SYMBOLCOMMON_NAMEaka. SYNONYMS
win.bouncer (Back to overview)

Bouncer

Actor(s): Comment Crew


There is no description at this point.

References
2018MandiantMandiant
@techreport{mandiant:2018:apt1:b76cc4d, author = {Mandiant}, title = {{APT1}}, date = {2018}, institution = {Mandiant}, url = {https://github.com/securitykitten/malware_references/blob/master/Appendix%20C%20(Digital)%20-%20The%20Malware%20Arsenal.pdf}, language = {English}, urldate = {2020-01-13} } APT1
Auriga Biscuit Bouncer Combos CookieBag Dairy GetMail GlooxMail Goggles Hacksfase Helauto Kurton ManItsMe MAPIget MiniASP NewsReels SeaSalt StarsyPound Sword TabMsgSQL Tarsip WebC2-AdSpace WebC2-Ausov WebC2-Bolid WebC2-Cson WebC2-DIV WebC2-GreenCat WebC2-Head WebC2-Kt3 WebC2-Qbp WebC2-Rave WebC2-Table WebC2-UGX WebC2-Yahoo
Yara Rules
[TLP:WHITE] win_bouncer_auto (20230125 | Detects win.bouncer.)
rule win_bouncer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.bouncer."
        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.bouncer"
        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 = { 895d14 7412 81fb12030900 740a 3bde }
            // n = 5, score = 200
            //   895d14               | mov                 dword ptr [ebp + 0x14], ebx
            //   7412                 | je                  0x14
            //   81fb12030900         | cmp                 ebx, 0x90312
            //   740a                 | je                  0xc
            //   3bde                 | cmp                 ebx, esi

        $sequence_1 = { e9???????? 68???????? ff750c e8???????? 03450c 59 50 }
            // n = 7, score = 200
            //   e9????????           |                     
            //   68????????           |                     
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   e8????????           |                     
            //   03450c               | add                 eax, dword ptr [ebp + 0xc]
            //   59                   | pop                 ecx
            //   50                   | push                eax

        $sequence_2 = { ff15???????? 83c40c 68???????? 68???????? 8935???????? ffd7 }
            // n = 6, score = 200
            //   ff15????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   68????????           |                     
            //   68????????           |                     
            //   8935????????         |                     
            //   ffd7                 | call                edi

        $sequence_3 = { c645c82e 50 e8???????? 8945dc 8d45c8 }
            // n = 5, score = 200
            //   c645c82e             | mov                 byte ptr [ebp - 0x38], 0x2e
            //   50                   | push                eax
            //   e8????????           |                     
            //   8945dc               | mov                 dword ptr [ebp - 0x24], eax
            //   8d45c8               | lea                 eax, [ebp - 0x38]

        $sequence_4 = { 750e 837d0c00 68???????? e9???????? 837d0c00 e9???????? 55 }
            // n = 7, score = 200
            //   750e                 | jne                 0x10
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   68????????           |                     
            //   e9????????           |                     
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   e9????????           |                     
            //   55                   | push                ebp

        $sequence_5 = { 8b45d8 8d701c 56 ff15???????? 8bd8 8d45dc }
            // n = 6, score = 200
            //   8b45d8               | mov                 eax, dword ptr [ebp - 0x28]
            //   8d701c               | lea                 esi, [eax + 0x1c]
            //   56                   | push                esi
            //   ff15????????         |                     
            //   8bd8                 | mov                 ebx, eax
            //   8d45dc               | lea                 eax, [ebp - 0x24]

        $sequence_6 = { 8b45f0 3bc3 8945f8 0f8515010000 }
            // n = 4, score = 200
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   3bc3                 | cmp                 eax, ebx
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   0f8515010000         | jne                 0x11b

        $sequence_7 = { 50 e8???????? 8d85a0fbffff 50 e8???????? 8bf8 83c71c }
            // n = 7, score = 200
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d85a0fbffff         | lea                 eax, [ebp - 0x460]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax
            //   83c71c               | add                 edi, 0x1c

        $sequence_8 = { 8b45e0 8945b0 8b45e4 8945c8 }
            // n = 4, score = 200
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]
            //   8945b0               | mov                 dword ptr [ebp - 0x50], eax
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   8945c8               | mov                 dword ptr [ebp - 0x38], eax

        $sequence_9 = { 48 7417 48 752f }
            // n = 4, score = 200
            //   48                   | dec                 eax
            //   7417                 | je                  0x19
            //   48                   | dec                 eax
            //   752f                 | jne                 0x31

    condition:
        7 of them and filesize < 335872
}
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