Actor(s): Wekby
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rule win_roseam_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.roseam." 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.roseam" 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 = { 0f8512010000 33f6 b963000000 8dbd76ecffff 6689b574ecffff f3ab } // n = 6, score = 100 // 0f8512010000 | jne 0x118 // 33f6 | xor esi, esi // b963000000 | mov ecx, 0x63 // 8dbd76ecffff | lea edi, [ebp - 0x138a] // 6689b574ecffff | mov word ptr [ebp - 0x138c], si // f3ab | rep stosd dword ptr es:[edi], eax $sequence_1 = { 681de40a18 56 e8???????? 83c408 a3???????? 50 } // n = 6, score = 100 // 681de40a18 | push 0x180ae41d // 56 | push esi // e8???????? | // 83c408 | add esp, 8 // a3???????? | // 50 | push eax $sequence_2 = { 3bda 895df0 895508 8955f8 aa 0f8e8a040000 8b4510 } // n = 7, score = 100 // 3bda | cmp ebx, edx // 895df0 | mov dword ptr [ebp - 0x10], ebx // 895508 | mov dword ptr [ebp + 8], edx // 8955f8 | mov dword ptr [ebp - 8], edx // aa | stosb byte ptr es:[edi], al // 0f8e8a040000 | jle 0x490 // 8b4510 | mov eax, dword ptr [ebp + 0x10] $sequence_3 = { 9d 5d 58 33c0 668945fd 8845ff } // n = 6, score = 100 // 9d | popfd // 5d | pop ebp // 58 | pop eax // 33c0 | xor eax, eax // 668945fd | mov word ptr [ebp - 3], ax // 8845ff | mov byte ptr [ebp - 1], al $sequence_4 = { 50 51 52 c745fc00000000 ff15???????? 85c0 0f8504020000 } // n = 7, score = 100 // 50 | push eax // 51 | push ecx // 52 | push edx // c745fc00000000 | mov dword ptr [ebp - 4], 0 // ff15???????? | // 85c0 | test eax, eax // 0f8504020000 | jne 0x20a $sequence_5 = { 80c241 8855ff 68???????? 55 } // n = 4, score = 100 // 80c241 | add dl, 0x41 // 8855ff | mov byte ptr [ebp - 1], dl // 68???????? | // 55 | push ebp $sequence_6 = { 894df8 8b4d10 2bc8 8d5004 894d10 8b4dfc 89550c } // n = 7, score = 100 // 894df8 | mov dword ptr [ebp - 8], ecx // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 2bc8 | sub ecx, eax // 8d5004 | lea edx, [eax + 4] // 894d10 | mov dword ptr [ebp + 0x10], ecx // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 89550c | mov dword ptr [ebp + 0xc], edx $sequence_7 = { 53 56 57 8b02 8945f8 50 } // n = 6, score = 100 // 53 | push ebx // 56 | push esi // 57 | push edi // 8b02 | mov eax, dword ptr [edx] // 8945f8 | mov dword ptr [ebp - 8], eax // 50 | push eax $sequence_8 = { 58 8bc2 5f 5e } // n = 4, score = 100 // 58 | pop eax // 8bc2 | mov eax, edx // 5f | pop edi // 5e | pop esi $sequence_9 = { 668901 0fbe560c 89550c 68???????? } // n = 4, score = 100 // 668901 | mov word ptr [ecx], ax // 0fbe560c | movsx edx, byte ptr [esi + 0xc] // 89550c | mov dword ptr [ebp + 0xc], edx // 68???????? | condition: 7 of them and filesize < 221184 }
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