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rule win_allaple_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.allaple." 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.allaple" 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 = { c1f803 8b5510 880c02 8b45f8 25ff000000 8b8d20ffffff } // n = 6, score = 300 // c1f803 | sar eax, 3 // 8b5510 | mov edx, dword ptr [ebp + 0x10] // 880c02 | mov byte ptr [edx + eax], cl // 8b45f8 | mov eax, dword ptr [ebp - 8] // 25ff000000 | and eax, 0xff // 8b8d20ffffff | mov ecx, dword ptr [ebp - 0xe0] $sequence_1 = { 334510 5d c3 55 8bec 836508ff 8b4d0c } // n = 7, score = 300 // 334510 | xor eax, dword ptr [ebp + 0x10] // 5d | pop ebp // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 836508ff | and dword ptr [ebp + 8], 0xffffffff // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] $sequence_2 = { e8???????? 83c620 c60610 b818000000 034518 66894603 66c746050004 } // n = 7, score = 300 // e8???????? | // 83c620 | add esi, 0x20 // c60610 | mov byte ptr [esi], 0x10 // b818000000 | mov eax, 0x18 // 034518 | add eax, dword ptr [ebp + 0x18] // 66894603 | mov word ptr [esi + 3], ax // 66c746050004 | mov word ptr [esi + 5], 0x400 $sequence_3 = { ff750c 8d8500fcffff 50 e8???????? 8db790000000 56 53 } // n = 7, score = 300 // ff750c | push dword ptr [ebp + 0xc] // 8d8500fcffff | lea eax, [ebp - 0x400] // 50 | push eax // e8???????? | // 8db790000000 | lea esi, [edi + 0x90] // 56 | push esi // 53 | push ebx $sequence_4 = { 6a00 6a00 e8???????? 0bc0 0f84f7000000 83f8ff 0f84ee000000 } // n = 7, score = 300 // 6a00 | push 0 // 6a00 | push 0 // e8???????? | // 0bc0 | or eax, eax // 0f84f7000000 | je 0xfd // 83f8ff | cmp eax, -1 // 0f84ee000000 | je 0xf4 $sequence_5 = { 8b4356 66894618 56 53 e8???????? 83c620 c60610 } // n = 7, score = 300 // 8b4356 | mov eax, dword ptr [ebx + 0x56] // 66894618 | mov word ptr [esi + 0x18], ax // 56 | push esi // 53 | push ebx // e8???????? | // 83c620 | add esi, 0x20 // c60610 | mov byte ptr [esi], 0x10 $sequence_6 = { 8b4df0 034dec 034d8c 8b55e4 33d1 8955e4 8b45ec } // n = 7, score = 300 // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 034dec | add ecx, dword ptr [ebp - 0x14] // 034d8c | add ecx, dword ptr [ebp - 0x74] // 8b55e4 | mov edx, dword ptr [ebp - 0x1c] // 33d1 | xor edx, ecx // 8955e4 | mov dword ptr [ebp - 0x1c], edx // 8b45ec | mov eax, dword ptr [ebp - 0x14] $sequence_7 = { 7408 8985b4fdffff eb05 e9???????? 68???????? } // n = 5, score = 300 // 7408 | je 0xa // 8985b4fdffff | mov dword ptr [ebp - 0x24c], eax // eb05 | jmp 7 // e9???????? | // 68???????? | $sequence_8 = { 56 e8???????? 8975fc 83c604 c706ff534d42 c6460471 } // n = 6, score = 300 // 56 | push esi // e8???????? | // 8975fc | mov dword ptr [ebp - 4], esi // 83c604 | add esi, 4 // c706ff534d42 | mov dword ptr [esi], 0x424d53ff // c6460471 | mov byte ptr [esi + 4], 0x71 $sequence_9 = { 0fb74606 8945f8 81c6f8000000 8bde 83c328 eb2f 8b4e0c } // n = 7, score = 300 // 0fb74606 | movzx eax, word ptr [esi + 6] // 8945f8 | mov dword ptr [ebp - 8], eax // 81c6f8000000 | add esi, 0xf8 // 8bde | mov ebx, esi // 83c328 | add ebx, 0x28 // eb2f | jmp 0x31 // 8b4e0c | mov ecx, dword ptr [esi + 0xc] condition: 7 of them and filesize < 253952 }
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