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rule win_glitch_pos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.glitch_pos." 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.glitch_pos" 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 = { ffb504ffffff e8???????? 89855cfeffff eb07 } // n = 4, score = 100 // ffb504ffffff | push dword ptr [ebp - 0xfc] // e8???????? | // 89855cfeffff | mov dword ptr [ebp - 0x1a4], eax // eb07 | jmp 9 $sequence_1 = { c745fc01000000 8b550c 8d4dbc e8???????? 8b4514 } // n = 5, score = 100 // c745fc01000000 | mov dword ptr [ebp - 4], 1 // 8b550c | mov edx, dword ptr [ebp + 0xc] // 8d4dbc | lea ecx, [ebp - 0x44] // e8???????? | // 8b4514 | mov eax, dword ptr [ebp + 0x14] $sequence_2 = { 50 8b8508feffff 8b00 ffb508feffff ff9088000000 dbe2 898504feffff } // n = 7, score = 100 // 50 | push eax // 8b8508feffff | mov eax, dword ptr [ebp - 0x1f8] // 8b00 | mov eax, dword ptr [eax] // ffb508feffff | push dword ptr [ebp - 0x1f8] // ff9088000000 | call dword ptr [eax + 0x88] // dbe2 | fnclex // 898504feffff | mov dword ptr [ebp - 0x1fc], eax $sequence_3 = { 8b450c 33c9 66833800 0f9dc1 8b4510 33d2 } // n = 6, score = 100 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 33c9 | xor ecx, ecx // 66833800 | cmp word ptr [eax], 0 // 0f9dc1 | setge cl // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 33d2 | xor edx, edx $sequence_4 = { c745fc03000000 8d855cffffff 50 8d45bc 50 8b4508 } // n = 6, score = 100 // c745fc03000000 | mov dword ptr [ebp - 4], 3 // 8d855cffffff | lea eax, [ebp - 0xa4] // 50 | push eax // 8d45bc | lea eax, [ebp - 0x44] // 50 | push eax // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_5 = { e8???????? 83c414 0fbf85f0feffff 85c0 } // n = 4, score = 100 // e8???????? | // 83c414 | add esp, 0x14 // 0fbf85f0feffff | movsx eax, word ptr [ebp - 0x110] // 85c0 | test eax, eax $sequence_6 = { ff9028070000 833d????????00 751b 68???????? 68???????? e8???????? c785dcfeffff2cc34600 } // n = 7, score = 100 // ff9028070000 | call dword ptr [eax + 0x728] // 833d????????00 | // 751b | jne 0x1d // 68???????? | // 68???????? | // e8???????? | // c785dcfeffff2cc34600 | mov dword ptr [ebp - 0x124], 0x46c32c $sequence_7 = { ff90e8010000 dbe2 8945e0 837de000 7d1a 68e8010000 68???????? } // n = 7, score = 100 // ff90e8010000 | call dword ptr [eax + 0x1e8] // dbe2 | fnclex // 8945e0 | mov dword ptr [ebp - 0x20], eax // 837de000 | cmp dword ptr [ebp - 0x20], 0 // 7d1a | jge 0x1c // 68e8010000 | push 0x1e8 // 68???????? | $sequence_8 = { c78514ffffff0a000000 c7852cffffff04000280 c78524ffffff0a000000 c7853cffffff18000000 c78534ffffff02000000 6a10 58 } // n = 7, score = 100 // c78514ffffff0a000000 | mov dword ptr [ebp - 0xec], 0xa // c7852cffffff04000280 | mov dword ptr [ebp - 0xd4], 0x80020004 // c78524ffffff0a000000 | mov dword ptr [ebp - 0xdc], 0xa // c7853cffffff18000000 | mov dword ptr [ebp - 0xc4], 0x18 // c78534ffffff02000000 | mov dword ptr [ebp - 0xcc], 2 // 6a10 | push 0x10 // 58 | pop eax $sequence_9 = { 8d45cc 50 6a02 e8???????? 83c40c 8d8584feffff 50 } // n = 7, score = 100 // 8d45cc | lea eax, [ebp - 0x34] // 50 | push eax // 6a02 | push 2 // e8???????? | // 83c40c | add esp, 0xc // 8d8584feffff | lea eax, [ebp - 0x17c] // 50 | push eax condition: 7 of them and filesize < 1024000 }
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