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rule win_meterpreter_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.meterpreter" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 8bb914f68b45 c86a0051 8b4d0c 52 8b5508 7751 52 } // n = 7, score = 200 // 8bb914f68b45 | mov edi, dword ptr [ecx + 0x458bf614] // c86a0051 | enter 0x6a, 0x51 // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 52 | push edx // 8b5508 | mov edx, dword ptr [ebp + 8] // 7751 | ja 0x53 // 52 | push edx $sequence_1 = { 008b35a8c19f 006860 2f 0000 } // n = 4, score = 200 // 008b35a8c19f | add byte ptr [ebx - 0x603e57cb], cl // 006860 | add byte ptr [eax + 0x60], ch // 2f | das // 0000 | add byte ptr [eax], al $sequence_2 = { 55 8bec d84b08 3ddc4e0000 7d15 } // n = 5, score = 200 // 55 | push ebp // 8bec | mov ebp, esp // d84b08 | fmul dword ptr [ebx + 8] // 3ddc4e0000 | cmp eax, 0x4edc // 7d15 | jge 0x17 $sequence_3 = { 288a4b308808 8b16 40 4a 8916 7176 } // n = 6, score = 200 // 288a4b308808 | sub byte ptr [edx + 0x888304b], cl // 8b16 | mov edx, dword ptr [esi] // 40 | inc eax // 4a | dec edx // 8916 | mov dword ptr [esi], edx // 7176 | jno 0x78 $sequence_4 = { 8b4526 f7d1 49 8bf9 47 } // n = 5, score = 200 // 8b4526 | mov eax, dword ptr [ebp + 0x26] // f7d1 | not ecx // 49 | dec ecx // 8bf9 | mov edi, ecx // 47 | inc edi $sequence_5 = { d3e6 8a4d10 4e 85f9 2a7405bb a8c2 40 } // n = 7, score = 200 // d3e6 | shl esi, cl // 8a4d10 | mov cl, byte ptr [ebp + 0x10] // 4e | dec esi // 85f9 | test ecx, edi // 2a7405bb | sub dh, byte ptr [ebp + eax - 0x45] // a8c2 | test al, 0xc2 // 40 | inc eax $sequence_6 = { 8932 8b700c 83c204 4e 3bce 74ef ff9a0c8b5c03 } // n = 7, score = 200 // 8932 | mov dword ptr [edx], esi // 8b700c | mov esi, dword ptr [eax + 0xc] // 83c204 | add edx, 4 // 4e | dec esi // 3bce | cmp ecx, esi // 74ef | je 0xfffffff1 // ff9a0c8b5c03 | lcall [edx + 0x35c8b0c] $sequence_7 = { 83c410 3bf0 76e1 8bf0 } // n = 4, score = 200 // 83c410 | add esp, 0x10 // 3bf0 | cmp esi, eax // 76e1 | jbe 0xffffffe3 // 8bf0 | mov esi, eax $sequence_8 = { 884000 858840008c88 91 0093534000f4 } // n = 4, score = 200 // 884000 | mov byte ptr [eax], al // 858840008c88 | test dword ptr [eax - 0x7773ffc0], ecx // 91 | xchg eax, ecx // 0093534000f4 | add byte ptr [ebx - 0xbffbfad], dl $sequence_9 = { 01c7 05e002a800 0000 004dfc } // n = 4, score = 200 // 01c7 | add edi, eax // 05e002a800 | add eax, 0xa802e0 // 0000 | add byte ptr [eax], al // 004dfc | add byte ptr [ebp - 4], cl condition: 7 of them and filesize < 188416 }
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