Actor(s): APT33
There is no description at this point.
rule win_turnedup_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.turnedup." 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.turnedup" 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 = { 83ec10 3dffffff3f 7711 03c0 03c0 50 e8???????? } // n = 7, score = 400 // 83ec10 | sub esp, 0x10 // 3dffffff3f | cmp eax, 0x3fffffff // 7711 | ja 0x13 // 03c0 | add eax, eax // 03c0 | add eax, eax // 50 | push eax // e8???????? | $sequence_1 = { eb06 c70600000000 c6460401 807e0539 7f7f } // n = 5, score = 400 // eb06 | jmp 8 // c70600000000 | mov dword ptr [esi], 0 // c6460401 | mov byte ptr [esi + 4], 1 // 807e0539 | cmp byte ptr [esi + 5], 0x39 // 7f7f | jg 0x81 $sequence_2 = { 8bec 8b4910 56 8b7508 8bc1 57 c746140f000000 } // n = 7, score = 400 // 8bec | mov ebp, esp // 8b4910 | mov ecx, dword ptr [ecx + 0x10] // 56 | push esi // 8b7508 | mov esi, dword ptr [ebp + 8] // 8bc1 | mov eax, ecx // 57 | push edi // c746140f000000 | mov dword ptr [esi + 0x14], 0xf $sequence_3 = { 53 56 3bc1 770f bb???????? } // n = 5, score = 400 // 53 | push ebx // 56 | push esi // 3bc1 | cmp eax, ecx // 770f | ja 0x11 // bb???????? | $sequence_4 = { b80f000000 8945dc 895dd8 885dc8 6a0c 894114 895910 } // n = 7, score = 400 // b80f000000 | mov eax, 0xf // 8945dc | mov dword ptr [ebp - 0x24], eax // 895dd8 | mov dword ptr [ebp - 0x28], ebx // 885dc8 | mov byte ptr [ebp - 0x38], bl // 6a0c | push 0xc // 894114 | mov dword ptr [ecx + 0x14], eax // 895910 | mov dword ptr [ecx + 0x10], ebx $sequence_5 = { 8d4d98 e8???????? 8d4da4 51 e8???????? } // n = 5, score = 400 // 8d4d98 | lea ecx, [ebp - 0x68] // e8???????? | // 8d4da4 | lea ecx, [ebp - 0x5c] // 51 | push ecx // e8???????? | $sequence_6 = { 7518 81fbffff0000 7710 807ddc2d 7502 f7db 8b55c8 } // n = 7, score = 400 // 7518 | jne 0x1a // 81fbffff0000 | cmp ebx, 0xffff // 7710 | ja 0x12 // 807ddc2d | cmp byte ptr [ebp - 0x24], 0x2d // 7502 | jne 4 // f7db | neg ebx // 8b55c8 | mov edx, dword ptr [ebp - 0x38] $sequence_7 = { e8???????? 83c404 3bc7 7424 8906 33c9 8908 } // n = 7, score = 400 // e8???????? | // 83c404 | add esp, 4 // 3bc7 | cmp eax, edi // 7424 | je 0x26 // 8906 | mov dword ptr [esi], eax // 33c9 | xor ecx, ecx // 8908 | mov dword ptr [eax], ecx $sequence_8 = { 895e10 881e 3bf1 745a 837e1410 720b } // n = 6, score = 400 // 895e10 | mov dword ptr [esi + 0x10], ebx // 881e | mov byte ptr [esi], bl // 3bf1 | cmp esi, ecx // 745a | je 0x5c // 837e1410 | cmp dword ptr [esi + 0x14], 0x10 // 720b | jb 0xd $sequence_9 = { 43 895dbc e8???????? 8b4dd8 } // n = 4, score = 400 // 43 | inc ebx // 895dbc | mov dword ptr [ebp - 0x44], ebx // e8???????? | // 8b4dd8 | mov ecx, dword ptr [ebp - 0x28] condition: 7 of them and filesize < 892928 }
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