Actor(s): DarkHotel
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rule win_nemim_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "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 = { 89542418 89442414 75cc 8b742418 8bcd } // n = 5, score = 200 // 89542418 | mov dword ptr [esp + 0x18], edx // 89442414 | mov dword ptr [esp + 0x14], eax // 75cc | jne 0xffffffce // 8b742418 | mov esi, dword ptr [esp + 0x18] // 8bcd | mov ecx, ebp $sequence_1 = { 56 8bf1 c1e603 3b96d0254300 0f851c010000 a1???????? 83f801 } // n = 7, score = 200 // 56 | push esi // 8bf1 | mov esi, ecx // c1e603 | shl esi, 3 // 3b96d0254300 | cmp edx, dword ptr [esi + 0x4325d0] // 0f851c010000 | jne 0x122 // a1???????? | // 83f801 | cmp eax, 1 $sequence_2 = { 884806 8b5604 c1ea18 885007 8a4e08 } // n = 5, score = 200 // 884806 | mov byte ptr [eax + 6], cl // 8b5604 | mov edx, dword ptr [esi + 4] // c1ea18 | shr edx, 0x18 // 885007 | mov byte ptr [eax + 7], dl // 8a4e08 | mov cl, byte ptr [esi + 8] $sequence_3 = { ff15???????? 8b442410 3d97010000 0f84ae000000 } // n = 4, score = 200 // ff15???????? | // 8b442410 | mov eax, dword ptr [esp + 0x10] // 3d97010000 | cmp eax, 0x197 // 0f84ae000000 | je 0xb4 $sequence_4 = { 85ff 0f84a2000000 33f6 57 e8???????? 83c404 83f8ff } // n = 7, score = 200 // 85ff | test edi, edi // 0f84a2000000 | je 0xa8 // 33f6 | xor esi, esi // 57 | push edi // e8???????? | // 83c404 | add esp, 4 // 83f8ff | cmp eax, -1 $sequence_5 = { 8bf9 f7d7 03d0 0bfa 33f8 03fd 8b6c2424 } // n = 7, score = 200 // 8bf9 | mov edi, ecx // f7d7 | not edi // 03d0 | add edx, eax // 0bfa | or edi, edx // 33f8 | xor edi, eax // 03fd | add edi, ebp // 8b6c2424 | mov ebp, dword ptr [esp + 0x24] $sequence_6 = { 53 56 ff90d0a74200 83c414 83f801 7514 8d047f } // n = 7, score = 200 // 53 | push ebx // 56 | push esi // ff90d0a74200 | call dword ptr [eax + 0x42a7d0] // 83c414 | add esp, 0x14 // 83f801 | cmp eax, 1 // 7514 | jne 0x16 // 8d047f | lea eax, dword ptr [edi + edi*2] $sequence_7 = { 397e04 7570 c7460c106f4100 c74610806f4100 c7461440704100 } // n = 5, score = 200 // 397e04 | cmp dword ptr [esi + 4], edi // 7570 | jne 0x72 // c7460c106f4100 | mov dword ptr [esi + 0xc], 0x416f10 // c74610806f4100 | mov dword ptr [esi + 0x10], 0x416f80 // c7461440704100 | mov dword ptr [esi + 0x14], 0x417040 $sequence_8 = { 51 e8???????? 682c010000 68???????? 68???????? } // n = 5, score = 200 // 51 | push ecx // e8???????? | // 682c010000 | push 0x12c // 68???????? | // 68???????? | $sequence_9 = { 33fe 33f8 03fd 8dbc396556acc4 } // n = 4, score = 200 // 33fe | xor edi, esi // 33f8 | xor edi, eax // 03fd | add edi, ebp // 8dbc396556acc4 | lea edi, dword ptr [ecx + edi - 0x3b53a99b] condition: 7 of them and filesize < 499712 }
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