Actor(s): Axiom
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rule win_winnti_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-10-14" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.5.0" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.winnti" malpedia_rule_date = "20201014" malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9" malpedia_version = "20201014" 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 = { 85c0 7540 8d442414 8bce } // n = 4, score = 100 // 85c0 | sub esp, 0x40 // 7540 | dec eax // 8d442414 | mov ebp, edx // 8bce | dec eax $sequence_1 = { 663918 75f7 488d1590110000 482bd0 } // n = 4, score = 100 // 663918 | add eax, edx // 75f7 | xor edx, edx // 488d1590110000 | mov eax, ecx // 482bd0 | inc ecx $sequence_2 = { 7537 8b442418 8b4804 8b10 51 52 8bce } // n = 7, score = 100 // 7537 | mov ecx, dword ptr [ebx + 0x44] // 8b442418 | mov edx, dword ptr [ebx + 0x48] // 8b4804 | mov ebp, dword ptr [ebx + 0x14] // 8b10 | test eax, eax // 51 | jg 0x48 // 52 | push esi // 8bce | push 0x3e8 $sequence_3 = { 4503c2 33d2 8bc1 41f7f2 85d2 7402 } // n = 6, score = 100 // 4503c2 | nop dword ptr [eax + eax] // 33d2 | inc ebx // 8bc1 | movzx ecx, byte ptr [ecx + eax] // 41f7f2 | lea eax, [ecx - 0x41] // 85d2 | cmp al, 0x19 // 7402 | inc ebp $sequence_4 = { 8b44241c 3d08020000 7387 3bc7 7483 } // n = 5, score = 100 // 8b44241c | jbe 0x94 // 3d08020000 | mov ecx, dword ptr [eax + ebx + 0xb0] // 7387 | test ecx, ecx // 3bc7 | je 0x94 // 7483 | test eax, eax $sequence_5 = { ffc2 0fb603 4238bc00207a0b00 74e4 0fb60b 420fbe8401207a0b00 } // n = 6, score = 100 // ffc2 | mov ecx, esi // 0fb603 | mov byte ptr [esi + edi], 0 // 4238bc00207a0b00 | mov ecx, dword ptr [ebx + 8] // 74e4 | test ecx, ecx // 0fb60b | je 0xb // 420fbe8401207a0b00 | push edi $sequence_6 = { e9???????? 8bdf 895db7 41ffc0 4489459b } // n = 5, score = 100 // e9???????? | // 8bdf | inc edx // 895db7 | cmp byte ptr [eax + eax + 0xb7a20], bh // 41ffc0 | je 0xffffffee // 4489459b | movzx ecx, byte ptr [ebx] $sequence_7 = { 85c0 7f44 56 ff15???????? 68e8030000 33f6 ff15???????? } // n = 7, score = 100 // 85c0 | xor ecx, ecx // 7f44 | jb 0xffffffa8 // 56 | dec eax // ff15???????? | // 68e8030000 | arpl word ptr [ebx + 0x3c], ax // 33f6 | cmp dword ptr [eax + ebx + 0x84], 5 // ff15???????? | $sequence_8 = { 488d442440 4889442428 488d050cbb0a00 4889442420 } // n = 4, score = 100 // 488d442440 | mov ecx, dword ptr [eax + 4] // 4889442428 | mov edx, dword ptr [eax] // 488d050cbb0a00 | push ecx // 4889442420 | push edx $sequence_9 = { 488d5128 488d4de7 e8???????? 