Actor(s): Cleaver
There is no description at this point.
rule win_wndtest_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.wndtest." 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.wndtest" 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 = { 8d1439 8a0410 320419 41 } // n = 4, score = 400 // 8d1439 | lea edx, [ecx + edi] // 8a0410 | mov al, byte ptr [eax + edx] // 320419 | xor al, byte ptr [ecx + ebx] // 41 | inc ecx $sequence_1 = { 56 ffd7 8b0d???????? a3???????? a1???????? } // n = 5, score = 400 // 56 | push esi // ffd7 | call edi // 8b0d???????? | // a3???????? | // a1???????? | $sequence_2 = { 56 0fbe7001 83f60d 57 } // n = 4, score = 400 // 56 | push esi // 0fbe7001 | movsx esi, byte ptr [eax + 1] // 83f60d | xor esi, 0xd // 57 | push edi $sequence_3 = { 880c3e 5f 5e 8be5 } // n = 4, score = 400 // 880c3e | mov byte ptr [esi + edi], cl // 5f | pop edi // 5e | pop esi // 8be5 | mov esp, ebp $sequence_4 = { 75ea 8bcb 0fb6d2 c1e918 33ca c1e308 } // n = 6, score = 400 // 75ea | jne 0xffffffec // 8bcb | mov ecx, ebx // 0fb6d2 | movzx edx, dl // c1e918 | shr ecx, 0x18 // 33ca | xor ecx, edx // c1e308 | shl ebx, 8 $sequence_5 = { a3???????? a1???????? 50 51 e8???????? 83c408 50 } // n = 7, score = 400 // a3???????? | // a1???????? | // 50 | push eax // 51 | push ecx // e8???????? | // 83c408 | add esp, 8 // 50 | push eax $sequence_6 = { 2bc2 40 50 e8???????? 8bd0 } // n = 5, score = 400 // 2bc2 | sub eax, edx // 40 | inc eax // 50 | push eax // e8???????? | // 8bd0 | mov edx, eax $sequence_7 = { ffd7 8b15???????? a3???????? a1???????? 52 50 e8???????? } // n = 7, score = 400 // ffd7 | call edi // 8b15???????? | // a3???????? | // a1???????? | // 52 | push edx // 50 | push eax // e8???????? | $sequence_8 = { 83c404 33c9 8d460a ba02000000 f7e2 } // n = 5, score = 400 // 83c404 | add esp, 4 // 33c9 | xor ecx, ecx // 8d460a | lea eax, [esi + 0xa] // ba02000000 | mov edx, 2 // f7e2 | mul edx $sequence_9 = { 8b0d???????? 894808 e9???????? 8d46fe 8bff 668b4802 } // n = 6, score = 400 // 8b0d???????? | // 894808 | mov dword ptr [eax + 8], ecx // e9???????? | // 8d46fe | lea eax, [esi - 2] // 8bff | mov edi, edi // 668b4802 | mov cx, word ptr [eax + 2] condition: 7 of them and filesize < 901120 }
rule win_wndtest_w0 { meta: description = "Backdoor used by attackers in Operation Cleaver" reference = "http://cylance.com/assets/Cleaver/Cylance_Operation_Cleaver_Report.pdf" date = "2014/12/02" author = "Cylance Inc." malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.wndtest" malpedia_version = "20170521" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s1 = "[Alt]" wide $s2 = "<< %s >>:" wide $s3 = "Content-Disposition: inline; comp=%s; account=%s; product=%d;" condition: all of them }
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