Actor(s): DarkHotel
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rule win_nemim_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.nemim." 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.nemim" malpedia_rule_date = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { c1f905 8d04c0 be00800000 8b0c8d40604300 } // n = 4, score = 200 // c1f905 | sar ecx, 5 // 8d04c0 | lea eax, [eax + eax*8] // be00800000 | mov esi, 0x8000 // 8b0c8d40604300 | mov ecx, dword ptr [ecx*4 + 0x436040] $sequence_1 = { 6a00 6a00 52 6801000080 ff15???????? 85c0 753f } // n = 7, score = 200 // 6a00 | push 0 // 6a00 | push 0 // 52 | push edx // 6801000080 | push 0x80000001 // ff15???????? | // 85c0 | test eax, eax // 753f | jne 0x41 $sequence_2 = { 743a 8b9c243c010000 8b2d???????? 8d4c2434 53 51 ffd5 } // n = 7, score = 200 // 743a | je 0x3c // 8b9c243c010000 | mov ebx, dword ptr [esp + 0x13c] // 8b2d???????? | // 8d4c2434 | lea ecx, [esp + 0x34] // 53 | push ebx // 51 | push ecx // ffd5 | call ebp $sequence_3 = { 56 57 55 8b0c8504744300 } // n = 4, score = 200 // 56 | push esi // 57 | push edi // 55 | push ebp // 8b0c8504744300 | mov ecx, dword ptr [eax*4 + 0x437404] $sequence_4 = { 68???????? 68???????? e8???????? 8bf8 83c408 85ff 0f84a2000000 } // n = 7, score = 200 // 68???????? | // 68???????? | // e8???????? | // 8bf8 | mov edi, eax // 83c408 | add esp, 8 // 85ff | test edi, edi // 0f84a2000000 | je 0xa8 $sequence_5 = { 8856fd 884eff 8b4c2414 c60600 } // n = 4, score = 200 // 8856fd | mov byte ptr [esi - 3], dl // 884eff | mov byte ptr [esi - 1], cl // 8b4c2414 | mov ecx, dword ptr [esp + 0x14] // c60600 | mov byte ptr [esi], 0 $sequence_6 = { 57 8b7c2410 b856555555 8d0cbd00000000 f7e9 } // n = 5, score = 200 // 57 | push edi // 8b7c2410 | mov edi, dword ptr [esp + 0x10] // b856555555 | mov eax, 0x55555556 // 8d0cbd00000000 | lea ecx, [edi*4] // f7e9 | imul ecx $sequence_7 = { 8bc5 c1e005 ff90d0a74200 83c414 8bf8 83ff01 754b } // n = 7, score = 200 // 8bc5 | mov eax, ebp // c1e005 | shl eax, 5 // ff90d0a74200 | call dword ptr [eax + 0x42a7d0] // 83c414 | add esp, 0x14 // 8bf8 | mov edi, eax // 83ff01 | cmp edi, 1 // 754b | jne 0x4d $sequence_8 = { 8d058c5e4300 83780800 754e b741 } // n = 4, score = 200 // 8d058c5e4300 | lea eax, [0x435e8c] // 83780800 | cmp dword ptr [eax + 8], 0 // 754e | jne 0x50 // b741 | mov bh, 0x41 $sequence_9 = { 68???????? 53 ff15???????? 6a5c 68???????? } // n = 5, score = 200 // 68???????? | // 53 | push ebx // ff15???????? | // 6a5c | push 0x5c // 68???????? | condition: 7 of them and filesize < 499712 }
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