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rule win_maktub_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.maktub." 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.maktub" 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 = { ffd0 f7d8 1bc0 f7d8 8be5 } // n = 5, score = 400 // ffd0 | call eax // f7d8 | neg eax // 1bc0 | sbb eax, eax // f7d8 | neg eax // 8be5 | mov esp, ebp $sequence_1 = { ff15???????? eb0a 57 6a08 } // n = 4, score = 300 // ff15???????? | // eb0a | jmp 0xc // 57 | push edi // 6a08 | push 8 $sequence_2 = { ff30 6a00 6a00 6a00 } // n = 4, score = 300 // ff30 | push dword ptr [eax] // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 $sequence_3 = { ff15???????? f6c301 0f8414010000 8d46fc } // n = 4, score = 300 // ff15???????? | // f6c301 | test bl, 1 // 0f8414010000 | je 0x11a // 8d46fc | lea eax, [esi - 4] $sequence_4 = { ff7508 ffd0 8bc8 894de8 83f9ff 7509 } // n = 6, score = 300 // ff7508 | push dword ptr [ebp + 8] // ffd0 | call eax // 8bc8 | mov ecx, eax // 894de8 | mov dword ptr [ebp - 0x18], ecx // 83f9ff | cmp ecx, -1 // 7509 | jne 0xb $sequence_5 = { ff15???????? f6c301 7432 8b75b8 } // n = 4, score = 300 // ff15???????? | // f6c301 | test bl, 1 // 7432 | je 0x34 // 8b75b8 | mov esi, dword ptr [ebp - 0x48] $sequence_6 = { ff15???????? ff75f8 ff15???????? 5f 5e b801000000 } // n = 6, score = 300 // ff15???????? | // ff75f8 | push dword ptr [ebp - 8] // ff15???????? | // 5f | pop edi // 5e | pop esi // b801000000 | mov eax, 1 $sequence_7 = { ff15???????? ff75fc 8b4320 ffd0 } // n = 4, score = 300 // ff15???????? | // ff75fc | push dword ptr [ebp - 4] // 8b4320 | mov eax, dword ptr [ebx + 0x20] // ffd0 | call eax $sequence_8 = { ff7004 ff30 e8???????? 8bc7 5f } // n = 5, score = 200 // ff7004 | push dword ptr [eax + 4] // ff30 | push dword ptr [eax] // e8???????? | // 8bc7 | mov eax, edi // 5f | pop edi $sequence_9 = { d2e1 18e1 d2d9 8a4d02 } // n = 4, score = 100 // d2e1 | shl cl, cl // 18e1 | sbb cl, ah // d2d9 | rcr cl, cl // 8a4d02 | mov cl, byte ptr [ebp + 2] $sequence_10 = { 8d8d54ffffff e8???????? 6aff 56 } // n = 4, score = 100 // 8d8d54ffffff | lea ecx, [ebp - 0xac] // e8???????? | // 6aff | push -1 // 56 | push esi $sequence_11 = { d2e0 8b4c2408 18f4 d2c0 } // n = 4, score = 100 // d2e0 | shl al, cl // 8b4c2408 | mov ecx, dword ptr [esp + 8] // 18f4 | sbb ah, dh // d2c0 | rol al, cl $sequence_12 = { 8d8d54ffffff e8???????? 8bd0 8d8d64ffffff } // n = 4, score = 100 // 8d8d54ffffff | lea ecx, [ebp - 0xac] // e8???????? | // 8bd0 | mov edx, eax // 8d8d64ffffff | lea ecx, [ebp - 0x9c] $sequence_13 = { 8d8d54ffffff e8???????? 8d4dac e8???????? } // n = 4, score = 100 // 8d8d54ffffff | lea ecx, [ebp - 0xac] // e8???????? | // 8d4dac | lea ecx, [ebp - 0x54] // e8???????? | $sequence_14 = { 8d8d5cffffff e8???????? 8d8d4cffffff e8???????? 8d8d3cffffff e8???????? } // n = 6, score = 100 // 8d8d5cffffff | lea ecx, [ebp - 0xa4] // e8???????? | // 8d8d4cffffff | lea ecx, [ebp - 0xb4] // e8???????? | // 8d8d3cffffff | lea ecx, [ebp - 0xc4] // e8???????? | $sequence_15 = { 8d8d5cffffff e8???????? 8bd0 8d8d6cffffff } // n = 4, score = 100 // 8d8d5cffffff | lea ecx, [ebp - 0xa4] // e8???????? | // 8bd0 | mov edx, eax // 8d8d6cffffff | lea ecx, [ebp - 0x94] $sequence_16 = { d2e0 20c8 d2d8 8a46ff f9 } // n = 5, score = 100 // d2e0 | shl al, cl // 20c8 | and al, cl // d2d8 | rcr al, cl // 8a46ff | mov al, byte ptr [esi - 1] // f9 | stc $sequence_17 = { 8d8d54ffffff e8???????? 8d4dc0 e8???????? 807d1800 } // n = 5, score = 100 // 8d8d54ffffff | lea ecx, [ebp - 0xac] // e8???????? | // 8d4dc0 | lea ecx, [ebp - 0x40] // e8???????? | // 807d1800 | cmp byte ptr [ebp + 0x18], 0 $sequence_18 = { d2e2 e8???????? e8???????? 0000 } // n = 4, score = 100 // d2e2 | shl dl, cl // e8???????? | // e8???????? | // 0000 | add byte ptr [eax], al $sequence_19 = { d2e0 60 e8???????? 368a02 } // n = 4, score = 100 // d2e0 | shl al, cl // 60 | pushal // e8???????? | // 368a02 | mov al, byte ptr ss:[edx] $sequence_20 = { 8d8d54ffffff e8???????? 6a01 8d4dbc e8???????? 50 8d8d64ffffff } // n = 7, score = 100 // 8d8d54ffffff | lea ecx, [ebp - 0xac] // e8???????? | // 6a01 | push 1 // 8d4dbc | lea ecx, [ebp - 0x44] // e8???????? | // 50 | push eax // 8d8d64ffffff | lea ecx, [ebp - 0x9c] $sequence_21 = { d2e2 0810 3bf7 7caf } // n = 4, score = 100 // d2e2 | shl dl, cl // 0810 | or byte ptr [eax], dl // 3bf7 | cmp esi, edi // 7caf | jl 0xffffffb1 condition: 7 of them and filesize < 3063808 }
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