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rule win_aperetif_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.aperetif." 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.aperetif" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 8d0442 0bf8 eb37 3d46080000 7324 8d78ba 33c9 } // n = 7, score = 100 // 8d0442 | lea eax, [edx + eax*2] // 0bf8 | or edi, eax // eb37 | jmp 0x39 // 3d46080000 | cmp eax, 0x846 // 7324 | jae 0x26 // 8d78ba | lea edi, [eax - 0x46] // 33c9 | xor ecx, ecx $sequence_1 = { c1e906 0fb6c9 3be9 0f8dcdfeffff 8d0ced00000000 894c2410 8d4d01 } // n = 7, score = 100 // c1e906 | shr ecx, 6 // 0fb6c9 | movzx ecx, cl // 3be9 | cmp ebp, ecx // 0f8dcdfeffff | jge 0xfffffed3 // 8d0ced00000000 | lea ecx, [ebp*8] // 894c2410 | mov dword ptr [esp + 0x10], ecx // 8d4d01 | lea ecx, [ebp + 1] $sequence_2 = { f20f10542434 dd5c2410 f20f104c2410 f20f59c1 f20f58c2 f20f11442434 8d742464 } // n = 7, score = 100 // f20f10542434 | movsd xmm2, qword ptr [esp + 0x34] // dd5c2410 | fstp qword ptr [esp + 0x10] // f20f104c2410 | movsd xmm1, qword ptr [esp + 0x10] // f20f59c1 | mulsd xmm0, xmm1 // f20f58c2 | addsd xmm0, xmm2 // f20f11442434 | movsd qword ptr [esp + 0x34], xmm0 // 8d742464 | lea esi, [esp + 0x64] $sequence_3 = { e9???????? 8b835c130000 89442414 83e0df 89835c130000 8b4e04 8b16 } // n = 7, score = 100 // e9???????? | // 8b835c130000 | mov eax, dword ptr [ebx + 0x135c] // 89442414 | mov dword ptr [esp + 0x14], eax // 83e0df | and eax, 0xffffffdf // 89835c130000 | mov dword ptr [ebx + 0x135c], eax // 8b4e04 | mov ecx, dword ptr [esi + 4] // 8b16 | mov edx, dword ptr [esi] $sequence_4 = { eb0f 85c0 b971000000 ba2a000000 0f45ca 894f04 6a00 } // n = 7, score = 100 // eb0f | jmp 0x11 // 85c0 | test eax, eax // b971000000 | mov ecx, 0x71 // ba2a000000 | mov edx, 0x2a // 0f45ca | cmovne ecx, edx // 894f04 | mov dword ptr [edi + 4], ecx // 6a00 | push 0 $sequence_5 = { e9???????? 0f57c0 0f1145d0 33ff c6869502000000 33c0 897de0 } // n = 7, score = 100 // e9???????? | // 0f57c0 | xorps xmm0, xmm0 // 0f1145d0 | movups xmmword ptr [ebp - 0x30], xmm0 // 33ff | xor edi, edi // c6869502000000 | mov byte ptr [esi + 0x295], 0 // 33c0 | xor eax, eax // 897de0 | mov dword ptr [ebp - 0x20], edi $sequence_6 = { eb02 33ed c744240c01000000 c744241000000000 c744241400000000 c74424189ec9ff7e 85f6 } // n = 7, score = 100 // eb02 | jmp 4 // 33ed | xor ebp, ebp // c744240c01000000 | mov dword ptr [esp + 0xc], 1 // c744241000000000 | mov dword ptr [esp + 0x10], 0 // c744241400000000 | mov dword ptr [esp + 0x14], 0 // c74424189ec9ff7e | mov dword ptr [esp + 0x18], 0x7effc99e // 85f6 | test esi, esi $sequence_7 = { 8b8c24ec080000 890c24 c744243000000000 c744242c00000000 53 8b9c2404090000 55 } // n = 7, score = 100 // 8b8c24ec080000 | mov ecx, dword ptr [esp + 0x8ec] // 890c24 | mov dword ptr [esp], ecx // c744243000000000 | mov dword ptr [esp + 0x30], 0 // c744242c00000000 | mov dword ptr [esp + 0x2c], 0 // 53 | push ebx // 8b9c2404090000 | mov ebx, dword ptr [esp + 0x904] // 55 | push ebp $sequence_8 = { ffd0 83c414 85c0 0f84c6010000 ff7624 ff74241c 55 } // n = 7, score = 100 // ffd0 | call eax // 83c414 | add esp, 0x14 // 85c0 | test eax, eax // 0f84c6010000 | je 0x1cc // ff7624 | push dword ptr [esi + 0x24] // ff74241c | push dword ptr [esp + 0x1c] // 55 | push ebp $sequence_9 = { eb12 85f6 74d2 b301 ebd0 8b02 8bca } // n = 7, score = 100 // eb12 | jmp 0x14 // 85f6 | test esi, esi // 74d2 | je 0xffffffd4 // b301 | mov bl, 1 // ebd0 | jmp 0xffffffd2 // 8b02 | mov eax, dword ptr [edx] // 8bca | mov ecx, edx condition: 7 of them and filesize < 10500096 }
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