Actor(s): APT32
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rule win_cuegoe_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.cuegoe." 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.cuegoe" 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 = { 894590 8b4514 8bf1 8bda 50 897588 } // n = 6, score = 200 // 894590 | mov dword ptr [ebp - 0x70], eax // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 8bf1 | mov esi, ecx // 8bda | mov ebx, edx // 50 | push eax // 897588 | mov dword ptr [ebp - 0x78], esi $sequence_1 = { 0fb703 33d2 c745c402000000 6685c0 7415 0fb7c8 } // n = 6, score = 200 // 0fb703 | movzx eax, word ptr [ebx] // 33d2 | xor edx, edx // c745c402000000 | mov dword ptr [ebp - 0x3c], 2 // 6685c0 | test ax, ax // 7415 | je 0x17 // 0fb7c8 | movzx ecx, ax $sequence_2 = { 6a01 8d4dd4 e8???????? 8bc6 e9???????? 8d45a8 e8???????? } // n = 7, score = 200 // 6a01 | push 1 // 8d4dd4 | lea ecx, [ebp - 0x2c] // e8???????? | // 8bc6 | mov eax, esi // e9???????? | // 8d45a8 | lea eax, [ebp - 0x58] // e8???????? | $sequence_3 = { 8b4604 fe8804c40310 8b4604 80b804c4031000 7f15 56 e8???????? } // n = 7, score = 200 // 8b4604 | mov eax, dword ptr [esi + 4] // fe8804c40310 | dec byte ptr [eax + 0x1003c404] // 8b4604 | mov eax, dword ptr [esi + 4] // 80b804c4031000 | cmp byte ptr [eax + 0x1003c404], 0 // 7f15 | jg 0x17 // 56 | push esi // e8???????? | $sequence_4 = { b8???????? e8???????? 8bf1 8b7d0c 8b460c 2b7d08 } // n = 6, score = 200 // b8???????? | // e8???????? | // 8bf1 | mov esi, ecx // 8b7d0c | mov edi, dword ptr [ebp + 0xc] // 8b460c | mov eax, dword ptr [esi + 0xc] // 2b7d08 | sub edi, dword ptr [ebp + 8] $sequence_5 = { 56 8d5c243c e8???????? 85c0 7522 8b44242c 8b5004 } // n = 7, score = 200 // 56 | push esi // 8d5c243c | lea ebx, [esp + 0x3c] // e8???????? | // 85c0 | test eax, eax // 7522 | jne 0x24 // 8b44242c | mov eax, dword ptr [esp + 0x2c] // 8b5004 | mov edx, dword ptr [eax + 4] $sequence_6 = { ff15???????? 53 6a01 8d7538 e8???????? eb21 c745185f250000 } // n = 7, score = 200 // ff15???????? | // 53 | push ebx // 6a01 | push 1 // 8d7538 | lea esi, [ebp + 0x38] // e8???????? | // eb21 | jmp 0x23 // c745185f250000 | mov dword ptr [ebp + 0x18], 0x255f $sequence_7 = { 0bc1 f644242001 668b4c2410 66890e 8b8d540c0000 8d340a 8b4c2410 } // n = 7, score = 200 // 0bc1 | or eax, ecx // f644242001 | test byte ptr [esp + 0x20], 1 // 668b4c2410 | mov cx, word ptr [esp + 0x10] // 66890e | mov word ptr [esi], cx // 8b8d540c0000 | mov ecx, dword ptr [ebp + 0xc54] // 8d340a | lea esi, [edx + ecx] // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] $sequence_8 = { 25c0010000 83f840 7430 3975e8 7626 8b07 8b4004 } // n = 7, score = 200 // 25c0010000 | and eax, 0x1c0 // 83f840 | cmp eax, 0x40 // 7430 | je 0x32 // 3975e8 | cmp dword ptr [ebp - 0x18], esi // 7626 | jbe 0x28 // 8b07 | mov eax, dword ptr [edi] // 8b4004 | mov eax, dword ptr [eax + 4] $sequence_9 = { 59 8d75bc e8???????? ff75bc e8???????? 59 397d14 } // n = 7, score = 200 // 59 | pop ecx // 8d75bc | lea esi, [ebp - 0x44] // e8???????? | // ff75bc | push dword ptr [ebp - 0x44] // e8???????? | // 59 | pop ecx // 397d14 | cmp dword ptr [ebp + 0x14], edi condition: 7 of them and filesize < 540672 }
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