90 } // n = 4, score = 100 // 488d5128 | push 2 // 488d4de7 | mov ecx, dword ptr [esp + 0x190] // e8???????? | // 90 | mov esi, dword ptr [esp + 0x24] $sequence_10 = { 413bec 7532 4585ed 742d 488b9680000000 4963dc } // n = 6, score = 100 // 413bec | dec eax // 7532 | lea eax, [0xabb0c] // 4585ed | dec eax // 742d | mov dword ptr [esp + 0x20], eax // 488b9680000000 | inc edx // 4963dc | movzx eax, byte ptr [ebx] $sequence_11 = { 8bd9 55 56 57 8b4b44 8b5348 8b6b14 } // n = 7, score = 100 // 8bd9 | mov ecx, dword ptr [ebp + 0xb0] // 55 | dec eax // 56 | test ecx, ecx // 57 | cmp eax, 1 // 8b4b44 | jle 0x22 // 8b5348 | dec eax // 8b6b14 | lea ecx, [0x120a] $sequence_12 = { 33c9 85c0 0f8514010000 4c8d2d32560a00 41b804010000 668935???????? } // n = 6, score = 100 // 33c9 | mov ecx, edx // 85c0 | sub ecx, esi // 0f8514010000 | cmp ecx, 0x80000 // 4c8d2d32560a00 | dec eax // 41b804010000 | lea eax, [esp + 0x40] // 668935???????? | $sequence_13 = { 4883ec40 488bea 488b8db0000000 4885c9 } // n = 4, score = 100 // 4883ec40 | mul edx // 488bea | shr edx, 3 // 488b8db0000000 | cmp edx, 0xa // 4885c9 | inc ecx $sequence_14 = { c6043e00 8b4b08 85c9 7407 57 56 } // n = 6, score = 100 // c6043e00 | xor esi, esi // 8b4b08 | mov eax, dword ptr [esp + 0x1c] // 85c9 | cmp eax, 0x208 // 7407 | jae 0xffffff89 // 57 | cmp eax, edi // 56 | je 0xffffff89 $sequence_15 = { 57 6a00 6a01 6a02 ff15???????? 8b8c2490010000 } // n = 6, score = 100 // 57 | mov eax, dword ptr [ebx + 0x30] // 6a00 | push ecx // 6a01 | mov ecx, dword ptr [ebx + 0x2c] // 6a02 | push edx // ff15???????? | // 8b8c2490010000 | push ebp $sequence_16 = { 41f6c320 7405 0c80 418800 4180fa0f 0f8625feffff 41800801 } // n = 7, score = 100 // 41f6c320 | dec eax // 7405 | lea edx, [0x1190] // 0c80 | dec eax // 418800 | sub edx, eax // 4180fa0f | mov eax, 0xcccccccd // 0f8625feffff | inc ecx // 41800801 | inc eax $sequence_17 = { 4d85c9 7444 4c2bca 0f1f840000000000 430fb60c01 8d41bf 3c19 } // n = 7, score = 100 // 4d85c9 | dec eax // 7444 | lea eax, [esp + 0x80] // 4c2bca | dec ebp // 0f1f840000000000 | test ecx, ecx // 430fb60c01 | je 0x49 // 8d41bf | dec esp // 3c19 | sub ecx, edx $sequence_18 = { 83f801 7e1d f0ff0d???????? 488d0d0a120000 ff15???????? 33c9 ff15???????? } // n = 7, score = 100 // 83f801 | test bl, 0x20 // 7e1d | je 0xb // f0ff0d???????? | // 488d0d0a120000 | or al, 0x80 // ff15???????? | // 33c9 | inc ecx // ff15???????? | $sequence_19 = { 33c0 e9???????? c784249800000030000000 4c89b424a0000000 c78424b000000040000000 488d842480000000 } // n = 6, score = 100 // 33c0 | xor eax, eax // e9???????? | // c784249800000030000000 | mov dword ptr [esp + 0x98], 0x30 // 4c89b424a0000000 | dec esp // c78424b000000040000000 | mov dword ptr [esp + 0xa0], esi // 488d842480000000 | mov dword ptr [esp + 0xb0], 0x40 $sequence_20 = { ffd3 448b05???????? 488b0d???????? 33d2 48893d???????? } // n = 5, score = 100 // ffd3 | dec eax // 448b05???????? | // 488b0d???????? | // 33d2 | mov dword ptr [esp + 0x28], eax // 48893d???????? | $sequence_21 = { 8b4330 51 8b4b2c 52 55 50 51 } // n = 7, score = 100 // 8b4330 | jne 0x42 // 51 | lea eax, [esp + 0x14] // 8b4b2c | mov ecx, esi // 52 | mov ebx, ecx // 55 | push ebp // 50 | push esi // 51 | push edi $sequence_22 = { b8cdcccccc 41ffc0 f7e2 c1ea03 83fa0a } // n = 5, score = 100 // b8cdcccccc | div edx // 41ffc0 | test edx, edx // f7e2 | je 0xd // c1ea03 | cmp word ptr [eax], bx // 83fa0a | jne 0xfffffffc $sequence_23 = { e8???????? 4c8d1de5660100 4c895c2428 488d15e1ce0100 488d4c2428 } // n = 5, score = 100 // e8???????? | // 4c8d1de5660100 | push esi // 4c895c2428 | push edi // 488d15e1ce0100 | push 0 // 488d4c2428 | push 1 condition: 7 of them and filesize < 1581056 }
