Actor(s): MosesStaff
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rule win_strifewater_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.strifewater_rat." 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.strifewater_rat" 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 = { 488905???????? ff15???????? 483305???????? 488d1534900600 488bcb 488905???????? } // n = 6, score = 100 // 488905???????? | // ff15???????? | // 483305???????? | // 488d1534900600 | dec eax // 488bcb | lea edx, [ebp + 0x150] // 488905???????? | $sequence_1 = { 7511 e8???????? 488bc8 488b10 ff5220 4c8bc8 } // n = 6, score = 100 // 7511 | add edx, edx // e8???????? | // 488bc8 | dec eax // 488b10 | movsx eax, dx // ff5220 | mov word ptr [ebp + eax*2 + 0x2720], cx // 4c8bc8 | inc cx $sequence_2 = { 488bd8 ebdd 4533ff 418bdf 4c8d0d1e96faff 4885db 750d } // n = 7, score = 100 // 488bd8 | jge 0x1ab // ebdd | dec eax // 4533ff | lea ecx, [0x6bd09] // 418bdf | mov al, byte ptr [eax + ecx] // 4c8d0d1e96faff | inc ecx // 4885db | mov byte ptr [edi], al // 750d | dec ebp $sequence_3 = { 488d05bb720600 488bf9 488901 8bda 488b4910 e8???????? 488b4f18 } // n = 7, score = 100 // 488d05bb720600 | mov esi, 1 // 488bf9 | mov dword ptr [esp + 0xb0], esi // 488901 | and dword ptr [ebx + 8], 0 // 8bda | dec eax // 488b4910 | lea ecx, [0x656e8] // e8???????? | // 488b4f18 | dec eax $sequence_4 = { 48ffc2 4d8bc6 488b8d30010000 e8???????? 48895c2420 4c8d8d900f0000 4c8d8528020000 } // n = 7, score = 100 // 48ffc2 | dec eax // 4d8bc6 | lea ecx, [esp + 0x20] // 488b8d30010000 | dec eax // e8???????? | // 48895c2420 | lea edx, [0x617d5] // 4c8d8d900f0000 | dec eax // 4c8d8528020000 | lea ecx, [esp + 0x20] $sequence_5 = { f20f114c0110 0fb705???????? 6689441118 8a05???????? 8844111a 8bdd 41891f } // n = 7, score = 100 // f20f114c0110 | je 0xec // 0fb705???????? | // 6689441118 | dec eax // 8a05???????? | // 8844111a | mov eax, dword ptr [ebx + 0x18] // 8bdd | dec eax // 41891f | mov dword ptr [eax], edi $sequence_6 = { 498b4e08 4c8d4508 33d2 ff15???????? 488b7508 4c8d4530 488bce } // n = 7, score = 100 // 498b4e08 | movdqu xmmword ptr [ebp - 0x30], xmm0 // 4c8d4508 | movups xmm1, xmmword ptr [edi] // 33d2 | movdqu xmmword ptr [ebp - 0x20], xmm1 // ff15???????? | // 488b7508 | dec eax // 4c8d4530 | lea eax, [0x50c69] // 488bce | dec esp $sequence_7 = { 488d1565f20500 488d4d60 e8???????? cc } // n = 4, score = 100 // 488d1565f20500 | inc esp // 488d4d60 | mov byte ptr [ebp + 0x150], bh // e8???????? | // cc | inc esp $sequence_8 = { 0fb7d0 488d4c2420 81ca00000780 85c0 0f4ed0 e8???????? 488d1536f40500 } // n = 7, score = 100 // 0fb7d0 | mov dword ptr [esi], eax // 488d4c2420 | dec eax // 81ca00000780 | lea ecx, [ebp - 0x60] // 85c0 | movups xmm0, xmmword ptr [eax] // 0f4ed0 | movups xmmword ptr [esi + 0x10], xmm0 // e8???????? | // 488d1536f40500 | dec eax $sequence_9 = { e9???????? 4489742440 bbf4010000 448bc3 33d2 488d8d60020000 e8???????? } // n = 7, score = 100 // e9???????? | // 4489742440 | lea ecx, [ebp - 0x50] // bbf4010000 | dec eax // 448bc3 | mov dword ptr [ebp + 0x190], eax // 33d2 | dec eax // 488d8d60020000 | mov edi, dword ptr [ebp + 0x198] // e8???????? | condition: 7 of them and filesize < 1552384 }
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