Actor(s): Cleaver
There is no description at this point.
rule win_jasus_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.jasus." 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.jasus" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 83f8ff 7516 8d85e0fdffff 6a00 50 e8???????? } // n = 6, score = 200 // 83f8ff | cmp eax, -1 // 7516 | jne 0x18 // 8d85e0fdffff | lea eax, [ebp - 0x220] // 6a00 | push 0 // 50 | push eax // e8???????? | $sequence_1 = { 894604 81e1ff000000 c1ef08 333c8da0ca4100 8b4c2418 } // n = 5, score = 200 // 894604 | mov dword ptr [esi + 4], eax // 81e1ff000000 | and ecx, 0xff // c1ef08 | shr edi, 8 // 333c8da0ca4100 | xor edi, dword ptr [ecx*4 + 0x41caa0] // 8b4c2418 | mov ecx, dword ptr [esp + 0x18] $sequence_2 = { 7d08 8b10 894dfc 8955f8 83c028 41 } // n = 6, score = 200 // 7d08 | jge 0xa // 8b10 | mov edx, dword ptr [eax] // 894dfc | mov dword ptr [ebp - 4], ecx // 8955f8 | mov dword ptr [ebp - 8], edx // 83c028 | add eax, 0x28 // 41 | inc ecx $sequence_3 = { ff06 8b4e20 8b4624 8b16 3bc8 7419 3bc2 } // n = 7, score = 200 // ff06 | inc dword ptr [esi] // 8b4e20 | mov ecx, dword ptr [esi + 0x20] // 8b4624 | mov eax, dword ptr [esi + 0x24] // 8b16 | mov edx, dword ptr [esi] // 3bc8 | cmp ecx, eax // 7419 | je 0x1b // 3bc2 | cmp eax, edx $sequence_4 = { 7c08 8d50f6 83fa06 7704 b101 eb02 32c9 } // n = 7, score = 200 // 7c08 | jl 0xa // 8d50f6 | lea edx, [eax - 0xa] // 83fa06 | cmp edx, 6 // 7704 | ja 6 // b101 | mov cl, 1 // eb02 | jmp 4 // 32c9 | xor cl, cl $sequence_5 = { 81e7ff000000 c1e808 3304bda0ca4100 0fb67902 33f8 81e7ff000000 c1e808 } // n = 7, score = 200 // 81e7ff000000 | and edi, 0xff // c1e808 | shr eax, 8 // 3304bda0ca4100 | xor eax, dword ptr [edi*4 + 0x41caa0] // 0fb67902 | movzx edi, byte ptr [ecx + 2] // 33f8 | xor edi, eax // 81e7ff000000 | and edi, 0xff // c1e808 | shr eax, 8 $sequence_6 = { 750a 80fb2b 7405 80fb2f 757d } // n = 5, score = 200 // 750a | jne 0xc // 80fb2b | cmp bl, 0x2b // 7405 | je 7 // 80fb2f | cmp bl, 0x2f // 757d | jne 0x7f $sequence_7 = { 8b02 57 50 68???????? e8???????? 83c040 } // n = 6, score = 200 // 8b02 | mov eax, dword ptr [edx] // 57 | push edi // 50 | push eax // 68???????? | // e8???????? | // 83c040 | add eax, 0x40 $sequence_8 = { e8???????? 8be5 5d c3 8b5016 8b4dac 8911 } // n = 7, score = 200 // e8???????? | // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret // 8b5016 | mov edx, dword ptr [eax + 0x16] // 8b4dac | mov ecx, dword ptr [ebp - 0x54] // 8911 | mov dword ptr [ecx], edx $sequence_9 = { 894ddc 895dd6 668945da ff15???????? 8b0d???????? 8b55b0 668945d4 } // n = 7, score = 200 // 894ddc | mov dword ptr [ebp - 0x24], ecx // 895dd6 | mov dword ptr [ebp - 0x2a], ebx // 668945da | mov word ptr [ebp - 0x26], ax // ff15???????? | // 8b0d???????? | // 8b55b0 | mov edx, dword ptr [ebp - 0x50] // 668945d4 | mov word ptr [ebp - 0x2c], ax condition: 7 of them and filesize < 507904 }
rule win_jasus_w0 { meta: description = "ARP cache poisoner 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.jasus" malpedia_version = "20170521" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s1 = "pcap_dump_open" $s2 = "Resolving IPs to poison..." $s3 = "WARNNING: Gateway IP can not be found" condition: all of them }
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