Actor(s): Tick
There is no description at this point.
rule win_xxmm_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.xxmm." 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.xxmm" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 6a00 ff15???????? 53 57 50 8945fc e8???????? } // n = 7, score = 600 // 6a00 | push 0 // ff15???????? | // 53 | push ebx // 57 | push edi // 50 | push eax // 8945fc | mov dword ptr [ebp - 4], eax // e8???????? | $sequence_1 = { 6a00 ff55ec ff7650 8bf8 } // n = 4, score = 600 // 6a00 | push 0 // ff55ec | call dword ptr [ebp - 0x14] // ff7650 | push dword ptr [esi + 0x50] // 8bf8 | mov edi, eax $sequence_2 = { 8b7c0e20 8b440e24 03f9 03c1 } // n = 4, score = 600 // 8b7c0e20 | mov edi, dword ptr [esi + ecx + 0x20] // 8b440e24 | mov eax, dword ptr [esi + ecx + 0x24] // 03f9 | add edi, ecx // 03c1 | add eax, ecx $sequence_3 = { 897d10 3bdf 7673 8b4508 2bc6 } // n = 5, score = 600 // 897d10 | mov dword ptr [ebp + 0x10], edi // 3bdf | cmp ebx, edi // 7673 | jbe 0x75 // 8b4508 | mov eax, dword ptr [ebp + 8] // 2bc6 | sub eax, esi $sequence_4 = { c3 55 8bec 51 51 8b03 8b08 } // n = 7, score = 600 // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 51 | push ecx // 51 | push ecx // 8b03 | mov eax, dword ptr [ebx] // 8b08 | mov ecx, dword ptr [eax] $sequence_5 = { 0f84bc000000 397d10 0f84b3000000 3bf7 } // n = 4, score = 600 // 0f84bc000000 | je 0xc2 // 397d10 | cmp dword ptr [ebp + 0x10], edi // 0f84b3000000 | je 0xb9 // 3bf7 | cmp esi, edi $sequence_6 = { 034df8 83c0f8 d1e8 8d7a08 897df4 7450 } // n = 6, score = 600 // 034df8 | add ecx, dword ptr [ebp - 8] // 83c0f8 | add eax, -8 // d1e8 | shr eax, 1 // 8d7a08 | lea edi, [edx + 8] // 897df4 | mov dword ptr [ebp - 0xc], edi // 7450 | je 0x52 $sequence_7 = { 0fb74606 8945e8 85c0 7429 8b47f8 } // n = 5, score = 600 // 0fb74606 | movzx eax, word ptr [esi + 6] // 8945e8 | mov dword ptr [ebp - 0x18], eax // 85c0 | test eax, eax // 7429 | je 0x2b // 8b47f8 | mov eax, dword ptr [edi - 8] $sequence_8 = { 3b7114 7303 8bc6 c3 53 0fb75806 57 } // n = 7, score = 600 // 3b7114 | cmp esi, dword ptr [ecx + 0x14] // 7303 | jae 5 // 8bc6 | mov eax, esi // c3 | ret // 53 | push ebx // 0fb75806 | movzx ebx, word ptr [eax + 6] // 57 | push edi $sequence_9 = { 41 4a 75f7 8b5dfc 83c728 837de800 75d7 } // n = 7, score = 600 // 41 | inc ecx // 4a | dec edx // 75f7 | jne 0xfffffff9 // 8b5dfc | mov ebx, dword ptr [ebp - 4] // 83c728 | add edi, 0x28 // 837de800 | cmp dword ptr [ebp - 0x18], 0 // 75d7 | jne 0xffffffd9 condition: 7 of them and filesize < 540672 }
rule win_xxmm_w0 { meta: author = "Florian Roth" description = "Detects malware / hacktool sample from Bronze Butler incident" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.xxmm" malpedia_version = "20180301" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $x1 = "\\Release\\ReflectivLoader.pdb" ascii $x3 = "\\Projects\\xxmm2\\Release\\" ascii $x5 = "http://127.0.0.1/phptunnel.php" fullword ascii $s1 = "xxmm2.exe" fullword ascii $s2 = "\\AvUpdate.exe" fullword wide $s3 = "stdapi_fs_file_download" fullword ascii $s4 = "stdapi_syncshell_open" fullword ascii $s5 = "stdapi_execute_sleep" fullword ascii $s6 = "stdapi_syncshell_kill" fullword ascii condition: 1 of ($x*) or 4 of them }
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