Actor(s): FIN8
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rule win_poslurp_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { ba00000040 c744242802000000 c744242004000000 ff15???????? 4883f8ff 7409 488bc8 } // n = 7, score = 100 // ba00000040 | cmp byte ptr [eax + 0x10], 0x3d // c744242802000000 | mov ecx, ebx // c744242004000000 | sub edx, 1 // ff15???????? | // 4883f8ff | je 0xc7e // 7409 | nop dword ptr [eax + eax] // 488bc8 | inc ecx $sequence_1 = { 4c8bc6 33d2 ff15???????? 488b5c2450 488b6c2460 488b742468 } // n = 6, score = 100 // 4c8bc6 | dec ebp // 33d2 | test esp, esp // ff15???????? | // 488b5c2450 | je 0x1190 // 488b6c2460 | lea eax, [edx - 0xf] // 488b742468 | cmp eax, 5 $sequence_2 = { 0f87fd000000 668378203d 0f85f2000000 498bce 33d2 488d5822 482bc8 } // n = 7, score = 100 // 0f87fd000000 | add esi, ecx // 668378203d | dec esp // 0f85f2000000 | mov ebp, ecx // 498bce | xor ebx, ebx // 33d2 | inc esp // 488d5822 | lea eax, [edi + 2] // 482bc8 | mov edx, 0x40000000 $sequence_3 = { c744242802000000 c744242004000000 ff15???????? 4883f8ff } // n = 4, score = 100 // c744242802000000 | dec esp // c744242004000000 | mov esp, dword ptr [esp + 0x2b8] // ff15???????? | // 4883f8ff | dec eax $sequence_4 = { 75ea 8d42f1 83f80f 0f878e000000 4885f6 0f8485000000 493bef } // n = 7, score = 100 // 75ea | lea ecx, [esp + 0x90] // 8d42f1 | dec eax // 83f80f | lea eax, [0xfffff90b] // 0f878e000000 | dec eax // 4885f6 | mov dword ptr [esp + 0x40], ecx // 0f8485000000 | dec eax // 493bef | mov dword ptr [esp + 0x38], ebx $sequence_5 = { 740e 0f1f4000 488b1b 66837b3818 } // n = 4, score = 100 // 740e | mov edi, eax // 0f1f4000 | dec eax // 488b1b | test eax, eax // 66837b3818 | je 0x551 $sequence_6 = { 4903cd e8???????? 448b0d???????? 8903 ffc6 } // n = 5, score = 100 // 4903cd | repne scasd eax, dword ptr es:[edi] // e8???????? | // 448b0d???????? | // 8903 | xor eax, eax // ffc6 | dec eax $sequence_7 = { 443bdd 7309 33c9 ff15???????? } // n = 4, score = 100 // 443bdd | mov esp, edx // 7309 | dec esp // 33c9 | mov ebp, ecx // ff15???????? | $sequence_8 = { 33d2 488bcb ff15???????? 498bcd ff15???????? 498bcc } // n = 6, score = 100 // 33d2 | dec eax // 488bcb | mov ecx, ebx // ff15???????? | // 498bcd | mov dword ptr [esp + 0x40], 0x238 // ff15???????? | // 498bcc | test eax, eax $sequence_9 = { 4885ed 0f8461fdffff 488d7c2438 488bf5 b920000000 f3a4 488d4d02 } // n = 7, score = 100 // 4885ed | inc ecx // 0f8461fdffff | mov ebx, ebp // 488d7c2438 | jbe 0xe75 // 488bf5 | nop dword ptr [eax] // b920000000 | dec eax // f3a4 | mov ecx, ebx // 488d4d02 | dec eax condition: 7 of them and filesize < 50176 }
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