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rule win_solarbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.solarbot." 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.solarbot" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 89c7 6800020000 8d8500feffff 50 e8???????? } // n = 5, score = 300 // 89c7 | mov edi, eax // 6800020000 | push 0x200 // 8d8500feffff | lea eax, [ebp - 0x200] // 50 | push eax // e8???????? | $sequence_1 = { 8b7508 8a5d0c 8b7d10 c745d800000000 6a20 8d45dc 50 } // n = 7, score = 300 // 8b7508 | mov esi, dword ptr [ebp + 8] // 8a5d0c | mov bl, byte ptr [ebp + 0xc] // 8b7d10 | mov edi, dword ptr [ebp + 0x10] // c745d800000000 | mov dword ptr [ebp - 0x28], 0 // 6a20 | push 0x20 // 8d45dc | lea eax, [ebp - 0x24] // 50 | push eax $sequence_2 = { 83ec04 64a130000000 8b400c 8b4014 8b00 8b00 8b4010 } // n = 7, score = 300 // 83ec04 | sub esp, 4 // 64a130000000 | mov eax, dword ptr fs:[0x30] // 8b400c | mov eax, dword ptr [eax + 0xc] // 8b4014 | mov eax, dword ptr [eax + 0x14] // 8b00 | mov eax, dword ptr [eax] // 8b00 | mov eax, dword ptr [eax] // 8b4010 | mov eax, dword ptr [eax + 0x10] $sequence_3 = { e8???????? 8d45f0 50 8d85f0fbffff 50 6a00 6a00 } // n = 7, score = 300 // e8???????? | // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax // 8d85f0fbffff | lea eax, [ebp - 0x410] // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 $sequence_4 = { e8???????? c3 f4 e8???????? c3 e8???????? 45 } // n = 7, score = 300 // e8???????? | // c3 | ret // f4 | hlt // e8???????? | // c3 | ret // e8???????? | // 45 | inc ebp $sequence_5 = { 0fb6d1 83fa68 7405 80f9e9 7502 } // n = 5, score = 300 // 0fb6d1 | movzx edx, cl // 83fa68 | cmp edx, 0x68 // 7405 | je 7 // 80f9e9 | cmp cl, 0xe9 // 7502 | jne 4 $sequence_6 = { 8d45e0 50 8b45fc 8b55e8 01d0 50 } // n = 6, score = 300 // 8d45e0 | lea eax, [ebp - 0x20] // 50 | push eax // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b55e8 | mov edx, dword ptr [ebp - 0x18] // 01d0 | add eax, edx // 50 | push eax $sequence_7 = { 83c044 8985e4fdffff 8b85e0fdffff 0385d0fdffff 8b583c 83bdccfdffff01 7532 } // n = 7, score = 300 // 83c044 | add eax, 0x44 // 8985e4fdffff | mov dword ptr [ebp - 0x21c], eax // 8b85e0fdffff | mov eax, dword ptr [ebp - 0x220] // 0385d0fdffff | add eax, dword ptr [ebp - 0x230] // 8b583c | mov ebx, dword ptr [eax + 0x3c] // 83bdccfdffff01 | cmp dword ptr [ebp - 0x234], 1 // 7532 | jne 0x34 $sequence_8 = { 83fe05 750a ff75f0 56 } // n = 4, score = 300 // 83fe05 | cmp esi, 5 // 750a | jne 0xc // ff75f0 | push dword ptr [ebp - 0x10] // 56 | push esi $sequence_9 = { ffd0 668945f2 66c745f00200 8b45f4 85c0 0f86a9020000 } // n = 6, score = 300 // ffd0 | call eax // 668945f2 | mov word ptr [ebp - 0xe], ax // 66c745f00200 | mov word ptr [ebp - 0x10], 2 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 85c0 | test eax, eax // 0f86a9020000 | jbe 0x2af condition: 7 of them and filesize < 204800 }
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