Actor(s): APT 30
There is no description at this point.
rule win_milkmaid_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.milkmaid." 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.milkmaid" 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 = { 7440 56 ff15???????? 8d4c2414 } // n = 4, score = 100 // 7440 | je 0x42 // 56 | push esi // ff15???????? | // 8d4c2414 | lea ecx, [esp + 0x14] $sequence_1 = { c68424dc28010002 e8???????? 8d4c2410 c68424dc28010001 } // n = 4, score = 100 // c68424dc28010002 | mov byte ptr [esp + 0x128dc], 2 // e8???????? | // 8d4c2410 | lea ecx, [esp + 0x10] // c68424dc28010001 | mov byte ptr [esp + 0x128dc], 1 $sequence_2 = { 50 53 ff15???????? 8d4c2478 c68424dc28010002 } // n = 5, score = 100 // 50 | push eax // 53 | push ebx // ff15???????? | // 8d4c2478 | lea ecx, [esp + 0x78] // c68424dc28010002 | mov byte ptr [esp + 0x128dc], 2 $sequence_3 = { 6a00 ff15???????? 6aff 8d4c2408 e8???????? 68???????? 8d4c2408 } // n = 7, score = 100 // 6a00 | push 0 // ff15???????? | // 6aff | push -1 // 8d4c2408 | lea ecx, [esp + 8] // e8???????? | // 68???????? | // 8d4c2408 | lea ecx, [esp + 8] $sequence_4 = { 895c2428 7513 8b5508 52 53 } // n = 5, score = 100 // 895c2428 | mov dword ptr [esp + 0x28], ebx // 7513 | jne 0x15 // 8b5508 | mov edx, dword ptr [ebp + 8] // 52 | push edx // 53 | push ebx $sequence_5 = { 8d442408 57 50 e8???????? 83c404 33db } // n = 6, score = 100 // 8d442408 | lea eax, [esp + 8] // 57 | push edi // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 33db | xor ebx, ebx $sequence_6 = { 8be9 896c2420 8a8528280100 84c0 7528 8b4d04 } // n = 6, score = 100 // 8be9 | mov ebp, ecx // 896c2420 | mov dword ptr [esp + 0x20], ebp // 8a8528280100 | mov al, byte ptr [ebp + 0x12828] // 84c0 | test al, al // 7528 | jne 0x2a // 8b4d04 | mov ecx, dword ptr [ebp + 4] $sequence_7 = { 51 8d8c2480000000 c68424e428010003 e8???????? b911000000 } // n = 5, score = 100 // 51 | push ecx // 8d8c2480000000 | lea ecx, [esp + 0x80] // c68424e428010003 | mov byte ptr [esp + 0x128e4], 3 // e8???????? | // b911000000 | mov ecx, 0x11 condition: 7 of them and filesize < 65536 }
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