rule win_equationdrug_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-12-06"
        version = "1"
        description = "Detects win.equationdrug."
        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.equationdrug"
        malpedia_rule_date = "20231130"
        malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351"
        malpedia_version = "20230808"
        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 = { 5b c21000 8bd0 56 81e2ff0f0000 53 83c704 }
            // n = 7, score = 100
            //   5b                   | pop                 ebx
            //   c21000               | ret                 0x10
            //   8bd0                 | mov                 edx, eax
            //   56                   | push                esi
            //   81e2ff0f0000         | and                 edx, 0xfff
            //   53                   | push                ebx
            //   83c704               | add                 edi, 4

        $sequence_1 = { 0f84f4000000 8b7c2414 f7c7ff010000 0f85e4000000 8b4e04 8d442410 50 }
            // n = 7, score = 100
            //   0f84f4000000         | je                  0xfa
            //   8b7c2414             | mov                 edi, dword ptr [esp + 0x14]
            //   f7c7ff010000         | test                edi, 0x1ff
            //   0f85e4000000         | jne                 0xea
            //   8b4e04               | mov                 ecx, dword ptr [esi + 4]
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   50                   | push                eax

        $sequence_2 = { 56 8d4c2418 c644245800 e8???????? 8d4c2414 e8???????? 84c0 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   8d4c2418             | lea                 ecx, [esp + 0x18]
            //   c644245800           | mov                 byte ptr [esp + 0x58], 0
            //   e8????????           |                     
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   e8????????           |                     
            //   84c0                 | test                al, al

        $sequence_3 = { 84c0 741a 668b4ef8 660fbed0 668b46fa 52 50 }
            // n = 7, score = 100
            //   84c0                 | test                al, al
            //   741a                 | je                  0x1c
            //   668b4ef8             | mov                 cx, word ptr [esi - 8]
            //   660fbed0             | movsx               dx, al
            //   668b46fa             | mov                 ax, word ptr [esi - 6]
            //   52                   | push                edx
            //   50                   | push                eax

        $sequence_4 = { 89542414 8b542410 0fbfc2 40 0fafc1 3bfb 73c4 }
            // n = 7, score = 100
            //   89542414             | mov                 dword ptr [esp + 0x14], edx
            //   8b542410             | mov                 edx, dword ptr [esp + 0x10]
            //   0fbfc2               | movsx               eax, dx
            //   40                   | inc                 eax
            //   0fafc1               | imul                eax, ecx
            //   3bfb                 | cmp                 edi, ebx
            //   73c4                 | jae                 0xffffffc6

        $sequence_5 = { c644245c00 e8???????? 83c404 89442464 85c0 c644245802 7411 }
            // n = 7, score = 100
            //   c644245c00           | mov                 byte ptr [esp + 0x5c], 0
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   89442464             | mov                 dword ptr [esp + 0x64], eax
            //   85c0                 | test                eax, eax
            //   c644245802           | mov                 byte ptr [esp + 0x58], 2
            //   7411                 | je                  0x13

        $sequence_6 = { e8???????? 85c0 0f864b020000 53 8bcd e8???????? 50 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   0f864b020000         | jbe                 0x251
            //   53                   | push                ebx
            //   8bcd                 | mov                 ecx, ebp
            //   e8????????           |                     
            //   50                   | push                eax

        $sequence_7 = { 33c0 eb07 8b4708 2bc6 d1f8 33d2 33db }
            // n = 7, score = 100
            //   33c0                 | xor                 eax, eax
            //   eb07                 | jmp                 9
            //   8b4708               | mov                 eax, dword ptr [edi + 8]
            //   2bc6                 | sub                 eax, esi
            //   d1f8                 | sar                 eax, 1
            //   33d2                 | xor                 edx, edx
            //   33db                 | xor                 ebx, ebx

        $sequence_8 = { 8bca b001 83e103 f3a4 5f 5e 5d }
            // n = 7, score = 100
            //   8bca                 | mov                 ecx, edx
            //   b001                 | mov                 al, 1
            //   83e103               | and                 ecx, 3
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp

        $sequence_9 = { 6685c0 7537 8b442408 3dffff0000 772c c1e009 }
            // n = 6, score = 100
            //   6685c0               | test                ax, ax
            //   7537                 | jne                 0x39
            //   8b442408             | mov                 eax, dword ptr [esp + 8]
            //   3dffff0000           | cmp                 eax, 0xffff
            //   772c                 | ja                  0x2e
            //   c1e009               | shl                 eax, 9

    condition:
        7 of them and filesize < 449536
}

/* EquationDrug Update 11.03.2015 - http://securelist.com/blog/research/69203/inside-the-equationdrug-espionage-platform/ */

rule win_equationdrug_w0 {
	meta:
		description = "EquationDrug - Backdoor driven by network sniffer - mstcp32.sys, fat32.sys"
		author = "Florian Roth @4nc4p"
		reference = "http://securelist.com/blog/research/69203/inside-the-equationdrug-espionage-platform/"
		date = "2015/03/11"
		hash = "26e787997a338d8111d96c9a4c103cf8ff0201ce"
		source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/Equation.yar"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.equationdrug"
        malpedia_version = "20170517"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
	strings:
		$s0 = "Microsoft(R) Windows (TM) Operating System" fullword wide
		$s1 = "\\Registry\\User\\CurrentUser\\" fullword wide
		$s3 = "sys\\mstcp32.dbg" fullword ascii
		$s7 = "mstcp32.sys" fullword wide
		$s8 = "p32.sys" fullword ascii
		$s9 = "\\Device\\%ws_%ws" fullword wide
		$s10 = "\\DosDevices\\%ws" fullword wide
		$s11 = "\\Device\\%ws" fullword wide
	condition:
		all of them
}