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 = "2023-01-25" 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 = "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 = { b90180ffff 663bc1 750d 6a00 } // n = 4, score = 400 // b90180ffff | mov ecx, 0xffff8001 // 663bc1 | cmp ax, cx // 750d | jne 0xf // 6a00 | push 0 $sequence_1 = { 50 ff15???????? ff7508 a3???????? ffd0 5d c3 } // n = 7, score = 400 // 50 | push eax // ff15???????? | // ff7508 | push dword ptr [ebp + 8] // a3???????? | // ffd0 | call eax // 5d | pop ebp // c3 | ret $sequence_2 = { 8b75fc 5f 53 ff15???????? 8bc6 } // n = 5, score = 400 // 8b75fc | mov esi, dword ptr [ebp - 4] // 5f | pop edi // 53 | push ebx // ff15???????? | // 8bc6 | mov eax, esi $sequence_3 = { ff750c a3???????? ff7508 ffd0 } // n = 4, score = 400 // ff750c | push dword ptr [ebp + 0xc] // a3???????? | // ff7508 | push dword ptr [ebp + 8] // ffd0 | call eax $sequence_4 = { 7507 38450c 740a eb05 38450c 7503 33c0 } // n = 7, score = 400 // 7507 | jne 9 // 38450c | cmp byte ptr [ebp + 0xc], al // 740a | je 0xc // eb05 | jmp 7 // 38450c | cmp byte ptr [ebp + 0xc], al // 7503 | jne 5 // 33c0 | xor eax, eax $sequence_5 = { 6689500e 33d2 c70028000000 895010 895014 894818 89481c } // n = 7, score = 400 // 6689500e | mov word ptr [eax + 0xe], dx // 33d2 | xor edx, edx // c70028000000 | mov dword ptr [eax], 0x28 // 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 $sequence_6 = { ff15???????? 8b45fc 3bc6 7406 8b08 } // n = 5, score = 400 // ff15???????? | // 8b45fc | mov eax, dword ptr [ebp - 4] // 3bc6 | cmp eax, esi // 7406 | je 8 // 8b08 | mov ecx, dword ptr [eax] $sequence_7 = { 750d 6a00 6800010000 56 } // n = 4, score = 400 // 750d | jne 0xf // 6a00 | push 0 // 6800010000 | push 0x100 // 56 | push esi $sequence_8 = { 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_9 = { 8bec 51 68???????? ff15???????? 68???????? 50 } // n = 6, score = 400 // 8bec | mov ebp, esp // 51 | push ecx // 68???????? | // ff15???????? | // 68???????? | // 50 | push eax condition: 7 of them and filesize < 139264 }
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