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rule win_glassrat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.glassrat." 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.glassrat" 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 = { 8d45ec 6a00 8d4d08 50 8b4318 } // n = 5, score = 200 // 8d45ec | lea eax, [ebp - 0x14] // 6a00 | push 0 // 8d4d08 | lea ecx, [ebp + 8] // 50 | push eax // 8b4318 | mov eax, dword ptr [ebx + 0x18] $sequence_1 = { 7408 6a00 ff15???????? 8b842424010000 8b8c2420010000 8b942418010000 } // n = 6, score = 200 // 7408 | je 0xa // 6a00 | push 0 // ff15???????? | // 8b842424010000 | mov eax, dword ptr [esp + 0x124] // 8b8c2420010000 | mov ecx, dword ptr [esp + 0x120] // 8b942418010000 | mov edx, dword ptr [esp + 0x118] $sequence_2 = { 8b5508 56 83ec10 c604320a 8b4508 } // n = 5, score = 200 // 8b5508 | mov edx, dword ptr [ebp + 8] // 56 | push esi // 83ec10 | sub esp, 0x10 // c604320a | mov byte ptr [edx + esi], 0xa // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_3 = { 85db 7493 8d95c4deffff b802000000 52 } // n = 5, score = 200 // 85db | test ebx, ebx // 7493 | je 0xffffff95 // 8d95c4deffff | lea edx, [ebp - 0x213c] // b802000000 | mov eax, 2 // 52 | push edx $sequence_4 = { b910000000 8945c8 8d7d80 8945cc 8d55c4 f3ab } // n = 6, score = 200 // b910000000 | mov ecx, 0x10 // 8945c8 | mov dword ptr [ebp - 0x38], eax // 8d7d80 | lea edi, [ebp - 0x80] // 8945cc | mov dword ptr [ebp - 0x34], eax // 8d55c4 | lea edx, [ebp - 0x3c] // f3ab | rep stosd dword ptr es:[edi], eax $sequence_5 = { 8d4c241c e8???????? 56 8d4c2424 c78424f802000001000000 e8???????? } // n = 6, score = 200 // 8d4c241c | lea ecx, [esp + 0x1c] // e8???????? | // 56 | push esi // 8d4c2424 | lea ecx, [esp + 0x24] // c78424f802000001000000 | mov dword ptr [esp + 0x2f8], 1 // e8???????? | $sequence_6 = { 51 8d95d8dfffff 6800200000 52 50 } // n = 5, score = 200 // 51 | push ecx // 8d95d8dfffff | lea edx, [ebp - 0x2028] // 6800200000 | push 0x2000 // 52 | push edx // 50 | push eax $sequence_7 = { 83c204 66ab aa 52 8d442408 } // n = 5, score = 200 // 83c204 | add edx, 4 // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al // 52 | push edx // 8d442408 | lea eax, [esp + 8] $sequence_8 = { f3a5 8bc8 33c0 83e103 c745fc00000000 f3a4 } // n = 6, score = 200 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bc8 | mov ecx, eax // 33c0 | xor eax, eax // 83e103 | and ecx, 3 // c745fc00000000 | mov dword ptr [ebp - 4], 0 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] $sequence_9 = { 40 ebeb 3bc1 751c 83f940 7317 } // n = 6, score = 200 // 40 | inc eax // ebeb | jmp 0xffffffed // 3bc1 | cmp eax, ecx // 751c | jne 0x1e // 83f940 | cmp ecx, 0x40 // 7317 | jae 0x19 condition: 7 of them and filesize < 81920 }
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