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rule win_bleachgap_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.bleachgap." 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.bleachgap" 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 = { 8b94243c010000 0fa4c215 0facdf15 c1e015 c1fb15 8bcf 2bc8 } // n = 7, score = 100 // 8b94243c010000 | mov edx, dword ptr [esp + 0x13c] // 0fa4c215 | shld edx, eax, 0x15 // 0facdf15 | shrd edi, ebx, 0x15 // c1e015 | shl eax, 0x15 // c1fb15 | sar ebx, 0x15 // 8bcf | mov ecx, edi // 2bc8 | sub ecx, eax $sequence_1 = { 8be8 6a57 68???????? 55 e8???????? 83c40c 89442414 } // n = 7, score = 100 // 8be8 | mov ebp, eax // 6a57 | push 0x57 // 68???????? | // 55 | push ebp // e8???????? | // 83c40c | add esp, 0xc // 89442414 | mov dword ptr [esp + 0x14], eax $sequence_2 = { 8b55f0 eb0a 894f24 c7432400000000 85d2 7440 8d45cc } // n = 7, score = 100 // 8b55f0 | mov edx, dword ptr [ebp - 0x10] // eb0a | jmp 0xc // 894f24 | mov dword ptr [edi + 0x24], ecx // c7432400000000 | mov dword ptr [ebx + 0x24], 0 // 85d2 | test edx, edx // 7440 | je 0x42 // 8d45cc | lea eax, [ebp - 0x34] $sequence_3 = { c745fc00000000 bf01000000 660f1f440000 c745dc74000000 c645e05a c645e100 c645e20c } // n = 7, score = 100 // c745fc00000000 | mov dword ptr [ebp - 4], 0 // bf01000000 | mov edi, 1 // 660f1f440000 | nop word ptr [eax + eax] // c745dc74000000 | mov dword ptr [ebp - 0x24], 0x74 // c645e05a | mov byte ptr [ebp - 0x20], 0x5a // c645e100 | mov byte ptr [ebp - 0x1f], 0 // c645e20c | mov byte ptr [ebp - 0x1e], 0xc $sequence_4 = { 8b4df8 8b5508 8bc2 25ff0f0000 3df00f0000 775f 660f3a63020d } // n = 7, score = 100 // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 8b5508 | mov edx, dword ptr [ebp + 8] // 8bc2 | mov eax, edx // 25ff0f0000 | and eax, 0xfff // 3df00f0000 | cmp eax, 0xff0 // 775f | ja 0x61 // 660f3a63020d | pcmpistri xmm0, xmmword ptr [edx], 0xd $sequence_5 = { e8???????? 83c408 85c0 0f8482030000 8d442418 50 6872100000 } // n = 7, score = 100 // e8???????? | // 83c408 | add esp, 8 // 85c0 | test eax, eax // 0f8482030000 | je 0x388 // 8d442418 | lea eax, [esp + 0x18] // 50 | push eax // 6872100000 | push 0x1072 $sequence_6 = { e8???????? 83c40c 85c0 0f8490030000 56 e8???????? 8bf0 } // n = 7, score = 100 // e8???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 0f8490030000 | je 0x396 // 56 | push esi // e8???????? | // 8bf0 | mov esi, eax $sequence_7 = { 8bf0 85f6 7f4d eb24 8139f6000000 7510 6a00 } // n = 7, score = 100 // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 7f4d | jg 0x4f // eb24 | jmp 0x26 // 8139f6000000 | cmp dword ptr [ecx], 0xf6 // 7510 | jne 0x12 // 6a00 | push 0 $sequence_8 = { c1c907 894c244c 8b8c2490000000 03cb 03d1 8b4c2470 8bfa } // n = 7, score = 100 // c1c907 | ror ecx, 7 // 894c244c | mov dword ptr [esp + 0x4c], ecx // 8b8c2490000000 | mov ecx, dword ptr [esp + 0x90] // 03cb | add ecx, ebx // 03d1 | add edx, ecx // 8b4c2470 | mov ecx, dword ptr [esp + 0x70] // 8bfa | mov edi, edx $sequence_9 = { c1fb15 2bc8 899c24cc000000 1bda 8b542434 03d1 8b4c2444 } // n = 7, score = 100 // c1fb15 | sar ebx, 0x15 // 2bc8 | sub ecx, eax // 899c24cc000000 | mov dword ptr [esp + 0xcc], ebx // 1bda | sbb ebx, edx // 8b542434 | mov edx, dword ptr [esp + 0x34] // 03d1 | add edx, ecx // 8b4c2444 | mov ecx, dword ptr [esp + 0x44] condition: 7 of them and filesize < 4538368 }
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