Actor(s): Lazarus Group
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rule win_slickshoes_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.slickshoes." 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.slickshoes" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { b801000000 330f 89ef 01fa 81f200080000 81c704000000 210f } // n = 7, score = 100 // b801000000 | mov eax, 1 // 330f | xor ecx, dword ptr [edi] // 89ef | mov edi, ebp // 01fa | add edx, edi // 81f200080000 | xor edx, 0x800 // 81c704000000 | add edi, 4 // 210f | and dword ptr [edi], ecx $sequence_1 = { e9???????? 890c24 b931fb9f7a 41 68b961a760 893c24 bf01000000 } // n = 7, score = 100 // e9???????? | // 890c24 | mov dword ptr [esp], ecx // b931fb9f7a | mov ecx, 0x7a9ffb31 // 41 | inc ecx // 68b961a760 | push 0x60a761b9 // 893c24 | mov dword ptr [esp], edi // bf01000000 | mov edi, 1 $sequence_2 = { 83c404 8b3424 83c404 29c6 8b0424 83c404 c1ee03 } // n = 7, score = 100 // 83c404 | add esp, 4 // 8b3424 | mov esi, dword ptr [esp] // 83c404 | add esp, 4 // 29c6 | sub esi, eax // 8b0424 | mov eax, dword ptr [esp] // 83c404 | add esp, 4 // c1ee03 | shr esi, 3 $sequence_3 = { e9???????? 01da ff3424 5b 57 89e7 81c704000000 } // n = 7, score = 100 // e9???????? | // 01da | add edx, ebx // ff3424 | push dword ptr [esp] // 5b | pop ebx // 57 | push edi // 89e7 | mov edi, esp // 81c704000000 | add edi, 4 $sequence_4 = { e9???????? 81c104000000 83e904 870c24 5c 890424 51 } // n = 7, score = 100 // e9???????? | // 81c104000000 | add ecx, 4 // 83e904 | sub ecx, 4 // 870c24 | xchg dword ptr [esp], ecx // 5c | pop esp // 890424 | mov dword ptr [esp], eax // 51 | push ecx $sequence_5 = { e9???????? 891424 68d546da15 5a 81c292d34f67 81f2a3e5b97f c1ea08 } // n = 7, score = 100 // e9???????? | // 891424 | mov dword ptr [esp], edx // 68d546da15 | push 0x15da46d5 // 5a | pop edx // 81c292d34f67 | add edx, 0x674fd392 // 81f2a3e5b97f | xor edx, 0x7fb9e5a3 // c1ea08 | shr edx, 8 $sequence_6 = { e9???????? 81c704000000 81c704000000 873c24 5c 686527a67e 890424 } // n = 7, score = 100 // e9???????? | // 81c704000000 | add edi, 4 // 81c704000000 | add edi, 4 // 873c24 | xchg dword ptr [esp], edi // 5c | pop esp // 686527a67e | push 0x7ea62765 // 890424 | mov dword ptr [esp], eax $sequence_7 = { e9???????? 58 48 05d0ddfe7f 2597e1577e 53 bbb1d3467e } // n = 7, score = 100 // e9???????? | // 58 | pop eax // 48 | dec eax // 05d0ddfe7f | add eax, 0x7ffeddd0 // 2597e1577e | and eax, 0x7e57e197 // 53 | push ebx // bbb1d3467e | mov ebx, 0x7e46d3b1 $sequence_8 = { e9???????? 8b2424 81c604000000 51 680ddcdb7f 59 81e9d2a9aa37 } // n = 7, score = 100 // e9???????? | // 8b2424 | mov esp, dword ptr [esp] // 81c604000000 | add esi, 4 // 51 | push ecx // 680ddcdb7f | push 0x7fdbdc0d // 59 | pop ecx // 81e9d2a9aa37 | sub ecx, 0x37aaa9d2 $sequence_9 = { ffd0 c68516340b1254 b8f4be4eff 52 890424 e9???????? 313424 } // n = 7, score = 100 // ffd0 | call eax // c68516340b1254 | mov byte ptr [ebp + 0x120b3416], 0x54 // b8f4be4eff | mov eax, 0xff4ebef4 // 52 | push edx // 890424 | mov dword ptr [esp], eax // e9???????? | // 313424 | xor dword ptr [esp], esi condition: 7 of them and filesize < 11198464 }
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