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rule win_meterpreter_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.meterpreter." 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.meterpreter" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { e22b e5f6 4f 1c8b } // n = 4, score = 200 // e22b | loop 0x2d // e5f6 | in eax, 0xf6 // 4f | dec edi // 1c8b | sbb al, 0x8b $sequence_1 = { 90 90 90 55 e4ec 53 8b22 } // n = 7, score = 200 // 90 | nop // 90 | nop // 90 | nop // 55 | push ebp // e4ec | in al, 0xec // 53 | push ebx // 8b22 | mov esp, dword ptr [edx] $sequence_2 = { 50 686cd4408e ffd6 8b0d???????? 83c18a } // n = 5, score = 200 // 50 | push eax // 686cd4408e | push 0x8e40d46c // ffd6 | call esi // 8b0d???????? | // 83c18a | add ecx, -0x76 $sequence_3 = { 008b35a8c19f 006860 2f 0000 52 ffd6 } // n = 6, score = 200 // 008b35a8c19f | add byte ptr [ebx - 0x603e57cb], cl // 006860 | add byte ptr [eax + 0x60], ch // 2f | das // 0000 | add byte ptr [eax], al // 52 | push edx // ffd6 | call esi $sequence_4 = { 8b87047945f4 6a01 50 52 c745fc00000000 ff08 98 } // n = 7, score = 200 // 8b87047945f4 | mov eax, dword ptr [edi - 0xbba86fc] // 6a01 | push 1 // 50 | push eax // 52 | push edx // c745fc00000000 | mov dword ptr [ebp - 4], 0 // ff08 | dec dword ptr [eax] // 98 | cwde $sequence_5 = { 57 40 388bf083c4cf 86f6 } // n = 4, score = 200 // 57 | push edi // 40 | inc eax // 388bf083c4cf | cmp byte ptr [ebx - 0x303b7c10], cl // 86f6 | xchg dh, dh $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 = { 043b 8801 41 0fc2049088 0135???????? 4f 75b5 } // n = 7, score = 200 // 043b | add al, 0x3b // 8801 | mov byte ptr [ecx], al // 41 | inc ecx // 0fc2049088 | cmpps xmm0, xmmword ptr [eax + edx*4], 0x88 // 0135???????? | // 4f | dec edi // 75b5 | jne 0xffffffb7 $sequence_8 = { 6c 50 048b 55 1491 48 } // n = 6, score = 200 // 6c | insb byte ptr es:[edi], dx // 50 | push eax // 048b | add al, 0x8b // 55 | push ebp // 1491 | adc al, 0x91 // 48 | dec eax $sequence_9 = { 76e1 8bf0 85f6 750e } // n = 4, score = 200 // 76e1 | jbe 0xffffffe3 // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 750e | jne 0x10 condition: 7 of them and filesize < 188416 }
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