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rule win_poweliks_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.poweliks." 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.poweliks" 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 = { 7415 8b7d08 8b720c 81c704110000 03f7 8b7a04 03f8 } // n = 7, score = 200 // 7415 | je 0x17 // 8b7d08 | mov edi, dword ptr [ebp + 8] // 8b720c | mov esi, dword ptr [edx + 0xc] // 81c704110000 | add edi, 0x1104 // 03f7 | add esi, edi // 8b7a04 | mov edi, dword ptr [edx + 4] // 03f8 | add edi, eax $sequence_1 = { 668945aa 58 668945ac 668945ae 64a130000000 } // n = 5, score = 200 // 668945aa | mov word ptr [ebp - 0x56], ax // 58 | pop eax // 668945ac | mov word ptr [ebp - 0x54], ax // 668945ae | mov word ptr [ebp - 0x52], ax // 64a130000000 | mov eax, dword ptr fs:[0x30] $sequence_2 = { 85c0 0f8482000000 eb0b 8b5118 ebc9 } // n = 5, score = 200 // 85c0 | test eax, eax // 0f8482000000 | je 0x88 // eb0b | jmp 0xd // 8b5118 | mov edx, dword ptr [ecx + 0x18] // ebc9 | jmp 0xffffffcb $sequence_3 = { 8bcb d2e0 0ad0 88543e01 } // n = 4, score = 200 // 8bcb | mov ecx, ebx // d2e0 | shl al, cl // 0ad0 | or dl, al // 88543e01 | mov byte ptr [esi + edi + 1], dl $sequence_4 = { 8d5598 33ff 2bf2 8d147e 8a541598 32547d98 } // n = 6, score = 200 // 8d5598 | lea edx, [ebp - 0x68] // 33ff | xor edi, edi // 2bf2 | sub esi, edx // 8d147e | lea edx, [esi + edi*2] // 8a541598 | mov dl, byte ptr [ebp + edx - 0x68] // 32547d98 | xor dl, byte ptr [ebp + edi*2 - 0x68] $sequence_5 = { f7f1 8365f800 837d0c00 c645fe01 8855ff 8816 } // n = 6, score = 200 // f7f1 | div ecx // 8365f800 | and dword ptr [ebp - 8], 0 // 837d0c00 | cmp dword ptr [ebp + 0xc], 0 // c645fe01 | mov byte ptr [ebp - 2], 1 // 8855ff | mov byte ptr [ebp - 1], dl // 8816 | mov byte ptr [esi], dl $sequence_6 = { 6689459e 58 6a6c 668945a0 58 6a33 668945a2 } // n = 7, score = 200 // 6689459e | mov word ptr [ebp - 0x62], ax // 58 | pop eax // 6a6c | push 0x6c // 668945a0 | mov word ptr [ebp - 0x60], ax // 58 | pop eax // 6a33 | push 0x33 // 668945a2 | mov word ptr [ebp - 0x5e], ax $sequence_7 = { c645cc00 8b400c 53 83c00c 56 c745d04c6f6164 } // n = 6, score = 200 // c645cc00 | mov byte ptr [ebp - 0x34], 0 // 8b400c | mov eax, dword ptr [eax + 0xc] // 53 | push ebx // 83c00c | add eax, 0xc // 56 | push esi // c745d04c6f6164 | mov dword ptr [ebp - 0x30], 0x64616f4c $sequence_8 = { 8b45fc 8b5df4 03d8 8a4405d0 3a441dd0 7509 } // n = 6, score = 200 // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b5df4 | mov ebx, dword ptr [ebp - 0xc] // 03d8 | add ebx, eax // 8a4405d0 | mov al, byte ptr [ebp + eax - 0x30] // 3a441dd0 | cmp al, byte ptr [ebp + ebx - 0x30] // 7509 | jne 0xb $sequence_9 = { 3a5c0db0 7506 40 83f80f } // n = 4, score = 200 // 3a5c0db0 | cmp bl, byte ptr [ebp + ecx - 0x50] // 7506 | jne 8 // 40 | inc eax // 83f80f | cmp eax, 0xf condition: 7 of them and filesize < 115712 }
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