Actor(s): RAZOR TIGER
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rule win_sidewinder_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { ff751c 8b45d8 8b00 ff75d8 ff5020 dbe2 8945d4 } // n = 7, score = 200 // ff751c | push dword ptr [ebp + 0x1c] // 8b45d8 | mov eax, dword ptr [ebp - 0x28] // 8b00 | mov eax, dword ptr [eax] // ff75d8 | push dword ptr [ebp - 0x28] // ff5020 | call dword ptr [eax + 0x20] // dbe2 | fnclex // 8945d4 | mov dword ptr [ebp - 0x2c], eax $sequence_1 = { 68???????? ff75c4 ff75c0 e8???????? 89856cffffff eb07 83a56cffffff00 } // n = 7, score = 200 // 68???????? | // ff75c4 | push dword ptr [ebp - 0x3c] // ff75c0 | push dword ptr [ebp - 0x40] // e8???????? | // 89856cffffff | mov dword ptr [ebp - 0x94], eax // eb07 | jmp 9 // 83a56cffffff00 | and dword ptr [ebp - 0x94], 0 $sequence_2 = { e8???????? c745fc0b000000 8d4598 50 e8???????? e8???????? c745fc0c000000 } // n = 7, score = 200 // e8???????? | // c745fc0b000000 | mov dword ptr [ebp - 4], 0xb // 8d4598 | lea eax, [ebp - 0x68] // 50 | push eax // e8???????? | // e8???????? | // c745fc0c000000 | mov dword ptr [ebp - 4], 0xc $sequence_3 = { ff7598 e8???????? 898574ffffff eb07 83a574ffffff00 8d4dd0 e8???????? } // n = 7, score = 200 // ff7598 | push dword ptr [ebp - 0x68] // e8???????? | // 898574ffffff | mov dword ptr [ebp - 0x8c], eax // eb07 | jmp 9 // 83a574ffffff00 | and dword ptr [ebp - 0x8c], 0 // 8d4dd0 | lea ecx, [ebp - 0x30] // e8???????? | $sequence_4 = { c745fc03000000 6a00 6a1f 6a01 6a11 8d45bc 50 } // n = 7, score = 200 // c745fc03000000 | mov dword ptr [ebp - 4], 3 // 6a00 | push 0 // 6a1f | push 0x1f // 6a01 | push 1 // 6a11 | push 0x11 // 8d45bc | lea eax, [ebp - 0x44] // 50 | push eax $sequence_5 = { 03c8 0f8097010000 81e1ff000000 8b4508 894874 8b4508 8b4070 } // n = 7, score = 200 // 03c8 | add ecx, eax // 0f8097010000 | jo 0x19d // 81e1ff000000 | and ecx, 0xff // 8b4508 | mov eax, dword ptr [ebp + 8] // 894874 | mov dword ptr [eax + 0x74], ecx // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b4070 | mov eax, dword ptr [eax + 0x70] $sequence_6 = { 837db800 0f8e25010000 8d45b8 50 8d45e0 50 8b45e8 } // n = 7, score = 200 // 837db800 | cmp dword ptr [ebp - 0x48], 0 // 0f8e25010000 | jle 0x12b // 8d45b8 | lea eax, [ebp - 0x48] // 50 | push eax // 8d45e0 | lea eax, [ebp - 0x20] // 50 | push eax // 8b45e8 | mov eax, dword ptr [ebp - 0x18] $sequence_7 = { 68???????? ff75d8 ff75d4 e8???????? 8945a8 eb04 } // n = 6, score = 200 // 68???????? | // ff75d8 | push dword ptr [ebp - 0x28] // ff75d4 | push dword ptr [ebp - 0x2c] // e8???????? | // 8945a8 | mov dword ptr [ebp - 0x58], eax // eb04 | jmp 6 $sequence_8 = { 6a44 68???????? ffb53cffffff ffb538ffffff e8???????? 898580fdffff eb07 } // n = 7, score = 200 // 6a44 | push 0x44 // 68???????? | // ffb53cffffff | push dword ptr [ebp - 0xc4] // ffb538ffffff | push dword ptr [ebp - 0xc8] // e8???????? | // 898580fdffff | mov dword ptr [ebp - 0x280], eax // eb07 | jmp 9 $sequence_9 = { ff751c 8b8518ffffff 8b00 ffb518ffffff ff5024 dbe2 898514ffffff } // n = 7, score = 200 // ff751c | push dword ptr [ebp + 0x1c] // 8b8518ffffff | mov eax, dword ptr [ebp - 0xe8] // 8b00 | mov eax, dword ptr [eax] // ffb518ffffff | push dword ptr [ebp - 0xe8] // ff5024 | call dword ptr [eax + 0x24] // dbe2 | fnclex // 898514ffffff | mov dword ptr [ebp - 0xec], eax condition: 7 of them and filesize < 679936 }
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