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rule elf_hideandseek_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-10-07" version = "1" description = "Detects elf.hideandseek." 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/elf.hideandseek" malpedia_rule_date = "20221007" malpedia_hash = "597f9539014e3d0f350c069cd804aa71679486ae" malpedia_version = "20221010" 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 = { 89c3 85c0 0f85f3010000 8b542408 89f8 e8???????? 89fa } // n = 7, score = 100 // 89c3 | mov ebx, eax // 85c0 | test eax, eax // 0f85f3010000 | jne 0x1f9 // 8b542408 | mov edx, dword ptr [esp + 8] // 89f8 | mov eax, edi // e8???????? | // 89fa | mov edx, edi $sequence_1 = { 89c6 8b542444 8b4c2440 895c243c 8b5c2444 0facd01c 0facf21c } // n = 7, score = 100 // 89c6 | mov esi, eax // 8b542444 | mov edx, dword ptr [esp + 0x44] // 8b4c2440 | mov ecx, dword ptr [esp + 0x40] // 895c243c | mov dword ptr [esp + 0x3c], ebx // 8b5c2444 | mov ebx, dword ptr [esp + 0x44] // 0facd01c | shrd eax, edx, 0x1c // 0facf21c | shrd edx, esi, 0x1c $sequence_2 = { 3c6d 0f8532050000 e9???????? 3c7a 0f84d2010000 3c7e 0f851d050000 } // n = 7, score = 100 // 3c6d | cmp al, 0x6d // 0f8532050000 | jne 0x538 // e9???????? | // 3c7a | cmp al, 0x7a // 0f84d2010000 | je 0x1d8 // 3c7e | cmp al, 0x7e // 0f851d050000 | jne 0x523 $sequence_3 = { 83c410 89c3 85c0 7573 8b06 8b542408 83c00c } // n = 7, score = 100 // 83c410 | add esp, 0x10 // 89c3 | mov ebx, eax // 85c0 | test eax, eax // 7573 | jne 0x75 // 8b06 | mov eax, dword ptr [esi] // 8b542408 | mov edx, dword ptr [esp + 8] // 83c00c | add eax, 0xc $sequence_4 = { 83c410 ba???????? 39d3 7425 837a4400 } // n = 5, score = 100 // 83c410 | add esp, 0x10 // ba???????? | // 39d3 | cmp ebx, edx // 7425 | je 0x27 // 837a4400 | cmp dword ptr [edx + 0x44], 0 $sequence_5 = { 50 ffb424fc020000 e8???????? c704243c000000 e8???????? e8???????? 83c410 } // n = 7, score = 100 // 50 | push eax // ffb424fc020000 | push dword ptr [esp + 0x2fc] // e8???????? | // c704243c000000 | mov dword ptr [esp], 0x3c // e8???????? | // e8???????? | // 83c410 | add esp, 0x10 $sequence_6 = { 85c0 741b 55 55 8d5c2414 53 50 } // n = 7, score = 100 // 85c0 | test eax, eax // 741b | je 0x1d // 55 | push ebp // 55 | push ebp // 8d5c2414 | lea ebx, [esp + 0x14] // 53 | push ebx // 50 | push eax $sequence_7 = { 6a02 e8???????? 83c410 89c3 85c0 781e } // n = 6, score = 100 // 6a02 | push 2 // e8???????? | // 83c410 | add esp, 0x10 // 89c3 | mov ebx, eax // 85c0 | test eax, eax // 781e | js 0x20 $sequence_8 = { 2b4348 3dff0f0000 7e09 e8???????? a807 749e 4e } // n = 7, score = 100 // 2b4348 | sub eax, dword ptr [ebx + 0x48] // 3dff0f0000 | cmp eax, 0xfff // 7e09 | jle 0xb // e8???????? | // a807 | test al, 7 // 749e | je 0xffffffa0 // 4e | dec esi $sequence_9 = { 1394ec04010000 01442470 11542474 8b9424d0000000 03542470 8b842498000000 134c2474 } // n = 7, score = 100 // 1394ec04010000 | adc edx, dword ptr [esp + ebp*8 + 0x104] // 01442470 | add dword ptr [esp + 0x70], eax // 11542474 | adc dword ptr [esp + 0x74], edx // 8b9424d0000000 | mov edx, dword ptr [esp + 0xd0] // 03542470 | add edx, dword ptr [esp + 0x70] // 8b842498000000 | mov eax, dword ptr [esp + 0x98] // 134c2474 | adc ecx, dword ptr [esp + 0x74] condition: 7 of them and filesize < 196608 }
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