SYMBOLCOMMON_NAMEaka. SYNONYMS
win.dnschanger (Back to overview)

DNSChanger


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References
2016-01-10Johannes Bader
@online{bader:20160110:dga:cb8a5e5, author = {Johannes Bader}, title = {{The DGA in Alureon/DNSChanger}}, date = {2016-01-10}, url = {https://www.johannesbader.ch/2016/01/the-dga-in-alureon-dnschanger/}, language = {English}, urldate = {2019-12-17} } The DGA in Alureon/DNSChanger
Alureon DNSChanger
Yara Rules
[TLP:WHITE] win_dnschanger_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_dnschanger_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.dnschanger"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 8b3d???????? 50 ffd7 8bf0 89742418 }
            // n = 5, score = 100
            //   8b3d????????         |                     
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   8bf0                 | mov                 esi, eax
            //   89742418             | mov                 dword ptr [esp + 0x18], esi

        $sequence_1 = { 6a08 c744241834000000 ffd5 8b35???????? }
            // n = 4, score = 100
            //   6a08                 | push                8
            //   c744241834000000     | mov                 dword ptr [esp + 0x18], 0x34
            //   ffd5                 | call                ebp
            //   8b35????????         |                     

        $sequence_2 = { 59 ff7508 53 53 }
            // n = 4, score = 100
            //   59                   | pop                 ecx
            //   ff7508               | push                dword ptr [ebp + 8]
            //   53                   | push                ebx
            //   53                   | push                ebx

        $sequence_3 = { 85c9 7430 894c2410 8d4c2408 6a00 8d542410 51 }
            // n = 7, score = 100
            //   85c9                 | test                ecx, ecx
            //   7430                 | je                  0x32
            //   894c2410             | mov                 dword ptr [esp + 0x10], ecx
            //   8d4c2408             | lea                 ecx, [esp + 8]
            //   6a00                 | push                0
            //   8d542410             | lea                 edx, [esp + 0x10]
            //   51                   | push                ecx

        $sequence_4 = { 8d4c2408 6a00 8d542410 51 52 6a08 6a01 }
            // n = 7, score = 100
            //   8d4c2408             | lea                 ecx, [esp + 8]
            //   6a00                 | push                0
            //   8d542410             | lea                 edx, [esp + 0x10]
            //   51                   | push                ecx
            //   52                   | push                edx
            //   6a08                 | push                8
            //   6a01                 | push                1

        $sequence_5 = { 8bd8 c70424???????? 53 ffd6 }
            // n = 4, score = 100
            //   8bd8                 | mov                 ebx, eax
            //   c70424????????       |                     
            //   53                   | push                ebx
            //   ffd6                 | call                esi

        $sequence_6 = { 99 46 f7fe 8bc2 03c7 eb02 }
            // n = 6, score = 100
            //   99                   | cdq                 
            //   46                   | inc                 esi
            //   f7fe                 | idiv                esi
            //   8bc2                 | mov                 eax, edx
            //   03c7                 | add                 eax, edi
            //   eb02                 | jmp                 4

        $sequence_7 = { 8b6c241c 8b74240c 33db 85f6 894500 7447 }
            // n = 6, score = 100
            //   8b6c241c             | mov                 ebp, dword ptr [esp + 0x1c]
            //   8b74240c             | mov                 esi, dword ptr [esp + 0xc]
            //   33db                 | xor                 ebx, ebx
            //   85f6                 | test                esi, esi
            //   894500               | mov                 dword ptr [ebp], eax
            //   7447                 | je                  0x49

        $sequence_8 = { 8d45f8 8b3d???????? 50 6a00 6a00 6a03 ff75fc }
            // n = 7, score = 100
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   8b3d????????         |                     
            //   50                   | push                eax
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a03                 | push                3
            //   ff75fc               | push                dword ptr [ebp - 4]

        $sequence_9 = { 50 ffd6 8bf8 8b8b9c010000 8d442410 }
            // n = 5, score = 100
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   8bf8                 | mov                 edi, eax
            //   8b8b9c010000         | mov                 ecx, dword ptr [ebx + 0x19c]
            //   8d442410             | lea                 eax, [esp + 0x10]

    condition:
        7 of them and filesize < 49152
}
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