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rule win_wpbrutebot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.wpbrutebot." 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.wpbrutebot" 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 = { c645fc89 8d8d74e9ffff e8???????? 68???????? 8bd0 c645fc8a 8d8d8ce9ffff } // n = 7, score = 100 // c645fc89 | mov byte ptr [ebp - 4], 0x89 // 8d8d74e9ffff | lea ecx, [ebp - 0x168c] // e8???????? | // 68???????? | // 8bd0 | mov edx, eax // c645fc8a | mov byte ptr [ebp - 4], 0x8a // 8d8d8ce9ffff | lea ecx, [ebp - 0x1674] $sequence_1 = { 895e70 895e74 8b8680000000 8b4068 3b86440b0000 7506 899e440b0000 } // n = 7, score = 100 // 895e70 | mov dword ptr [esi + 0x70], ebx // 895e74 | mov dword ptr [esi + 0x74], ebx // 8b8680000000 | mov eax, dword ptr [esi + 0x80] // 8b4068 | mov eax, dword ptr [eax + 0x68] // 3b86440b0000 | cmp eax, dword ptr [esi + 0xb44] // 7506 | jne 8 // 899e440b0000 | mov dword ptr [esi + 0xb44], ebx $sequence_2 = { 57 e8???????? 8937 83c40c c7877001000001000000 c7475000000000 c7475400000000 } // n = 7, score = 100 // 57 | push edi // e8???????? | // 8937 | mov dword ptr [edi], esi // 83c40c | add esp, 0xc // c7877001000001000000 | mov dword ptr [edi + 0x170], 1 // c7475000000000 | mov dword ptr [edi + 0x50], 0 // c7475400000000 | mov dword ptr [edi + 0x54], 0 $sequence_3 = { 8bec 83ec08 c745f840404e38 33c0 c645fc00 8d4809 304c05f8 } // n = 7, score = 100 // 8bec | mov ebp, esp // 83ec08 | sub esp, 8 // c745f840404e38 | mov dword ptr [ebp - 8], 0x384e4040 // 33c0 | xor eax, eax // c645fc00 | mov byte ptr [ebp - 4], 0 // 8d4809 | lea ecx, [eax + 9] // 304c05f8 | xor byte ptr [ebp + eax - 8], cl $sequence_4 = { 8d8d5cecffff e8???????? 8d8d4ceaffff c645fcb9 e8???????? 81bd9cfaffff84030000 0f83e1000000 } // n = 7, score = 100 // 8d8d5cecffff | lea ecx, [ebp - 0x13a4] // e8???????? | // 8d8d4ceaffff | lea ecx, [ebp - 0x15b4] // c645fcb9 | mov byte ptr [ebp - 4], 0xb9 // e8???????? | // 81bd9cfaffff84030000 | cmp dword ptr [ebp - 0x564], 0x384 // 0f83e1000000 | jae 0xe7 $sequence_5 = { 56 e8???????? 83c410 85c0 754e 6a00 6a00 } // n = 7, score = 100 // 56 | push esi // e8???????? | // 83c410 | add esp, 0x10 // 85c0 | test eax, eax // 754e | jne 0x50 // 6a00 | push 0 // 6a00 | push 0 $sequence_6 = { 8db1b00b0000 eb1a 8b4c2418 80b9cd0c000000 8db1b80b0000 7578 c681cd0c000001 } // n = 7, score = 100 // 8db1b00b0000 | lea esi, [ecx + 0xbb0] // eb1a | jmp 0x1c // 8b4c2418 | mov ecx, dword ptr [esp + 0x18] // 80b9cd0c000000 | cmp byte ptr [ecx + 0xccd], 0 // 8db1b80b0000 | lea esi, [ecx + 0xbb8] // 7578 | jne 0x7a // c681cd0c000001 | mov byte ptr [ecx + 0xccd], 1 $sequence_7 = { 8d4de0 e8???????? 8d8dbcfbffff e8???????? 8d8d30f9ffff e8???????? 8d8d60fdffff } // n = 7, score = 100 // 8d4de0 | lea ecx, [ebp - 0x20] // e8???????? | // 8d8dbcfbffff | lea ecx, [ebp - 0x444] // e8???????? | // 8d8d30f9ffff | lea ecx, [ebp - 0x6d0] // e8???????? | // 8d8d60fdffff | lea ecx, [ebp - 0x2a0] $sequence_8 = { b95b020000 eb0a b875000000 b957020000 51 68???????? 50 } // n = 7, score = 100 // b95b020000 | mov ecx, 0x25b // eb0a | jmp 0xc // b875000000 | mov eax, 0x75 // b957020000 | mov ecx, 0x257 // 51 | push ecx // 68???????? | // 50 | push eax $sequence_9 = { 8bec 83ec08 c745f8455f5b42 33c0 c645fc00 8d4809 304c05f8 } // n = 7, score = 100 // 8bec | mov ebp, esp // 83ec08 | sub esp, 8 // c745f8455f5b42 | mov dword ptr [ebp - 8], 0x425b5f45 // 33c0 | xor eax, eax // c645fc00 | mov byte ptr [ebp - 4], 0 // 8d4809 | lea ecx, [eax + 9] // 304c05f8 | xor byte ptr [ebp + eax - 8], cl condition: 7 of them and filesize < 5134336 }
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