rule win_sinowal_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.sinowal."
        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.sinowal"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 833c8100 7421 8b55fc 83c201 52 }
            // n = 5, score = 200
            //   833c8100             | cmp                 dword ptr [ecx + eax*4], 0
            //   7421                 | je                  0x23
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   83c201               | add                 edx, 1
            //   52                   | push                edx

        $sequence_1 = { 394dfc 732e 8b55fc 8b4508 8a0c50 }
            // n = 5, score = 200
            //   394dfc               | cmp                 dword ptr [ebp - 4], ecx
            //   732e                 | jae                 0x30
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8a0c50               | mov                 cl, byte ptr [eax + edx*2]

        $sequence_2 = { 6a00 6a01 6800000040 8b4d08 8b11 52 }
            // n = 6, score = 200
            //   6a00                 | push                0
            //   6a01                 | push                1
            //   6800000040           | push                0x40000000
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   52                   | push                edx

        $sequence_3 = { 8d7dc4 f3a5 837d0800 7406 837d0c00 750a b805400080 }
            // n = 7, score = 200
            //   8d7dc4               | lea                 edi, [ebp - 0x3c]
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   837d0800             | cmp                 dword ptr [ebp + 8], 0
            //   7406                 | je                  8
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   750a                 | jne                 0xc
            //   b805400080           | mov                 eax, 0x80004005

        $sequence_4 = { 50 0fb60d???????? 51 0fb615???????? 52 }
            // n = 5, score = 200
            //   50                   | push                eax
            //   0fb60d????????       |                     
            //   51                   | push                ecx
            //   0fb615????????       |                     
            //   52                   | push                edx

        $sequence_5 = { 83c434 c745e800000000 33d2 7596 837de800 7417 }
            // n = 6, score = 200
            //   83c434               | add                 esp, 0x34
            //   c745e800000000       | mov                 dword ptr [ebp - 0x18], 0
            //   33d2                 | xor                 edx, edx
            //   7596                 | jne                 0xffffff98
            //   837de800             | cmp                 dword ptr [ebp - 0x18], 0
            //   7417                 | je                  0x19

        $sequence_6 = { 837d0800 7406 837d0c00 7502 eb64 8b450c }
            // n = 6, score = 200
            //   837d0800             | cmp                 dword ptr [ebp + 8], 0
            //   7406                 | je                  8
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   7502                 | jne                 4
            //   eb64                 | jmp                 0x66
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]

        $sequence_7 = { e8???????? 8945f8 8955fc 8b8580fdffff c1e802 50 6a01 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   8955fc               | mov                 dword ptr [ebp - 4], edx
            //   8b8580fdffff         | mov                 eax, dword ptr [ebp - 0x280]
            //   c1e802               | shr                 eax, 2
            //   50                   | push                eax
            //   6a01                 | push                1

        $sequence_8 = { 8bec 83ec18 c745f800000000 c745fc00000000 c745e800000000 }
            // n = 5, score = 200
            //   8bec                 | mov                 ebp, esp
            //   83ec18               | sub                 esp, 0x18
            //   c745f800000000       | mov                 dword ptr [ebp - 8], 0
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   c745e800000000       | mov                 dword ptr [ebp - 0x18], 0

        $sequence_9 = { 7418 8b55e8 3b55f8 7510 8b45ec 3b45fc 7508 }
            // n = 7, score = 200
            //   7418                 | je                  0x1a
            //   8b55e8               | mov                 edx, dword ptr [ebp - 0x18]
            //   3b55f8               | cmp                 edx, dword ptr [ebp - 8]
            //   7510                 | jne                 0x12
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   3b45fc               | cmp                 eax, dword ptr [ebp - 4]
            //   7508                 | jne                 0xa

    condition:
        7 of them and filesize < 73728
}

/*
    This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or organization, as    long as you use it under this license.

*/

rule win_sinowal_w0 {
    meta:
        description = "Quarian Identifying Strings"
        author = "Seth Hardy"
        last_modified = "2014-07-09"
		source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/Quarian.yar"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.sinowal"
        malpedia_version = "20170517"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
        
    strings:
        $ = "s061779s061750"
        $ = "[OnUpLoadFile]"
        $ = "[OnDownLoadFile]"
        $ = "[FileTransfer]"
        $ = "---- Not connect the Manager, so start UnInstall ----"
        $ = "------- Enter CompressDownLoadDir ---------"
        $ = "------- Enter DownLoadDirectory ---------"
        $ = "[HandleAdditionalData]"
        $ = "[mswsocket.dll]"
        $ = "msupdate.dll........Enter ThreadCmd!"
        $ = "ok1-1"
        $ = "msupdate_tmp.dll"
        $ = "replace Rpcss.dll successfully!"
        $ = "f:\\loadhiddendriver-mdl\\objfre_win7_x86\\i386\\intelnat.pdb"
        $ = "\\drivercashe\\" wide ascii
        $ = "\\microsoft\\windwos\\" wide ascii
        $ = "\\DosDevices\\LOADHIDDENDRIVER" wide ascii
        $ = "\\Device\\LOADHIDDENDRIVER" wide ascii
        $ = "Global\\state_maping" wide ascii
        $ = "E:\\Code\\2.0\\2.0_multi-port\\2.0\\ServerInstall_New-2010-0913_sp3\\msupdataDll\\Release\\msupdate_tmp.pdb"
        $ = "Global\\unInstall_event_1554_Ower" wide ascii
        
    condition:
       any of them
}

/*
    This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or organization, as    long as you use it under this license.

*/

rule win_sinowal_w1 {
    meta:
        description = "Quarian code features"
        author = "Seth Hardy"
        last_modified = "2014-07-09"
		source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/Quarian.yar"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.sinowal"
        malpedia_version = "20170517"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
        
    strings:
        // decrypt in intelnat.sys
        $ = { C1 E? 04 8B ?? F? C1 E? 05 33 C? }
        // decrypt in mswsocket.dll
        $ = { C1 EF 05 C1 E3 04 33 FB }
        $ = { 33 D8 81 EE 47 86 C8 61 }
        // loop in msupdate.dll
        $ = { FF 45 E8 81 45 EC CC 00 00 00 E9 95 FE FF FF }
    
    condition:
        any of them
}