Actor(s): APT32
There is no description at this point.
rule win_kerrdown_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.kerrdown." 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.kerrdown" 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 = { ff15???????? 6a01 68???????? 68???????? 53 68???????? 6a00 } // n = 7, score = 200 // ff15???????? | // 6a01 | push 1 // 68???????? | // 68???????? | // 53 | push ebx // 68???????? | // 6a00 | push 0 $sequence_1 = { 50 e8???????? 8b3d???????? 83c40c 8b0d???????? 83ff10 } // n = 6, score = 200 // 50 | push eax // e8???????? | // 8b3d???????? | // 83c40c | add esp, 0xc // 8b0d???????? | // 83ff10 | cmp edi, 0x10 $sequence_2 = { e8???????? 8b442430 83c418 83f810 722f } // n = 5, score = 200 // e8???????? | // 8b442430 | mov eax, dword ptr [esp + 0x30] // 83c418 | add esp, 0x18 // 83f810 | cmp eax, 0x10 // 722f | jb 0x31 $sequence_3 = { 8d44241c 8bcc 6aff 6a00 c741140f000000 c7411000000000 } // n = 6, score = 200 // 8d44241c | lea eax, dword ptr [esp + 0x1c] // 8bcc | mov ecx, esp // 6aff | push -1 // 6a00 | push 0 // c741140f000000 | mov dword ptr [ecx + 0x14], 0xf // c7411000000000 | mov dword ptr [ecx + 0x10], 0 $sequence_4 = { 64a300000000 8bf9 897ddc c745d800000000 33f6 c747140f000000 } // n = 6, score = 200 // 64a300000000 | mov dword ptr fs:[0], eax // 8bf9 | mov edi, ecx // 897ddc | mov dword ptr [ebp - 0x24], edi // c745d800000000 | mov dword ptr [ebp - 0x28], 0 // 33f6 | xor esi, esi // c747140f000000 | mov dword ptr [edi + 0x14], 0xf $sequence_5 = { 03c2 3d???????? 762a ff750c 83ff10 } // n = 5, score = 200 // 03c2 | add eax, edx // 3d???????? | // 762a | jbe 0x2c // ff750c | push dword ptr [ebp + 0xc] // 83ff10 | cmp edi, 0x10 $sequence_6 = { 8b45dc 85c0 0f8544ffffff 85f6 0f848f000000 33c0 } // n = 6, score = 200 // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 85c0 | test eax, eax // 0f8544ffffff | jne 0xffffff4a // 85f6 | test esi, esi // 0f848f000000 | je 0x95 // 33c0 | xor eax, eax $sequence_7 = { 8a01 41 884435e8 46 894de0 83fe04 7571 } // n = 7, score = 200 // 8a01 | mov al, byte ptr [ecx] // 41 | inc ecx // 884435e8 | mov byte ptr [ebp + esi - 0x18], al // 46 | inc esi // 894de0 | mov dword ptr [ebp - 0x20], ecx // 83fe04 | cmp esi, 4 // 7571 | jne 0x73 $sequence_8 = { 8a01 41 884435e8 46 } // n = 4, score = 200 // 8a01 | mov al, byte ptr [ecx] // 41 | inc ecx // 884435e8 | mov byte ptr [ebp + esi - 0x18], al // 46 | inc esi $sequence_9 = { ff750c 83ff10 ba???????? b8???????? 0f43d1 b9???????? 2bc2 } // n = 7, score = 200 // ff750c | push dword ptr [ebp + 0xc] // 83ff10 | cmp edi, 0x10 // ba???????? | // b8???????? | // 0f43d1 | cmovae edx, ecx // b9???????? | // 2bc2 | sub eax, edx condition: 7 of them and filesize < 278528 }
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