Actor(s): Stone Panda
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rule win_emdivi_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.emdivi." 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.emdivi" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 59 ff75e8 8bfb 56 } // n = 4, score = 300 // 59 | pop ecx // ff75e8 | push dword ptr [ebp - 0x18] // 8bfb | mov edi, ebx // 56 | push esi $sequence_1 = { 8b4508 53 56 57 6a21 8bf1 8945e4 } // n = 7, score = 300 // 8b4508 | mov eax, dword ptr [ebp + 8] // 53 | push ebx // 56 | push esi // 57 | push edi // 6a21 | push 0x21 // 8bf1 | mov esi, ecx // 8945e4 | mov dword ptr [ebp - 0x1c], eax $sequence_2 = { e9???????? 395d08 7404 33c0 eb09 8b45e4 } // n = 6, score = 300 // e9???????? | // 395d08 | cmp dword ptr [ebp + 8], ebx // 7404 | je 6 // 33c0 | xor eax, eax // eb09 | jmp 0xb // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] $sequence_3 = { 8d4601 50 e8???????? 8bf8 8bc6 } // n = 5, score = 300 // 8d4601 | lea eax, [esi + 1] // 50 | push eax // e8???????? | // 8bf8 | mov edi, eax // 8bc6 | mov eax, esi $sequence_4 = { 8d7e44 6a08 5a 8bc7 8d4df4 } // n = 5, score = 300 // 8d7e44 | lea edi, [esi + 0x44] // 6a08 | push 8 // 5a | pop edx // 8bc7 | mov eax, edi // 8d4df4 | lea ecx, [ebp - 0xc] $sequence_5 = { 83ec30 6a00 e8???????? 8945f8 8d45f8 50 } // n = 6, score = 300 // 83ec30 | sub esp, 0x30 // 6a00 | push 0 // e8???????? | // 8945f8 | mov dword ptr [ebp - 8], eax // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax $sequence_6 = { 8d7de5 ab ab ab ab 68???????? } // n = 6, score = 300 // 8d7de5 | lea edi, [ebp - 0x1b] // ab | stosd dword ptr es:[edi], eax // ab | stosd dword ptr es:[edi], eax // ab | stosd dword ptr es:[edi], eax // ab | stosd dword ptr es:[edi], eax // 68???????? | $sequence_7 = { 50 ffd7 56 8d85ecf8ffff 50 } // n = 5, score = 300 // 50 | push eax // ffd7 | call edi // 56 | push esi // 8d85ecf8ffff | lea eax, [ebp - 0x714] // 50 | push eax $sequence_8 = { 8bfa 83e703 337df8 8b3cbb 337df4 } // n = 5, score = 300 // 8bfa | mov edi, edx // 83e703 | and edi, 3 // 337df8 | xor edi, dword ptr [ebp - 8] // 8b3cbb | mov edi, dword ptr [ebx + edi*4] // 337df4 | xor edi, dword ptr [ebp - 0xc] $sequence_9 = { 58 6a05 eb05 6a0f 58 6a0a } // n = 6, score = 300 // 58 | pop eax // 6a05 | push 5 // eb05 | jmp 7 // 6a0f | push 0xf // 58 | pop eax // 6a0a | push 0xa condition: 7 of them and filesize < 581632 }
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