rule win_industroyer2_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.industroyer2."
        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.industroyer2"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 8b55fc 8b4204 88480c 0fb64d20 83f92e 7542 }
            // n = 6, score = 100
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   8b4204               | mov                 eax, dword ptr [edx + 4]
            //   88480c               | mov                 byte ptr [eax + 0xc], cl
            //   0fb64d20             | movzx               ecx, byte ptr [ebp + 0x20]
            //   83f92e               | cmp                 ecx, 0x2e
            //   7542                 | jne                 0x44

        $sequence_1 = { 7307 33c0 e9???????? 8b55f4 3b55e8 0f83ac000000 }
            // n = 6, score = 100
            //   7307                 | jae                 9
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]
            //   3b55e8               | cmp                 edx, dword ptr [ebp - 0x18]
            //   0f83ac000000         | jae                 0xb2

        $sequence_2 = { 8b55a0 52 e8???????? 8b4dec 89410c 8b55fc 83c201 }
            // n = 7, score = 100
            //   8b55a0               | mov                 edx, dword ptr [ebp - 0x60]
            //   52                   | push                edx
            //   e8????????           |                     
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]
            //   89410c               | mov                 dword ptr [ecx + 0xc], eax
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   83c201               | add                 edx, 1

        $sequence_3 = { 747e 6a00 6a00 8b450c 50 }
            // n = 5, score = 100
            //   747e                 | je                  0x80
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   50                   | push                eax

        $sequence_4 = { 0fb64205 83c002 50 68???????? e8???????? 50 }
            // n = 6, score = 100
            //   0fb64205             | movzx               eax, byte ptr [edx + 5]
            //   83c002               | add                 eax, 2
            //   50                   | push                eax
            //   68????????           |                     
            //   e8????????           |                     
            //   50                   | push                eax

        $sequence_5 = { 8b4d18 81c11d000100 51 68???????? e8???????? }
            // n = 5, score = 100
            //   8b4d18               | mov                 ecx, dword ptr [ebp + 0x18]
            //   81c11d000100         | add                 ecx, 0x1001d
            //   51                   | push                ecx
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_6 = { 8b44c114 8b4df8 8b75fc 8954ce18 8944ce1c c745e800000000 c745ec00000000 }
            // n = 7, score = 100
            //   8b44c114             | mov                 eax, dword ptr [ecx + eax*8 + 0x14]
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   8b75fc               | mov                 esi, dword ptr [ebp - 4]
            //   8954ce18             | mov                 dword ptr [esi + ecx*8 + 0x18], edx
            //   8944ce1c             | mov                 dword ptr [esi + ecx*8 + 0x1c], eax
            //   c745e800000000       | mov                 dword ptr [ebp - 0x18], 0
            //   c745ec00000000       | mov                 dword ptr [ebp - 0x14], 0

        $sequence_7 = { 8b45f8 8b4d0c 8a1411 889405e8feffff ebcd 6a08 e8???????? }
            // n = 7, score = 100
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   8a1411               | mov                 dl, byte ptr [ecx + edx]
            //   889405e8feffff       | mov                 byte ptr [ebp + eax - 0x118], dl
            //   ebcd                 | jmp                 0xffffffcf
            //   6a08                 | push                8
            //   e8????????           |                     

        $sequence_8 = { e9???????? 837d0800 740e 837d1000 7408 8b4d0c }
            // n = 6, score = 100
            //   e9????????           |                     
            //   837d0800             | cmp                 dword ptr [ebp + 8], 0
            //   740e                 | je                  0x10
            //   837d1000             | cmp                 dword ptr [ebp + 0x10], 0
            //   7408                 | je                  0xa
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]

        $sequence_9 = { 8b45d8 99 f7790c 85d2 7514 }
            // n = 5, score = 100
            //   8b45d8               | mov                 eax, dword ptr [ebp - 0x28]
            //   99                   | cdq                 
            //   f7790c               | idiv                dword ptr [ecx + 0xc]
            //   85d2                 | test                edx, edx
            //   7514                 | jne                 0x16

    condition:
        7 of them and filesize < 100352
}

// Created by Nozomi Networks Labs

rule win_industroyer2_w0 {
    meta:
        author = "Nozomi Networks Labs"
        name = "Industroyer2"
        description = "Industroyer2 malware targeting power grid components."
        actor = "Sandworm"
        source="https://www.nozominetworks.com/downloads/US/Nozomi-Networks-WP-Industroyer2.pdf"
        hash = "D69665F56DDEF7AD4E71971F06432E59F1510A7194386E5F0E8926AEA7B88E00"

        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.industroyer2"
        malpedia_rule_date = "20220905"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220905"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
    strings:
        $s1 = "%02d:%lS" wide ascii
        $s2 = "PService_PPD.exe" wide ascii
        $s3 = "D:\\OIK\\DevCounter" wide ascii
        $s4 = "MSTR ->> SLV" fullword wide ascii
        $s5 = "MSTR <<- SLV" fullword wide ascii
        $s6 = "Current operation : %s"
        $s7 = "Switch value: %s"
        $s8 = "Unknown APDU format !!!"
        $s9 = "Length:%u bytes |"
        $s10 = "Sent=x%X | Received=x%X"
        $s11 = "ASDU:%u | OA:%u | IOA:%u |"
        $s12 = "Cause: %s (x%X) | Telegram type: %s (x%X)"

    condition:
        5 of them
}