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 = "2023-07-11" 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 = "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 = { f20f581d???????? f20f58c2 f20f59dc f20f58c3 81f902fcffff 488d15edcf0000 4c8d1de6d30000 } // n = 7, score = 100 // f20f581d???????? | // f20f58c2 | jmp 0x92d // f20f59dc | xor ebx, ebx // f20f58c3 | dec eax // 81f902fcffff | lea eax, [0x231ad] // 488d15edcf0000 | dec eax // 4c8d1de6d30000 | mov dword ptr [ebx], eax $sequence_1 = { 48894a08 488d4c2420 e8???????? 488d0546840200 488903 488bc3 4883c430 } // n = 7, score = 100 // 48894a08 | mov dword ptr [ebp - 0x21], eax // 488d4c2420 | dec eax // e8???????? | // 488d0546840200 | lea eax, [0x1e0cf] // 488903 | dec eax // 488bc3 | mov dword ptr [ebp - 0x29], eax // 4883c430 | dec eax $sequence_2 = { 488d9da0010000 bf0a000000 488bd3 488d4c2430 e8???????? 4883c302 4883ef01 } // n = 7, score = 100 // 488d9da0010000 | lea ecx, [ebp + 0x80] // bf0a000000 | int3 // 488bd3 | movzx edx, ax // 488d4c2430 | dec eax // e8???????? | // 4883c302 | lea ecx, [ebp + 0xa0] // 4883ef01 | dec eax $sequence_3 = { ff15???????? 488d0d189dfeff 483bc8 7433 41b804010000 488d542440 ff15???????? } // n = 7, score = 100 // ff15???????? | // 488d0d189dfeff | dec eax // 483bc8 | mov ecx, ebx // 7433 | dec eax // 41b804010000 | mov ecx, eax // 488d542440 | dec eax // ff15???????? | $sequence_4 = { 7506 4c877608 eb73 8364242800 488d056764feff 4889442430 } // n = 6, score = 100 // 7506 | jae 0x1951 // 4c877608 | dec eax // eb73 | add eax, eax // 8364242800 | dec eax // 488d056764feff | lea ecx, [0x27c46] // 4889442430 | mov eax, dword ptr [ecx + eax*8] $sequence_5 = { 81fa00000100 7708 33c0 4883c420 5b c3 } // n = 6, score = 100 // 81fa00000100 | lea eax, [0x3ca9c] // 7708 | mov dword ptr [ebx + 0x28], 0x4e0020 // 33c0 | mov edx, 0x50 // 4883c420 | mov dword ptr [ebx + 0x2c], 0x54 // 5b | dec eax // c3 | mov ecx, ebx $sequence_6 = { 488b09 4885c9 745c 488b4310 48baffffffffffffff1f 482bc1 } // n = 6, score = 100 // 488b09 | mov ebx, ecx // 4885c9 | dec eax // 745c | mov ecx, dword ptr [ebx + 0x30] // 488b4310 | dec eax // 48baffffffffffffff1f | test ecx, ecx // 482bc1 | dec eax $sequence_7 = { c70016000000 e8???????? eb13 8b05???????? 8901 0fb705???????? } // n = 6, score = 100 // c70016000000 | mov ecx, dword ptr [esp + 0x30] // e8???????? | // eb13 | or edx, 0xffffffff // 8b05???????? | // 8901 | inc esp // 0fb705???????? | $sequence_8 = { e8???????? cc 488d0436 483d00100000 } // n = 4, score = 100 // e8???????? | // cc | jne 0x17a // 488d0436 | test esi, esi // 483d00100000 | js 0x19f $sequence_9 = { 4c8d4d0f 4889442420 488bd9 e8???????? 85c0 740a } // n = 6, score = 100 // 4c8d4d0f | dec eax // 4889442420 | lea edx, [0x2aad2] // 488bd9 | dec eax // e8???????? | // 85c0 | mov ebx, eax // 740a | dec eax condition: 7 of them and filesize < 714752 }
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