Some Ransomware distributed by TA547 in Australia
rule win_adhubllka_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.adhubllka." 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.adhubllka" 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 = { e8???????? 8d8d60ffffff e8???????? 0f108560ffffff be18000000 0f1185c0feffff } // n = 6, score = 500 // e8???????? | // 8d8d60ffffff | lea ecx, [ebp - 0xa0] // e8???????? | // 0f108560ffffff | movups xmm0, xmmword ptr [ebp - 0xa0] // be18000000 | mov esi, 0x18 // 0f1185c0feffff | movups xmmword ptr [ebp - 0x140], xmm0 $sequence_1 = { 0f104590 0f118540ffffff 0f1045a0 0f118550ffffff e8???????? 83c404 8d8d60ffffff } // n = 7, score = 500 // 0f104590 | movups xmm0, xmmword ptr [ebp - 0x70] // 0f118540ffffff | movups xmmword ptr [ebp - 0xc0], xmm0 // 0f1045a0 | movups xmm0, xmmword ptr [ebp - 0x60] // 0f118550ffffff | movups xmmword ptr [ebp - 0xb0], xmm0 // e8???????? | // 83c404 | add esp, 4 // 8d8d60ffffff | lea ecx, [ebp - 0xa0] $sequence_2 = { 894d9c 8b4dbc 89458c 8b45c4 897d98 8b7dc0 } // n = 6, score = 500 // 894d9c | mov dword ptr [ebp - 0x64], ecx // 8b4dbc | mov ecx, dword ptr [ebp - 0x44] // 89458c | mov dword ptr [ebp - 0x74], eax // 8b45c4 | mov eax, dword ptr [ebp - 0x3c] // 897d98 | mov dword ptr [ebp - 0x68], edi // 8b7dc0 | mov edi, dword ptr [ebp - 0x40] $sequence_3 = { 7410 f745d800000002 7407 b801000000 eb02 33c0 } // n = 6, score = 500 // 7410 | je 0x12 // f745d800000002 | test dword ptr [ebp - 0x28], 0x2000000 // 7407 | je 9 // b801000000 | mov eax, 1 // eb02 | jmp 4 // 33c0 | xor eax, eax $sequence_4 = { 03c2 898534ffffff 33c7 c1c008 898520ffffff 03c1 8b4ddc } // n = 7, score = 500 // 03c2 | add eax, edx // 898534ffffff | mov dword ptr [ebp - 0xcc], eax // 33c7 | xor eax, edi // c1c008 | rol eax, 8 // 898520ffffff | mov dword ptr [ebp - 0xe0], eax // 03c1 | add eax, ecx // 8b4ddc | mov ecx, dword ptr [ebp - 0x24] $sequence_5 = { 0fb605???????? c1e108 0bc8 0fb605???????? c1e108 0bc8 } // n = 6, score = 500 // 0fb605???????? | // c1e108 | shl ecx, 8 // 0bc8 | or ecx, eax // 0fb605???????? | // c1e108 | shl ecx, 8 // 0bc8 | or ecx, eax $sequence_6 = { e8???????? 83c404 0f57c0 660f138424501a0000 6a02 } // n = 5, score = 500 // e8???????? | // 83c404 | add esp, 4 // 0f57c0 | xorps xmm0, xmm0 // 660f138424501a0000 | movlpd qword ptr [esp + 0x1a50], xmm0 // 6a02 | push 2 $sequence_7 = { 8d8d60ffffff e8???????? 8d8d60ffffff e8???????? 0f108560ffffff be04000000 0f118510ffffff } // n = 7, score = 500 // 8d8d60ffffff | lea ecx, [ebp - 0xa0] // e8???????? | // 8d8d60ffffff | lea ecx, [ebp - 0xa0] // e8???????? | // 0f108560ffffff | movups xmm0, xmmword ptr [ebp - 0xa0] // be04000000 | mov esi, 4 // 0f118510ffffff | movups xmmword ptr [ebp - 0xf0], xmm0 $sequence_8 = { 0f1f440000 8b5cbc48 53 ff15???????? 83f801 } // n = 5, score = 500 // 0f1f440000 | nop dword ptr [eax + eax] // 8b5cbc48 | mov ebx, dword ptr [esp + edi*4 + 0x48] // 53 | push ebx // ff15???????? | // 83f801 | cmp eax, 1 $sequence_9 = { ffb590fdffff ff15???????? 85c0 0f8481fdffff 56 e8???????? } // n = 6, score = 500 // ffb590fdffff | push dword ptr [ebp - 0x270] // ff15???????? | // 85c0 | test eax, eax // 0f8481fdffff | je 0xfffffd87 // 56 | push esi // e8???????? | condition: 7 of them and filesize < 253952 }
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