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 = "2023-12-06" version = "1" description = "Detects win.jripbot." 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.jripbot" 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 = { 48 3b442418 0f822bffffff 8b8c24fc010000 5f 5e 5b } // n = 7, score = 100 // 48 | dec eax // 3b442418 | cmp eax, dword ptr [esp + 0x18] // 0f822bffffff | jb 0xffffff31 // 8b8c24fc010000 | mov ecx, dword ptr [esp + 0x1fc] // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_1 = { c1e807 8807 02d2 885701 66c7060100 33c9 837b0401 } // n = 7, score = 100 // c1e807 | shr eax, 7 // 8807 | mov byte ptr [edi], al // 02d2 | add dl, dl // 885701 | mov byte ptr [edi + 1], dl // 66c7060100 | mov word ptr [esi], 1 // 33c9 | xor ecx, ecx // 837b0401 | cmp dword ptr [ebx + 4], 1 $sequence_2 = { 8b5d08 c1eb08 23d8 0fb69b38834200 c1e608 33f3 8b5d0c } // n = 7, score = 100 // 8b5d08 | mov ebx, dword ptr [ebp + 8] // c1eb08 | shr ebx, 8 // 23d8 | and ebx, eax // 0fb69b38834200 | movzx ebx, byte ptr [ebx + 0x428338] // c1e608 | shl esi, 8 // 33f3 | xor esi, ebx // 8b5d0c | mov ebx, dword ptr [ebp + 0xc] $sequence_3 = { 8d742414 e8???????? 59 59 eb06 895c240c 33c0 } // n = 7, score = 100 // 8d742414 | lea esi, [esp + 0x14] // e8???????? | // 59 | pop ecx // 59 | pop ecx // eb06 | jmp 8 // 895c240c | mov dword ptr [esp + 0xc], ebx // 33c0 | xor eax, eax $sequence_4 = { 33c0 8b8eb8000000 3bc7 0f95c0 6a02 884105 33db } // n = 7, score = 100 // 33c0 | xor eax, eax // 8b8eb8000000 | mov ecx, dword ptr [esi + 0xb8] // 3bc7 | cmp eax, edi // 0f95c0 | setne al // 6a02 | push 2 // 884105 | mov byte ptr [ecx + 5], al // 33db | xor ebx, ebx $sequence_5 = { 51 50 56 56 ff750c ff75fc ffd7 } // n = 7, score = 100 // 51 | push ecx // 50 | push eax // 56 | push esi // 56 | push esi // ff750c | push dword ptr [ebp + 0xc] // ff75fc | push dword ptr [ebp - 4] // ffd7 | call edi $sequence_6 = { 50 e8???????? 8b1d???????? 83c40c 8d442438 50 ff15???????? } // n = 7, score = 100 // 50 | push eax // e8???????? | // 8b1d???????? | // 83c40c | add esp, 0xc // 8d442438 | lea eax, [esp + 0x38] // 50 | push eax // ff15???????? | $sequence_7 = { 8b4004 894604 33c0 8b8c242c010000 5f 5e 5b } // n = 7, score = 100 // 8b4004 | mov eax, dword ptr [eax + 4] // 894604 | mov dword ptr [esi + 4], eax // 33c0 | xor eax, eax // 8b8c242c010000 | mov ecx, dword ptr [esp + 0x12c] // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_8 = { eb04 8b442430 8b4c241c 2b4c2418 ff742418 8b5c2438 } // n = 6, score = 100 // eb04 | jmp 6 // 8b442430 | mov eax, dword ptr [esp + 0x30] // 8b4c241c | mov ecx, dword ptr [esp + 0x1c] // 2b4c2418 | sub ecx, dword ptr [esp + 0x18] // ff742418 | push dword ptr [esp + 0x18] // 8b5c2438 | mov ebx, dword ptr [esp + 0x38] $sequence_9 = { 7443 3bf8 743f 8b4368 397008 7537 8b4df4 } // n = 7, score = 100 // 7443 | je 0x45 // 3bf8 | cmp edi, eax // 743f | je 0x41 // 8b4368 | mov eax, dword ptr [ebx + 0x68] // 397008 | cmp dword ptr [eax + 8], esi // 7537 | jne 0x39 // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] 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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