rule win_doublepulsar_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.doublepulsar."
        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.doublepulsar"
        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 = { c3 8b442404 8b8880000000 6a00 6a03 51 33c0 }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   8b8880000000         | mov                 ecx, dword ptr [eax + 0x80]
            //   6a00                 | push                0
            //   6a03                 | push                3
            //   51                   | push                ecx
            //   33c0                 | xor                 eax, eax

        $sequence_1 = { 0fb6c8 f7d9 1bc9 83e103 83c110 }
            // n = 5, score = 100
            //   0fb6c8               | movzx               ecx, al
            //   f7d9                 | neg                 ecx
            //   1bc9                 | sbb                 ecx, ecx
            //   83e103               | and                 ecx, 3
            //   83c110               | add                 ecx, 0x10

        $sequence_2 = { 894530 8b4620 8b7d65 83c703 8907 8b4628 a902000000 }
            // n = 7, score = 100
            //   894530               | mov                 dword ptr [ebp + 0x30], eax
            //   8b4620               | mov                 eax, dword ptr [esi + 0x20]
            //   8b7d65               | mov                 edi, dword ptr [ebp + 0x65]
            //   83c703               | add                 edi, 3
            //   8907                 | mov                 dword ptr [edi], eax
            //   8b4628               | mov                 eax, dword ptr [esi + 0x28]
            //   a902000000           | test                eax, 2

        $sequence_3 = { 8bf8 83c418 85ff 0f85c0010000 85db 747d 8d7c2410 }
            // n = 7, score = 100
            //   8bf8                 | mov                 edi, eax
            //   83c418               | add                 esp, 0x18
            //   85ff                 | test                edi, edi
            //   0f85c0010000         | jne                 0x1c6
            //   85db                 | test                ebx, ebx
            //   747d                 | je                  0x7f
            //   8d7c2410             | lea                 edi, [esp + 0x10]

        $sequence_4 = { e9???????? c746541c000000 015e54 e9???????? 8b8768010000 68???????? }
            // n = 6, score = 100
            //   e9????????           |                     
            //   c746541c000000       | mov                 dword ptr [esi + 0x54], 0x1c
            //   015e54               | add                 dword ptr [esi + 0x54], ebx
            //   e9????????           |                     
            //   8b8768010000         | mov                 eax, dword ptr [edi + 0x168]
            //   68????????           |                     

        $sequence_5 = { 83f810 7446 83f820 742d 83f830 7414 68???????? }
            // n = 7, score = 100
            //   83f810               | cmp                 eax, 0x10
            //   7446                 | je                  0x48
            //   83f820               | cmp                 eax, 0x20
            //   742d                 | je                  0x2f
            //   83f830               | cmp                 eax, 0x30
            //   7414                 | je                  0x16
            //   68????????           |                     

        $sequence_6 = { 31c0 f3aa 8d8500fbffff 8985cff6ffff }
            // n = 4, score = 100
            //   31c0                 | xor                 eax, eax
            //   f3aa                 | rep stosb           byte ptr es:[edi], al
            //   8d8500fbffff         | lea                 eax, [ebp - 0x500]
            //   8985cff6ffff         | mov                 dword ptr [ebp - 0x931], eax

        $sequence_7 = { 40 ebdd 41 39c8 }
            // n = 4, score = 100
            //   40                   | inc                 eax
            //   ebdd                 | jmp                 0xffffffdf
            //   41                   | inc                 ecx
            //   39c8                 | cmp                 eax, ecx

        $sequence_8 = { 0f84f8010000 39442450 0f84ee010000 57 8b7c2448 83ff23 740d }
            // n = 7, score = 100
            //   0f84f8010000         | je                  0x1fe
            //   39442450             | cmp                 dword ptr [esp + 0x50], eax
            //   0f84ee010000         | je                  0x1f4
            //   57                   | push                edi
            //   8b7c2448             | mov                 edi, dword ptr [esp + 0x48]
            //   83ff23               | cmp                 edi, 0x23
            //   740d                 | je                  0xf

        $sequence_9 = { 6a40 6800300000 50 6a00 ff5608 85c0 744b }
            // n = 7, score = 100
            //   6a40                 | push                0x40
            //   6800300000           | push                0x3000
            //   50                   | push                eax
            //   6a00                 | push                0
            //   ff5608               | call                dword ptr [esi + 8]
            //   85c0                 | test                eax, eax
            //   744b                 | je                  0x4d

    condition:
        7 of them and filesize < 122880
}

rule win_doublepulsar_w0 {
	meta:
		author = "Florian Roth"
		description = "Detects Malware from APT28 incident - SOURFACE is a downloader that obtains a second-stage backdoor from a C2 server."
		reference = "https://www.fireeye.com/blog/threat-research/2014/10/apt28-a-window-into-russias-cyber-espionage-operations.html"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.doublepulsar"
        malpedia_version = "20180301"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
   strings:
      $x1 = "[+] Ping returned Target architecture: %s - XOR Key: 0x%08X" fullword ascii
      $x2 = "[.] Sending shellcode to inject DLL" fullword ascii
      $x3 = "[-] Error setting ShellcodeFile name" fullword ascii
   condition:
      1 of them
}