Actor(s): Magic Hound, Rocket Kitten
There is no description at this point.
rule win_mpkbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.mpkbot." 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.mpkbot" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { ff15???????? 8b45fc 3bc6 7406 8b08 50 ff5108 } // n = 7, score = 400 // ff15???????? | // 8b45fc | mov eax, dword ptr [ebp - 4] // 3bc6 | cmp eax, esi // 7406 | je 8 // 8b08 | mov ecx, dword ptr [eax] // 50 | push eax // ff5108 | call dword ptr [ecx + 8] $sequence_1 = { 56 56 68???????? 8975f4 8b08 50 ff510c } // n = 7, score = 400 // 56 | push esi // 56 | push esi // 68???????? | // 8975f4 | mov dword ptr [ebp - 0xc], esi // 8b08 | mov ecx, dword ptr [eax] // 50 | push eax // ff510c | call dword ptr [ecx + 0xc] $sequence_2 = { 807e1100 7604 c6461100 57 } // n = 4, score = 400 // 807e1100 | cmp byte ptr [esi + 0x11], 0 // 7604 | jbe 6 // c6461100 | mov byte ptr [esi + 0x11], 0 // 57 | push edi $sequence_3 = { a3???????? 8d45fc 50 683f000f00 6a00 } // n = 5, score = 400 // a3???????? | // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // 683f000f00 | push 0xf003f // 6a00 | push 0 $sequence_4 = { 8b1d???????? ffd3 6a00 56 68???????? 68???????? } // n = 6, score = 400 // 8b1d???????? | // ffd3 | call ebx // 6a00 | push 0 // 56 | push esi // 68???????? | // 68???????? | $sequence_5 = { ffe0 55 8bec 68???????? ff15???????? } // n = 5, score = 400 // ffe0 | jmp eax // 55 | push ebp // 8bec | mov ebp, esp // 68???????? | // ff15???????? | $sequence_6 = { 6a18 5a 6689500e 33d2 } // n = 4, score = 400 // 6a18 | push 0x18 // 5a | pop edx // 6689500e | mov word ptr [eax + 0xe], dx // 33d2 | xor edx, edx $sequence_7 = { c3 55 8bec 33c0 384508 7507 } // n = 6, score = 400 // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 33c0 | xor eax, eax // 384508 | cmp byte ptr [ebp + 8], al // 7507 | jne 9 $sequence_8 = { 50 68???????? 6a0d ff15???????? 8b35???????? eb14 8d45e4 } // n = 7, score = 400 // 50 | push eax // 68???????? | // 6a0d | push 0xd // ff15???????? | // 8b35???????? | // eb14 | jmp 0x16 // 8d45e4 | lea eax, [ebp - 0x1c] $sequence_9 = { 895010 895014 894818 89481c 895020 895024 } // n = 6, score = 400 // 895010 | mov dword ptr [eax + 0x10], edx // 895014 | mov dword ptr [eax + 0x14], edx // 894818 | mov dword ptr [eax + 0x18], ecx // 89481c | mov dword ptr [eax + 0x1c], ecx // 895020 | mov dword ptr [eax + 0x20], edx // 895024 | mov dword ptr [eax + 0x24], edx condition: 7 of them and filesize < 139264 }
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