Actor(s): Stone Panda
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rule win_anel_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { f7fe 43 3bd8 7621 8bd0 d1ea be91cfba01 } // n = 7, score = 200 // f7fe | idiv esi // 43 | inc ebx // 3bd8 | cmp ebx, eax // 7621 | jbe 0x23 // 8bd0 | mov edx, eax // d1ea | shr edx, 1 // be91cfba01 | mov esi, 0x1bacf91 $sequence_1 = { eb24 8bca 83e910 3b5904 7f17 7c07 } // n = 6, score = 200 // eb24 | jmp 0x26 // 8bca | mov ecx, edx // 83e910 | sub ecx, 0x10 // 3b5904 | cmp ebx, dword ptr [ecx + 4] // 7f17 | jg 0x19 // 7c07 | jl 9 $sequence_2 = { 8bf9 2bf8 85c0 7411 eb03 83c010 3bc1 } // n = 7, score = 200 // 8bf9 | mov edi, ecx // 2bf8 | sub edi, eax // 85c0 | test eax, eax // 7411 | je 0x13 // eb03 | jmp 5 // 83c010 | add eax, 0x10 // 3bc1 | cmp eax, ecx $sequence_3 = { c645fc06 e8???????? c645fc07 8bc8 c645fc08 e8???????? 8bc6 } // n = 7, score = 200 // c645fc06 | mov byte ptr [ebp - 4], 6 // e8???????? | // c645fc07 | mov byte ptr [ebp - 4], 7 // 8bc8 | mov ecx, eax // c645fc08 | mov byte ptr [ebp - 4], 8 // e8???????? | // 8bc6 | mov eax, esi $sequence_4 = { 897814 895810 89458c 8818 8d4678 } // n = 5, score = 200 // 897814 | mov dword ptr [eax + 0x14], edi // 895810 | mov dword ptr [eax + 0x10], ebx // 89458c | mov dword ptr [ebp - 0x74], eax // 8818 | mov byte ptr [eax], bl // 8d4678 | lea eax, [esi + 0x78] $sequence_5 = { c1e704 037d08 a5 a5 a5 a5 5f } // n = 7, score = 200 // c1e704 | shl edi, 4 // 037d08 | add edi, dword ptr [ebp + 8] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // 5f | pop edi $sequence_6 = { 53 33ff c645fc00 e8???????? 837d1c08 8b4508 7303 } // n = 7, score = 200 // 53 | push ebx // 33ff | xor edi, edi // c645fc00 | mov byte ptr [ebp - 4], 0 // e8???????? | // 837d1c08 | cmp dword ptr [ebp + 0x1c], 8 // 8b4508 | mov eax, dword ptr [ebp + 8] // 7303 | jae 5 $sequence_7 = { 8bec 51 56 8bf0 33c0 894610 c746140f000000 } // n = 7, score = 200 // 8bec | mov ebp, esp // 51 | push ecx // 56 | push esi // 8bf0 | mov esi, eax // 33c0 | xor eax, eax // 894610 | mov dword ptr [esi + 0x10], eax // c746140f000000 | mov dword ptr [esi + 0x14], 0xf $sequence_8 = { 8d8bd0000000 50 8d55d8 c645fc01 e8???????? 6a01 33ff } // n = 7, score = 200 // 8d8bd0000000 | lea ecx, [ebx + 0xd0] // 50 | push eax // 8d55d8 | lea edx, [ebp - 0x28] // c645fc01 | mov byte ptr [ebp - 4], 1 // e8???????? | // 6a01 | push 1 // 33ff | xor edi, edi $sequence_9 = { e8???????? 8bd6 8d8dc8feffff c645fc01 e8???????? c645fc02 83bd04ffffff05 } // n = 7, score = 200 // e8???????? | // 8bd6 | mov edx, esi // 8d8dc8feffff | lea ecx, [ebp - 0x138] // c645fc01 | mov byte ptr [ebp - 4], 1 // e8???????? | // c645fc02 | mov byte ptr [ebp - 4], 2 // 83bd04ffffff05 | cmp dword ptr [ebp - 0xfc], 5 condition: 7 of them and filesize < 376832 }
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