Actor(s): MosesStaff
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rule win_strifewater_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 83630800 488d0d10400500 48890b c6434400 448ac6 488bd0 } // n = 6, score = 100 // 83630800 | dec eax // 488d0d10400500 | lea edx, [0x825e1] // 48890b | jmp 0x486 // c6434400 | dec eax // 448ac6 | mov dword ptr [esp + 0xc0], eax // 488bd0 | dec eax $sequence_1 = { 4183c9ff 4d8bc7 66448926 4889742420 8d4a03 ff15???????? f7d8 } // n = 7, score = 100 // 4183c9ff | nop // 4d8bc7 | mov edi, dword ptr [esp + 0x70] // 66448926 | dec eax // 4889742420 | lea edx, [esp + 0x60] // 8d4a03 | dec eax // ff15???????? | // f7d8 | cmp dword ptr [esp + 0x78], 0x10 $sequence_2 = { 663b3d???????? 0f8559010000 663b1d???????? 0f854c010000 66443b35???????? 0f853e010000 } // n = 6, score = 100 // 663b3d???????? | // 0f8559010000 | lea edi, [eax + esi] // 663b1d???????? | // 0f854c010000 | dec ebp // 66443b35???????? | // 0f853e010000 | test edi, edi $sequence_3 = { 488d05bb720600 488bf9 488901 8bda 488b4910 e8???????? 488b4f18 } // n = 7, score = 100 // 488d05bb720600 | dec eax // 488bf9 | lea ecx, [esp + 0x20] // 488901 | ret // 8bda | dec eax // 488b4910 | lea edx, [0x4f06b] // e8???????? | // 488b4f18 | dec eax $sequence_4 = { 4803c0 480101 4803db eb22 498b06 498bce } // n = 6, score = 100 // 4803c0 | mov word ptr [ebp + eax + 0x190], cx // 480101 | js 0x975 // 4803db | cmp eax, 0xe4 // eb22 | jae 0x975 // 498b06 | dec eax // 498bce | cwde $sequence_5 = { 488bf8 48898424c0000000 488b4e08 4885c9 7509 488d15fc350900 eb0d } // n = 7, score = 100 // 488bf8 | nop // 48898424c0000000 | dec eax // 488b4e08 | lea edx, [ebp + 0x150] // 4885c9 | dec eax // 7509 | lea ecx, [ebp + 0x190] // 488d15fc350900 | dec eax // eb0d | cmp dword ptr [eax + 0x18], 0x10 $sequence_6 = { 0903 e9???????? 488d05d8940500 0f100f 0f1006 f30f7f4dd0 f30f7f45e0 } // n = 7, score = 100 // 0903 | lea ecx, [0x460f9] // e9???????? | // 488d05d8940500 | dec eax // 0f100f | mov dword ptr [ebx], ecx // 0f1006 | dec eax // f30f7f4dd0 | lea edx, [ebx + 8] // f30f7f45e0 | xor ecx, ecx $sequence_7 = { 418d45ff 410fb68c8332b30800 410fb6b48333b30800 8bd9 } // n = 4, score = 100 // 418d45ff | dec eax // 410fb68c8332b30800 | lea eax, [0x3b0c7] // 410fb6b48333b30800 | dec eax // 8bd9 | mov ebx, ecx $sequence_8 = { 498b4e08 4c8d4508 33d2 ff15???????? 488b7508 4c8d4530 488bce } // n = 7, score = 100 // 498b4e08 | dec eax // 4c8d4508 | test ecx, ecx // 33d2 | je 0x1d4 // ff15???????? | // 488b7508 | dec esp // 4c8d4530 | lea eax, [0x41c6f] // 488bce | dec esp $sequence_9 = { 884dd8 488bd3 482bd7 48d1fa 4883fa0f 7426 41b001 } // n = 7, score = 100 // 884dd8 | dec eax // 488bd3 | add ebx, 0xa // 482bd7 | bts dword ptr [edi], 0x12 // 48d1fa | jmp 0x1024 // 4883fa0f | inc ecx // 7426 | mov eax, 8 // 41b001 | dec eax condition: 7 of them and filesize < 1552384 }
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