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rule win_phobos_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.phobos" 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 = { 57 ff15???????? 8906 3bc7 7427 57 ff36 } // n = 7, score = 100 // 57 | push edi // ff15???????? | // 8906 | mov dword ptr [esi], eax // 3bc7 | cmp eax, edi // 7427 | je 0x29 // 57 | push edi // ff36 | push dword ptr [esi] $sequence_1 = { 59 6a14 8d4304 50 57 e8???????? } // n = 6, score = 100 // 59 | pop ecx // 6a14 | push 0x14 // 8d4304 | lea eax, [ebx + 4] // 50 | push eax // 57 | push edi // e8???????? | $sequence_2 = { ff7508 ffd0 ff75f8 57 e8???????? 59 } // n = 6, score = 100 // ff7508 | push dword ptr [ebp + 8] // ffd0 | call eax // ff75f8 | push dword ptr [ebp - 8] // 57 | push edi // e8???????? | // 59 | pop ecx $sequence_3 = { 0f85b3000000 57 8d44242c 50 be08020000 56 } // n = 6, score = 100 // 0f85b3000000 | jne 0xb9 // 57 | push edi // 8d44242c | lea eax, [esp + 0x2c] // 50 | push eax // be08020000 | mov esi, 0x208 // 56 | push esi $sequence_4 = { 8945e4 85c0 0f84c2000000 bf???????? be04010000 } // n = 5, score = 100 // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 85c0 | test eax, eax // 0f84c2000000 | je 0xc8 // bf???????? | // be04010000 | mov esi, 0x104 $sequence_5 = { 8b450c 83c414 85c0 7408 8b0e 8b4c3908 } // n = 6, score = 100 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 83c414 | add esp, 0x14 // 85c0 | test eax, eax // 7408 | je 0xa // 8b0e | mov ecx, dword ptr [esi] // 8b4c3908 | mov ecx, dword ptr [ecx + edi + 8] $sequence_6 = { eb05 ff74bc3c 4f ff15???????? 3bfb 75f1 } // n = 6, score = 100 // eb05 | jmp 7 // ff74bc3c | push dword ptr [esp + edi*4 + 0x3c] // 4f | dec edi // ff15???????? | // 3bfb | cmp edi, ebx // 75f1 | jne 0xfffffff3 $sequence_7 = { 333c95d0b14000 8b55fc c1ea08 c1eb10 23d0 8b1495d0ad4000 23d8 } // n = 7, score = 100 // 333c95d0b14000 | xor edi, dword ptr [edx*4 + 0x40b1d0] // 8b55fc | mov edx, dword ptr [ebp - 4] // c1ea08 | shr edx, 8 // c1eb10 | shr ebx, 0x10 // 23d0 | and edx, eax // 8b1495d0ad4000 | mov edx, dword ptr [edx*4 + 0x40add0] // 23d8 | and ebx, eax $sequence_8 = { e8???????? be???????? 8d7c2428 a5 a5 a5 } // n = 6, score = 100 // e8???????? | // be???????? | // 8d7c2428 | lea edi, [esp + 0x28] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] $sequence_9 = { 7703 83c020 c3 55 8bec 57 ff7508 } // n = 7, score = 100 // 7703 | ja 5 // 83c020 | add eax, 0x20 // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 57 | push edi // ff7508 | push dword ptr [ebp + 8] condition: 7 of them and filesize < 139264 }
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