Actor(s): TeleBots
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rule win_credraptor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.credraptor." 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.credraptor" 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 = { eb18 8b0d???????? 890f 8b15???????? 895704 c74708ffffffff 8d4630 } // n = 7, score = 100 // eb18 | jmp 0x1a // 8b0d???????? | // 890f | mov dword ptr [edi], ecx // 8b15???????? | // 895704 | mov dword ptr [edi + 4], edx // c74708ffffffff | mov dword ptr [edi + 8], 0xffffffff // 8d4630 | lea eax, [esi + 0x30] $sequence_1 = { c74310ffffffff 8bcb e8???????? 5f 5e 32c0 5b } // n = 7, score = 100 // c74310ffffffff | mov dword ptr [ebx + 0x10], 0xffffffff // 8bcb | mov ecx, ebx // e8???????? | // 5f | pop edi // 5e | pop esi // 32c0 | xor al, al // 5b | pop ebx $sequence_2 = { e8???????? 8b53c8 83c410 897db8 e9???????? 8b45b8 85c0 } // n = 7, score = 100 // e8???????? | // 8b53c8 | mov edx, dword ptr [ebx - 0x38] // 83c410 | add esp, 0x10 // 897db8 | mov dword ptr [ebp - 0x48], edi // e9???????? | // 8b45b8 | mov eax, dword ptr [ebp - 0x48] // 85c0 | test eax, eax $sequence_3 = { 8d642400 8b01 85c0 7406 80780900 754a 42 } // n = 7, score = 100 // 8d642400 | lea esp, [esp] // 8b01 | mov eax, dword ptr [ecx] // 85c0 | test eax, eax // 7406 | je 8 // 80780900 | cmp byte ptr [eax + 9], 0 // 754a | jne 0x4c // 42 | inc edx $sequence_4 = { be01000000 84c0 741a 90 3c3a 7415 0fb6c0 } // n = 7, score = 100 // be01000000 | mov esi, 1 // 84c0 | test al, al // 741a | je 0x1c // 90 | nop // 3c3a | cmp al, 0x3a // 7415 | je 0x17 // 0fb6c0 | movzx eax, al $sequence_5 = { c6039a 894308 c60000 c7431801000000 894b2c 89531c 66897b20 } // n = 7, score = 100 // c6039a | mov byte ptr [ebx], 0x9a // 894308 | mov dword ptr [ebx + 8], eax // c60000 | mov byte ptr [eax], 0 // c7431801000000 | mov dword ptr [ebx + 0x18], 1 // 894b2c | mov dword ptr [ebx + 0x2c], ecx // 89531c | mov dword ptr [ebx + 0x1c], edx // 66897b20 | mov word ptr [ebx + 0x20], di $sequence_6 = { e8???????? 6a01 6a00 6a61 8bf3 e8???????? 8b4d08 } // n = 7, score = 100 // e8???????? | // 6a01 | push 1 // 6a00 | push 0 // 6a61 | push 0x61 // 8bf3 | mov esi, ebx // e8???????? | // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_7 = { dfe0 f6c444 7b1b 83ec08 dd1c24 68???????? 8d4dc8 } // n = 7, score = 100 // dfe0 | fnstsw ax // f6c444 | test ah, 0x44 // 7b1b | jnp 0x1d // 83ec08 | sub esp, 8 // dd1c24 | fstp qword ptr [esp] // 68???????? | // 8d4dc8 | lea ecx, [ebp - 0x38] $sequence_8 = { e8???????? 53 e8???????? 83c408 68918f0000 ff15???????? 8b8d64ffffff } // n = 7, score = 100 // e8???????? | // 53 | push ebx // e8???????? | // 83c408 | add esp, 8 // 68918f0000 | push 0x8f91 // ff15???????? | // 8b8d64ffffff | mov ecx, dword ptr [ebp - 0x9c] $sequence_9 = { b8abaaaaaa f7e2 8b45f0 49 81e1ffff0000 c1ea02 41 } // n = 7, score = 100 // b8abaaaaaa | mov eax, 0xaaaaaaab // f7e2 | mul edx // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 49 | dec ecx // 81e1ffff0000 | and ecx, 0xffff // c1ea02 | shr edx, 2 // 41 | inc ecx condition: 7 of them and filesize < 1728512 }
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