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 = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 8d4c2434 89542454 c784248400000001000000 66899c2488000000 e8???????? 50 } // n = 6, score = 100 // 8d4c2434 | lea ecx, dword ptr [esp + 0x34] // 89542454 | mov dword ptr [esp + 0x54], edx // c784248400000001000000 | mov dword ptr [esp + 0x84], 1 // 66899c2488000000 | mov word ptr [esp + 0x88], bx // e8???????? | // 50 | push eax $sequence_2 = { 8d4c2478 c68424dc28010002 e8???????? 8b442410 8b4c240c } // n = 5, score = 100 // 8d4c2478 | lea ecx, dword ptr [esp + 0x78] // c68424dc28010002 | mov byte ptr [esp + 0x128dc], 2 // e8???????? | // 8b442410 | mov eax, dword ptr [esp + 0x10] // 8b4c240c | mov ecx, dword ptr [esp + 0xc] $sequence_3 = { 50 ff15???????? 8b74241c 8d4c2404 51 8bce e8???????? } // n = 7, score = 100 // 50 | push eax // ff15???????? | // 8b74241c | mov esi, dword ptr [esp + 0x1c] // 8d4c2404 | lea ecx, dword ptr [esp + 4] // 51 | push ecx // 8bce | mov ecx, esi // e8???????? | $sequence_4 = { b8c8280100 64892500000000 e8???????? 53 56 8d442408 } // n = 6, score = 100 // b8c8280100 | mov eax, 0x128c8 // 64892500000000 | mov dword ptr fs:[0], esp // e8???????? | // 53 | push ebx // 56 | push esi // 8d442408 | lea eax, dword ptr [esp + 8] $sequence_5 = { 56 68???????? 8d4c2408 c744240c00000000 } // n = 4, score = 100 // 56 | push esi // 68???????? | // 8d4c2408 | lea ecx, dword ptr [esp + 8] // c744240c00000000 | mov dword ptr [esp + 0xc], 0 $sequence_6 = { e8???????? 83c404 33db 68???????? 6883000000 53 } // n = 6, score = 100 // e8???????? | // 83c404 | add esp, 4 // 33db | xor ebx, ebx // 68???????? | // 6883000000 | push 0x83 // 53 | push ebx $sequence_7 = { 6800010000 8d4c2408 c744241801000000 e8???????? 50 } // n = 5, score = 100 // 6800010000 | push 0x100 // 8d4c2408 | lea ecx, dword ptr [esp + 8] // c744241801000000 | mov dword ptr [esp + 0x18], 1 // e8???????? | // 50 | push eax condition: 7 of them and filesize < 65536 }
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