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rule win_darkmoon_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" version = "1" description = "Detects win.darkmoon." 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.darkmoon" malpedia_rule_date = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { 3b86b0080000 747c 8986b0080000 6804010000 } // n = 4, score = 100 // 3b86b0080000 | cmp eax, dword ptr [esi + 0x8b0] // 747c | je 0x7e // 8986b0080000 | mov dword ptr [esi + 0x8b0], eax // 6804010000 | push 0x104 $sequence_1 = { 8d8514faffff 50 ff75fc ff5669 eb57 } // n = 5, score = 100 // 8d8514faffff | lea eax, [ebp - 0x5ec] // 50 | push eax // ff75fc | push dword ptr [ebp - 4] // ff5669 | call dword ptr [esi + 0x69] // eb57 | jmp 0x59 $sequence_2 = { ff9681000000 57 8d86b2050000 50 ff96cd000000 0bc0 7506 } // n = 7, score = 100 // ff9681000000 | call dword ptr [esi + 0x81] // 57 | push edi // 8d86b2050000 | lea eax, [esi + 0x5b2] // 50 | push eax // ff96cd000000 | call dword ptr [esi + 0xcd] // 0bc0 | or eax, eax // 7506 | jne 8 $sequence_3 = { 50 e8???????? 33c0 83c404 85c0 740d 50 } // n = 7, score = 100 // 50 | push eax // e8???????? | // 33c0 | xor eax, eax // 83c404 | add esp, 4 // 85c0 | test eax, eax // 740d | je 0xf // 50 | push eax $sequence_4 = { 8d4c2418 50 51 6a00 bb00010000 68???????? 52 } // n = 7, score = 100 // 8d4c2418 | lea ecx, [esp + 0x18] // 50 | push eax // 51 | push ecx // 6a00 | push 0 // bb00010000 | mov ebx, 0x100 // 68???????? | // 52 | push edx $sequence_5 = { 56 ff96d1000000 8d8d84f0ffff 51 6a00 50 ffb7d5000000 } // n = 7, score = 100 // 56 | push esi // ff96d1000000 | call dword ptr [esi + 0xd1] // 8d8d84f0ffff | lea ecx, [ebp - 0xf7c] // 51 | push ecx // 6a00 | push 0 // 50 | push eax // ffb7d5000000 | push dword ptr [edi + 0xd5] $sequence_6 = { 51 6a00 50 ffb7d9000000 } // n = 4, score = 100 // 51 | push ecx // 6a00 | push 0 // 50 | push eax // ffb7d9000000 | push dword ptr [edi + 0xd9] $sequence_7 = { f7fb b867666666 b33a 885902 } // n = 4, score = 100 // f7fb | idiv ebx // b867666666 | mov eax, 0x66666667 // b33a | mov bl, 0x3a // 885902 | mov byte ptr [ecx + 2], bl $sequence_8 = { 83852cefffff01 80be4104000001 756e ffb52cefffff 8d8642040000 } // n = 5, score = 100 // 83852cefffff01 | add dword ptr [ebp - 0x10d4], 1 // 80be4104000001 | cmp byte ptr [esi + 0x441], 1 // 756e | jne 0x70 // ffb52cefffff | push dword ptr [ebp - 0x10d4] // 8d8642040000 | lea eax, [esi + 0x442] $sequence_9 = { 50 57 ff9681000000 8d8665010000 50 } // n = 5, score = 100 // 50 | push eax // 57 | push edi // ff9681000000 | call dword ptr [esi + 0x81] // 8d8665010000 | lea eax, [esi + 0x165] // 50 | push eax condition: 7 of them and filesize < 98304 }
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