Actor(s): Pirate Panda
There is no description at this point.
rule win_chiser_client_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.chiser_client." 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.chiser_client" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 663905???????? 7511 0fb705???????? 663b4580 0f84a8000000 8b442450 8985a0010000 } // n = 7, score = 100 // 663905???????? | // 7511 | dec eax // 0fb705???????? | // 663b4580 | mov ecx, ebx // 0f84a8000000 | xor eax, eax // 8b442450 | dec eax // 8985a0010000 | add esp, 0x30 $sequence_1 = { e8???????? cc 488d4c2438 e8???????? 488d154c940100 488d4c2438 e8???????? } // n = 7, score = 100 // e8???????? | // cc | inc esp // 488d4c2438 | lea edi, dword ptr [eax + 0x6f] // e8???????? | // 488d154c940100 | inc esp // 488d4c2438 | lea esp, dword ptr [eax + 0x52] // e8???????? | $sequence_2 = { 0f1f4000 0fb701 6683f820 7406 6683f809 750a ffc7 } // n = 7, score = 100 // 0f1f4000 | mov edx, edi // 0fb701 | dec eax // 6683f820 | mov ecx, dword ptr [esi + 0x10] // 7406 | dec esp // 6683f809 | lea eax, dword ptr [0x3b4f7] // 750a | inc sp // ffc7 | mov dword ptr [esp + 0x6c], ebp $sequence_3 = { 488d0d3b1c0200 ff15???????? 488bc8 488d1533900200 488bd8 ff15???????? 488d153b900200 } // n = 7, score = 100 // 488d0d3b1c0200 | shr al, 4 // ff15???????? | // 488bc8 | inc esp // 488d1533900200 | movzx esi, byte ptr [esp + 0x58] // 488bd8 | dec eax // ff15???????? | // 488d153b900200 | cmp edi, 3 $sequence_4 = { e8???????? 85c0 740a b801000000 e9???????? 8bd5 488bcb } // n = 7, score = 100 // e8???????? | // 85c0 | mov byte ptr [edx + 0x1b], al // 740a | mov byte ptr [edx + 0x19], al // b801000000 | mov byte ptr [edx + 0x1a], al // e9???????? | // 8bd5 | mov byte ptr [edx + 0x1b], al // 488bcb | mov byte ptr [edx + 0x1c], al $sequence_5 = { 85c0 754d ff15???????? 83f87a 7542 8b4c2444 } // n = 6, score = 100 // 85c0 | test ecx, ecx // 754d | je 0xe8 // ff15???????? | // 83f87a | dec eax // 7542 | lea ecx, dword ptr [ebx + 0x50] // 8b4c2444 | sub edi, dword ptr [ebx + 0x50] $sequence_6 = { 448bc7 488bce ff15???????? 85c0 7412 8b7c2430 035c2434 } // n = 7, score = 100 // 448bc7 | dec esp // 488bce | mov dword ptr [esp + 0x10050], ebp // ff15???????? | // 85c0 | dec ecx // 7412 | or ebp, 0xffffffff // 8b7c2430 | test eax, eax // 035c2434 | je 0x6c0 $sequence_7 = { 488d05dec80100 488901 488bda c7411003000000 4883c118 e8???????? 488d4f60 } // n = 7, score = 100 // 488d05dec80100 | inc ebx // 488901 | mov byte ptr [edx + 2], cl // 488bda | inc ecx // c7411003000000 | movzx eax, dl // 4883c118 | inc esp // e8???????? | // 488d4f60 | movzx edx, byte ptr [eax + ecx + 0x100] $sequence_8 = { 483305???????? 488d156adf0200 488bcb 488905???????? } // n = 4, score = 100 // 483305???????? | // 488d156adf0200 | ja 0x172 // 488bcb | dec eax // 488905???????? | $sequence_9 = { 488bd8 ebdd 4533ff 418bdf 4c8d0d1232ffff } // n = 5, score = 100 // 488bd8 | test eax, eax // ebdd | jne 0x2fd // 4533ff | dec eax // 418bdf | lea eax, dword ptr [0x3da67] // 4c8d0d1232ffff | dec eax condition: 7 of them and filesize < 714752 }
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