Actor(s): TA428
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rule win_albaniiutas_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.albaniiutas." 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.albaniiutas" 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 = { 8cd1 26037d3c de971c6b2958 51 03c7 a5 00d7 } // n = 7, score = 100 // 8cd1 | mov ecx, ss // 26037d3c | add edi, dword ptr es:[ebp + 0x3c] // de971c6b2958 | ficom word ptr [edi + 0x58296b1c] // 51 | push ecx // 03c7 | add eax, edi // a5 | movsd dword ptr es:[edi], dword ptr [esi] // 00d7 | add bh, dl $sequence_1 = { f7c200e00000 7416 8b4508 c74018201b0110 c74104513f0000 e9???????? } // n = 6, score = 100 // f7c200e00000 | test edx, 0xe000 // 7416 | je 0x18 // 8b4508 | mov eax, dword ptr [ebp + 8] // c74018201b0110 | mov dword ptr [eax + 0x18], 0x10011b20 // c74104513f0000 | mov dword ptr [ecx + 4], 0x3f51 // e9???????? | $sequence_2 = { 8d45e4 50 ff35???????? c745e410000000 c705????????02000000 c745e802000000 c745ec07000000 } // n = 7, score = 100 // 8d45e4 | lea eax, [ebp - 0x1c] // 50 | push eax // ff35???????? | // c745e410000000 | mov dword ptr [ebp - 0x1c], 0x10 // c705????????02000000 | // c745e802000000 | mov dword ptr [ebp - 0x18], 2 // c745ec07000000 | mov dword ptr [ebp - 0x14], 7 $sequence_3 = { 6bf630 8b04bd90df0210 f644302880 741f } // n = 4, score = 100 // 6bf630 | imul esi, esi, 0x30 // 8b04bd90df0210 | mov eax, dword ptr [edi*4 + 0x1002df90] // f644302880 | test byte ptr [eax + esi + 0x28], 0x80 // 741f | je 0x21 $sequence_4 = { c745e0f07c0110 ebbb d9e8 8b4510 dd18 } // n = 5, score = 100 // c745e0f07c0110 | mov dword ptr [ebp - 0x20], 0x10017cf0 // ebbb | jmp 0xffffffbd // d9e8 | fld1 // 8b4510 | mov eax, dword ptr [ebp + 0x10] // dd18 | fstp qword ptr [eax] $sequence_5 = { 7446 8b4508 c74018a81b0110 c74104513f0000 8b55fc 8b4104 } // n = 6, score = 100 // 7446 | je 0x48 // 8b4508 | mov eax, dword ptr [ebp + 8] // c74018a81b0110 | mov dword ptr [eax + 0x18], 0x10011ba8 // c74104513f0000 | mov dword ptr [ecx + 4], 0x3f51 // 8b55fc | mov edx, dword ptr [ebp - 4] // 8b4104 | mov eax, dword ptr [ecx + 4] $sequence_6 = { 34a3 92 8cca 716b } // n = 4, score = 100 // 34a3 | xor al, 0xa3 // 92 | xchg eax, edx // 8cca | mov edx, cs // 716b | jno 0x6d $sequence_7 = { 77d7 ac 79ac dd7d83 56 1d044c7f68 } // n = 6, score = 100 // 77d7 | ja 0xffffffd9 // ac | lodsb al, byte ptr [esi] // 79ac | jns 0xffffffae // dd7d83 | fnstsw dword ptr [ebp - 0x7d] // 56 | push esi // 1d044c7f68 | sbb eax, 0x687f4c04 $sequence_8 = { 6a00 6a00 a3???????? ff15???????? b801000000 8be5 5d } // n = 7, score = 100 // 6a00 | push 0 // 6a00 | push 0 // a3???????? | // ff15???????? | // b801000000 | mov eax, 1 // 8be5 | mov esp, ebp // 5d | pop ebp $sequence_9 = { f30f7e0e 83e908 8d7608 660fd60f 8d7f08 8b048dd46a0010 } // n = 6, score = 100 // f30f7e0e | movq xmm1, qword ptr [esi] // 83e908 | sub ecx, 8 // 8d7608 | lea esi, [esi + 8] // 660fd60f | movq qword ptr [edi], xmm1 // 8d7f08 | lea edi, [edi + 8] // 8b048dd46a0010 | mov eax, dword ptr [ecx*4 + 0x10006ad4] condition: 7 of them and filesize < 566272 }
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