Actor(s): Stone Panda
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rule win_anel_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.anel." 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.anel" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { ff15???????? 33db 43 53 33ff 8db5ecfeffff } // n = 6, score = 200 // ff15???????? | // 33db | xor ebx, ebx // 43 | inc ebx // 53 | push ebx // 33ff | xor edi, edi // 8db5ecfeffff | lea esi, [ebp - 0x114] $sequence_1 = { 8d7508 e8???????? 8bc3 e8???????? c21c00 6a3c b8???????? } // n = 7, score = 200 // 8d7508 | lea esi, [ebp + 8] // e8???????? | // 8bc3 | mov eax, ebx // e8???????? | // c21c00 | ret 0x1c // 6a3c | push 0x3c // b8???????? | $sequence_2 = { 8b00 50 ff15???????? 83e83c 99 8945a4 8d45a4 } // n = 7, score = 200 // 8b00 | mov eax, dword ptr [eax] // 50 | push eax // ff15???????? | // 83e83c | sub eax, 0x3c // 99 | cdq // 8945a4 | mov dword ptr [ebp - 0x5c], eax // 8d45a4 | lea eax, [ebp - 0x5c] $sequence_3 = { b8???????? e8???????? 8b7508 33db 895dfc 53 895df0 } // n = 7, score = 200 // b8???????? | // e8???????? | // 8b7508 | mov esi, dword ptr [ebp + 8] // 33db | xor ebx, ebx // 895dfc | mov dword ptr [ebp - 4], ebx // 53 | push ebx // 895df0 | mov dword ptr [ebp - 0x10], ebx $sequence_4 = { 8d45c4 89b51cfeffff c74590677a6970 c745942c206465 c74598666c6174 66c7459c6500 c7856cffffff41636365 } // n = 7, score = 200 // 8d45c4 | lea eax, [ebp - 0x3c] // 89b51cfeffff | mov dword ptr [ebp - 0x1e4], esi // c74590677a6970 | mov dword ptr [ebp - 0x70], 0x70697a67 // c745942c206465 | mov dword ptr [ebp - 0x6c], 0x6564202c // c74598666c6174 | mov dword ptr [ebp - 0x68], 0x74616c66 // 66c7459c6500 | mov word ptr [ebp - 0x64], 0x65 // c7856cffffff41636365 | mov dword ptr [ebp - 0x94], 0x65636341 $sequence_5 = { 7698 894e08 8b4df4 894e10 } // n = 4, score = 200 // 7698 | jbe 0xffffff9a // 894e08 | mov dword ptr [esi + 8], ecx // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 894e10 | mov dword ptr [esi + 0x10], ecx $sequence_6 = { ffb580feffff 8d7594 ffb57cfeffff c68593feffff01 e8???????? 59 } // n = 6, score = 200 // ffb580feffff | push dword ptr [ebp - 0x180] // 8d7594 | lea esi, [ebp - 0x6c] // ffb57cfeffff | push dword ptr [ebp - 0x184] // c68593feffff01 | mov byte ptr [ebp - 0x16d], 1 // e8???????? | // 59 | pop ecx $sequence_7 = { 58 6a4c 668945a6 58 6a45 668945a8 58 } // n = 7, score = 200 // 58 | pop eax // 6a4c | push 0x4c // 668945a6 | mov word ptr [ebp - 0x5a], ax // 58 | pop eax // 6a45 | push 0x45 // 668945a8 | mov word ptr [ebp - 0x58], ax // 58 | pop eax $sequence_8 = { 51 c645fc06 e8???????? 59 59 57 c645fc07 } // n = 7, score = 200 // 51 | push ecx // c645fc06 | mov byte ptr [ebp - 4], 6 // e8???????? | // 59 | pop ecx // 59 | pop ecx // 57 | push edi // c645fc07 | mov byte ptr [ebp - 4], 7 $sequence_9 = { 53 33ff 8db5c0feffff e8???????? 53 8db530ffffff e8???????? } // n = 7, score = 200 // 53 | push ebx // 33ff | xor edi, edi // 8db5c0feffff | lea esi, [ebp - 0x140] // e8???????? | // 53 | push ebx // 8db530ffffff | lea esi, [ebp - 0xd0] // e8???????? | condition: 7 of them and filesize < 376832 }
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