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rule win_lolsnif_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 3bfb 7418 8b471c 3bc3 7411 50 53 } // n = 7, score = 200 // 3bfb | cmp edi, ebx // 7418 | je 0x1a // 8b471c | mov eax, dword ptr [edi + 0x1c] // 3bc3 | cmp eax, ebx // 7411 | je 0x13 // 50 | push eax // 53 | push ebx $sequence_1 = { e8???????? 83c40c ff75e4 e8???????? 8b45fc 5e } // n = 6, score = 200 // e8???????? | // 83c40c | add esp, 0xc // ff75e4 | push dword ptr [ebp - 0x1c] // e8???????? | // 8b45fc | mov eax, dword ptr [ebp - 4] // 5e | pop esi $sequence_2 = { 50 ffd6 83c40c 03d8 a1???????? 85c0 741b } // n = 7, score = 200 // 50 | push eax // ffd6 | call esi // 83c40c | add esp, 0xc // 03d8 | add ebx, eax // a1???????? | // 85c0 | test eax, eax // 741b | je 0x1d $sequence_3 = { ff75f0 53 ff35???????? ff15???????? b8???????? 83c9ff f00fc108 } // n = 7, score = 200 // ff75f0 | push dword ptr [ebp - 0x10] // 53 | push ebx // ff35???????? | // ff15???????? | // b8???????? | // 83c9ff | or ecx, 0xffffffff // f00fc108 | lock xadd dword ptr [eax], ecx $sequence_4 = { 72ea eb05 8364240c00 6a01 ffd6 837c240c00 7423 } // n = 7, score = 200 // 72ea | jb 0xffffffec // eb05 | jmp 7 // 8364240c00 | and dword ptr [esp + 0xc], 0 // 6a01 | push 1 // ffd6 | call esi // 837c240c00 | cmp dword ptr [esp + 0xc], 0 // 7423 | je 0x25 $sequence_5 = { 891d???????? 6a52 56 ff35???????? ff15???????? 3bc6 } // n = 6, score = 200 // 891d???????? | // 6a52 | push 0x52 // 56 | push esi // ff35???????? | // ff15???????? | // 3bc6 | cmp eax, esi $sequence_6 = { ff75f4 895df0 ff15???????? 85c0 } // n = 4, score = 200 // ff75f4 | push dword ptr [ebp - 0xc] // 895df0 | mov dword ptr [ebp - 0x10], ebx // ff15???????? | // 85c0 | test eax, eax $sequence_7 = { 8bc6 57 8bce e8???????? 8bcf 8bd6 e8???????? } // n = 7, score = 200 // 8bc6 | mov eax, esi // 57 | push edi // 8bce | mov ecx, esi // e8???????? | // 8bcf | mov ecx, edi // 8bd6 | mov edx, esi // e8???????? | $sequence_8 = { e8???????? 99 a3???????? 0bc2 8915???????? 7436 a1???????? } // n = 7, score = 200 // e8???????? | // 99 | cdq // a3???????? | // 0bc2 | or eax, edx // 8915???????? | // 7436 | je 0x38 // a1???????? | $sequence_9 = { 8d442454 ff742418 e8???????? a1???????? 83c004 50 be???????? } // n = 7, score = 200 // 8d442454 | lea eax, [esp + 0x54] // ff742418 | push dword ptr [esp + 0x18] // e8???????? | // a1???????? | // 83c004 | add eax, 4 // 50 | push eax // be???????? | condition: 7 of them and filesize < 425984 }
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