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rule win_safenet_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.safenet." 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.safenet" 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 = { 56 ff15???????? 85c0 7409 e8???????? 33c0 } // n = 6, score = 100 // 56 | push esi // ff15???????? | // 85c0 | test eax, eax // 7409 | je 0xb // e8???????? | // 33c0 | xor eax, eax $sequence_1 = { 56 be???????? 57 56 83cbff e8???????? } // n = 6, score = 100 // 56 | push esi // be???????? | // 57 | push edi // 56 | push esi // 83cbff | or ebx, 0xffffffff // e8???????? | $sequence_2 = { e8???????? 83c410 eb25 0fb7c1 50 ff75e8 } // n = 6, score = 100 // e8???????? | // 83c410 | add esp, 0x10 // eb25 | jmp 0x27 // 0fb7c1 | movzx eax, cx // 50 | push eax // ff75e8 | push dword ptr [ebp - 0x18] $sequence_3 = { 8d85a8f9ffff 53 50 ffd6 8d85a8f9ffff } // n = 5, score = 100 // 8d85a8f9ffff | lea eax, [ebp - 0x658] // 53 | push ebx // 50 | push eax // ffd6 | call esi // 8d85a8f9ffff | lea eax, [ebp - 0x658] $sequence_4 = { ff7008 ff7604 ff15???????? 8bcf e8???????? } // n = 5, score = 100 // ff7008 | push dword ptr [eax + 8] // ff7604 | push dword ptr [esi + 4] // ff15???????? | // 8bcf | mov ecx, edi // e8???????? | $sequence_5 = { 66f7d9 1bc9 f7d1 23c1 c3 833d????????00 } // n = 6, score = 100 // 66f7d9 | neg cx // 1bc9 | sbb ecx, ecx // f7d1 | not ecx // 23c1 | and eax, ecx // c3 | ret // 833d????????00 | $sequence_6 = { 8b4e08 8945e0 8b4650 50 } // n = 4, score = 100 // 8b4e08 | mov ecx, dword ptr [esi + 8] // 8945e0 | mov dword ptr [ebp - 0x20], eax // 8b4650 | mov eax, dword ptr [esi + 0x50] // 50 | push eax $sequence_7 = { ff75f0 ff15???????? ff75ac ff15???????? 807d1700 7509 } // n = 6, score = 100 // ff75f0 | push dword ptr [ebp - 0x10] // ff15???????? | // ff75ac | push dword ptr [ebp - 0x54] // ff15???????? | // 807d1700 | cmp byte ptr [ebp + 0x17], 0 // 7509 | jne 0xb $sequence_8 = { 59 50 8d85a4fdffff 50 } // n = 4, score = 100 // 59 | pop ecx // 50 | push eax // 8d85a4fdffff | lea eax, [ebp - 0x25c] // 50 | push eax $sequence_9 = { bb00000100 7404 0fb75df2 668b4de6 6685c9 } // n = 5, score = 100 // bb00000100 | mov ebx, 0x10000 // 7404 | je 6 // 0fb75df2 | movzx ebx, word ptr [ebp - 0xe] // 668b4de6 | mov cx, word ptr [ebp - 0x1a] // 6685c9 | test cx, cx condition: 7 of them and filesize < 262144 }
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