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rule win_lolsnif_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.lolsnif." 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.lolsnif" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 7532 be???????? 33c9 8bc6 41 f00fc108 6a00 } // n = 7, score = 200 // 7532 | jne 0x34 // be???????? | // 33c9 | xor ecx, ecx // 8bc6 | mov eax, esi // 41 | inc ecx // f00fc108 | lock xadd dword ptr [eax], ecx // 6a00 | push 0 $sequence_1 = { ff742408 ff36 ff15???????? ff36 8bf8 } // n = 5, score = 200 // ff742408 | push dword ptr [esp + 8] // ff36 | push dword ptr [esi] // ff15???????? | // ff36 | push dword ptr [esi] // 8bf8 | mov edi, eax $sequence_2 = { 3bc3 6817010000 1bc0 6a0a 23c6 } // n = 5, score = 200 // 3bc3 | cmp eax, ebx // 6817010000 | push 0x117 // 1bc0 | sbb eax, eax // 6a0a | push 0xa // 23c6 | and eax, esi $sequence_3 = { e8???????? 85c0 0f84e6000000 c745fc10000000 8b450c 83e00c 3c0c } // n = 7, score = 200 // e8???????? | // 85c0 | test eax, eax // 0f84e6000000 | je 0xec // c745fc10000000 | mov dword ptr [ebp - 4], 0x10 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 83e00c | and eax, 0xc // 3c0c | cmp al, 0xc $sequence_4 = { 68???????? 53 ffd6 85c0 750e 8b4d10 57 } // n = 7, score = 200 // 68???????? | // 53 | push ebx // ffd6 | call esi // 85c0 | test eax, eax // 750e | jne 0x10 // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 57 | push edi $sequence_5 = { ff742410 e8???????? e9???????? 395c2434 8b3d???????? 740e ff742434 } // n = 7, score = 200 // ff742410 | push dword ptr [esp + 0x10] // e8???????? | // e9???????? | // 395c2434 | cmp dword ptr [esp + 0x34], ebx // 8b3d???????? | // 740e | je 0x10 // ff742434 | push dword ptr [esp + 0x34] $sequence_6 = { ff35???????? e8???????? 8bd8 33ff 3bdf 0f84f9000000 } // n = 6, score = 200 // ff35???????? | // e8???????? | // 8bd8 | mov ebx, eax // 33ff | xor edi, edi // 3bdf | cmp ebx, edi // 0f84f9000000 | je 0xff $sequence_7 = { 75f1 c3 55 8bec 83ec2c 8b5010 } // n = 6, score = 200 // 75f1 | jne 0xfffffff3 // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 83ec2c | sub esp, 0x2c // 8b5010 | mov edx, dword ptr [eax + 0x10] $sequence_8 = { 85db 7414 a1???????? 351de6f90e 50 8bd3 } // n = 6, score = 200 // 85db | test ebx, ebx // 7414 | je 0x16 // a1???????? | // 351de6f90e | xor eax, 0xef9e61d // 50 | push eax // 8bd3 | mov edx, ebx $sequence_9 = { 395d14 8b3d???????? 8b1d???????? 7421 6a2c } // n = 5, score = 200 // 395d14 | cmp dword ptr [ebp + 0x14], ebx // 8b3d???????? | // 8b1d???????? | // 7421 | je 0x23 // 6a2c | push 0x2c condition: 7 of them and filesize < 425984 }
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