 85c0 741b ff37 } // n = 5, score = 100 // ff37 | push dword ptr [edi] // ff15???????? | // 85c0 | test eax, eax // 741b | je 0x1d // ff37 | push dword ptr [edi] $sequence_6 = { 0f8512fdffff 83ec0c 8d45f0 8bcc 50 e8???????? } // n = 6, score = 100 // 0f8512fdffff | jne 0xfffffd18 // 83ec0c | sub esp, 0xc // 8d45f0 | lea eax, [ebp - 0x10] // 8bcc | mov ecx, esp // 50 | push eax // e8???????? | $sequence_7 = { 83ec30 53 56 57 8bf9 8d4df4 e8???????? } // n = 7, score = 100 // 83ec30 | sub esp, 0x30 // 53 | push ebx // 56 | push esi // 57 | push edi // 8bf9 | mov edi, ecx // 8d4df4 | lea ecx, [ebp - 0xc] // e8???????? | $sequence_8 = { e8???????? 8d45d8 50 8bcb e8???????? 50 8d4d08 } // n = 7, score = 100 // e8???????? | // 8d45d8 | lea eax, [ebp - 0x28] // 50 | push eax // 8bcb | mov ecx, ebx // e8???????? | // 50 | push eax // 8d4d08 | lea ecx, [ebp + 8] $sequence_9 = { ff37 8b3d???????? ffd7 53 } // n = 4, score = 100 // ff37 | push dword ptr [edi] // 8b3d???????? | // ffd7 | call edi // 53 | push ebx condition: 7 of them and filesize < 65536 }
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