rule win_equationdrug_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 83c414 c20800 5f 5e 5d 66b80100 }
            // n = 6, score = 100
            //   83c414               | add                 esp, 0x14
            //   c20800               | ret                 8
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   66b80100             | mov                 ax, 1

        $sequence_1 = { 889c244c010000 3bf3 8d4c243c 741d e8???????? 8d4c2410 }
            // n = 6, score = 100
            //   889c244c010000       | mov                 byte ptr [esp + 0x14c], bl
            //   3bf3                 | cmp                 esi, ebx
            //   8d4c243c             | lea                 ecx, [esp + 0x3c]
            //   741d                 | je                  0x1f
            //   e8????????           |                     
            //   8d4c2410             | lea                 ecx, [esp + 0x10]

        $sequence_2 = { 64892500000000 83ec38 56 57 8b7c2454 }
            // n = 5, score = 100
            //   64892500000000       | mov                 dword ptr fs:[0], esp
            //   83ec38               | sub                 esp, 0x38
            //   56                   | push                esi
            //   57                   | push                edi
            //   8b7c2454             | mov                 edi, dword ptr [esp + 0x54]

        $sequence_3 = { e8???????? 6685c0 740c b842070000 5e 83c41c c20800 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   6685c0               | test                ax, ax
            //   740c                 | je                  0xe
            //   b842070000           | mov                 eax, 0x742
            //   5e                   | pop                 esi
            //   83c41c               | add                 esp, 0x1c
            //   c20800               | ret                 8

        $sequence_4 = { 51 8bcf e8???????? 6685c0 755b 8d542414 8d442408 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   6685c0               | test                ax, ax
            //   755b                 | jne                 0x5d
            //   8d542414             | lea                 edx, [esp + 0x14]
            //   8d442408             | lea                 eax, [esp + 8]

        $sequence_5 = { 56 6a00 6a31 6a07 8bcf c7402000000000 e8???????? }
            // n = 7, score = 100
            //   56                   | push                esi
            //   6a00                 | push                0
            //   6a31                 | push                0x31
            //   6a07                 | push                7
            //   8bcf                 | mov                 ecx, edi
            //   c7402000000000       | mov                 dword ptr [eax + 0x20], 0
            //   e8????????           |                     

        $sequence_6 = { 8b6f04 896b04 668b7f08 66897b08 75e0 8b7c2414 8b742410 }
            // n = 7, score = 100
            //   8b6f04               | mov                 ebp, dword ptr [edi + 4]
            //   896b04               | mov                 dword ptr [ebx + 4], ebp
            //   668b7f08             | mov                 di, word ptr [edi + 8]
            //   66897b08             | mov                 word ptr [ebx + 8], di
            //   75e0                 | jne                 0xffffffe2
            //   8b7c2414             | mov                 edi, dword ptr [esp + 0x14]
            //   8b742410             | mov                 esi, dword ptr [esp + 0x10]

        $sequence_7 = { f7d1 49 6a01 8d4401ff 40 50 e8???????? }
            // n = 7, score = 100
            //   f7d1                 | not                 ecx
            //   49                   | dec                 ecx
            //   6a01                 | push                1
            //   8d4401ff             | lea                 eax, [ecx + eax - 1]
            //   40                   | inc                 eax
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_8 = { 7505 397006 730f 83c00a 3bc2 75ed }
            // n = 6, score = 100
            //   7505                 | jne                 7
            //   397006               | cmp                 dword ptr [eax + 6], esi
            //   730f                 | jae                 0x11
            //   83c00a               | add                 eax, 0xa
            //   3bc2                 | cmp                 eax, edx
            //   75ed                 | jne                 0xffffffef

        $sequence_9 = { 8b742428 53 8b5c2428 c744241800000000 8b11 03c3 50 }
            // n = 7, score = 100
            //   8b742428             | mov                 esi, dword ptr [esp + 0x28]
            //   53                   | push                ebx
            //   8b5c2428             | mov                 ebx, dword ptr [esp + 0x28]
            //   c744241800000000     | mov                 dword ptr [esp + 0x18], 0
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   03c3                 | add                 eax, ebx
            //   50                   | push                eax

    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
}