rule win_winnti_w0 { meta: author = "BR Data" source = "https://github.com/br-data/2019-winnti-analyse/" date = "2019-07-24" description = "rules used for retrohunting by BR Data." malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.winnti" malpedia_version = "20190822" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $load_magic = { C7 44 ?? ?? FF D8 FF E0 } $iter = { E9 EA EB EC ED EE EF F0 } $jpeg = { FF D8 FF E0 00 00 00 00 00 00 } condition: uint16(0) == 0x5a4d and $jpeg and ($load_magic or $iter in (@jpeg[1]..@jpeg[1]+200)) and for any i in (1..#jpeg): ( uint8(@jpeg[i] + 11) != 0 ) }
rule win_winnti_w1 { meta: author = "BR Data" source = "https://github.com/br-data/2019-winnti-analyse/" date = "2019-07-24" description = "rules used for retrohunting by BR Data." malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.winnti" malpedia_version = "20190822" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $cooper = "Cooper" $pattern = { e9 ea eb ec ed ee ef f0} condition: uint16(0) == 0x5a4d and $cooper and ($pattern in (@cooper[1]..@cooper[1]+100)) }
rule win_winnti_w2 { meta: source = "https://www.verfassungsschutz.de/download/anlage-2019-12-bfv-cyber-brief-2019-01.txt" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.winnti" malpedia_version = "20191207" malpedia_sharing = "TLP:WHITE" strings: $e1 = "Global\\BFE_Notify_Event_{65a097fe-6102-446a-9f9c-55dfc3f411015}" ascii nocase $e2 = "Global\\BFE_Notify_Event_{65a097fe-6102-446a-9f9c-55dfc3f411014}" ascii nocase $e3 = "Global\\BFE_Notify_Event_{65a097fe-6102-446a-9f9c-55dfc3f411016}" ascii nocase $e4 = "\\BaseNamedObjects\\{B2B87CCA-66BC-4C24-89B2-C23C9EAC2A66}" wide $e5 = "BFE_Notify_Event_{7D00FA3C-FBDC-4A8D-AEEB-3F55A4890D2A}" nocase condition: (any of ($e*)) }
rule win_winnti_w3 { meta: source = "https://www.verfassungsschutz.de/download/anlage-2019-12-bfv-cyber-brief-2019-01.txt" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.winnti" malpedia_version = "20191207" malpedia_sharing = "TLP:WHITE" strings: $a1 = "IPSecMiniPort" wide fullword $a2 = "ndis6fw" wide fullword $a3 = "TCPIP" wide fullword $a4 = "NDIS.SYS" ascii fullword $a5 = "ntoskrnl.exe" ascii fullword $a6 = "\\BaseNamedObjects\\{B2B87CCA-66BC-4C24-89B2-C23C9EAC2A66}" wide $a7 = "\\Device\\Null" wide $a8 = "\\Device" wide $a9 = "\\Driver" wide $b1 = { 66 81 7? ?? 70 17 } $b2 = { 81 7? ?? 07 E0 15 00 } $b3 = { 8B 46 18 3D 03 60 15 00 } condition: (6 of ($a*)) and (2 of ($b*)) }
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