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rule win_termite_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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???????? 8b4508 8b550c 895014 b801000000 c9 c3 } // n = 7, score = 200 // e8???????? | // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b550c | mov edx, dword ptr [ebp + 0xc] // 895014 | mov dword ptr [eax + 0x14], edx // b801000000 | mov eax, 1 // c9 | leave // c3 | ret $sequence_1 = { 7406 837d0c00 750c c745f4ffffffff e9???????? 8b450c 83c008 } // n = 7, score = 200 // 7406 | je 8 // 837d0c00 | cmp dword ptr [ebp + 0xc], 0 // 750c | jne 0xe // c745f4ffffffff | mov dword ptr [ebp - 0xc], 0xffffffff // e9???????? | // 8b450c | mov eax, dword ptr [ebp + 0xc] // 83c008 | add eax, 8 $sequence_2 = { 895004 8b4508 8d5008 c744240832000000 8b4514 89442404 891424 } // n = 7, score = 200 // 895004 | mov dword ptr [eax + 4], edx // 8b4508 | mov eax, dword ptr [ebp + 8] // 8d5008 | lea edx, [eax + 8] // c744240832000000 | mov dword ptr [esp + 8], 0x32 // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 89442404 | mov dword ptr [esp + 4], eax // 891424 | mov dword ptr [esp], edx $sequence_3 = { c7442404???????? 8b45f4 890424 e8???????? c70424???????? e8???????? c744240844000000 } // n = 7, score = 200 // c7442404???????? | // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 890424 | mov dword ptr [esp], eax // e8???????? | // c70424???????? | // e8???????? | // c744240844000000 | mov dword ptr [esp + 8], 0x44 $sequence_4 = { 7404 3c2b 7507 8b7d14 0fb64701 } // n = 5, score = 200 // 7404 | je 6 // 3c2b | cmp al, 0x2b // 7507 | jne 9 // 8b7d14 | mov edi, dword ptr [ebp + 0x14] // 0fb64701 | movzx eax, byte ptr [edi + 1] $sequence_5 = { c70424???????? e8???????? c704240a000000 e8???????? b8ffffffff eb7a 8b45ec } // n = 7, score = 200 // c70424???????? | // e8???????? | // c704240a000000 | mov dword ptr [esp], 0xa // e8???????? | // b8ffffffff | mov eax, 0xffffffff // eb7a | jmp 0x7c // 8b45ec | mov eax, dword ptr [ebp - 0x14] $sequence_6 = { 83ec18 8b450c 89442404 8b4508 890424 e8???????? 83f8ff } // n = 7, score = 200 // 83ec18 | sub esp, 0x18 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 89442404 | mov dword ptr [esp + 4], eax // 8b4508 | mov eax, dword ptr [ebp + 8] // 890424 | mov dword ptr [esp], eax // e8???????? | // 83f8ff | cmp eax, -1 $sequence_7 = { 55 89e5 57 56 53 83ec2c c745e001000000 } // n = 7, score = 200 // 55 | push ebp // 89e5 | mov ebp, esp // 57 | push edi // 56 | push esi // 53 | push ebx // 83ec2c | sub esp, 0x2c // c745e001000000 | mov dword ptr [ebp - 0x20], 1 $sequence_8 = { 8d45dc 890424 e8???????? c744240804000000 8d45d8 89442404 8b4510 } // n = 7, score = 200 // 8d45dc | lea eax, [ebp - 0x24] // 890424 | mov dword ptr [esp], eax // e8???????? | // c744240804000000 | mov dword ptr [esp + 8], 4 // 8d45d8 | lea eax, [ebp - 0x28] // 89442404 | mov dword ptr [esp + 4], eax // 8b4510 | mov eax, dword ptr [ebp + 0x10] $sequence_9 = { 89e5 83ec28 c745f400000000 8b4508 8b00 85c0 } // n = 6, score = 200 // 89e5 | mov ebp, esp // 83ec28 | sub esp, 0x28 // c745f400000000 | mov dword ptr [ebp - 0xc], 0 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b00 | mov eax, dword ptr [eax] // 85c0 | test eax, eax condition: 7 of them and filesize < 312320 }
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