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rule win_lightbunny_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.lightbunny." 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.lightbunny" 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 = { 90 8b45e4 6a00 56 } // n = 4, score = 100 // 90 | nop // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 6a00 | push 0 // 56 | push esi $sequence_1 = { 3bc8 7532 68???????? e8???????? } // n = 4, score = 100 // 3bc8 | cmp ecx, eax // 7532 | jne 0x34 // 68???????? | // e8???????? | $sequence_2 = { c7861c10000000000000 81c624100000 81fe???????? 0f8c0effffff 5f 5e b801000000 } // n = 7, score = 100 // c7861c10000000000000 | mov dword ptr [esi + 0x101c], 0 // 81c624100000 | add esi, 0x1024 // 81fe???????? | // 0f8c0effffff | jl 0xffffff14 // 5f | pop edi // 5e | pop esi // b801000000 | mov eax, 1 $sequence_3 = { 83c404 8bf8 0fb7460c 50 ff7608 } // n = 5, score = 100 // 83c404 | add esp, 4 // 8bf8 | mov edi, eax // 0fb7460c | movzx eax, word ptr [esi + 0xc] // 50 | push eax // ff7608 | push dword ptr [esi + 8] $sequence_4 = { 741e 0524100000 41 3d???????? 7cef 5f } // n = 6, score = 100 // 741e | je 0x20 // 0524100000 | add eax, 0x1024 // 41 | inc ecx // 3d???????? | // 7cef | jl 0xfffffff1 // 5f | pop edi $sequence_5 = { 33c5 8945fc 56 8bf1 8d95fcfeffff } // n = 5, score = 100 // 33c5 | xor eax, ebp // 8945fc | mov dword ptr [ebp - 4], eax // 56 | push esi // 8bf1 | mov esi, ecx // 8d95fcfeffff | lea edx, [ebp - 0x104] $sequence_6 = { 85db 7507 c746349c3a4100 57 ff7634 } // n = 5, score = 100 // 85db | test ebx, ebx // 7507 | jne 9 // c746349c3a4100 | mov dword ptr [esi + 0x34], 0x413a9c // 57 | push edi // ff7634 | push dword ptr [esi + 0x34] $sequence_7 = { 0f85d2000000 80bdfdfeffff01 0f85c5000000 8b85fffeffff 57 } // n = 5, score = 100 // 0f85d2000000 | jne 0xd8 // 80bdfdfeffff01 | cmp byte ptr [ebp - 0x103], 1 // 0f85c5000000 | jne 0xcb // 8b85fffeffff | mov eax, dword ptr [ebp - 0x101] // 57 | push edi $sequence_8 = { 81fe???????? 0f8c0effffff 5f 5e } // n = 4, score = 100 // 81fe???????? | // 0f8c0effffff | jl 0xffffff14 // 5f | pop edi // 5e | pop esi $sequence_9 = { 8b148520ae4100 8a4c1a2d f6c104 7419 8a441a2e 80e1fb } // n = 6, score = 100 // 8b148520ae4100 | mov edx, dword ptr [eax*4 + 0x41ae20] // 8a4c1a2d | mov cl, byte ptr [edx + ebx + 0x2d] // f6c104 | test cl, 4 // 7419 | je 0x1b // 8a441a2e | mov al, byte ptr [edx + ebx + 0x2e] // 80e1fb | and cl, 0xfb condition: 7 of them and filesize < 2376704 }
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