Actor(s): RANCOR
There is no description at this point.
rule win_plaintee_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.plaintee." 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.plaintee" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { b001 5e 81c490010000 c3 } // n = 4, score = 300 // b001 | mov al, 1 // 5e | pop esi // 81c490010000 | add esp, 0x190 // c3 | ret $sequence_1 = { 740a b001 5e 81c490010000 c3 6a11 } // n = 6, score = 300 // 740a | je 0xc // b001 | mov al, 1 // 5e | pop esi // 81c490010000 | add esp, 0x190 // c3 | ret // 6a11 | push 0x11 $sequence_2 = { 8b742410 f7f9 8b4c240c b801000000 80c20a } // n = 5, score = 300 // 8b742410 | mov esi, dword ptr [esp + 0x10] // f7f9 | idiv ecx // 8b4c240c | mov ecx, dword ptr [esp + 0xc] // b801000000 | mov eax, 1 // 80c20a | add dl, 0xa $sequence_3 = { 8b442414 8b4c2410 8b54240c 56 8b74240c 50 } // n = 6, score = 300 // 8b442414 | mov eax, dword ptr [esp + 0x14] // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] // 8b54240c | mov edx, dword ptr [esp + 0xc] // 56 | push esi // 8b74240c | mov esi, dword ptr [esp + 0xc] // 50 | push eax $sequence_4 = { 50 6a00 56 51 8b4c241c 51 ff15???????? } // n = 7, score = 300 // 50 | push eax // 6a00 | push 0 // 56 | push esi // 51 | push ecx // 8b4c241c | mov ecx, dword ptr [esp + 0x1c] // 51 | push ecx // ff15???????? | $sequence_5 = { 33f6 8bce e8???????? 8a8669010000 84c0 7416 85f6 } // n = 7, score = 300 // 33f6 | xor esi, esi // 8bce | mov ecx, esi // e8???????? | // 8a8669010000 | mov al, byte ptr [esi + 0x169] // 84c0 | test al, al // 7416 | je 0x18 // 85f6 | test esi, esi $sequence_6 = { 32da 881c31 41 3bc8 7cf3 5b } // n = 6, score = 300 // 32da | xor bl, dl // 881c31 | mov byte ptr [ecx + esi], bl // 41 | inc ecx // 3bc8 | cmp ecx, eax // 7cf3 | jl 0xfffffff5 // 5b | pop ebx $sequence_7 = { ff15???????? 83f8ff 898638010000 750a b001 5e } // n = 6, score = 300 // ff15???????? | // 83f8ff | cmp eax, -1 // 898638010000 | mov dword ptr [esi + 0x138], eax // 750a | jne 0xc // b001 | mov al, 1 // 5e | pop esi $sequence_8 = { a4 83c9ff 8bfb f2ae f7d1 } // n = 5, score = 300 // a4 | movsb byte ptr es:[edi], byte ptr [esi] // 83c9ff | or ecx, 0xffffffff // 8bfb | mov edi, ebx // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx $sequence_9 = { 8b442414 52 50 6a00 56 51 } // n = 6, score = 300 // 8b442414 | mov eax, dword ptr [esp + 0x14] // 52 | push edx // 50 | push eax // 6a00 | push 0 // 56 | push esi // 51 | push ecx condition: 7 of them and filesize < 73728 }
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