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 = "2023-01-25" 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 = "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 = { 8d4c2420 23f7 e8???????? 3bf3 740a 8b16 } // n = 6, score = 400 // 8d4c2420 | lea ecx, [esp + 0x20] // 23f7 | and esi, edi // e8???????? | // 3bf3 | cmp esi, ebx // 740a | je 0xc // 8b16 | mov edx, dword ptr [esi] $sequence_1 = { 8bec 56 57 8bf0 bf0f000000 8d642400 8bce } // n = 7, score = 400 // 8bec | mov ebp, esp // 56 | push esi // 57 | push edi // 8bf0 | mov esi, eax // bf0f000000 | mov edi, 0xf // 8d642400 | lea esp, [esp] // 8bce | mov ecx, esi $sequence_2 = { 41 53 56 3bc1 } // n = 4, score = 400 // 41 | inc ecx // 53 | push ebx // 56 | push esi // 3bc1 | cmp eax, ecx $sequence_3 = { 8b45bc c6002d 8b0b 40 8945bc 85c9 7433 } // n = 7, score = 400 // 8b45bc | mov eax, dword ptr [ebp - 0x44] // c6002d | mov byte ptr [eax], 0x2d // 8b0b | mov ecx, dword ptr [ebx] // 40 | inc eax // 8945bc | mov dword ptr [ebp - 0x44], eax // 85c9 | test ecx, ecx // 7433 | je 0x35 $sequence_4 = { 83ec1c 8bcc 6a0f c741140f000000 c7411000000000 68???????? } // n = 6, score = 400 // 83ec1c | sub esp, 0x1c // 8bcc | mov ecx, esp // 6a0f | push 0xf // c741140f000000 | mov dword ptr [ecx + 0x14], 0xf // c7411000000000 | mov dword ptr [ecx + 0x10], 0 // 68???????? | $sequence_5 = { 7433 4a 7410 8b45e0 83ff10 7303 } // n = 6, score = 400 // 7433 | je 0x35 // 4a | dec edx // 7410 | je 0x12 // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 83ff10 | cmp edi, 0x10 // 7303 | jae 5 $sequence_6 = { 83ec1c 8bcc 6a14 c741140f000000 } // n = 4, score = 400 // 83ec1c | sub esp, 0x1c // 8bcc | mov ecx, esp // 6a14 | push 0x14 // c741140f000000 | mov dword ptr [ecx + 0x14], 0xf $sequence_7 = { 40 894704 8d4db4 e8???????? } // n = 4, score = 400 // 40 | inc eax // 894704 | mov dword ptr [edi + 4], eax // 8d4db4 | lea ecx, [ebp - 0x4c] // e8???????? | $sequence_8 = { 8d4d14 e8???????? 83c410 50 8d542420 52 } // n = 6, score = 400 // 8d4d14 | lea ecx, [ebp + 0x14] // e8???????? | // 83c410 | add esp, 0x10 // 50 | push eax // 8d542420 | lea edx, [esp + 0x20] // 52 | push edx $sequence_9 = { 8bec 8b4914 56 8b7508 8bc1 57 c746140f000000 } // n = 7, score = 400 // 8bec | mov ebp, esp // 8b4914 | mov ecx, dword ptr [ecx + 0x14] // 56 | push esi // 8b7508 | mov esi, dword ptr [ebp + 8] // 8bc1 | mov eax, ecx // 57 | push edi // c746140f000000 | mov dword ptr [esi + 0x14], 0xf condition: 7 of them and filesize < 892928 }
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