Actor(s): FIN8
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rule win_poslurp_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.poslurp." 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.poslurp" 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 = { 0f87fd000000 668378203d 0f85f2000000 498bce } // n = 4, score = 100 // 0f87fd000000 | je 0xfa // 668378203d | mov ecx, eax // 0f85f2000000 | sub ecx, ebp // 498bce | add ecx, -0x24 $sequence_1 = { cc 33c9 ff15???????? cc 488bac2440010000 } // n = 5, score = 100 // cc | mov dword ptr [esp + 0x38], 1 // 33c9 | dec eax // ff15???????? | // cc | mov dword ptr [esp + 0x98], esi // 488bac2440010000 | dec eax $sequence_2 = { 488bf5 498bfc f3a4 498bcc e8???????? } // n = 5, score = 100 // 488bf5 | mov edi, ebx // 498bfc | jae 0x1b1 // f3a4 | inc ecx // 498bcc | mov ecx, 0x30 // e8???????? | $sequence_3 = { ff15???????? 4c8be8 4885c0 0f84c2000000 4863453c } // n = 5, score = 100 // ff15???????? | // 4c8be8 | dec eax // 4885c0 | mov ecx, edi // 0f84c2000000 | dec eax // 4863453c | mov ebp, dword ptr [esp + 0x140] $sequence_4 = { 488d15a9100000 41b93f000f00 4533c0 48c7c102000080 } // n = 4, score = 100 // 488d15a9100000 | jb 0x149 // 41b93f000f00 | dec eax // 4533c0 | add esp, 0x50 // 48c7c102000080 | pop edi $sequence_5 = { 418bc1 41ffc0 486bc022 4803c2 48ffc2 } // n = 5, score = 100 // 418bc1 | sub ecx, 0x11 // 41ffc0 | je 0x19e // 486bc022 | nop word ptr [eax + eax] // 4803c2 | movsx eax, byte ptr [esi] // 48ffc2 | sub edx, 1 $sequence_6 = { 0f8301010000 418bd6 498bcf 8bfb 412bd7 } // n = 5, score = 100 // 0f8301010000 | mov ecx, esi // 418bd6 | xor edx, edx // 498bcf | cmp word ptr [ebx + 0x38], 0x18 // 8bfb | je 0x157 // 412bd7 | nop dword ptr [eax] $sequence_7 = { 0f84ae000000 80393d 0f85a5000000 418bd6 } // n = 4, score = 100 // 0f84ae000000 | je 0xfffffc70 // 80393d | dec eax // 0f85a5000000 | lea edi, [esp + 0x20] // 418bd6 | dec eax $sequence_8 = { 418bc8 ffce 488bd5 2bcd 8bfb } // n = 5, score = 100 // 418bc8 | ja 0x199 // ffce | dec ebp // 488bd5 | test esp, esp // 2bcd | je 0x199 // 8bfb | cmp eax, 5 $sequence_9 = { 488bd8 4883f8ff 0f84c8010000 448b05???????? 4889ac24a0020000 4889b424a8020000 4889bc24b0020000 } // n = 7, score = 100 // 488bd8 | lea eax, [0xfffff90b] // 4883f8ff | dec eax // 0f84c8010000 | mov dword ptr [esp + 0x40], ecx // 448b05???????? | // 4889ac24a0020000 | dec eax // 4889b424a8020000 | mov dword ptr [esp + 0x38], ebx // 4889bc24b0020000 | dec eax condition: 7 of them and filesize < 50176 }
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