Actor(s): DragonOK, Samurai Panda
There is no description at this point.
rule win_former_first_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.former_first_rat" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 56 8945e0 8945e4 8945e8 8945ec 8945f0 } // n = 6, score = 200 // 56 | push esi // 8945e0 | mov dword ptr [ebp - 0x20], eax // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 8945e8 | mov dword ptr [ebp - 0x18], eax // 8945ec | mov dword ptr [ebp - 0x14], eax // 8945f0 | mov dword ptr [ebp - 0x10], eax $sequence_1 = { 740c 68???????? bb06000000 eb0a 68???????? } // n = 5, score = 200 // 740c | je 0xe // 68???????? | // bb06000000 | mov ebx, 6 // eb0a | jmp 0xc // 68???????? | $sequence_2 = { 8bde e8???????? 85c0 754c } // n = 4, score = 200 // 8bde | mov ebx, esi // e8???????? | // 85c0 | test eax, eax // 754c | jne 0x4e $sequence_3 = { 8b0d???????? 3bce 7736 2bf1 b87fe0077e f7ee c1fa08 } // n = 7, score = 200 // 8b0d???????? | // 3bce | cmp ecx, esi // 7736 | ja 0x38 // 2bf1 | sub esi, ecx // b87fe0077e | mov eax, 0x7e07e07f // f7ee | imul esi // c1fa08 | sar edx, 8 $sequence_4 = { b810100000 e8???????? a1???????? 33c5 8945fc 56 57 } // n = 7, score = 200 // b810100000 | mov eax, 0x1010 // e8???????? | // a1???????? | // 33c5 | xor eax, ebp // 8945fc | mov dword ptr [ebp - 4], eax // 56 | push esi // 57 | push edi $sequence_5 = { 8b4c2410 8bde e8???????? 8b4c2418 8d542444 52 bb1c000000 } // n = 7, score = 200 // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] // 8bde | mov ebx, esi // e8???????? | // 8b4c2418 | mov ecx, dword ptr [esp + 0x18] // 8d542444 | lea edx, [esp + 0x44] // 52 | push edx // bb1c000000 | mov ebx, 0x1c $sequence_6 = { 753b 56 68???????? 68???????? e8???????? 8bf0 68???????? } // n = 7, score = 200 // 753b | jne 0x3d // 56 | push esi // 68???????? | // 68???????? | // e8???????? | // 8bf0 | mov esi, eax // 68???????? | $sequence_7 = { 85c0 7513 8b4608 50 68???????? e8???????? 83c408 } // n = 7, score = 200 // 85c0 | test eax, eax // 7513 | jne 0x15 // 8b4608 | mov eax, dword ptr [esi + 8] // 50 | push eax // 68???????? | // e8???????? | // 83c408 | add esp, 8 $sequence_8 = { e8???????? f30f6f00 f3410f7f07 33db f3410f6f07 } // n = 5, score = 100 // e8???????? | // f30f6f00 | inc ecx // f3410f7f07 | cmp ebx, edi // 33db | jne 0x14 // f3410f6f07 | movdqu xmm0, xmmword ptr [eax] $sequence_9 = { 488be9 83601800 488d0533e10200 488901 } // n = 4, score = 100 // 488be9 | inc ecx // 83601800 | movq qword ptr [edi], mm0 // 488d0533e10200 | xor ebx, ebx // 488901 | inc ecx $sequence_10 = { 4883ec20 488bd9 e8???????? 4c8d1d33d00100 4c891b 488bc3 4883c420 } // n = 7, score = 100 // 4883ec20 | movq mm0, qword ptr [edi] // 488bd9 | dec eax // e8???????? | // 4c8d1d33d00100 | mov ebp, ecx // 4c891b | and dword ptr [eax + 0x18], 0 // 488bc3 | dec eax // 4883c420 | lea eax, [0x2e133] $sequence_11 = { 498d95cc060000 488d4c2470 e8???????? 4c8bc0 488d542438 } // n = 5, score = 100 // 498d95cc060000 | mov ebx, ecx // 488d4c2470 | dec esp // e8???????? | // 4c8bc0 | lea ebx, [0x1d033] // 488d542438 | dec esp $sequence_12 = { 418bcd 4889742420 ff15???????? 413bc7 7411 45893c24 488bcd } // n = 7, score = 100 // 418bcd | mov dword ptr [ebx], ebx // 4889742420 | dec eax // ff15???????? | // 413bc7 | mov eax, ebx // 7411 | dec eax // 45893c24 | add esp, 0x20 // 488bcd | dec esp $sequence_13 = { e8???????? c744243003000000 488d542430 488d8c2498000000 e8???????? 488d942498000000 } // n = 6, score = 100 // e8???????? | // c744243003000000 | mov dword ptr [esp + 0x308], edi // 488d542430 | inc esp // 488d8c2498000000 | mov byte ptr [esp + 0x2f8], bh // e8???????? | // 488d942498000000 | dec eax $sequence_14 = { 4c89bc2408030000 4488bc24f8020000 4883bc24e002000010 720d 488b8c24c8020000 e8???????? } // n = 6, score = 100 // 4c89bc2408030000 | dec eax // 4488bc24f8020000 | mov dword ptr [ecx], eax // 4883bc24e002000010 | dec eax // 720d | sub esp, 0x20 // 488b8c24c8020000 | dec eax // e8???????? | $sequence_15 = { e8???????? 448be8 eb06 8b18 448b6804 413bdf 7512 } // n = 7, score = 100 // e8???????? | // 448be8 | inc esp // eb06 | mov ebp, eax // 8b18 | jmp 8 // 448b6804 | mov ebx, dword ptr [eax] // 413bdf | inc esp // 7512 | mov ebp, dword ptr [eax + 4] condition: 7 of them and filesize < 626688 }
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