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 = "2023-01-25" 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 = "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 = { 8a5c2918 895c2428 7513 8b5508 } // n = 4, score = 100 // 8a5c2918 | mov bl, byte ptr [ecx + ebp + 0x18] // 895c2428 | mov dword ptr [esp + 0x28], ebx // 7513 | jne 0x15 // 8b5508 | mov edx, dword ptr [ebp + 8] $sequence_1 = { 8d4c2408 c744241801000000 e8???????? 50 6a00 6a00 } // n = 6, score = 100 // 8d4c2408 | lea ecx, [esp + 8] // c744241801000000 | mov dword ptr [esp + 0x18], 1 // e8???????? | // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 $sequence_2 = { c68424dc28010002 e8???????? 8d4c2410 c68424dc28010001 e8???????? 8d4c2414 889c24dc280100 } // n = 7, score = 100 // c68424dc28010002 | mov byte ptr [esp + 0x128dc], 2 // e8???????? | // 8d4c2410 | lea ecx, [esp + 0x10] // c68424dc28010001 | mov byte ptr [esp + 0x128dc], 1 // e8???????? | // 8d4c2414 | lea ecx, [esp + 0x14] // 889c24dc280100 | mov byte ptr [esp + 0x128dc], bl $sequence_3 = { 53 89542448 53 53 8d4c2434 } // n = 5, score = 100 // 53 | push ebx // 89542448 | mov dword ptr [esp + 0x48], edx // 53 | push ebx // 53 | push ebx // 8d4c2434 | lea ecx, [esp + 0x34] $sequence_4 = { c3 57 56 8d4c241c e8???????? 8d4c2414 } // n = 6, score = 100 // c3 | ret // 57 | push edi // 56 | push esi // 8d4c241c | lea ecx, [esp + 0x1c] // e8???????? | // 8d4c2414 | lea ecx, [esp + 0x14] $sequence_5 = { 8b8c24d4280100 5f 5e 5b 64890d00000000 } // n = 5, score = 100 // 8b8c24d4280100 | mov ecx, dword ptr [esp + 0x128d4] // 5f | pop edi // 5e | pop esi // 5b | pop ebx // 64890d00000000 | mov dword ptr fs:[0], ecx $sequence_6 = { 2bd1 8b5c2428 8b6c242c 8d4c0201 } // n = 4, score = 100 // 2bd1 | sub edx, ecx // 8b5c2428 | mov ebx, dword ptr [esp + 0x28] // 8b6c242c | mov ebp, dword ptr [esp + 0x2c] // 8d4c0201 | lea ecx, [edx + eax + 1] $sequence_7 = { 7440 56 ff15???????? 8d4c2414 e8???????? } // n = 5, score = 100 // 7440 | je 0x42 // 56 | push esi // ff15???????? | // 8d4c2414 | lea ecx, [esp + 0x14] // e8???????? | condition: 7 of them and filesize < 65536 }
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