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rule win_kdcsponge_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.kdcsponge." 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.kdcsponge" 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 = { 0f8580010000 0fb681b0040000 3c01 0f85af000000 488b896c040000 4885c9 7429 } // n = 7, score = 100 // 0f8580010000 | dec eax // 0fb681b0040000 | lea ecx, [esp + 0x60] // 3c01 | jne 0x18f // 0f85af000000 | mov ecx, dword ptr [ecx] // 488b896c040000 | mov dword ptr [eax], ecx // 4885c9 | dec eax // 7429 | mov edx, dword ptr [esp + 0x60] $sequence_1 = { 57 4883ec20 488bd9 488d3d2c1afcff 488bcf e8???????? 85c0 } // n = 7, score = 100 // 57 | jne 0x79f // 4883ec20 | cmp byte ptr [ecx + 0x4b0], 1 // 488bd9 | jne 0x775 // 488d3d2c1afcff | movzx eax, byte ptr [ecx + 0x4c3] // 488bcf | cmp al, 1 // e8???????? | // 85c0 | jne 0x720 $sequence_2 = { e9???????? 80b90904000001 0f85c1000000 8b8138040000 488bd3 89813c040000 c6810904000008 } // n = 7, score = 100 // e9???????? | // 80b90904000001 | mov dword ptr [edx + 0x4a9], 1 // 0f85c1000000 | xor eax, eax // 8b8138040000 | je 0xf3c // 488bd3 | dec eax // 89813c040000 | mov eax, dword ptr [edx + 0x420] // c6810904000008 | dec eax $sequence_3 = { c3 f20f1005???????? 8b05???????? 4883a1a000000020 4883a1d000000001 48ff8120040000 } // n = 6, score = 100 // c3 | add eax, ecx // f20f1005???????? | // 8b05???????? | // 4883a1a000000020 | add ecx, dword ptr [edx + 0xc] // 4883a1d000000001 | dec eax // 48ff8120040000 | lea edx, [0x43a04] $sequence_4 = { 488d8bcc010000 c7834004000069000000 488bd3 e8???????? c7436000001d00 c783ec01000000100000 48c7832801000000000200 } // n = 7, score = 100 // 488d8bcc010000 | dec eax // c7834004000069000000 | mov dword ptr [ebx], eax // 488bd3 | dec eax // e8???????? | // c7436000001d00 | test eax, eax // c783ec01000000100000 | jle 0x7f7 // 48c7832801000000000200 | dec eax $sequence_5 = { 3c02 0f85f3000000 80b9c304000001 0f85e6000000 80b9bc0400000f 740a } // n = 6, score = 100 // 3c02 | mov dword ptr [ebx + 0x4ca], 4 // 0f85f3000000 | dec eax // 80b9c304000001 | lea ecx, [ebx + 0x1cc] // 0f85e6000000 | mov dword ptr [ebx + 0x440], eax // 80b9bc0400000f | dec eax // 740a | lea ecx, [ebx + 0x110] $sequence_6 = { 8b84cd18010000 8b94cd10010000 3bc2 7207 2bc2 83f849 7356 } // n = 7, score = 100 // 8b84cd18010000 | inc dword ptr [ebx + 0x420] // 8b94cd10010000 | dec eax // 3bc2 | mov ecx, dword ptr [ebx + 0x46c] // 7207 | dec eax // 2bc2 | mov ebx, ecx // 83f849 | jne 0xc26 // 7356 | movzx eax, byte ptr [ecx + 0x4b0] $sequence_7 = { 4883ec38 4c63e9 4c8d1581490100 498bfd 4d8bfd 49c1ff06 83e73f } // n = 7, score = 100 // 4883ec38 | mov eax, dword ptr [ecx + 0x43c] // 4c63e9 | dec eax // 4c8d1581490100 | mov ebx, ecx // 498bfd | mov dword ptr [ecx + 0x438], eax // 4d8bfd | ret // 49c1ff06 | inc eax // 83e73f | push edi $sequence_8 = { 488d0c80 8b44cd14 2b44cd0c 488b6c2470 03c3 4103c1 8b08 } // n = 7, score = 100 // 488d0c80 | mov dword ptr [ebx + 0x214], 1 // 8b44cd14 | dec eax // 2b44cd0c | mov dword ptr [ebx + 0x21c], 2 // 488b6c2470 | mov dword ptr [ebx + 0x1ec], 8 // 03c3 | test eax, eax // 4103c1 | mov dword ptr [ebx + 0x43c], 0x20 // 8b08 | dec eax $sequence_9 = { 74eb 83f802 7510 f20f1005???????? 8b05???????? eb27 } // n = 6, score = 100 // 74eb | movzx edx, byte ptr [ecx + 0x4ad] // 83f802 | mov byte ptr [ecx + 0x4c4], 1 // 7510 | inc ecx // f20f1005???????? | // 8b05???????? | // eb27 | mov eax, 0x120000 condition: 7 of them and filesize < 720896 }
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