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rule win_jackpos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.jackpos." 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.jackpos" 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 = { 8b5604 eb03 8d5604 2bc7 03c0 50 } // n = 6, score = 100 // 8b5604 | mov edx, dword ptr [esi + 4] // eb03 | jmp 5 // 8d5604 | lea edx, [esi + 4] // 2bc7 | sub eax, edi // 03c0 | add eax, eax // 50 | push eax $sequence_1 = { d1f8 03d0 eb0f 85c0 } // n = 4, score = 100 // d1f8 | sar eax, 1 // 03d0 | add edx, eax // eb0f | jmp 0x11 // 85c0 | test eax, eax $sequence_2 = { 75ed 837df408 8b4dfc 7202 } // n = 4, score = 100 // 75ed | jne 0xffffffef // 837df408 | cmp dword ptr [ebp - 0xc], 8 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 7202 | jb 4 $sequence_3 = { 8b4508 e8???????? 8b7d08 8b550c 8b4718 3b7d10 747e } // n = 7, score = 100 // 8b4508 | mov eax, dword ptr [ebp + 8] // e8???????? | // 8b7d08 | mov edi, dword ptr [ebp + 8] // 8b550c | mov edx, dword ptr [ebp + 0xc] // 8b4718 | mov eax, dword ptr [edi + 0x18] // 3b7d10 | cmp edi, dword ptr [ebp + 0x10] // 747e | je 0x80 $sequence_4 = { 52 8bf0 53 897588 e8???????? } // n = 5, score = 100 // 52 | push edx // 8bf0 | mov esi, eax // 53 | push ebx // 897588 | mov dword ptr [ebp - 0x78], esi // e8???????? | $sequence_5 = { 7303 8d45d8 8d4dac 51 50 e8???????? 8b55b4 } // n = 7, score = 100 // 7303 | jae 5 // 8d45d8 | lea eax, [ebp - 0x28] // 8d4dac | lea ecx, [ebp - 0x54] // 51 | push ecx // 50 | push eax // e8???????? | // 8b55b4 | mov edx, dword ptr [ebp - 0x4c] $sequence_6 = { 85ff 7f87 5f 8bc6 5e 5b } // n = 6, score = 100 // 85ff | test edi, edi // 7f87 | jg 0xffffff89 // 5f | pop edi // 8bc6 | mov eax, esi // 5e | pop esi // 5b | pop ebx $sequence_7 = { 8b4604 33c9 66890c03 5f 8bc6 } // n = 5, score = 100 // 8b4604 | mov eax, dword ptr [esi + 4] // 33c9 | xor ecx, ecx // 66890c03 | mov word ptr [ebx + eax], cx // 5f | pop edi // 8bc6 | mov eax, esi $sequence_8 = { 765a 8b4a14 57 3bc1 734e 2bc8 8bf9 } // n = 7, score = 100 // 765a | jbe 0x5c // 8b4a14 | mov ecx, dword ptr [edx + 0x14] // 57 | push edi // 3bc1 | cmp eax, ecx // 734e | jae 0x50 // 2bc8 | sub ecx, eax // 8bf9 | mov edi, ecx $sequence_9 = { 037214 ebc4 5f 5e 5d } // n = 5, score = 100 // 037214 | add esi, dword ptr [edx + 0x14] // ebc4 | jmp 0xffffffc6 // 5f | pop edi // 5e | pop esi // 5d | pop ebp condition: 7 of them and filesize < 319488 }
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