Actor(s): FIN8
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rule win_poslurp_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 8b1d???????? 488d4c2430 2b1d???????? ff15???????? 488d542458 488d4c2430 ff15???????? } // n = 7, score = 100 // 8b1d???????? | // 488d4c2430 | test ecx, ecx // 2b1d???????? | // ff15???????? | // 488d542458 | jne 0x1e01 // 488d4c2430 | mov ecx, dword ptr [esi + 0x10] // ff15???????? | $sequence_1 = { 8905???????? 3b05???????? 7312 33c9 ff15???????? cc 33c9 } // n = 7, score = 100 // 8905???????? | // 3b05???????? | // 7312 | mov eax, ebp // 33c9 | test eax, eax // ff15???????? | // cc | je 0x1cbe // 33c9 | dec ecx $sequence_2 = { 488b7c2468 85c0 751d 488b4c2460 } // n = 4, score = 100 // 488b7c2468 | inc ebp // 85c0 | xor ecx, ecx // 751d | xor edx, edx // 488b4c2460 | dec eax $sequence_3 = { ff15???????? cc 4883c9ff 418bc2 } // n = 4, score = 100 // ff15???????? | // cc | dec esp // 4883c9ff | mov esi, dword ptr [esp + 0x90] // 418bc2 | dec ebp $sequence_4 = { 4c8d842490000000 4533c9 f3a4 488d4c2450 498bd6 48894c2430 498bcc } // n = 7, score = 100 // 4c8d842490000000 | mov ecx, edi // 4533c9 | dec ebp // f3a4 | cmp edi, esi // 488d4c2450 | jb 0x7bd // 498bd6 | dec esp // 48894c2430 | lea ebx, [esp + 0x60] // 498bcc | dec ecx $sequence_5 = { 6689445420 41ffc0 48ffc2 4883c9ff } // n = 4, score = 100 // 6689445420 | cmp eax, -1 // 41ffc0 | je 0x228 // 48ffc2 | dec eax // 4883c9ff | mov ebx, eax $sequence_6 = { ff15???????? 4883f830 0f85b3000000 817c245000100000 } // n = 4, score = 100 // ff15???????? | // 4883f830 | lea ecx, [esp + 0x50] // 0f85b3000000 | dec esp // 817c245000100000 | lea ecx, [esp + 0x88] $sequence_7 = { c640eb04 458d5807 c640ec05 c640ed07 c640ee08 c640ef0a c640f00b } // n = 7, score = 100 // c640eb04 | lea eax, [edi - 0xf] // 458d5807 | cmp eax, 5 // c640ec05 | ja 0x567 // c640ed07 | dec eax // c640ee08 | test edx, edx // c640ef0a | je 0x567 // c640f00b | cmp word ptr [edx], 0x3d $sequence_8 = { baeeeac01f 488bcb 4c8bf0 e8???????? 837e1000 } // n = 5, score = 100 // baeeeac01f | dec eax // 488bcb | mov ecx, edi // 4c8bf0 | dec eax // e8???????? | // 837e1000 | mov dword ptr [esp + 0x28], ebx $sequence_9 = { 66897c2460 6644894c2462 66895c2464 ff15???????? 488bf0 4885c0 0f84c0000000 } // n = 7, score = 100 // 66897c2460 | mov edx, 0x74 // 6644894c2462 | mov eax, 0x2d // 66895c2464 | mov word ptr [esp + 0x50], ax // ff15???????? | // 488bf0 | mov eax, 0x6b // 4885c0 | xor ebx, ebx // 0f84c0000000 | mov word ptr [esp + edx*2 + 0x20], ax condition: 7 of them and filesize < 50176 }
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