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rule win_campoloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 75ee 8b45d8 2b45b4 8945b0 8b4db0 894dc8 eb39 } // n = 7, score = 200 // 75ee | jne 0xfffffff0 // 8b45d8 | mov eax, dword ptr [ebp - 0x28] // 2b45b4 | sub eax, dword ptr [ebp - 0x4c] // 8945b0 | mov dword ptr [ebp - 0x50], eax // 8b4db0 | mov ecx, dword ptr [ebp - 0x50] // 894dc8 | mov dword ptr [ebp - 0x38], ecx // eb39 | jmp 0x3b $sequence_1 = { 8945f0 837df000 743e 8b55f0 2b5508 } // n = 5, score = 200 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 837df000 | cmp dword ptr [ebp - 0x10], 0 // 743e | je 0x40 // 8b55f0 | mov edx, dword ptr [ebp - 0x10] // 2b5508 | sub edx, dword ptr [ebp + 8] $sequence_2 = { 3b4da0 7318 8b5508 0355cc 0fbe02 83f82f 7508 } // n = 7, score = 200 // 3b4da0 | cmp ecx, dword ptr [ebp - 0x60] // 7318 | jae 0x1a // 8b5508 | mov edx, dword ptr [ebp + 8] // 0355cc | add edx, dword ptr [ebp - 0x34] // 0fbe02 | movsx eax, byte ptr [edx] // 83f82f | cmp eax, 0x2f // 7508 | jne 0xa $sequence_3 = { ff15???????? 83c408 8945f0 837df000 743c } // n = 5, score = 200 // ff15???????? | // 83c408 | add esp, 8 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 837df000 | cmp dword ptr [ebp - 0x10], 0 // 743c | je 0x3e $sequence_4 = { 8345dc01 807de700 75ee 8b45dc 2b45bc 8945b8 } // n = 6, score = 200 // 8345dc01 | add dword ptr [ebp - 0x24], 1 // 807de700 | cmp byte ptr [ebp - 0x19], 0 // 75ee | jne 0xfffffff0 // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 2b45bc | sub eax, dword ptr [ebp - 0x44] // 8945b8 | mov dword ptr [ebp - 0x48], eax $sequence_5 = { 50 ff15???????? 83c40c 8d8d54efffff 51 8d95ecfdffff } // n = 6, score = 200 // 50 | push eax // ff15???????? | // 83c40c | add esp, 0xc // 8d8d54efffff | lea ecx, [ebp - 0x10ac] // 51 | push ecx // 8d95ecfdffff | lea edx, [ebp - 0x214] $sequence_6 = { 8a0d???????? 884df8 6804010000 6a00 } // n = 4, score = 200 // 8a0d???????? | // 884df8 | mov byte ptr [ebp - 8], cl // 6804010000 | push 0x104 // 6a00 | push 0 $sequence_7 = { 51 8d55f4 52 8b4508 50 ff15???????? } // n = 6, score = 200 // 51 | push ecx // 8d55f4 | lea edx, [ebp - 0xc] // 52 | push edx // 8b4508 | mov eax, dword ptr [ebp + 8] // 50 | push eax // ff15???????? | $sequence_8 = { 66898522f1ffff b902000000 66898d20f1ffff ba04000000 6bc200 8b8d50efffff 8b510c } // n = 7, score = 200 // 66898522f1ffff | mov word ptr [ebp - 0xede], ax // b902000000 | mov ecx, 2 // 66898d20f1ffff | mov word ptr [ebp - 0xee0], cx // ba04000000 | mov edx, 4 // 6bc200 | imul eax, edx, 0 // 8b8d50efffff | mov ecx, dword ptr [ebp - 0x10b0] // 8b510c | mov edx, dword ptr [ecx + 0xc] $sequence_9 = { 8945fc 56 57 6a44 6a00 8d4588 } // n = 6, score = 200 // 8945fc | mov dword ptr [ebp - 4], eax // 56 | push esi // 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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