rule win_zerot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 740a 50 ffd7 c7460800000000 84db 0f95c0 }
            // n = 7, score = 200
            //   85c0                 | test                eax, eax
            //   740a                 | je                  0xc
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   c7460800000000       | mov                 dword ptr [esi + 8], 0
            //   84db                 | test                bl, bl
            //   0f95c0               | setne               al

        $sequence_1 = { 50 8d4d90 e8???????? 8d8672050000 }
            // n = 4, score = 200
            //   50                   | push                eax
            //   8d4d90               | lea                 ecx, [ebp - 0x70]
            //   e8????????           |                     
            //   8d8672050000         | lea                 eax, [esi + 0x572]

        $sequence_2 = { 6a00 57 e8???????? 83c408 80780100 }
            // n = 5, score = 200
            //   6a00                 | push                0
            //   57                   | push                edi
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   80780100             | cmp                 byte ptr [eax + 1], 0

        $sequence_3 = { 6880000000 8d85bcfeffff 6a00 50 e8???????? 57 8d85bcfeffff }
            // n = 7, score = 200
            //   6880000000           | push                0x80
            //   8d85bcfeffff         | lea                 eax, [ebp - 0x144]
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   57                   | push                edi
            //   8d85bcfeffff         | lea                 eax, [ebp - 0x144]

        $sequence_4 = { 6a00 ff15???????? 8bc3 8d8dfcfeffff }
            // n = 4, score = 200
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   8bc3                 | mov                 eax, ebx
            //   8d8dfcfeffff         | lea                 ecx, [ebp - 0x104]

        $sequence_5 = { 0f1f8000000000 8d857cffffff 50 56 ffd7 85c0 0f84b9000000 }
            // n = 7, score = 200
            //   0f1f8000000000       | nop                 dword ptr [eax]
            //   8d857cffffff         | lea                 eax, [ebp - 0x84]
            //   50                   | push                eax
            //   56                   | push                esi
            //   ffd7                 | call                edi
            //   85c0                 | test                eax, eax
            //   0f84b9000000         | je                  0xbf

        $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 = { ffb504faffff 6a00 6a00 ffd3 8b460c 85c0 }
            // n = 6, score = 200
            //   ffb504faffff         | push                dword ptr [ebp - 0x5fc]
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   ffd3                 | call                ebx
            //   8b460c               | mov                 eax, dword ptr [esi + 0xc]
            //   85c0                 | test                eax, eax

        $sequence_8 = { 6a00 ff750c 57 ff7604 ff15???????? }
            // n = 5, score = 200
            //   6a00                 | push                0
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   57                   | push                edi
            //   ff7604               | push                dword ptr [esi + 4]
            //   ff15????????         |                     

        $sequence_9 = { 8b8d34fdffff 85c0 bf???????? 0f44fe 83f906 7571 }
            // n = 6, score = 200
            //   8b8d34fdffff         | mov                 ecx, dword ptr [ebp - 0x2cc]
            //   85c0                 | test                eax, eax
            //   bf????????           |                     
            //   0f44fe               | cmove               edi, esi
            //   83f906               | cmp                 ecx, 6
            //   7571                 | jne                 0x73

    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 )
}