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rule win_chainshot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.chainshot." 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.chainshot" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { bd01000000 c70703000000 ebe9 bd01000000 } // n = 4, score = 300 // bd01000000 | lea edx, [0xc6f3] // c70703000000 | dec eax // ebe9 | dec eax // bd01000000 | lea edx, [0x1df5] $sequence_1 = { 83e010 83c010 c3 85c9 7906 b804000000 } // n = 6, score = 300 // 83e010 | dec esp // 83c010 | mov ecx, dword ptr [esp + 0x28] // c3 | dec esp // 85c9 | mov edx, dword ptr [esp + 0x48] // 7906 | inc ecx // b804000000 | mov ebx, 0x100 $sequence_2 = { e9???????? bd01000000 c70706000000 e9???????? bd01000000 c70707000000 e9???????? } // n = 7, score = 300 // e9???????? | // bd01000000 | push eax // c70706000000 | mov ecx, dword ptr [ebp + 0xc] // e9???????? | // bd01000000 | mov ebx, dword ptr [ebp - 4] // c70707000000 | mov edx, edi // e9???????? | $sequence_3 = { ff15???????? 85c0 7527 b90a0b0080 eb05 b901000080 } // n = 6, score = 300 // ff15???????? | // 85c0 | push edi // 7527 | mov ecx, eax // b90a0b0080 | lea ecx, [ebp - 0xc] // eb05 | push ebx // b901000080 | push ecx $sequence_4 = { 8bd8 85c0 780b 837d3000 752c } // n = 5, score = 300 // 8bd8 | jne 0x67f // 85c0 | mov ecx, dword ptr [edi + ebp*8 + 0x148] // 780b | cmp eax, 0xa // 837d3000 | jae 0x891 // 752c | push edi $sequence_5 = { 0f8454020000 8d68fc c70726000000 e9???????? c70709000000 } // n = 5, score = 300 // 0f8454020000 | dec esp // 8d68fc | lea eax, [edi + 4] // c70726000000 | dec eax // e9???????? | // c70709000000 | lea edx, [ebp + 0x20] $sequence_6 = { 8ad8 84c0 7507 b900080080 eb64 } // n = 5, score = 300 // 8ad8 | lea eax, [0x1e7fd] // 84c0 | dec eax // 7507 | cmp ebx, eax // b900080080 | jne 0x76 // eb64 | dec eax $sequence_7 = { 6683f819 7705 8d4220 eb03 } // n = 4, score = 300 // 6683f819 | sub ecx, ecx // 7705 | inc ebp // 8d4220 | mov edx, ebx // eb03 | dec ecx $sequence_8 = { 83e819 0f8481000000 ffc8 7468 ffc8 744f } // n = 6, score = 300 // 83e819 | mov dword ptr [esp + 0x20], eax // 0f8481000000 | dec esp // ffc8 | mov esi, eax // 7468 | dec eax // ffc8 | mov dword ptr [ebp - 0x10], eax // 744f | dec esp $sequence_9 = { 83f818 0f8703020000 0f849b0c0000 83f80a 0f8757010000 } // n = 5, score = 300 // 83f818 | mov ebx, 0x2000 // 0f8703020000 | push edi // 0f849b0c0000 | dec eax // 83f80a | sub esp, 0x20 // 0f8757010000 | and dword ptr [esp + 0x50], 0 condition: 7 of them and filesize < 802816 }
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