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rule win_termite_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.termite." 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.termite" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { e8???????? 8945f0 837df400 7406 837df000 750a b8ffffffff } // n = 7, score = 200 // e8???????? | // 8945f0 | mov dword ptr [ebp - 0x10], eax // 837df400 | cmp dword ptr [ebp - 0xc], 0 // 7406 | je 8 // 837df000 | cmp dword ptr [ebp - 0x10], 0 // 750a | jne 0xc // b8ffffffff | mov eax, 0xffffffff $sequence_1 = { 8b4508 8945f0 c745f400000000 c745f400000000 eb10 c70424???????? e8???????? } // n = 7, score = 200 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8945f0 | mov dword ptr [ebp - 0x10], eax // c745f400000000 | mov dword ptr [ebp - 0xc], 0 // c745f400000000 | mov dword ptr [ebp - 0xc], 0 // eb10 | jmp 0x12 // c70424???????? | // e8???????? | $sequence_2 = { 89d8 5b 5e 5f 5d c3 837dc8ff } // n = 7, score = 200 // 89d8 | mov eax, ebx // 5b | pop ebx // 5e | pop esi // 5f | pop edi // 5d | pop ebp // c3 | ret // 837dc8ff | cmp dword ptr [ebp - 0x38], -1 $sequence_3 = { eb0f 8345fc01 837dfc63 7eb3 b8ffffffff c9 c3 } // n = 7, score = 200 // eb0f | jmp 0x11 // 8345fc01 | add dword ptr [ebp - 4], 1 // 837dfc63 | cmp dword ptr [ebp - 4], 0x63 // 7eb3 | jle 0xffffffb5 // b8ffffffff | mov eax, 0xffffffff // c9 | leave // c3 | ret $sequence_4 = { b800000000 eb03 8b45e4 83c44c 5b 5e } // n = 6, score = 200 // b800000000 | mov eax, 0 // eb03 | jmp 5 // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 83c44c | add esp, 0x4c // 5b | pop ebx // 5e | pop esi $sequence_5 = { eb19 8b45f4 83c040 8945f0 837df000 7507 b800000000 } // n = 7, score = 200 // eb19 | jmp 0x1b // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 83c040 | add eax, 0x40 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 837df000 | cmp dword ptr [ebp - 0x10], 0 // 7507 | jne 9 // b800000000 | mov eax, 0 $sequence_6 = { e9???????? 8b4508 8b401c 8b5508 83c208 89442404 } // n = 6, score = 200 // e9???????? | // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b401c | mov eax, dword ptr [eax + 0x1c] // 8b5508 | mov edx, dword ptr [ebp + 8] // 83c208 | add edx, 8 // 89442404 | mov dword ptr [esp + 4], eax $sequence_7 = { c704240a000000 e8???????? 90 c745f401000000 8b4508 890424 e8???????? } // n = 7, score = 200 // c704240a000000 | mov dword ptr [esp], 0xa // e8???????? | // 90 | nop // c745f401000000 | mov dword ptr [ebp - 0xc], 1 // 8b4508 | mov eax, dword ptr [ebp + 8] // 890424 | mov dword ptr [esp], eax // e8???????? | $sequence_8 = { 8b4010 8945f0 c745f400000000 eb41 8b450c 89442404 8b45f0 } // n = 7, score = 200 // 8b4010 | mov eax, dword ptr [eax + 0x10] // 8945f0 | mov dword ptr [ebp - 0x10], eax // c745f400000000 | mov dword ptr [ebp - 0xc], 0 // eb41 | jmp 0x43 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 89442404 | mov dword ptr [esp + 4], eax // 8b45f0 | mov eax, dword ptr [ebp - 0x10] $sequence_9 = { 8b45f0 89442404 8b4508 890424 e8???????? 8945e8 8b450c } // n = 7, score = 200 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 89442404 | mov dword ptr [esp + 4], eax // 8b4508 | mov eax, dword ptr [ebp + 8] // 890424 | mov dword ptr [esp], eax // e8???????? | // 8945e8 | mov dword ptr [ebp - 0x18], eax // 8b450c | mov eax, dword ptr [ebp + 0xc] condition: 7 of them and filesize < 312320 }
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