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rule win_krbanker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" version = "1" description = "Detects win.krbanker." 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.krbanker" malpedia_rule_date = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { 3bf2 7d02 33f6 8a4500 240c } // n = 5, score = 400 // 3bf2 | cmp esi, edx // 7d02 | jge 4 // 33f6 | xor esi, esi // 8a4500 | mov al, byte ptr [ebp] // 240c | and al, 0xc $sequence_1 = { e8???????? 83c404 d945d8 eb06 } // n = 4, score = 400 // e8???????? | // 83c404 | add esp, 4 // d945d8 | fld dword ptr [ebp - 0x28] // eb06 | jmp 8 $sequence_2 = { 895c2414 8b482c 85c9 740e 8b4824 } // n = 5, score = 400 // 895c2414 | mov dword ptr [esp + 0x14], ebx // 8b482c | mov ecx, dword ptr [eax + 0x2c] // 85c9 | test ecx, ecx // 740e | je 0x10 // 8b4824 | mov ecx, dword ptr [eax + 0x24] $sequence_3 = { 57 51 85c0 7415 50 8bd8 e8???????? } // n = 7, score = 400 // 57 | push edi // 51 | push ecx // 85c0 | test eax, eax // 7415 | je 0x17 // 50 | push eax // 8bd8 | mov ebx, eax // e8???????? | $sequence_4 = { 8b4824 33db 49 85c9 0f9cc3 } // n = 5, score = 400 // 8b4824 | mov ecx, dword ptr [eax + 0x24] // 33db | xor ebx, ebx // 49 | dec ecx // 85c9 | test ecx, ecx // 0f9cc3 | setl bl $sequence_5 = { 8bf0 83c40c 83feff 0f848f000000 56 57 } // n = 6, score = 400 // 8bf0 | mov esi, eax // 83c40c | add esp, 0xc // 83feff | cmp esi, -1 // 0f848f000000 | je 0x95 // 56 | push esi // 57 | push edi $sequence_6 = { 8b410c 3bc7 7e0a 5f 5e 5d 33c0 } // n = 7, score = 400 // 8b410c | mov eax, dword ptr [ecx + 0xc] // 3bc7 | cmp eax, edi // 7e0a | jle 0xc // 5f | pop edi // 5e | pop esi // 5d | pop ebp // 33c0 | xor eax, eax $sequence_7 = { e8???????? 83c404 d945e4 eb06 8955e8 dd45e4 e8???????? } // n = 7, score = 400 // e8???????? | // 83c404 | add esp, 4 // d945e4 | fld dword ptr [ebp - 0x1c] // eb06 | jmp 8 // 8955e8 | mov dword ptr [ebp - 0x18], edx // dd45e4 | fld qword ptr [ebp - 0x1c] // e8???????? | $sequence_8 = { 684b000000 6801000000 bb40010000 e8???????? 83c410 } // n = 5, score = 400 // 684b000000 | push 0x4b // 6801000000 | push 1 // bb40010000 | mov ebx, 0x140 // e8???????? | // 83c410 | add esp, 0x10 $sequence_9 = { 33c0 5e 83c408 c3 8b4c2420 8b542404 8d442408 } // n = 7, score = 400 // 33c0 | xor eax, eax // 5e | pop esi // 83c408 | add esp, 8 // c3 | ret // 8b4c2420 | mov ecx, dword ptr [esp + 0x20] // 8b542404 | mov edx, dword ptr [esp + 4] // 8d442408 | lea eax, [esp + 8] condition: 7 of them and filesize < 1826816 }
rule win_krbanker_w0 { meta: author = "Proofpoint Staff" info = "krbanker / blackmoon update" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.krbanker" malpedia_version = "20170410" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s1 = "BlackMoon RunTime Error:" nocase wide ascii $s2 = "\\system32\\rundll32.exe" wide ascii $s3 = "cmd.exe /c ipconfig /flushdns" wide ascii $s4 = "\\system32\\drivers\\etc\\hosts.ics" wide ascii condition: all of them }
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