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rule win_exaramel_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.exaramel." 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.exaramel" 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 = { 5f b80c000000 5e 8b4dfc 33cd } // n = 5, score = 100 // 5f | pop edi // b80c000000 | mov eax, 0xc // 5e | pop esi // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 33cd | xor ecx, ebp $sequence_1 = { 0fb680b04b4000 ff2485744b4000 6683090b 8d4202 5d c3 66830902 } // n = 7, score = 100 // 0fb680b04b4000 | movzx eax, byte ptr [eax + 0x404bb0] // ff2485744b4000 | jmp dword ptr [eax*4 + 0x404b74] // 6683090b | or word ptr [ecx], 0xb // 8d4202 | lea eax, [edx + 2] // 5d | pop ebp // c3 | ret // 66830902 | or word ptr [ecx], 2 $sequence_2 = { c3 66830909 8d4202 5d c3 b800200000 660901 } // n = 7, score = 100 // c3 | ret // 66830909 | or word ptr [ecx], 9 // 8d4202 | lea eax, [edx + 2] // 5d | pop ebp // c3 | ret // b800200000 | mov eax, 0x2000 // 660901 | or word ptr [ecx], ax $sequence_3 = { c785e0fdffff0c000000 8db718020000 899de4fdffff c785e8fdffff01000000 68???????? 56 ff15???????? } // n = 7, score = 100 // c785e0fdffff0c000000 | mov dword ptr [ebp - 0x220], 0xc // 8db718020000 | lea esi, [edi + 0x218] // 899de4fdffff | mov dword ptr [ebp - 0x21c], ebx // c785e8fdffff01000000 | mov dword ptr [ebp - 0x218], 1 // 68???????? | // 56 | push esi // ff15???????? | $sequence_4 = { 8945e8 8945f8 8b4508 56 be???????? c745ec60664100 57 } // n = 7, score = 100 // 8945e8 | mov dword ptr [ebp - 0x18], eax // 8945f8 | mov dword ptr [ebp - 8], eax // 8b4508 | mov eax, dword ptr [ebp + 8] // 56 | push esi // be???????? | // c745ec60664100 | mov dword ptr [ebp - 0x14], 0x416660 // 57 | push edi $sequence_5 = { e8???????? 83c408 8bf0 ff7704 ff15???????? 85f6 7414 } // n = 7, score = 100 // e8???????? | // 83c408 | add esp, 8 // 8bf0 | mov esi, eax // ff7704 | push dword ptr [edi + 4] // ff15???????? | // 85f6 | test esi, esi // 7414 | je 0x16 $sequence_6 = { b802000000 833d????????00 0f8540180000 8d0d20a34100 ba1b000000 e8???????? } // n = 6, score = 100 // b802000000 | mov eax, 2 // 833d????????00 | // 0f8540180000 | jne 0x1846 // 8d0d20a34100 | lea ecx, [0x41a320] // ba1b000000 | mov edx, 0x1b // e8???????? | $sequence_7 = { 7403 50 ffd7 8b460c 5f 85c0 } // n = 6, score = 100 // 7403 | je 5 // 50 | push eax // ffd7 | call edi // 8b460c | mov eax, dword ptr [esi + 0xc] // 5f | pop edi // 85c0 | test eax, eax $sequence_8 = { 5d c3 ff15???????? 8b4dfc 85c9 } // n = 5, score = 100 // 5d | pop ebp // c3 | ret // ff15???????? | // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 85c9 | test ecx, ecx $sequence_9 = { 50 53 6802100000 ff36 ff15???????? 53 e8???????? } // n = 7, score = 100 // 50 | push eax // 53 | push ebx // 6802100000 | push 0x1002 // ff36 | push dword ptr [esi] // ff15???????? | // 53 | push ebx // e8???????? | condition: 7 of them and filesize < 294912 }
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