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rule elf_hideandseek_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 53 83ec14 8b44242c 8a5c2430 ff7004 ff74242c e8???????? } // n = 7, score = 100 // 53 | push ebx // 83ec14 | sub esp, 0x14 // 8b44242c | mov eax, dword ptr [esp + 0x2c] // 8a5c2430 | mov bl, byte ptr [esp + 0x30] // ff7004 | push dword ptr [eax + 4] // ff74242c | push dword ptr [esp + 0x2c] // e8???????? | $sequence_1 = { e8???????? 83c410 84c0 752e 83ec0c 8d84241c120000 50 } // n = 7, score = 100 // e8???????? | // 83c410 | add esp, 0x10 // 84c0 | test al, al // 752e | jne 0x30 // 83ec0c | sub esp, 0xc // 8d84241c120000 | lea eax, [esp + 0x121c] // 50 | push eax $sequence_2 = { 8d44244c 50 e8???????? 5b 8d442440 50 e8???????? } // n = 7, score = 100 // 8d44244c | lea eax, [esp + 0x4c] // 50 | push eax // e8???????? | // 5b | pop ebx // 8d442440 | lea eax, [esp + 0x40] // 50 | push eax // e8???????? | $sequence_3 = { 89ca 8b0424 0fa4d91e 31c8 8b4c2430 0fa4d31e 8b542404 } // n = 7, score = 100 // 89ca | mov edx, ecx // 8b0424 | mov eax, dword ptr [esp] // 0fa4d91e | shld ecx, ebx, 0x1e // 31c8 | xor eax, ecx // 8b4c2430 | mov ecx, dword ptr [esp + 0x30] // 0fa4d31e | shld ebx, edx, 0x1e // 8b542404 | mov edx, dword ptr [esp + 4] $sequence_4 = { 7411 0f821e040000 83f802 0f8508040000 eb04 50 50 } // n = 7, score = 100 // 7411 | je 0x13 // 0f821e040000 | jb 0x424 // 83f802 | cmp eax, 2 // 0f8508040000 | jne 0x40e // eb04 | jmp 6 // 50 | push eax // 50 | push eax $sequence_5 = { be00000000 b800000000 c1e210 09c6 c1e718 31db 0fb64504 } // n = 7, score = 100 // be00000000 | mov esi, 0 // b800000000 | mov eax, 0 // c1e210 | shl edx, 0x10 // 09c6 | or esi, eax // c1e718 | shl edi, 0x18 // 31db | xor ebx, ebx // 0fb64504 | movzx eax, byte ptr [ebp + 4] $sequence_6 = { 50 e8???????? 83c410 84c0 741a 8b542414 c7434403000000 } // n = 7, score = 100 // 50 | push eax // e8???????? | // 83c410 | add esp, 0x10 // 84c0 | test al, al // 741a | je 0x1c // 8b542414 | mov edx, dword ptr [esp + 0x14] // c7434403000000 | mov dword ptr [ebx + 0x44], 3 $sequence_7 = { 817e0c00010000 751a 8d5610 8d4650 53 68c0000000 50 } // n = 7, score = 100 // 817e0c00010000 | cmp dword ptr [esi + 0xc], 0x100 // 751a | jne 0x1c // 8d5610 | lea edx, [esi + 0x10] // 8d4650 | lea eax, [esi + 0x50] // 53 | push ebx // 68c0000000 | push 0xc0 // 50 | push eax $sequence_8 = { 56 53 8b7c2410 803d????????00 7561 83ec0c 6800000011 } // n = 7, score = 100 // 56 | push esi // 53 | push ebx // 8b7c2410 | mov edi, dword ptr [esp + 0x10] // 803d????????00 | // 7561 | jne 0x63 // 83ec0c | sub esp, 0xc // 6800000011 | push 0x11000000 $sequence_9 = { 50 8b8424ec000000 ff7008 e8???????? 89f2 8b8424f0000000 } // n = 6, score = 100 // 50 | push eax // 8b8424ec000000 | mov eax, dword ptr [esp + 0xec] // ff7008 | push dword ptr [eax + 8] // e8???????? | // 89f2 | mov edx, esi // 8b8424f0000000 | mov eax, dword ptr [esp + 0xf0] condition: 7 of them and filesize < 196608 }
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