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rule win_zerot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.zerot." 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.zerot" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { e8???????? 83c404 33f6 eb13 6800006000 e8???????? } // n = 6, score = 200 // e8???????? | // 83c404 | add esp, 4 // 33f6 | xor esi, esi // eb13 | jmp 0x15 // 6800006000 | push 0x600000 // e8???????? | $sequence_1 = { c78524fdffff40000000 50 6a00 ffd6 8d8524fdffff 50 } // n = 6, score = 200 // c78524fdffff40000000 | mov dword ptr [ebp - 0x2dc], 0x40 // 50 | push eax // 6a00 | push 0 // ffd6 | call esi // 8d8524fdffff | lea eax, [ebp - 0x2dc] // 50 | push eax $sequence_2 = { ffb52ccdffff 81c200020000 e8???????? 8d8d10fdffff } // n = 4, score = 200 // ffb52ccdffff | push dword ptr [ebp - 0x32d4] // 81c200020000 | add edx, 0x200 // e8???????? | // 8d8d10fdffff | lea ecx, [ebp - 0x2f0] $sequence_3 = { 6a00 6813000020 ff760c ff15???????? 85c0 740c 81bdecf9ffffc8000000 } // n = 7, score = 200 // 6a00 | push 0 // 6813000020 | push 0x20000013 // ff760c | push dword ptr [esi + 0xc] // ff15???????? | // 85c0 | test eax, eax // 740c | je 0xe // 81bdecf9ffffc8000000 | cmp dword ptr [ebp - 0x614], 0xc8 $sequence_4 = { 6800080000 8d857cf6ffff 6a00 50 e8???????? 0f1005???????? } // n = 6, score = 200 // 6800080000 | push 0x800 // 8d857cf6ffff | lea eax, [ebp - 0x984] // 6a00 | push 0 // 50 | push eax // e8???????? | // 0f1005???????? | $sequence_5 = { c7458401000000 33c0 66894588 8d459c 50 } // n = 5, score = 200 // c7458401000000 | mov dword ptr [ebp - 0x7c], 1 // 33c0 | xor eax, eax // 66894588 | mov word ptr [ebp - 0x78], ax // 8d459c | lea eax, [ebp - 0x64] // 50 | push eax $sequence_6 = { 0f2805???????? 6a40 0f1145cc 6a00 0f2805???????? } // n = 5, score = 200 // 0f2805???????? | // 6a40 | push 0x40 // 0f1145cc | movups xmmword ptr [ebp - 0x34], xmm0 // 6a00 | push 0 // 0f2805???????? | $sequence_7 = { 6a00 6a00 ff15???????? 0f1005???????? a1???????? } // n = 5, score = 200 // 6a00 | push 0 // 6a00 | push 0 // ff15???????? | // 0f1005???????? | // a1???????? | $sequence_8 = { 57 6aff 50 6a00 6a00 ffd3 8b4608 } // n = 7, score = 200 // 57 | push edi // 6aff | push -1 // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 // ffd3 | call ebx // 8b4608 | mov eax, dword ptr [esi + 8] $sequence_9 = { 668945ed 8845ef 8d4590 50 0f1145d1 } // n = 5, score = 200 // 668945ed | mov word ptr [ebp - 0x13], ax // 8845ef | mov byte ptr [ebp - 0x11], al // 8d4590 | lea eax, [ebp - 0x70] // 50 | push eax // 0f1145d1 | movups xmmword ptr [ebp - 0x2f], xmm0 condition: 7 of them and filesize < 303104 }
rule win_zerot_w0 { meta: description = "Detects malware from the Proofpoint CN APT ZeroT incident" author = "Florian Roth" reference = "https://www.proofpoint.com/us/threat-insight/post/APT-targets-russia-belarus-zerot-plugx" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.zerot" malpedia_version = "20180301" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s6 = "jGetgQ|0h9=" fullword ascii condition: ( 10 of ($s*) ) or ( all of them ) }
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