Actor(s): Stone Panda
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rule win_anel_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" 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 = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 33ff 8db50cffffff e8???????? 6a01 8db5f0feffff e8???????? 6a01 } // n = 7, score = 200 // 33ff | xor edi, edi // 8db50cffffff | lea esi, [ebp - 0xf4] // e8???????? | // 6a01 | push 1 // 8db5f0feffff | lea esi, [ebp - 0x110] // e8???????? | // 6a01 | push 1 $sequence_1 = { 8b45d4 7303 8d45d4 8b4de4 50 8d852cffffff } // n = 6, score = 200 // 8b45d4 | mov eax, dword ptr [ebp - 0x2c] // 7303 | jae 5 // 8d45d4 | lea eax, [ebp - 0x2c] // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] // 50 | push eax // 8d852cffffff | lea eax, [ebp - 0xd4] $sequence_2 = { 0394b8480c0000 8b4dfc 334844 335040 8bc1 335508 c1e818 } // n = 7, score = 200 // 0394b8480c0000 | add edx, dword ptr [eax + edi*4 + 0xc48] // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 334844 | xor ecx, dword ptr [eax + 0x44] // 335040 | xor edx, dword ptr [eax + 0x40] // 8bc1 | mov eax, ecx // 335508 | xor edx, dword ptr [ebp + 8] // c1e818 | shr eax, 0x18 $sequence_3 = { e8???????? 8bd8 8b8504ffffff c645fc0b e8???????? 33db 43 } // n = 7, score = 200 // e8???????? | // 8bd8 | mov ebx, eax // 8b8504ffffff | mov eax, dword ptr [ebp - 0xfc] // c645fc0b | mov byte ptr [ebp - 4], 0xb // e8???????? | // 33db | xor ebx, ebx // 43 | inc ebx $sequence_4 = { 668945d6 6a69 58 6a6e 668945d8 58 6a67 } // n = 7, score = 200 // 668945d6 | mov word ptr [ebp - 0x2a], ax // 6a69 | push 0x69 // 58 | pop eax // 6a6e | push 0x6e // 668945d8 | mov word ptr [ebp - 0x28], ax // 58 | pop eax // 6a67 | push 0x67 $sequence_5 = { ffb5606ffeff ffd6 85c0 75c0 8d85646ffeff 50 ff95506ffeff } // n = 7, score = 200 // ffb5606ffeff | push dword ptr [ebp - 0x190a0] // ffd6 | call esi // 85c0 | test eax, eax // 75c0 | jne 0xffffffc2 // 8d85646ffeff | lea eax, [ebp - 0x1909c] // 50 | push eax // ff95506ffeff | call dword ptr [ebp - 0x190b0] $sequence_6 = { 6a00 8bc6 e8???????? 84c0 7439 837e1408 7204 } // n = 7, score = 200 // 6a00 | push 0 // 8bc6 | mov eax, esi // e8???????? | // 84c0 | test al, al // 7439 | je 0x3b // 837e1408 | cmp dword ptr [esi + 0x14], 8 // 7204 | jb 6 $sequence_7 = { c20800 68???????? e8???????? cc 6a50 b8???????? e8???????? } // n = 7, score = 200 // c20800 | ret 8 // 68???????? | // e8???????? | // cc | int3 // 6a50 | push 0x50 // b8???????? | // e8???????? | $sequence_8 = { 51 50 e8???????? 8b44244c 894604 } // n = 5, score = 200 // 51 | push ecx // 50 | push eax // e8???????? | // 8b44244c | mov eax, dword ptr [esp + 0x4c] // 894604 | mov dword ptr [esi + 4], eax $sequence_9 = { 0f8e89000000 8b7510 85f6 7e62 ff7514 8d45f8 57 } // n = 7, score = 200 // 0f8e89000000 | jle 0x8f // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 85f6 | test esi, esi // 7e62 | jle 0x64 // ff7514 | push dword ptr [ebp + 0x14] // 8d45f8 | lea eax, [ebp - 8] // 57 | push edi condition: 7 of them and filesize < 376832 }
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