Actor(s): Tick
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rule win_lilith_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.lilith." 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.lilith" 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 = { 8b55e8 8b0485a84b4300 f644022880 74a9 807dff02 7417 } // n = 6, score = 200 // 8b55e8 | mov edx, dword ptr [ebp - 0x18] // 8b0485a84b4300 | mov eax, dword ptr [eax*4 + 0x434ba8] // f644022880 | test byte ptr [edx + eax + 0x28], 0x80 // 74a9 | je 0xffffffab // 807dff02 | cmp byte ptr [ebp - 1], 2 // 7417 | je 0x19 $sequence_1 = { 837de800 0f8480000000 8b4df8 6a0a 8b048da84b4300 } // n = 5, score = 200 // 837de800 | cmp dword ptr [ebp - 0x18], 0 // 0f8480000000 | je 0x86 // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 6a0a | push 0xa // 8b048da84b4300 | mov eax, dword ptr [ecx*4 + 0x434ba8] $sequence_2 = { 8bc1 8b4d08 894df0 8d4df8 51 } // n = 5, score = 200 // 8bc1 | mov eax, ecx // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 894df0 | mov dword ptr [ebp - 0x10], ecx // 8d4df8 | lea ecx, [ebp - 8] // 51 | push ecx $sequence_3 = { 6880000000 8d8564ffffff c78560ffffff00000000 6a00 } // n = 4, score = 200 // 6880000000 | push 0x80 // 8d8564ffffff | lea eax, [ebp - 0x9c] // c78560ffffff00000000 | mov dword ptr [ebp - 0xa0], 0 // 6a00 | push 0 $sequence_4 = { 32dc 326c3974 397c3984 398c3994399c39 } // n = 4, score = 200 // 32dc | xor bl, ah // 326c3974 | xor ch, byte ptr [ecx + edi + 0x74] // 397c3984 | cmp dword ptr [ecx + edi - 0x7c], edi // 398c3994399c39 | cmp dword ptr [ecx + edi + 0x399c3994], ecx $sequence_5 = { 8d7e90 8b4004 c744309048ef4200 8b07 8b4804 8d4190 } // n = 6, score = 200 // 8d7e90 | lea edi, [esi - 0x70] // 8b4004 | mov eax, dword ptr [eax + 4] // c744309048ef4200 | mov dword ptr [eax + esi - 0x70], 0x42ef48 // 8b07 | mov eax, dword ptr [edi] // 8b4804 | mov ecx, dword ptr [eax + 4] // 8d4190 | lea eax, [ecx - 0x70] $sequence_6 = { eb12 0c80 88441628 8b0cbda84b4300 } // n = 4, score = 200 // eb12 | jmp 0x14 // 0c80 | or al, 0x80 // 88441628 | mov byte ptr [esi + edx + 0x28], al // 8b0cbda84b4300 | mov ecx, dword ptr [edi*4 + 0x434ba8] $sequence_7 = { 33c9 8bc1 3914c5e0864200 7408 40 } // n = 5, score = 200 // 33c9 | xor ecx, ecx // 8bc1 | mov eax, ecx // 3914c5e0864200 | cmp dword ptr [eax*8 + 0x4286e0], edx // 7408 | je 0xa // 40 | inc eax $sequence_8 = { 6bc830 8b0495a84b4300 8a440828 a848 7404 33c0 } // n = 6, score = 200 // 6bc830 | imul ecx, eax, 0x30 // 8b0495a84b4300 | mov eax, dword ptr [edx*4 + 0x434ba8] // 8a440828 | mov al, byte ptr [eax + ecx + 0x28] // a848 | test al, 0x48 // 7404 | je 6 // 33c0 | xor eax, eax $sequence_9 = { 7553 e8???????? 89049da84b4300 85c0 742f } // n = 5, score = 200 // 7553 | jne 0x55 // e8???????? | // 89049da84b4300 | mov dword ptr [ebx*4 + 0x434ba8], eax // 85c0 | test eax, eax // 742f | je 0x31 condition: 7 of them and filesize < 499712 }
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