There is no description at this point.
rule win_chthonic_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.chthonic." 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.chthonic" 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 = { d3ee 83e601 8975fc eb00 85ff 0f84bd000000 4f } // n = 7, score = 600 // d3ee | shr esi, cl // 83e601 | and esi, 1 // 8975fc | mov dword ptr [ebp - 4], esi // eb00 | jmp 2 // 85ff | test edi, edi // 0f84bd000000 | je 0xc3 // 4f | dec edi $sequence_1 = { eb00 85f6 74cb 8b75f8 } // n = 4, score = 600 // eb00 | jmp 2 // 85f6 | test esi, esi // 74cb | je 0xffffffcd // 8b75f8 | mov esi, dword ptr [ebp - 8] $sequence_2 = { 83c703 013e 8b36 83c410 f60680 } // n = 5, score = 600 // 83c703 | add edi, 3 // 013e | add dword ptr [esi], edi // 8b36 | mov esi, dword ptr [esi] // 83c410 | add esp, 0x10 // f60680 | test byte ptr [esi], 0x80 $sequence_3 = { 8845ff 8d84bdfcfbffff 8b10 8911 } // n = 4, score = 600 // 8845ff | mov byte ptr [ebp - 1], al // 8d84bdfcfbffff | lea eax, [ebp + edi*4 - 0x404] // 8b10 | mov edx, dword ptr [eax] // 8911 | mov dword ptr [ecx], edx $sequence_4 = { 0301 03f8 81e7ff000080 7908 4f 81cf00ffffff } // n = 6, score = 600 // 0301 | add eax, dword ptr [ecx] // 03f8 | add edi, eax // 81e7ff000080 | and edi, 0x800000ff // 7908 | jns 0xa // 4f | dec edi // 81cf00ffffff | or edi, 0xffffff00 $sequence_5 = { 83e601 eb00 8b4df8 8d0c4e } // n = 4, score = 600 // 83e601 | and esi, 1 // eb00 | jmp 2 // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 8d0c4e | lea ecx, [esi + ecx*2] $sequence_6 = { 6a2a 58 ff7508 66894108 b8ecff0000 } // n = 5, score = 600 // 6a2a | push 0x2a // 58 | pop eax // ff7508 | push dword ptr [ebp + 8] // 66894108 | mov word ptr [ecx + 8], ax // b8ecff0000 | mov eax, 0xffec $sequence_7 = { d3ee 83e601 eb00 85f6 74cb 8b75f8 83fe02 } // n = 7, score = 600 // d3ee | shr esi, cl // 83e601 | and esi, 1 // eb00 | jmp 2 // 85f6 | test esi, esi // 74cb | je 0xffffffcd // 8b75f8 | mov esi, dword ptr [ebp - 8] // 83fe02 | cmp esi, 2 $sequence_8 = { 013e 8b36 83c410 f60680 7408 } // n = 5, score = 600 // 013e | add dword ptr [esi], edi // 8b36 | mov esi, dword ptr [esi] // 83c410 | add esp, 0x10 // f60680 | test byte ptr [esi], 0x80 // 7408 | je 0xa $sequence_9 = { 46 8908 3bf3 7cbc 33db 33f6 33ff } // n = 7, score = 600 // 46 | inc esi // 8908 | mov dword ptr [eax], ecx // 3bf3 | cmp esi, ebx // 7cbc | jl 0xffffffbe // 33db | xor ebx, ebx // 33f6 | xor esi, esi // 33ff | xor edi, edi condition: 7 of them and filesize < 425984 }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below.
Please propose all changes regarding references on the Malpedia library page
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY