Actor(s): Dropping Elephant
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rule win_wscspl_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 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 = { 8b35???????? 668b0d???????? 56 68???????? 68???????? 8935???????? } // n = 6, score = 400 // 8b35???????? | // 668b0d???????? | // 56 | push esi // 68???????? | // 68???????? | // 8935???????? | $sequence_2 = { ff15???????? ff15???????? 6888130000 ff15???????? e8???????? 8a442424 a801 } // n = 7, score = 400 // ff15???????? | // ff15???????? | // 6888130000 | push 0x1388 // ff15???????? | // e8???????? | // 8a442424 | mov al, byte ptr [esp + 0x24] // a801 | test al, 1 $sequence_3 = { 83c40c 57 e8???????? 83c404 8935???????? 8b4c2414 8b15???????? } // n = 7, score = 400 // 83c40c | add esp, 0xc // 57 | push edi // e8???????? | // 83c404 | add esp, 4 // 8935???????? | // 8b4c2414 | mov ecx, dword ptr [esp + 0x14] // 8b15???????? | $sequence_4 = { 687c230000 68c00b0000 bb???????? e8???????? } // n = 4, score = 400 // 687c230000 | push 0x237c // 68c00b0000 | push 0xbc0 // bb???????? | // e8???????? | $sequence_5 = { 5f 8935???????? 5e 5d 8b8c2488230000 } // n = 5, score = 400 // 5f | pop edi // 8935???????? | // 5e | pop esi // 5d | pop ebp // 8b8c2488230000 | mov ecx, dword ptr [esp + 0x2388] $sequence_6 = { 75f9 2bc6 50 8d8c241c010000 68???????? } // n = 5, score = 400 // 75f9 | jne 0xfffffffb // 2bc6 | sub eax, esi // 50 | push eax // 8d8c241c010000 | lea ecx, [esp + 0x11c] // 68???????? | $sequence_7 = { c3 53 50 8bcd 8d742414 } // n = 5, score = 400 // c3 | ret // 53 | push ebx // 50 | push eax // 8bcd | mov ecx, ebp // 8d742414 | lea esi, [esp + 0x14] $sequence_8 = { 8b0d???????? 03c3 56 3bc1 } // n = 4, score = 400 // 8b0d???????? | // 03c3 | add eax, ebx // 56 | push esi // 3bc1 | cmp eax, ecx $sequence_9 = { 33c9 8d5c2424 e8???????? bf7c230000 83c414 3bf7 7702 } // n = 7, score = 400 // 33c9 | xor ecx, ecx // 8d5c2424 | lea ebx, [esp + 0x24] // e8???????? | // bf7c230000 | mov edi, 0x237c // 83c414 | add esp, 0x14 // 3bf7 | cmp esi, edi // 7702 | ja 4 condition: 7 of them and filesize < 901120 }
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