Ransomware family closely related to GlobeImposter, notable for its use of SHACAL-2 encryption algorithm.
rule win_maoloa_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.maoloa." 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.maoloa" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 83f802 7710 8bd6 8b85a0e3ffff 8b4820 e8???????? 8bce } // n = 7, score = 100 // 83f802 | cmp eax, 2 // 7710 | ja 0x12 // 8bd6 | mov edx, esi // 8b85a0e3ffff | mov eax, dword ptr [ebp - 0x1c60] // 8b4820 | mov ecx, dword ptr [eax + 0x20] // e8???????? | // 8bce | mov ecx, esi $sequence_1 = { 7707 8d45dc 3bd0 7351 8bc7 83e0c0 } // n = 6, score = 100 // 7707 | ja 9 // 8d45dc | lea eax, [ebp - 0x24] // 3bd0 | cmp edx, eax // 7351 | jae 0x53 // 8bc7 | mov eax, edi // 83e0c0 | and eax, 0xffffffc0 $sequence_2 = { 68000000c0 51 ff15???????? 8945d8 83f8ff 7445 57 } // n = 7, score = 100 // 68000000c0 | push 0xc0000000 // 51 | push ecx // ff15???????? | // 8945d8 | mov dword ptr [ebp - 0x28], eax // 83f8ff | cmp eax, -1 // 7445 | je 0x47 // 57 | push edi $sequence_3 = { 85f6 0f8543010000 8b55f4 8d45e8 50 8d4ddc e8???????? } // n = 7, score = 100 // 85f6 | test esi, esi // 0f8543010000 | jne 0x149 // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // 8d45e8 | lea eax, [ebp - 0x18] // 50 | push eax // 8d4ddc | lea ecx, [ebp - 0x24] // e8???????? | $sequence_4 = { 6a30 8d842464010000 6a00 50 a1???????? ffd0 6a20 } // n = 7, score = 100 // 6a30 | push 0x30 // 8d842464010000 | lea eax, [esp + 0x164] // 6a00 | push 0 // 50 | push eax // a1???????? | // ffd0 | call eax // 6a20 | push 0x20 $sequence_5 = { 83c40c c705????????d0704000 8d55dc c705????????80164300 b9???????? c705????????20000000 c705????????10270000 } // n = 7, score = 100 // 83c40c | add esp, 0xc // c705????????d0704000 | // 8d55dc | lea edx, [ebp - 0x24] // c705????????80164300 | // b9???????? | // c705????????20000000 | // c705????????10270000 | $sequence_6 = { 660fefc8 0f114c07f0 3b4dcc 72d7 8b7dbc 894dc8 8b45d8 } // n = 7, score = 100 // 660fefc8 | pxor xmm1, xmm0 // 0f114c07f0 | movups xmmword ptr [edi + eax - 0x10], xmm1 // 3b4dcc | cmp ecx, dword ptr [ebp - 0x34] // 72d7 | jb 0xffffffd9 // 8b7dbc | mov edi, dword ptr [ebp - 0x44] // 894dc8 | mov dword ptr [ebp - 0x38], ecx // 8b45d8 | mov eax, dword ptr [ebp - 0x28] $sequence_7 = { 46 83eb03 743b 660f1f440000 4b bf64000000 6a01 } // n = 7, score = 100 // 46 | inc esi // 83eb03 | sub ebx, 3 // 743b | je 0x3d // 660f1f440000 | nop word ptr [eax + eax] // 4b | dec ebx // bf64000000 | mov edi, 0x64 // 6a01 | push 1 $sequence_8 = { 03d7 0bc2 33c7 05c3595b65 0345c0 03f0 8bc7 } // n = 7, score = 100 // 03d7 | add edx, edi // 0bc2 | or eax, edx // 33c7 | xor eax, edi // 05c3595b65 | add eax, 0x655b59c3 // 0345c0 | add eax, dword ptr [ebp - 0x40] // 03f0 | add esi, eax // 8bc7 | mov eax, edi $sequence_9 = { e8???????? 894508 85c0 752e 33ff 85db } // n = 6, score = 100 // e8???????? | // 894508 | mov dword ptr [ebp + 8], eax // 85c0 | test eax, eax // 752e | jne 0x30 // 33ff | xor edi, edi // 85db | test ebx, ebx condition: 7 of them and filesize < 586752 }
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