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rule win_infy_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.infy." 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.infy" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 5d c20800 55 8bec 8b4508 8b4008 5d } // n = 7, score = 200 // 5d | pop ebp // c20800 | ret 8 // 55 | push ebp // 8bec | mov ebp, esp // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b4008 | mov eax, dword ptr [eax + 8] // 5d | pop ebp $sequence_1 = { 8bd0 83ea0a 66833a02 740b 8d45fc } // n = 5, score = 200 // 8bd0 | mov edx, eax // 83ea0a | sub edx, 0xa // 66833a02 | cmp word ptr [edx], 2 // 740b | je 0xd // 8d45fc | lea eax, [ebp - 4] $sequence_2 = { e8???????? 84c0 7455 6a05 8d55cc 33c0 } // n = 6, score = 200 // e8???????? | // 84c0 | test al, al // 7455 | je 0x57 // 6a05 | push 5 // 8d55cc | lea edx, [ebp - 0x34] // 33c0 | xor eax, eax $sequence_3 = { 59 833b00 75f3 bb01000000 68???????? } // n = 5, score = 200 // 59 | pop ecx // 833b00 | cmp dword ptr [ebx], 0 // 75f3 | jne 0xfffffff5 // bb01000000 | mov ebx, 1 // 68???????? | $sequence_4 = { 837dec00 740b 8b45f0 8b55f8 } // n = 4, score = 200 // 837dec00 | cmp dword ptr [ebp - 0x14], 0 // 740b | je 0xd // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 8b55f8 | mov edx, dword ptr [ebp - 8] $sequence_5 = { 7202 89cf 29fe 293d???????? 8935???????? eb21 0fb7431a } // n = 7, score = 200 // 7202 | jb 4 // 89cf | mov edi, ecx // 29fe | sub esi, edi // 293d???????? | // 8935???????? | // eb21 | jmp 0x23 // 0fb7431a | movzx eax, word ptr [ebx + 0x1a] $sequence_6 = { 7226 8b35???????? 0fb74b1a 8d91300b0000 39d7 } // n = 5, score = 200 // 7226 | jb 0x28 // 8b35???????? | // 0fb74b1a | movzx ecx, word ptr [ebx + 0x1a] // 8d91300b0000 | lea edx, [ecx + 0xb30] // 39d7 | cmp edi, edx $sequence_7 = { 85f6 7d04 33ff eb0a 8bf8 2bfb } // n = 6, score = 200 // 85f6 | test esi, esi // 7d04 | jge 6 // 33ff | xor edi, edi // eb0a | jmp 0xc // 8bf8 | mov edi, eax // 2bfb | sub edi, ebx $sequence_8 = { 7409 8b13 8bc3 e8???????? 85c0 7405 } // n = 6, score = 200 // 7409 | je 0xb // 8b13 | mov edx, dword ptr [ebx] // 8bc3 | mov eax, ebx // e8???????? | // 85c0 | test eax, eax // 7405 | je 7 $sequence_9 = { 01c2 89c8 83c830 8807 89d0 83f901 } // n = 6, score = 200 // 01c2 | add edx, eax // 89c8 | mov eax, ecx // 83c830 | or eax, 0x30 // 8807 | mov byte ptr [edi], al // 89d0 | mov eax, edx // 83f901 | cmp ecx, 1 condition: 7 of them and filesize < 147456 }
rule win_infy_w0 { meta: author = "Florian Roth" description = "Detects Foudre Backdoor" info = "foudre dropper" reference = "https://goo.gl/Nbqbt6" date = "2017-08-01" hash = "7e73a727dc8f3c48e58468c3fd0a193a027d085f25fa274a6e187cf503f01f74" hash = "7ce2c5111e3560aa6036f98b48ceafe83aa1ac3d3b33392835316c859970f8bc" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.infy" malpedia_version = "20170803" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s1 = "initialization failed: Reinstall the program" fullword wide $s2 = "SnailDriver V1" fullword wide $s3 = "lp.ini" fullword wide condition: filesize < 100KB and 2 of them }
rule win_infy_w1 { meta: author = "Florian Roth" description = "Detects Foudre Backdoor" info = "foudre dropper 2" reference = "https://goo.gl/Nbqbt6" date = "2017-08-01" hash = "6bc9f6ac2f6688ed63baa29913eaf8c64738cf19933d974d25a0c26b7d01b9ac" hash = "da228831089c56743d1fbc8ef156c672017cdf46a322d847a270b9907def53a5" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.infy" malpedia_version = "20170803" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $x1 = "536F594A96C5496CB3949A4DA4775B576E049C57696E646F77735C43757272656E7456657273696F6E5C5C52756E" fullword wide $x2 = "2220263024C380B3278695851482EC32" fullword wide $s1 = "C:\\Documents and Settings\\All Users\\Start Menu\\Programs\\\\Startup\\" fullword wide $s2 = "C:\\Documents and Settings\\All Users\\" fullword wide $s3 = "Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\\\Shell Folders" fullword wide $s4 = "ShellExecuteW" fullword wide condition: filesize < 100KB and ( 1 of ($x*) or 4 of them ) }
import "pe" rule win_infy_w2 { meta: description = "Detects Foudre Backdoor" author = "Florian Roth" info = "foudre backdoor" reference = "https://goo.gl/Nbqbt6" date = "2017-08-01" hash = "7c6206eaf0c5c9c6c8d8586a626b49575942572c51458575e51cba72ba2096a4" hash = "db605d501d3a5ca2b0e3d8296d552fbbf048ee831be21efca407c45bf794b109" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.infy" malpedia_version = "20170803" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: /* $s1 = "Project1.dll" fullword ascii */ /* Better: Project1.dll\x00D1 */ $s1 = { 50 72 6F 6A 65 63 74 31 2E 64 6C 6C 00 44 31 } $s2 = "winmgmts:\\\\localhost\\root\\SecurityCenter2" fullword wide $s3 = "C:\\Documents and Settings\\All Users\\" fullword wide condition: filesize < 2000KB and 3 of them or (2 of them and pe.exports("D1")) }
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