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rule win_manitsme_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.manitsme." 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.manitsme" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 8b842428010000 56 51 68???????? a3???????? } // n = 5, score = 100 // 8b842428010000 | mov eax, dword ptr [esp + 0x128] // 56 | push esi // 51 | push ecx // 68???????? | // a3???????? | $sequence_1 = { 8d442420 50 6a00 6a00 8d4c2434 51 6a00 } // n = 7, score = 100 // 8d442420 | lea eax, [esp + 0x20] // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 // 8d4c2434 | lea ecx, [esp + 0x34] // 51 | push ecx // 6a00 | push 0 $sequence_2 = { 83c404 52 ffd5 e9???????? 68bb010000 66c74424180200 } // n = 6, score = 100 // 83c404 | add esp, 4 // 52 | push edx // ffd5 | call ebp // e9???????? | // 68bb010000 | push 0x1bb // 66c74424180200 | mov word ptr [esp + 0x18], 2 $sequence_3 = { 56 6a01 89442448 6a02 8d442454 } // n = 5, score = 100 // 56 | push esi // 6a01 | push 1 // 89442448 | mov dword ptr [esp + 0x48], eax // 6a02 | push 2 // 8d442454 | lea eax, [esp + 0x54] $sequence_4 = { 56 57 6a1c c744241400000000 e8???????? } // n = 5, score = 100 // 56 | push esi // 57 | push edi // 6a1c | push 0x1c // c744241400000000 | mov dword ptr [esp + 0x14], 0 // e8???????? | $sequence_5 = { b902000000 52 bd07000000 bbb80b0000 50 c744241c10000000 890d???????? } // n = 7, score = 100 // b902000000 | mov ecx, 2 // 52 | push edx // bd07000000 | mov ebp, 7 // bbb80b0000 | mov ebx, 0xbb8 // 50 | push eax // c744241c10000000 | mov dword ptr [esp + 0x1c], 0x10 // 890d???????? | $sequence_6 = { ffd5 e9???????? 68bb010000 66c74424180200 } // n = 4, score = 100 // ffd5 | call ebp // e9???????? | // 68bb010000 | push 0x1bb // 66c74424180200 | mov word ptr [esp + 0x18], 2 $sequence_7 = { 5f 5b c9 c3 6a0a 6a00 ff74240c } // n = 7, score = 100 // 5f | pop edi // 5b | pop ebx // c9 | leave // c3 | ret // 6a0a | push 0xa // 6a00 | push 0 // ff74240c | push dword ptr [esp + 0xc] $sequence_8 = { ff15???????? 8d942440030000 8bc6 2bd6 8a08 880c02 } // n = 6, score = 100 // ff15???????? | // 8d942440030000 | lea edx, [esp + 0x340] // 8bc6 | mov eax, esi // 2bd6 | sub edx, esi // 8a08 | mov cl, byte ptr [eax] // 880c02 | mov byte ptr [edx + eax], cl $sequence_9 = { 51 687fffffff 68ffff0000 52 ff15???????? } // n = 5, score = 100 // 51 | push ecx // 687fffffff | push 0xffffff7f // 68ffff0000 | push 0xffff // 52 | push edx // ff15???????? | condition: 7 of them and filesize < 212992 }
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