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 = "2022-08-05" 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 = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { 8d450c 50 8d4dc0 33f6 } // n = 4, score = 400 // 8d450c | lea eax, [ebp + 0xc] // 50 | push eax // 8d4dc0 | lea ecx, [ebp - 0x40] // 33f6 | xor esi, esi $sequence_1 = { 7303 8d4d28 57 56 } // n = 4, score = 400 // 7303 | jae 5 // 8d4d28 | lea ecx, [ebp + 0x28] // 57 | push edi // 56 | push esi $sequence_2 = { e8???????? 84c0 0f85a0000000 807b0400 7538 8b0b 85c9 } // n = 7, score = 400 // e8???????? | // 84c0 | test al, al // 0f85a0000000 | jne 0xa6 // 807b0400 | cmp byte ptr [ebx + 4], 0 // 7538 | jne 0x3a // 8b0b | mov ecx, dword ptr [ebx] // 85c9 | test ecx, ecx $sequence_3 = { 7324 8b4518 40 50 8d4d08 51 } // n = 6, score = 400 // 7324 | jae 0x26 // 8b4518 | mov eax, dword ptr [ebp + 0x18] // 40 | inc eax // 50 | push eax // 8d4d08 | lea ecx, [ebp + 8] // 51 | push ecx $sequence_4 = { e8???????? 83c420 8bf0 81fe???????? } // n = 4, score = 400 // e8???????? | // 83c420 | add esp, 0x20 // 8bf0 | mov esi, eax // 81fe???????? | $sequence_5 = { 807b0539 0f8fac000000 837db008 7d4d 807b0400 7538 } // n = 6, score = 400 // 807b0539 | cmp byte ptr [ebx + 5], 0x39 // 0f8fac000000 | jg 0xb2 // 837db008 | cmp dword ptr [ebp - 0x50], 8 // 7d4d | jge 0x4f // 807b0400 | cmp byte ptr [ebx + 4], 0 // 7538 | jne 0x3a $sequence_6 = { 8b06 eb02 8bc6 c6043800 8b7d08 8bc7 8d5001 } // n = 7, score = 400 // 8b06 | mov eax, dword ptr [esi] // eb02 | jmp 4 // 8bc6 | mov eax, esi // c6043800 | mov byte ptr [eax + edi], 0 // 8b7d08 | mov edi, dword ptr [ebp + 8] // 8bc7 | mov eax, edi // 8d5001 | lea edx, [eax + 1] $sequence_7 = { 7907 68???????? eb71 a802 } // n = 4, score = 400 // 7907 | jns 9 // 68???????? | // eb71 | jmp 0x73 // a802 | test al, 2 $sequence_8 = { 83ec1c 8bcc 6a0b c741140f000000 c7411000000000 68???????? } // n = 6, score = 400 // 83ec1c | sub esp, 0x1c // 8bcc | mov ecx, esp // 6a0b | push 0xb // c741140f000000 | mov dword ptr [ecx + 0x14], 0xf // c7411000000000 | mov dword ptr [ecx + 0x10], 0 // 68???????? | $sequence_9 = { 55 8bec 56 3ac1 7f12 0fbed0 0fbec1 } // n = 7, score = 400 // 55 | push ebp // 8bec | mov ebp, esp // 56 | push esi // 3ac1 | cmp al, cl // 7f12 | jg 0x14 // 0fbed0 | movsx edx, al // 0fbec1 | movsx eax, cl condition: 7 of them and filesize < 892928 }
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