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rule win_campoloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.campoloader." 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.campoloader" 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 = { 8a11 8855e4 8345d001 807de400 75ee 8b45d0 } // n = 6, score = 200 // 8a11 | mov dl, byte ptr [ecx] // 8855e4 | mov byte ptr [ebp - 0x1c], dl // 8345d001 | add dword ptr [ebp - 0x30], 1 // 807de400 | cmp byte ptr [ebp - 0x1c], 0 // 75ee | jne 0xfffffff0 // 8b45d0 | mov eax, dword ptr [ebp - 0x30] $sequence_1 = { 8d85ecfdffff 50 ff15???????? 83c40c 8d8d54efffff 51 8d95ecfdffff } // n = 7, score = 200 // 8d85ecfdffff | lea eax, [ebp - 0x214] // 50 | push eax // ff15???????? | // 83c40c | add esp, 0xc // 8d8d54efffff | lea ecx, [ebp - 0x10ac] // 51 | push ecx // 8d95ecfdffff | lea edx, [ebp - 0x214] $sequence_2 = { 2b4dd8 894dd4 8b55f8 0355d4 8955f8 8b45f8 8be5 } // n = 7, score = 200 // 2b4dd8 | sub ecx, dword ptr [ebp - 0x28] // 894dd4 | mov dword ptr [ebp - 0x2c], ecx // 8b55f8 | mov edx, dword ptr [ebp - 8] // 0355d4 | add edx, dword ptr [ebp - 0x2c] // 8955f8 | mov dword ptr [ebp - 8], edx // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8be5 | mov esp, ebp $sequence_3 = { 6a10 8d9520f1ffff 52 8b8568efffff 50 ff15???????? } // n = 6, score = 200 // 6a10 | push 0x10 // 8d9520f1ffff | lea edx, [ebp - 0xee0] // 52 | push edx // 8b8568efffff | mov eax, dword ptr [ebp - 0x1098] // 50 | push eax // ff15???????? | $sequence_4 = { 8b8580efffff 2b8560efffff 89855cefffff 8b8d5cefffff 898d58efffff c78584efffff00000000 8d55f4 } // n = 7, score = 200 // 8b8580efffff | mov eax, dword ptr [ebp - 0x1080] // 2b8560efffff | sub eax, dword ptr [ebp - 0x10a0] // 89855cefffff | mov dword ptr [ebp - 0x10a4], eax // 8b8d5cefffff | mov ecx, dword ptr [ebp - 0x10a4] // 898d58efffff | mov dword ptr [ebp - 0x10a8], ecx // c78584efffff00000000 | mov dword ptr [ebp - 0x107c], 0 // 8d55f4 | lea edx, [ebp - 0xc] $sequence_5 = { 51 ff15???????? 83c40c c7458844000000 b907000000 be???????? } // n = 6, score = 200 // 51 | push ecx // ff15???????? | // 83c40c | add esp, 0xc // c7458844000000 | mov dword ptr [ebp - 0x78], 0x44 // b907000000 | mov ecx, 7 // be???????? | $sequence_6 = { 50 ff15???????? 89858cefffff 83bd8cefffff00 0f8ee9000000 83bd64efffff01 7533 } // n = 7, score = 200 // 50 | push eax // ff15???????? | // 89858cefffff | mov dword ptr [ebp - 0x1074], eax // 83bd8cefffff00 | cmp dword ptr [ebp - 0x1074], 0 // 0f8ee9000000 | jle 0xef // 83bd64efffff01 | cmp dword ptr [ebp - 0x109c], 1 // 7533 | jne 0x35 $sequence_7 = { 8a11 8855e6 8345d801 807de600 75ee } // n = 5, score = 200 // 8a11 | mov dl, byte ptr [ecx] // 8855e6 | mov byte ptr [ebp - 0x1a], dl // 8345d801 | add dword ptr [ebp - 0x28], 1 // 807de600 | cmp byte ptr [ebp - 0x1a], 0 // 75ee | jne 0xfffffff0 $sequence_8 = { 8d8d90efffff 51 6802010000 ff15???????? 85c0 } // n = 5, score = 200 // 8d8d90efffff | lea ecx, [ebp - 0x1070] // 51 | push ecx // 6802010000 | push 0x102 // ff15???????? | // 85c0 | test eax, eax $sequence_9 = { 57 6a44 6a00 8d4588 } // n = 4, score = 200 // 57 | push edi // 6a44 | push 0x44 // 6a00 | push 0 // 8d4588 | lea eax, [ebp - 0x78] condition: 7 of them and filesize < 66560 }
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