Actor(s): Sofacy
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rule win_downdelph_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.downdelph." 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.downdelph" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 84db 7505 8b5df0 eb47 bf01000000 } // n = 5, score = 100 // 84db | test bl, bl // 7505 | jne 7 // 8b5df0 | mov ebx, dword ptr [ebp - 0x10] // eb47 | jmp 0x49 // bf01000000 | mov edi, 1 $sequence_1 = { c645f300 eb08 43 4f 0f851dffffff } // n = 5, score = 100 // c645f300 | mov byte ptr [ebp - 0xd], 0 // eb08 | jmp 0xa // 43 | inc ebx // 4f | dec edi // 0f851dffffff | jne 0xffffff23 $sequence_2 = { 8b15???????? e8???????? 83c404 8d55ec } // n = 4, score = 100 // 8b15???????? | // e8???????? | // 83c404 | add esp, 4 // 8d55ec | lea edx, dword ptr [ebp - 0x14] $sequence_3 = { 83c404 0fb60424 59 5a 5d 5f } // n = 6, score = 100 // 83c404 | add esp, 4 // 0fb60424 | movzx eax, byte ptr [esp] // 59 | pop ecx // 5a | pop edx // 5d | pop ebp // 5f | pop edi $sequence_4 = { b001 eb69 a810 7404 33c0 } // n = 5, score = 100 // b001 | mov al, 1 // eb69 | jmp 0x6b // a810 | test al, 0x10 // 7404 | je 6 // 33c0 | xor eax, eax $sequence_5 = { 0fb64001 0145f8 8b45f8 8b5002 8955ec } // n = 5, score = 100 // 0fb64001 | movzx eax, byte ptr [eax + 1] // 0145f8 | add dword ptr [ebp - 8], eax // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8b5002 | mov edx, dword ptr [eax + 2] // 8955ec | mov dword ptr [ebp - 0x14], edx $sequence_6 = { 8d45cc 8b0d???????? 8b15???????? e8???????? } // n = 4, score = 100 // 8d45cc | lea eax, dword ptr [ebp - 0x34] // 8b0d???????? | // 8b15???????? | // e8???????? | $sequence_7 = { b301 e9???????? 68???????? 8d45d4 8b0d???????? ba???????? e8???????? } // n = 7, score = 100 // b301 | mov bl, 1 // e9???????? | // 68???????? | // 8d45d4 | lea eax, dword ptr [ebp - 0x2c] // 8b0d???????? | // ba???????? | // e8???????? | $sequence_8 = { d1e9 0f84e1fcffff 51 52 } // n = 4, score = 100 // d1e9 | shr ecx, 1 // 0f84e1fcffff | je 0xfffffce7 // 51 | push ecx // 52 | push edx $sequence_9 = { e8???????? 8b45d4 8d4de0 8d55e4 e8???????? } // n = 5, score = 100 // e8???????? | // 8b45d4 | mov eax, dword ptr [ebp - 0x2c] // 8d4de0 | lea ecx, dword ptr [ebp - 0x20] // 8d55e4 | lea edx, dword ptr [ebp - 0x1c] // e8???????? | condition: 7 of them and filesize < 172032 }
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