SYMBOLCOMMON_NAMEaka. SYNONYMS
win.doubleback (Back to overview)

DOUBLEBACK


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References
2021-05-04FireEyeNick Richard, Dimiter Andonov
@online{richard:20210504:unc2529:4213d1c, author = {Nick Richard and Dimiter Andonov}, title = {{The UNC2529 Triple Double: A Trifecta Phishing Campaign}}, date = {2021-05-04}, organization = {FireEye}, url = {https://www.fireeye.com/blog/threat-research/2021/05/unc2529-triple-double-trifecta-phishing-campaign.html}, language = {English}, urldate = {2021-05-19} } The UNC2529 Triple Double: A Trifecta Phishing Campaign
DOUBLEBACK
Yara Rules
[TLP:WHITE] win_doubleback_auto (20210616 | Detects win.doubleback.)
rule win_doubleback_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.doubleback."
        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.doubleback"
        malpedia_rule_date = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { eb3b b90b070000 eb34 2d63450000 7428 }
            // n = 5, score = 400
            //   eb3b                 | mov                 eax, ebx
            //   b90b070000           | mov                 byte ptr [ebx + edi], 0
            //   eb34                 | dec                 ecx
            //   2d63450000           | mov                 dword ptr [edi], edi
            //   7428                 | je                  0xcd6

        $sequence_1 = { 3dab3f0000 755e b9ad060000 eb57 b9a7060000 eb50 b947060000 }
            // n = 7, score = 400
            //   3dab3f0000           | mov                 edi, dword ptr [ebp + 4]
            //   755e                 | dec                 esp
            //   b9ad060000           | lea                 ecx, dword ptr [ebp + 8]
            //   eb57                 | inc                 esp
            //   b9a7060000           | mov                 ebp, dword ptr [esp + 0xc8]
            //   eb50                 | dec                 eax
            //   b947060000           | lea                 ecx, dword ptr [ebx + 0x210]

        $sequence_2 = { eb49 b9e7050000 eb42 b9e3050000 }
            // n = 4, score = 400
            //   eb49                 | add                 esp, 0xc
            //   b9e7050000           | mov                 eax, dword ptr [ebp - 4]
            //   eb42                 | mov                 dword ptr [ecx], eax
            //   b9e3050000           | mov                 ecx, dword ptr [ebp + 0x14]

        $sequence_3 = { 3d00280000 7438 3d5a290000 742a 3d39380000 741c }
            // n = 6, score = 400
            //   3d00280000           | mov                 dword ptr [esp + 0x20], esi
            //   7438                 | mov                 dword ptr [esp + 0x28], ebp
            //   3d5a290000           | dec                 ecx
            //   742a                 | mov                 edx, esp
            //   3d39380000           | dec                 esp
            //   741c                 | mov                 dword ptr [esp + 0x20], esi

        $sequence_4 = { b9e3050000 eb3b b90b070000 eb34 2d63450000 7428 }
            // n = 6, score = 400
            //   b9e3050000           | mov                 dword ptr [ebp + 0x48], edi
            //   eb3b                 | cmp                 eax, 0x103
            //   b90b070000           | dec                 esp
            //   eb34                 | mov                 dword ptr [esp + 0x30], edi
            //   2d63450000           | inc                 ebp
            //   7428                 | xor                 eax, eax

        $sequence_5 = { eb13 b975070000 eb0c b96f070000 eb05 }
            // n = 5, score = 400
            //   eb13                 | jmp                 0xb5a
            //   b975070000           | je                  0xb57
            //   eb0c                 | cmp                 eax, 0x3fab
            //   b96f070000           | jne                 0xbae
            //   eb05                 | mov                 ecx, 0x6ad

        $sequence_6 = { eb57 b9a7060000 eb50 b947060000 eb49 }
            // n = 5, score = 400
            //   eb57                 | je                  0xd60
            //   b9a7060000           | dec                 eax
            //   eb50                 | mov                 ecx, dword ptr [esi + 0xb5c]
            //   b947060000           | dec                 eax
            //   eb49                 | test                ecx, ecx

        $sequence_7 = { 740e 3dab3f0000 755e b9ad060000 eb57 b9a7060000 }
            // n = 6, score = 400
            //   740e                 | cmp                 al, 0x19
            //   3dab3f0000           | ja                  0xd02
            //   755e                 | inc                 ecx
            //   b9ad060000           | add                 al, 0x20
            //   eb57                 | inc                 esp
            //   b9a7060000           | mov                 byte ptr [edx], al

        $sequence_8 = { eb42 b9e3050000 eb3b b90b070000 eb34 2d63450000 7428 }
            // n = 7, score = 400
            //   eb42                 | xor                 ecx, ecx
            //   b9e3050000           | inc                 esp
            //   eb3b                 | lea                 ecx, dword ptr [ebx + 4]
            //   b90b070000           | dec                 eax
            //   eb34                 | mov                 edi, ecx
            //   2d63450000           | dec                 eax
            //   7428                 | mov                 esi, edx

        $sequence_9 = { 3d39380000 741c 3dd73a0000 740e 3dab3f0000 }
            // n = 5, score = 400
            //   3d39380000           | add                 esp, 0xc
            //   741c                 | lea                 eax, dword ptr [ebx + 8]
            //   3dd73a0000           | push                eax
            //   740e                 | add                 esp, 0xc
            //   3dab3f0000           | lea                 eax, dword ptr [ebp - 0x34]

    condition:
        7 of them and filesize < 106496
}
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