rule win_dadstache_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.dadstache."
        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.dadstache"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 0f1145e8 0f85f2feffff 8b7df4 8bc7 c1e818 }
            // n = 5, score = 500
            //   0f1145e8             | movups              xmmword ptr [ebp - 0x18], xmm0
            //   0f85f2feffff         | jne                 0xfffffef8
            //   8b7df4               | mov                 edi, dword ptr [ebp - 0xc]
            //   8bc7                 | mov                 eax, edi
            //   c1e818               | shr                 eax, 0x18

        $sequence_1 = { c6437401 50 53 c7070c000000 c7431400000000 c7431801000000 }
            // n = 6, score = 500
            //   c6437401             | mov                 byte ptr [ebx + 0x74], 1
            //   50                   | push                eax
            //   53                   | push                ebx
            //   c7070c000000         | mov                 dword ptr [edi], 0xc
            //   c7431400000000       | mov                 dword ptr [ebx + 0x14], 0
            //   c7431801000000       | mov                 dword ptr [ebx + 0x18], 1

        $sequence_2 = { 75f9 2bf2 7429 90 6a00 }
            // n = 5, score = 500
            //   75f9                 | jne                 0xfffffffb
            //   2bf2                 | sub                 esi, edx
            //   7429                 | je                  0x2b
            //   90                   | nop                 
            //   6a00                 | push                0

        $sequence_3 = { 41 84c0 75f9 e9???????? 80f902 0f85f8000000 8b830c020000 }
            // n = 7, score = 500
            //   41                   | inc                 ecx
            //   84c0                 | test                al, al
            //   75f9                 | jne                 0xfffffffb
            //   e9????????           |                     
            //   80f902               | cmp                 cl, 2
            //   0f85f8000000         | jne                 0xfe
            //   8b830c020000         | mov                 eax, dword ptr [ebx + 0x20c]

        $sequence_4 = { 7454 6a00 ff35???????? ff15???????? 85c0 }
            // n = 5, score = 500
            //   7454                 | je                  0x56
            //   6a00                 | push                0
            //   ff35????????         |                     
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_5 = { ffb01c020000 ff15???????? 85c0 0f8584000000 }
            // n = 4, score = 500
            //   ffb01c020000         | push                dword ptr [eax + 0x21c]
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f8584000000         | jne                 0x8a

        $sequence_6 = { bb04000000 c1e108 8bf7 0bc8 c745d801000000 0fb64201 }
            // n = 6, score = 500
            //   bb04000000           | mov                 ebx, 4
            //   c1e108               | shl                 ecx, 8
            //   8bf7                 | mov                 esi, edi
            //   0bc8                 | or                  ecx, eax
            //   c745d801000000       | mov                 dword ptr [ebp - 0x28], 1
            //   0fb64201             | movzx               eax, byte ptr [edx + 1]

        $sequence_7 = { 57 8bf9 897df4 85db 7419 }
            // n = 5, score = 500
            //   57                   | push                edi
            //   8bf9                 | mov                 edi, ecx
            //   897df4               | mov                 dword ptr [ebp - 0xc], edi
            //   85db                 | test                ebx, ebx
            //   7419                 | je                  0x1b

        $sequence_8 = { 8b0e 33d2 33db 8955f4 8b56f8 c745e400000000 }
            // n = 6, score = 200
            //   8b0e                 | mov                 ecx, dword ptr [esi]
            //   33d2                 | xor                 edx, edx
            //   33db                 | xor                 ebx, ebx
            //   8955f4               | mov                 dword ptr [ebp - 0xc], edx
            //   8b56f8               | mov                 edx, dword ptr [esi - 8]
            //   c745e400000000       | mov                 dword ptr [ebp - 0x1c], 0

        $sequence_9 = { 660f383ffc 0f28c7 894df8 660f73d808 660f383ff8 }
            // n = 5, score = 200
            //   660f383ffc           | pmaxud              xmm7, xmm4
            //   0f28c7               | movaps              xmm0, xmm7
            //   894df8               | mov                 dword ptr [ebp - 8], ecx
            //   660f73d808           | psrldq              xmm0, 8
            //   660f383ff8           | pmaxud              xmm7, xmm0

        $sequence_10 = { 56 ff7034 ffd7 8945f8 }
            // n = 4, score = 200
            //   56                   | push                esi
            //   ff7034               | push                dword ptr [eax + 0x34]
            //   ffd7                 | call                edi
            //   8945f8               | mov                 dword ptr [ebp - 8], eax

        $sequence_11 = { 0f44d8 c745f8616c4672 8d45e8 66c745fc6565 50 57 c645fe00 }
            // n = 7, score = 200
            //   0f44d8               | cmove               ebx, eax
            //   c745f8616c4672       | mov                 dword ptr [ebp - 8], 0x72466c61
            //   8d45e8               | lea                 eax, [ebp - 0x18]
            //   66c745fc6565         | mov                 word ptr [ebp - 4], 0x6565
            //   50                   | push                eax
            //   57                   | push                edi
            //   c645fe00             | mov                 byte ptr [ebp - 2], 0

        $sequence_12 = { 7405 0d00020000 8d5de4 53 50 51 }
            // n = 6, score = 200
            //   7405                 | je                  7
            //   0d00020000           | or                  eax, 0x200
            //   8d5de4               | lea                 ebx, [ebp - 0x1c]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   51                   | push                ecx

        $sequence_13 = { 8bec 81ec9c000000 56 57 648b3d30000000 33c0 c745806b006500 }
            // n = 7, score = 200
            //   8bec                 | mov                 ebp, esp
            //   81ec9c000000         | sub                 esp, 0x9c
            //   56                   | push                esi
            //   57                   | push                edi
            //   648b3d30000000       | mov                 edi, dword ptr fs:[0x30]
            //   33c0                 | xor                 eax, eax
            //   c745806b006500       | mov                 dword ptr [ebp - 0x80], 0x65006b

        $sequence_14 = { 57 8d3c16 897df4 85c9 }
            // n = 4, score = 200
            //   57                   | push                edi
            //   8d3c16               | lea                 edi, [esi + edx]
            //   897df4               | mov                 dword ptr [ebp - 0xc], edi
            //   85c9                 | test                ecx, ecx

        $sequence_15 = { 894ddc 53 56 57 85c9 0f8415010000 8b410c }
            // n = 7, score = 200
            //   894ddc               | mov                 dword ptr [ebp - 0x24], ecx
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   85c9                 | test                ecx, ecx
            //   0f8415010000         | je                  0x11b
            //   8b410c               | mov                 eax, dword ptr [ecx + 0xc]

    condition:
        7 of them and filesize < 580608
}

rule win_dadstache_w0 {
    meta:
        author =  "Elastic Security"
        description = "APT40 second stage implant"
        source = "https://www.elastic.co/blog/advanced-techniques-used-in-malaysian-focused-apt-campaign"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.dadstache"
        malpedia_version = "20200626"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
    strings:
        $a = "/list_direction" fullword wide
        $b = "/post_document" fullword wide
        $c = "/postlogin" fullword wide
        $d = "Download Read Path Failed %s" fullword ascii
        $e = "Open Pipe Failed %s" fullword ascii
        $f = "Open Remote File %s Failed For: %s" fullword ascii
        $g = "Download Read Path Failed %s" fullword ascii
        $h = "\\cmd.exe" fullword wide
    condition:
        all of them
}