Actor(s): Dropping Elephant
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rule win_wscspl_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.wscspl." 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.wscspl" 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 = { 2bc2 51 8bd8 e8???????? 83c404 8b74240c } // n = 6, score = 400 // 2bc2 | sub eax, edx // 51 | push ecx // 8bd8 | mov ebx, eax // e8???????? | // 83c404 | add esp, 4 // 8b74240c | mov esi, dword ptr [esp + 0xc] $sequence_1 = { 52 6a00 ff15???????? 0fb744241a } // n = 4, score = 400 // 52 | push edx // 6a00 | push 0 // ff15???????? | // 0fb744241a | movzx eax, word ptr [esp + 0x1a] $sequence_2 = { 888c0480030000 40 84c9 75ee 8d842480030000 48 } // n = 6, score = 400 // 888c0480030000 | mov byte ptr [esp + eax + 0x380], cl // 40 | inc eax // 84c9 | test cl, cl // 75ee | jne 0xfffffff0 // 8d842480030000 | lea eax, [esp + 0x380] // 48 | dec eax $sequence_3 = { 33c9 e9???????? 57 6a00 } // n = 4, score = 400 // 33c9 | xor ecx, ecx // e9???????? | // 57 | push edi // 6a00 | push 0 $sequence_4 = { 8d442430 50 6a02 ff15???????? 33c0 8d4c240c 51 } // n = 7, score = 400 // 8d442430 | lea eax, [esp + 0x30] // 50 | push eax // 6a02 | push 2 // ff15???????? | // 33c0 | xor eax, eax // 8d4c240c | lea ecx, [esp + 0xc] // 51 | push ecx $sequence_5 = { 03c9 3bc1 7702 8bc1 } // n = 4, score = 400 // 03c9 | add ecx, ecx // 3bc1 | cmp eax, ecx // 7702 | ja 4 // 8bc1 | mov eax, ecx $sequence_6 = { 81fe7c230000 7627 b885b7dce6 f7e6 c1ea0d 8bca 69d27c230000 } // n = 7, score = 400 // 81fe7c230000 | cmp esi, 0x237c // 7627 | jbe 0x29 // b885b7dce6 | mov eax, 0xe6dcb785 // f7e6 | mul esi // c1ea0d | shr edx, 0xd // 8bca | mov ecx, edx // 69d27c230000 | imul edx, edx, 0x237c $sequence_7 = { ff15???????? 6689442402 a1???????? 85c0 7419 } // n = 5, score = 400 // ff15???????? | // 6689442402 | mov word ptr [esp + 2], ax // a1???????? | // 85c0 | test eax, eax // 7419 | je 0x1b $sequence_8 = { c1ea0d 8bca 69d27c230000 8bc6 2bc2 890d???????? } // n = 6, score = 400 // c1ea0d | shr edx, 0xd // 8bca | mov ecx, edx // 69d27c230000 | imul edx, edx, 0x237c // 8bc6 | mov eax, esi // 2bc2 | sub eax, edx // 890d???????? | $sequence_9 = { e8???????? 8d4c2450 885c2c50 8b2d???????? 51 ffd5 } // n = 6, score = 400 // e8???????? | // 8d4c2450 | lea ecx, [esp + 0x50] // 885c2c50 | mov byte ptr [esp + ebp + 0x50], bl // 8b2d???????? | // 51 | push ecx // ffd5 | call ebp condition: 7 of them and filesize < 901120 }
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