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rule win_taleret_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.taleret." 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.taleret" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { ffd6 85c0 7443 8b2d???????? 8b3d???????? 8b1d???????? } // n = 6, score = 100 // ffd6 | call esi // 85c0 | test eax, eax // 7443 | je 0x45 // 8b2d???????? | // 8b3d???????? | // 8b1d???????? | $sequence_1 = { 51 ffd5 3d02010000 752a 8d542410 52 } // n = 6, score = 100 // 51 | push ecx // ffd5 | call ebp // 3d02010000 | cmp eax, 0x102 // 752a | jne 0x2c // 8d542410 | lea edx, dword ptr [esp + 0x10] // 52 | push edx $sequence_2 = { 51 68???????? 52 e8???????? 50 8d4c2414 c644243802 } // n = 7, score = 100 // 51 | push ecx // 68???????? | // 52 | push edx // e8???????? | // 50 | push eax // 8d4c2414 | lea ecx, dword ptr [esp + 0x14] // c644243802 | mov byte ptr [esp + 0x38], 2 $sequence_3 = { 83c8ff e9???????? 668b4b44 8b4340 51 } // n = 5, score = 100 // 83c8ff | or eax, 0xffffffff // e9???????? | // 668b4b44 | mov cx, word ptr [ebx + 0x44] // 8b4340 | mov eax, dword ptr [ebx + 0x40] // 51 | push ecx $sequence_4 = { 8b3d???????? 50 ffd7 8b742430 81e6ffff0000 } // n = 5, score = 100 // 8b3d???????? | // 50 | push eax // ffd7 | call edi // 8b742430 | mov esi, dword ptr [esp + 0x30] // 81e6ffff0000 | and esi, 0xffff $sequence_5 = { c68424ac0300000e e8???????? 8d4c2428 c68424a80300000d e8???????? 8d4c2430 c68424a80300000c } // n = 7, score = 100 // c68424ac0300000e | mov byte ptr [esp + 0x3ac], 0xe // e8???????? | // 8d4c2428 | lea ecx, dword ptr [esp + 0x28] // c68424a80300000d | mov byte ptr [esp + 0x3a8], 0xd // e8???????? | // 8d4c2430 | lea ecx, dword ptr [esp + 0x30] // c68424a80300000c | mov byte ptr [esp + 0x3a8], 0xc $sequence_6 = { ffd5 8b442414 85c0 0f8592000000 8d4c2410 6a00 } // n = 6, score = 100 // ffd5 | call ebp // 8b442414 | mov eax, dword ptr [esp + 0x14] // 85c0 | test eax, eax // 0f8592000000 | jne 0x98 // 8d4c2410 | lea ecx, dword ptr [esp + 0x10] // 6a00 | push 0 $sequence_7 = { 8d4c2414 c644242402 e8???????? 8d4c2414 c644242001 e8???????? } // n = 6, score = 100 // 8d4c2414 | lea ecx, dword ptr [esp + 0x14] // c644242402 | mov byte ptr [esp + 0x24], 2 // e8???????? | // 8d4c2414 | lea ecx, dword ptr [esp + 0x14] // c644242001 | mov byte ptr [esp + 0x20], 1 // e8???????? | $sequence_8 = { 8b842418080000 83c404 50 ff15???????? 5f 5b 5e } // n = 7, score = 100 // 8b842418080000 | mov eax, dword ptr [esp + 0x818] // 83c404 | add esp, 4 // 50 | push eax // ff15???????? | // 5f | pop edi // 5b | pop ebx // 5e | pop esi $sequence_9 = { e8???????? 85c0 7409 ebac 56 } // n = 5, score = 100 // e8???????? | // 85c0 | test eax, eax // 7409 | je 0xb // ebac | jmp 0xffffffae // 56 | push esi condition: 7 of them and filesize < 73728 }
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