Actor(s): WildNeutron
There is no description at this point.
rule win_jripbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.jripbot" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 8bec 83ec0c ff7508 8365f400 8365fc00 } // n = 5, score = 100 // 8bec | mov ebp, esp // 83ec0c | sub esp, 0xc // ff7508 | push dword ptr [ebp + 8] // 8365f400 | and dword ptr [ebp - 0xc], 0 // 8365fc00 | and dword ptr [ebp - 4], 0 $sequence_1 = { 83c704 8b07 85c0 75de 6800040000 ff33 } // n = 6, score = 100 // 83c704 | add edi, 4 // 8b07 | mov eax, dword ptr [edi] // 85c0 | test eax, eax // 75de | jne 0xffffffe0 // 6800040000 | push 0x400 // ff33 | push dword ptr [ebx] $sequence_2 = { ff15???????? 59 33ff 59 391d???????? 7420 b8???????? } // n = 7, score = 100 // ff15???????? | // 59 | pop ecx // 33ff | xor edi, edi // 59 | pop ecx // 391d???????? | // 7420 | je 0x22 // b8???????? | $sequence_3 = { 83c178 e8???????? 8b4b74 83c414 83c178 e8???????? 8b4b74 } // n = 7, score = 100 // 83c178 | add ecx, 0x78 // e8???????? | // 8b4b74 | mov ecx, dword ptr [ebx + 0x74] // 83c414 | add esp, 0x14 // 83c178 | add ecx, 0x78 // e8???????? | // 8b4b74 | mov ecx, dword ptr [ebx + 0x74] $sequence_4 = { 8b44240c e9???????? 8bc3 8d4802 668b10 83c002 6685d2 } // n = 7, score = 100 // 8b44240c | mov eax, dword ptr [esp + 0xc] // e9???????? | // 8bc3 | mov eax, ebx // 8d4802 | lea ecx, [eax + 2] // 668b10 | mov dx, word ptr [eax] // 83c002 | add eax, 2 // 6685d2 | test dx, dx $sequence_5 = { 1bc0 83d8ff 3bc3 7511 ff7508 ff15???????? 89471c } // n = 7, score = 100 // 1bc0 | sbb eax, eax // 83d8ff | sbb eax, -1 // 3bc3 | cmp eax, ebx // 7511 | jne 0x13 // ff7508 | push dword ptr [ebp + 8] // ff15???????? | // 89471c | mov dword ptr [edi + 0x1c], eax $sequence_6 = { 741e 8bc3 8d5002 668b08 83c002 6685c9 } // n = 6, score = 100 // 741e | je 0x20 // 8bc3 | mov eax, ebx // 8d5002 | lea edx, [eax + 2] // 668b08 | mov cx, word ptr [eax] // 83c002 | add eax, 2 // 6685c9 | test cx, cx $sequence_7 = { 57 8945fc 53 83f8ff 7511 891e } // n = 6, score = 100 // 57 | push edi // 8945fc | mov dword ptr [ebp - 4], eax // 53 | push ebx // 83f8ff | cmp eax, -1 // 7511 | jne 0x13 // 891e | mov dword ptr [esi], ebx $sequence_8 = { 23d8 8bf8 f7d7 237dfc 8945ec 0bfb } // n = 6, score = 100 // 23d8 | and ebx, eax // 8bf8 | mov edi, eax // f7d7 | not edi // 237dfc | and edi, dword ptr [ebp - 4] // 8945ec | mov dword ptr [ebp - 0x14], eax // 0bfb | or edi, ebx $sequence_9 = { 49 743d 49 742a 49 7417 49 } // n = 7, score = 100 // 49 | dec ecx // 743d | je 0x3f // 49 | dec ecx // 742a | je 0x2c // 49 | dec ecx // 7417 | je 0x19 // 49 | dec ecx condition: 7 of them and filesize < 507904 }
rule win_jripbot_w0 { meta: author = "Florian Roth" reference = "https://securelist.com/blog/research/71275/wild-neutron-economic-espionage-threat-actor-returns-with-new-tricks/" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.jripbot" malpedia_version = "20180301" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s0 = "LiveUpdater.exe" fullword wide /* PEStudio Blacklist: strings */ /* score: '25.00' */ $s1 = "id-at-postalAddress" fullword ascii /* PEStudio Blacklist: strings */ /* score: '18.00' */ $s2 = "%d -> %d (default)" fullword wide /* PEStudio Blacklist: strings */ /* score: '17.00' */ $s3 = "%s%s%s=%d,%s=%d,%s=%d," fullword wide /* score: '15.00' */ $s8 = "id-ce-keyUsage" fullword ascii /* score: '12.00' */ $s9 = "Key Usage" fullword ascii /* score: '12.00' */ $s32 = "UPDATE_ID" fullword wide /* PEStudio Blacklist: strings */ /* score: '9.00' */ $s37 = "id-at-commonName" fullword ascii /* score: '8.00' */ $s38 = "2008R2" fullword wide /* PEStudio Blacklist: os */ /* score: '8.00' */ $s39 = "RSA-alt" fullword ascii /* PEStudio Blacklist: strings */ /* score: '8.00' */ $s40 = "%02d.%04d.%s" fullword wide /* score: '7.02' */ condition: all of them }
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