Actor(s): Silent Chollima
There is no description at this point.
rule win_collection_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.collection_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.collection_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 = { 488b5567 488d4ef0 4803cf 458bc6 e8???????? 85c0 } // n = 6, score = 100 // 488b5567 | mov eax, dword ptr [esp + 0xb8] // 488d4ef0 | xor edx, edx // 4803cf | dec eax // 458bc6 | mov dword ptr [esp + 0xb8], edi // e8???????? | // 85c0 | dec ecx $sequence_1 = { 488d05870c0100 488bd9 488901 f6c201 740a ba18000000 e8???????? } // n = 7, score = 100 // 488d05870c0100 | inc ebx // 488bd9 | movzx ecx, ax // 488901 | mov word ptr [edi + 4], ax // f6c201 | dec eax // 740a | cmp edx, ecx // ba18000000 | jb 0x1ef // e8???????? | $sequence_2 = { 488b4138 8938 e9???????? 488b05???????? 488b4808 488b4130 } // n = 6, score = 100 // 488b4138 | mov esi, dword ptr [ebx + 0x38] // 8938 | dec ecx // e9???????? | // 488b05???????? | // 488b4808 | mov esp, ebx // 488b4130 | xor al, al $sequence_3 = { 4883c102 33d2 e8???????? 488b0d???????? 488b5108 48894218 488b05???????? } // n = 7, score = 100 // 4883c102 | xor edx, edx // 33d2 | shr ecx, 5 // e8???????? | // 488b0d???????? | // 488b5108 | mov eax, 0x51eb851f // 48894218 | mul edi // 488b05???????? | $sequence_4 = { 0f8467010000 488bc4 48895808 48897010 48897818 4c897020 55 } // n = 7, score = 100 // 0f8467010000 | mov edi, ecx // 488bc4 | dec eax // 48895808 | lea edx, [0xdb42] // 48897010 | push edi // 48897818 | dec eax // 4c897020 | sub esp, 0x20 // 55 | dec eax $sequence_5 = { 458bf0 0fb7f2 4885c9 0f84d1000000 488b9c24a8000000 4885db } // n = 6, score = 100 // 458bf0 | dec eax // 0fb7f2 | lea ecx, [esp + 0x30] // 4885c9 | dec esp // 0f84d1000000 | mov eax, eax // 488b9c24a8000000 | mov dword ptr [esp + 0x20], edi // 4885db | inc esp $sequence_6 = { 83a424b000000000 ba14000000 33c9 448d42fa e8???????? 488d0d74740200 ffd0 } // n = 7, score = 100 // 83a424b000000000 | add dl, dl // ba14000000 | movzx eax, al // 33c9 | inc ebp // 448d42fa | mov bl, byte ptr [esi - 2] // e8???????? | // 488d0d74740200 | inc ebp // ffd0 | mov al, byte ptr [esi - 1] $sequence_7 = { e8???????? 482be0 bd00100000 488d8c24e0000000 448bc5 33d2 } // n = 6, score = 100 // e8???????? | // 482be0 | dec eax // bd00100000 | mov edi, ecx // 488d8c24e0000000 | dec eax // 448bc5 | test ecx, ecx // 33d2 | je 0x139b $sequence_8 = { 488b4a28 e8???????? 84c0 740b 488bd6 498bcd } // n = 6, score = 100 // 488b4a28 | inc esp // e8???????? | // 84c0 | mov eax, esi // 740b | mov edx, edi // 488bd6 | xor ecx, ecx // 498bcd | inc ebp $sequence_9 = { 488b4830 4c89542450 bf03000000 897c2448 488d442468 4889442440 488d8424d0000000 } // n = 7, score = 100 // 488b4830 | lea eax, [ebp - 0x29] // 4c89542450 | dec eax // bf03000000 | mov dword ptr [esp + 0x20], eax // 897c2448 | lea edx, [edi - 0x10] // 488d442468 | dec eax // 4889442440 | lea ecx, [ebx + 2] // 488d8424d0000000 | xor edx, edx condition: 7 of them and filesize < 397312 }
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