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rule win_kdcsponge_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 80b9b104000001 c6810904000008 0f85bf000000 80b9ad04000000 c781a004000002000000 c7416002001100 7552 } // n = 7, score = 100 // 80b9b104000001 | dec eax // c6810904000008 | mov ebx, ecx // 0f85bf000000 | jne 0x1acb // 80b9ad04000000 | dec eax // c781a004000002000000 | mov ecx, dword ptr [ecx + 0x46c] // c7416002001100 | dec eax // 7552 | test ecx, ecx $sequence_1 = { 488b8228040000 4885c0 7507 488b8230040000 4883c002 4803c1 } // n = 6, score = 100 // 488b8228040000 | movsd qword ptr [ecx], xmm0 // 4885c0 | mov byte ptr [ecx + 8], al // 7507 | dec eax // 488b8230040000 | mov ecx, ebx // 4883c002 | dec eax // 4803c1 | lea eax, [ebx - 1] $sequence_2 = { 7507 c681c504000006 c7814004000003000000 c781ca04000004000000 e9???????? e9???????? 3c01 } // n = 7, score = 100 // 7507 | add ecx, eax // c681c504000006 | inc esp // c7814004000003000000 | add eax, esi // c781ca04000004000000 | inc ebp // e9???????? | // e9???????? | // 3c01 | add eax, ecx $sequence_3 = { 0f85d5000000 80b9ad04000001 0f85bf000000 f681ae04000008 0f84b2000000 488b896c040000 } // n = 6, score = 100 // 0f85d5000000 | mov byte ptr [ebx + 0x4bf], dh // 80b9ad04000001 | shr dl, 7 // 0f85bf000000 | mov byte ptr [ebx + 0x4a4], dl // f681ae04000008 | movzx ecx, byte ptr [eax + 2] // 0f84b2000000 | shr cl, 3 // 488b896c040000 | and cl, 0xf $sequence_4 = { 898520030000 e8???????? 488d0db15ffcff 48c1e602 0fb784b9c0550400 488d91b04c0400 488d8d24030000 } // n = 7, score = 100 // 898520030000 | mov dword ptr [ebp - 0x30], 0x245c8948 // e8???????? | // 488d0db15ffcff | dec eax // 48c1e602 | lea edx, [ebp - 0x30] // 0fb784b9c0550400 | dec eax // 488d91b04c0400 | lea ecx, [0x2675d] // 488d8d24030000 | dec eax $sequence_5 = { 488b542450 488b4e08 e8???????? 488d4c2440 ff15???????? 0fb74504 ffc7 } // n = 7, score = 100 // 488b542450 | dec eax // 488b4e08 | test ecx, ecx // e8???????? | // 488d4c2440 | je 0x1d3e // ff15???????? | // 0fb74504 | dec eax // ffc7 | mov eax, dword ptr [ebx + 0x420] $sequence_6 = { 448d4020 c745c048895c24 488d55c0 c745c420555657 488d0df1480200 c745c841544155 c745cc41564157 } // n = 7, score = 100 // 448d4020 | je 0x17d2 // c745c048895c24 | shr ecx, 3 // 488d55c0 | and ecx, 7 // c745c420555657 | mov dword ptr [ebx + 0x45c], ecx // 488d0df1480200 | jne 0x1779 // c745c841544155 | mov dword ptr [ebx + 0x440], 0x67 // c745cc41564157 | jmp 0x17e7 $sequence_7 = { c6830804000001 f20f1005???????? 8b05???????? c7436003000100 eb24 83f807 753d } // n = 7, score = 100 // c6830804000001 | ret // f20f1005???????? | // 8b05???????? | // c7436003000100 | dec eax // eb24 | inc dword ptr [edx + 0x420] // 83f807 | dec eax // 753d | inc eax $sequence_8 = { 7507 c681c504000006 ba65000000 c744243004000000 448bca c744242804000000 448bc2 } // n = 7, score = 100 // 7507 | dec ecx // c681c504000006 | mov ebx, ebx // ba65000000 | dec esp // c744243004000000 | lea ecx, [0x2cd24] // 448bca | nop dword ptr [eax] // c744242804000000 | inc esp // 448bc2 | add eax, ecx $sequence_9 = { c6470801 e9???????? 41b803000000 488d1578f90000 488bcb e8???????? 85c0 } // n = 7, score = 100 // c6470801 | jne 0x652 // e9???????? | // 41b803000000 | dec eax // 488d1578f90000 | lea ecx, [ebx + 0x110] // 488bcb | mov dword ptr [ebx + 0x440], 6 // e8???????? | // 85c0 | dec eax condition: 7 of them and filesize < 720896 }
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