Actor(s): RAZOR TIGER
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rule win_sidewinder_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.sidewinder." 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.sidewinder" 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 = { 68???????? ffb53cffffff ffb538ffffff e8???????? 8985bcfcffff eb07 83a5bcfcffff00 } // n = 7, score = 200 // 68???????? | // ffb53cffffff | push dword ptr [ebp - 0xc4] // ffb538ffffff | push dword ptr [ebp - 0xc8] // e8???????? | // 8985bcfcffff | mov dword ptr [ebp - 0x344], eax // eb07 | jmp 9 // 83a5bcfcffff00 | and dword ptr [ebp - 0x344], 0 $sequence_1 = { 6a64 ff7594 e8???????? 8985b8feffff e8???????? 33c0 83bdb8feffff00 } // n = 7, score = 200 // 6a64 | push 0x64 // ff7594 | push dword ptr [ebp - 0x6c] // e8???????? | // 8985b8feffff | mov dword ptr [ebp - 0x148], eax // e8???????? | // 33c0 | xor eax, eax // 83bdb8feffff00 | cmp dword ptr [ebp - 0x148], 0 $sequence_2 = { ff7044 6a01 e8???????? 8bc8 83c101 0f8080030000 e8???????? } // n = 7, score = 200 // ff7044 | push dword ptr [eax + 0x44] // 6a01 | push 1 // e8???????? | // 8bc8 | mov ecx, eax // 83c101 | add ecx, 1 // 0f8080030000 | jo 0x386 // e8???????? | $sequence_3 = { 83a518feffff00 e9???????? 8d45ec 50 8d8518ffffff 50 68???????? } // n = 7, score = 200 // 83a518feffff00 | and dword ptr [ebp - 0x1e8], 0 // e9???????? | // 8d45ec | lea eax, [ebp - 0x14] // 50 | push eax // 8d8518ffffff | lea eax, [ebp - 0xe8] // 50 | push eax // 68???????? | $sequence_4 = { 56 57 8965ec c745f0682b4000 c745f400000000 c745f800000000 8b5508 } // n = 7, score = 200 // 56 | push esi // 57 | push edi // 8965ec | mov dword ptr [ebp - 0x14], esp // c745f0682b4000 | mov dword ptr [ebp - 0x10], 0x402b68 // c745f400000000 | mov dword ptr [ebp - 0xc], 0 // c745f800000000 | mov dword ptr [ebp - 8], 0 // 8b5508 | mov edx, dword ptr [ebp + 8] $sequence_5 = { 8945e0 ff75d8 e8???????? 8945cc e8???????? 8b45cc 8945d4 } // n = 7, score = 200 // 8945e0 | mov dword ptr [ebp - 0x20], eax // ff75d8 | push dword ptr [ebp - 0x28] // e8???????? | // 8945cc | mov dword ptr [ebp - 0x34], eax // e8???????? | // 8b45cc | mov eax, dword ptr [ebp - 0x34] // 8945d4 | mov dword ptr [ebp - 0x2c], eax $sequence_6 = { 50 6a00 e8???????? 8d45d4 50 6a00 e8???????? } // n = 7, score = 200 // 50 | push eax // 6a00 | push 0 // e8???????? | // 8d45d4 | lea eax, [ebp - 0x2c] // 50 | push eax // 6a00 | push 0 // e8???????? | $sequence_7 = { e8???????? 8d45c8 898568ffffff c78560ffffff08400000 6a00 8d8560ffffff 50 } // n = 7, score = 200 // e8???????? | // 8d45c8 | lea eax, [ebp - 0x38] // 898568ffffff | mov dword ptr [ebp - 0x98], eax // c78560ffffff08400000 | mov dword ptr [ebp - 0xa0], 0x4008 // 6a00 | push 0 // 8d8560ffffff | lea eax, [ebp - 0xa0] // 50 | push eax $sequence_8 = { 50 e8???????? 8d45d0 50 e8???????? 8d4dcc e8???????? } // n = 7, score = 200 // 50 | push eax // e8???????? | // 8d45d0 | lea eax, [ebp - 0x30] // 50 | push eax // e8???????? | // 8d4dcc | lea ecx, [ebp - 0x34] // e8???????? | $sequence_9 = { 0fbfc0 85c0 740b 66c745cc0800 e9???????? c74590a88b4000 c7458808800000 } // n = 7, score = 200 // 0fbfc0 | movsx eax, ax // 85c0 | test eax, eax // 740b | je 0xd // 66c745cc0800 | mov word ptr [ebp - 0x34], 8 // e9???????? | // c74590a88b4000 | mov dword ptr [ebp - 0x70], 0x408ba8 // c7458808800000 | mov dword ptr [ebp - 0x78], 0x8008 condition: 7 of them and filesize < 679936 }
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