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rule win_explosive_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.explosive_rat." 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.explosive_rat" 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 = { 83ec2c 53 56 57 8965f0 c745fc00000000 8d45c8 } // n = 7, score = 100 // 83ec2c | sub esp, 0x2c // 53 | push ebx // 56 | push esi // 57 | push edi // 8965f0 | mov dword ptr [ebp - 0x10], esp // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 8d45c8 | lea eax, [ebp - 0x38] $sequence_1 = { 5b 7210 8b942400010000 52 e8???????? 83c404 8b8c24b8010000 } // n = 7, score = 100 // 5b | pop ebx // 7210 | jb 0x12 // 8b942400010000 | mov edx, dword ptr [esp + 0x100] // 52 | push edx // e8???????? | // 83c404 | add esp, 4 // 8b8c24b8010000 | mov ecx, dword ptr [esp + 0x1b8] $sequence_2 = { 8b460c 50 ff15???????? 895e0c b800030000 5b c3 } // n = 7, score = 100 // 8b460c | mov eax, dword ptr [esi + 0xc] // 50 | push eax // ff15???????? | // 895e0c | mov dword ptr [esi + 0xc], ebx // b800030000 | mov eax, 0x300 // 5b | pop ebx // c3 | ret $sequence_3 = { 832600 c6460401 5e c3 8b4120 833800 7416 } // n = 7, score = 100 // 832600 | and dword ptr [esi], 0 // c6460401 | mov byte ptr [esi + 4], 1 // 5e | pop esi // c3 | ret // 8b4120 | mov eax, dword ptr [ecx + 0x20] // 833800 | cmp dword ptr [eax], 0 // 7416 | je 0x18 $sequence_4 = { 8b74240c 8b4374 8b5378 03c6 894374 8bc6 8bcf } // n = 7, score = 100 // 8b74240c | mov esi, dword ptr [esp + 0xc] // 8b4374 | mov eax, dword ptr [ebx + 0x74] // 8b5378 | mov edx, dword ptr [ebx + 0x78] // 03c6 | add eax, esi // 894374 | mov dword ptr [ebx + 0x74], eax // 8bc6 | mov eax, esi // 8bcf | mov ecx, edi $sequence_5 = { 0f857afeffff 393cb560e64500 742e a1???????? 8d70ff } // n = 5, score = 100 // 0f857afeffff | jne 0xfffffe80 // 393cb560e64500 | cmp dword ptr [esi*4 + 0x45e660], edi // 742e | je 0x30 // a1???????? | // 8d70ff | lea esi, [eax - 1] $sequence_6 = { 8b5728 51 52 ff5724 83c408 8b4628 894634 } // n = 7, score = 100 // 8b5728 | mov edx, dword ptr [edi + 0x28] // 51 | push ecx // 52 | push edx // ff5724 | call dword ptr [edi + 0x24] // 83c408 | add esp, 8 // 8b4628 | mov eax, dword ptr [esi + 0x28] // 894634 | mov dword ptr [esi + 0x34], eax $sequence_7 = { 68???????? e8???????? 83c404 b9???????? e8???????? 8d8590fdffff 50 } // n = 7, score = 100 // 68???????? | // e8???????? | // 83c404 | add esp, 4 // b9???????? | // e8???????? | // 8d8590fdffff | lea eax, [ebp - 0x270] // 50 | push eax $sequence_8 = { 7964 a802 7560 33ff 397e08 7507 56 } // n = 7, score = 100 // 7964 | jns 0x66 // a802 | test al, 2 // 7560 | jne 0x62 // 33ff | xor edi, edi // 397e08 | cmp dword ptr [esi + 8], edi // 7507 | jne 9 // 56 | push esi $sequence_9 = { 8b0d???????? 51 ff15???????? 8bf0 8975c0 33c0 3bf0 } // n = 7, score = 100 // 8b0d???????? | // 51 | push ecx // ff15???????? | // 8bf0 | mov esi, eax // 8975c0 | mov dword ptr [ebp - 0x40], esi // 33c0 | xor eax, eax // 3bf0 | cmp esi, eax condition: 7 of them and filesize < 855040 }
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