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rule win_carberp_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.carberp." 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.carberp" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { ffd0 c3 68d570346b 6a0f 6a00 e8???????? 83c40c } // n = 7, score = 200 // ffd0 | call eax // c3 | ret // 68d570346b | push 0x6b3470d5 // 6a0f | push 0xf // 6a00 | push 0 // e8???????? | // 83c40c | add esp, 0xc $sequence_1 = { ff742408 ff742408 ffd0 c3 68192b9095 6a01 6a00 } // n = 7, score = 200 // ff742408 | push dword ptr [esp + 8] // ff742408 | push dword ptr [esp + 8] // ffd0 | call eax // c3 | ret // 68192b9095 | push 0x95902b19 // 6a01 | push 1 // 6a00 | push 0 $sequence_2 = { e8???????? e8???????? b001 c3 68836927f2 6a07 } // n = 6, score = 200 // e8???????? | // e8???????? | // b001 | mov al, 1 // c3 | ret // 68836927f2 | push 0xf2276983 // 6a07 | push 7 $sequence_3 = { c9 c3 ff7508 e8???????? 59 59 8945fc } // n = 7, score = 200 // c9 | leave // c3 | ret // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 59 | pop ecx // 59 | pop ecx // 8945fc | mov dword ptr [ebp - 4], eax $sequence_4 = { 53 6a44 33db 8d45ac 53 50 e8???????? } // n = 7, score = 200 // 53 | push ebx // 6a44 | push 0x44 // 33db | xor ebx, ebx // 8d45ac | lea eax, [ebp - 0x54] // 53 | push ebx // 50 | push eax // e8???????? | $sequence_5 = { ff74240c ffd0 c3 681d5b931f 6a04 6a00 e8???????? } // n = 7, score = 200 // ff74240c | push dword ptr [esp + 0xc] // ffd0 | call eax // c3 | ret // 681d5b931f | push 0x1f935b1d // 6a04 | push 4 // 6a00 | push 0 // e8???????? | $sequence_6 = { ff7508 e8???????? 59 8945ec 3bc3 0f84f5000000 395d14 } // n = 7, score = 200 // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 59 | pop ecx // 8945ec | mov dword ptr [ebp - 0x14], eax // 3bc3 | cmp eax, ebx // 0f84f5000000 | je 0xfb // 395d14 | cmp dword ptr [ebp + 0x14], ebx $sequence_7 = { c645486e 885d49 c6450057 c6450169 c645026e c6450364 c645046f } // n = 7, score = 200 // c645486e | mov byte ptr [ebp + 0x48], 0x6e // 885d49 | mov byte ptr [ebp + 0x49], bl // c6450057 | mov byte ptr [ebp], 0x57 // c6450169 | mov byte ptr [ebp + 1], 0x69 // c645026e | mov byte ptr [ebp + 2], 0x6e // c6450364 | mov byte ptr [ebp + 3], 0x64 // c645046f | mov byte ptr [ebp + 4], 0x6f $sequence_8 = { 81ec30020000 56 6a00 6a02 e8???????? 8d8dd0fdffff 51 } // n = 7, score = 200 // 81ec30020000 | sub esp, 0x230 // 56 | push esi // 6a00 | push 0 // 6a02 | push 2 // e8???????? | // 8d8dd0fdffff | lea ecx, [ebp - 0x230] // 51 | push ecx $sequence_9 = { ff7508 50 56 e8???????? ff7658 e8???????? 83c418 } // n = 7, score = 200 // ff7508 | push dword ptr [ebp + 8] // 50 | push eax // 56 | push esi // e8???????? | // ff7658 | push dword ptr [esi + 0x58] // e8???????? | // 83c418 | add esp, 0x18 condition: 7 of them and filesize < 491520 }
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