Actor(s): APT37
There is no description at this point.
rule win_freenki_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.freenki." 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.freenki" 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 = { 0f84d3000000 8b048de4db4100 89859cf8ffff 85c0 0f8498000000 } // n = 5, score = 200 // 0f84d3000000 | je 0xd9 // 8b048de4db4100 | mov eax, dword ptr [ecx*4 + 0x41dbe4] // 89859cf8ffff | mov dword ptr [ebp - 0x764], eax // 85c0 | test eax, eax // 0f8498000000 | je 0x9e $sequence_1 = { ff15???????? 898554ffffff 57 85c0 753b } // n = 5, score = 200 // ff15???????? | // 898554ffffff | mov dword ptr [ebp - 0xac], eax // 57 | push edi // 85c0 | test eax, eax // 753b | jne 0x3d $sequence_2 = { 8b951cafffff 83c40c 8bce e8???????? } // n = 4, score = 200 // 8b951cafffff | mov edx, dword ptr [ebp - 0x50e4] // 83c40c | add esp, 0xc // 8bce | mov ecx, esi // e8???????? | $sequence_3 = { 0f1f4000 0fb701 8d4902 6689440afe 6685c0 75f0 8d45c4 } // n = 7, score = 200 // 0f1f4000 | nop dword ptr [eax] // 0fb701 | movzx eax, word ptr [ecx] // 8d4902 | lea ecx, [ecx + 2] // 6689440afe | mov word ptr [edx + ecx - 2], ax // 6685c0 | test ax, ax // 75f0 | jne 0xfffffff2 // 8d45c4 | lea eax, [ebp - 0x3c] $sequence_4 = { 50 e8???????? 6800100000 8d85f8ceffff 6a00 50 e8???????? } // n = 7, score = 200 // 50 | push eax // e8???????? | // 6800100000 | push 0x1000 // 8d85f8ceffff | lea eax, [ebp - 0x3108] // 6a00 | push 0 // 50 | push eax // e8???????? | $sequence_5 = { e8???????? 8bf8 85ff 0f840c010000 8bb5f4fbffff } // n = 5, score = 200 // e8???????? | // 8bf8 | mov edi, eax // 85ff | test edi, edi // 0f840c010000 | je 0x112 // 8bb5f4fbffff | mov esi, dword ptr [ebp - 0x40c] $sequence_6 = { 85db 747c 53 56 } // n = 4, score = 200 // 85db | test ebx, ebx // 747c | je 0x7e // 53 | push ebx // 56 | push esi $sequence_7 = { 83c020 3bc7 7cd4 5f 3bc2 7d11 8a0c30 } // n = 7, score = 200 // 83c020 | add eax, 0x20 // 3bc7 | cmp eax, edi // 7cd4 | jl 0xffffffd6 // 5f | pop edi // 3bc2 | cmp eax, edx // 7d11 | jge 0x13 // 8a0c30 | mov cl, byte ptr [eax + esi] $sequence_8 = { 8d5594 52 0f57c0 6a02 8b08 660f13854cffffff } // n = 6, score = 200 // 8d5594 | lea edx, [ebp - 0x6c] // 52 | push edx // 0f57c0 | xorps xmm0, xmm0 // 6a02 | push 2 // 8b08 | mov ecx, dword ptr [eax] // 660f13854cffffff | movlpd qword ptr [ebp - 0xb4], xmm0 $sequence_9 = { 8d4dc0 c745fc01000000 e8???????? c645fc02 8b0e 85c9 7404 } // n = 7, score = 200 // 8d4dc0 | lea ecx, [ebp - 0x40] // c745fc01000000 | mov dword ptr [ebp - 4], 1 // e8???????? | // c645fc02 | mov byte ptr [ebp - 4], 2 // 8b0e | mov ecx, dword ptr [esi] // 85c9 | test ecx, ecx // 7404 | je 6 condition: 7 of them and filesize < 327680 }
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