Actor(s): TA505
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rule win_get2_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.get2." 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.get2" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 83c8ff e9???????? 53 8b5d08 56 } // n = 5, score = 1000 // 83c8ff | or eax, 0xffffffff // e9???????? | // 53 | push ebx // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 56 | push esi $sequence_1 = { 83ec38 a1???????? 33c5 8945fc 8365c800 53 } // n = 6, score = 1000 // 83ec38 | sub esp, 0x38 // a1???????? | // 33c5 | xor eax, ebp // 8945fc | mov dword ptr [ebp - 4], eax // 8365c800 | and dword ptr [ebp - 0x38], 0 // 53 | push ebx $sequence_2 = { 8b4d0c 6a7d 894804 8b06 59 } // n = 5, score = 1000 // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 6a7d | push 0x7d // 894804 | mov dword ptr [eax + 4], ecx // 8b06 | mov eax, dword ptr [esi] // 59 | pop ecx $sequence_3 = { ff75ec 8bcb 897004 e8???????? 8b7508 897004 } // n = 6, score = 1000 // ff75ec | push dword ptr [ebp - 0x14] // 8bcb | mov ecx, ebx // 897004 | mov dword ptr [eax + 4], esi // e8???????? | // 8b7508 | mov esi, dword ptr [ebp + 8] // 897004 | mov dword ptr [eax + 4], esi $sequence_4 = { 78eb 53 8d5f04 83c604 50 } // n = 5, score = 1000 // 78eb | js 0xffffffed // 53 | push ebx // 8d5f04 | lea ebx, [edi + 4] // 83c604 | add esi, 4 // 50 | push eax $sequence_5 = { 74bf 6685c0 74ba 83f82e } // n = 4, score = 1000 // 74bf | je 0xffffffc1 // 6685c0 | test ax, ax // 74ba | je 0xffffffbc // 83f82e | cmp eax, 0x2e $sequence_6 = { 8bf1 8975d0 33ff 8975cc 897dd4 893e 897e04 } // n = 7, score = 1000 // 8bf1 | mov esi, ecx // 8975d0 | mov dword ptr [ebp - 0x30], esi // 33ff | xor edi, edi // 8975cc | mov dword ptr [ebp - 0x34], esi // 897dd4 | mov dword ptr [ebp - 0x2c], edi // 893e | mov dword ptr [esi], edi // 897e04 | mov dword ptr [esi + 4], edi $sequence_7 = { 59 8d4dec e8???????? 8b16 8bce 6a20 ff5230 } // n = 7, score = 1000 // 59 | pop ecx // 8d4dec | lea ecx, [ebp - 0x14] // e8???????? | // 8b16 | mov edx, dword ptr [esi] // 8bce | mov ecx, esi // 6a20 | push 0x20 // ff5230 | call dword ptr [edx + 0x30] $sequence_8 = { 488bf1 488b39 488b5708 e8???????? } // n = 4, score = 100 // 488bf1 | js 0x88 // 488b39 | dec eax // 488b5708 | cmp ebp, dword ptr [ebx + 0x10] // e8???????? | $sequence_9 = { 0fb708 6683f92a 7525 4883c002 488906 6683383f } // n = 6, score = 100 // 0fb708 | cmp esi, dword ptr [ebx + 0x10] // 6683f92a | jae 0x147 // 7525 | mov ecx, eax // 4883c002 | dec eax // 488906 | add edx, edx // 6683383f | test eax, eax $sequence_10 = { 33d2 4d8bc7 488bc8 e8???????? } // n = 4, score = 100 // 33d2 | mov esi, dword ptr [edi] // 4d8bc7 | jmp 0xa // 488bc8 | dec eax // e8???????? | $sequence_11 = { 4983fe08 7205 488b37 eb03 488bf7 498bd5 } // n = 6, score = 100 // 4983fe08 | dec eax // 7205 | lea eax, [esp + 0x1960] // 488b37 | dec ecx // eb03 | cmp esi, 8 // 488bf7 | jb 7 // 498bd5 | dec eax $sequence_12 = { 0f83450a0000 488b4628 4c892cc8 e9???????? 488b4e48 } // n = 5, score = 100 // 0f83450a0000 | jae 0x12c // 488b4628 | dec eax // 4c892cc8 | shl ebp, 4 // e9???????? | // 488b4e48 | dec eax $sequence_13 = { 488bd6 483b7310 0f8341010000 8bc8 4803d2 } // n = 5, score = 100 // 488bd6 | mov esi, edi // 483b7310 | dec ecx // 0f8341010000 | mov edx, ebp // 8bc8 | xor edx, edx // 4803d2 | dec ebp $sequence_14 = { 6683bc246019000000 7505 4c8bc6 eb1d 488d842460190000 } // n = 5, score = 100 // 6683bc246019000000 | cmp word ptr [esp + 0x1960], 0 // 7505 | jne 7 // 4c8bc6 | dec esp // eb1d | mov eax, esi // 488d842460190000 | jmp 0x1f $sequence_15 = { 85c0 0f8880000000 483b6b10 0f8322010000 48c1e504 48036b08 } // n = 6, score = 100 // 85c0 | mov eax, edi // 0f8880000000 | dec eax // 483b6b10 | mov ecx, eax // 0f8322010000 | dec eax // 48c1e504 | mov edx, esi // 48036b08 | dec eax condition: 7 of them and filesize < 720896 }
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