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 (20220411 | Detects win.bouncer.)
rule win_bouncer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        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 = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 59 8bf3 894510 6a00 f3a5 ff7308 ff7510 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   8bf3                 | mov                 esi, ebx
            //   894510               | mov                 dword ptr [ebp + 0x10], eax
            //   6a00                 | push                0
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   ff7308               | push                dword ptr [ebx + 8]
            //   ff7510               | push                dword ptr [ebp + 0x10]

        $sequence_1 = { e8???????? 8d85a4faffff c645c82e 50 e8???????? }
            // n = 5, score = 100
            //   e8????????           |                     
            //   8d85a4faffff         | lea                 eax, dword ptr [ebp - 0x55c]
            //   c645c82e             | mov                 byte ptr [ebp - 0x38], 0x2e
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_2 = { e8???????? ff75f8 6a01 e8???????? 8bc6 5e }
            // n = 6, score = 100
            //   e8????????           |                     
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   6a01                 | push                1
            //   e8????????           |                     
            //   8bc6                 | mov                 eax, esi
            //   5e                   | pop                 esi

        $sequence_3 = { c3 8b542404 51 51 50 68???????? 51 }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   8b542404             | mov                 edx, dword ptr [esp + 4]
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   50                   | push                eax
            //   68????????           |                     
            //   51                   | push                ecx

        $sequence_4 = { eb03 8b45fc 40 50 ff15???????? 8bf8 }
            // n = 6, score = 100
            //   eb03                 | jmp                 5
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   40                   | inc                 eax
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax

        $sequence_5 = { 56 e8???????? 8d85a4faffff 50 e8???????? 50 8d85a4faffff }
            // n = 7, score = 100
            //   56                   | push                esi
            //   e8????????           |                     
            //   8d85a4faffff         | lea                 eax, dword ptr [ebp - 0x55c]
            //   50                   | push                eax
            //   e8????????           |                     
            //   50                   | push                eax
            //   8d85a4faffff         | lea                 eax, dword ptr [ebp - 0x55c]

        $sequence_6 = { ff35???????? ebea e8???????? 59 5f 5e 5b }
            // n = 7, score = 100
            //   ff35????????         |                     
            //   ebea                 | jmp                 0xffffffec
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_7 = { 7434 8d45ec 6a00 50 8d4604 50 8d45fc }
            // n = 7, score = 100
            //   7434                 | je                  0x36
            //   8d45ec               | lea                 eax, dword ptr [ebp - 0x14]
            //   6a00                 | push                0
            //   50                   | push                eax
            //   8d4604               | lea                 eax, dword ptr [esi + 4]
            //   50                   | push                eax
            //   8d45fc               | lea                 eax, dword ptr [ebp - 4]

        $sequence_8 = { ff15???????? 807d1054 8945f0 7504 53 56 }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   807d1054             | cmp                 byte ptr [ebp + 0x10], 0x54
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   7504                 | jne                 6
            //   53                   | push                ebx
            //   56                   | push                esi

        $sequence_9 = { 897db0 8975c4 ff750c 8975bc 8975c0 }
            // n = 5, score = 100
            //   897db0               | mov                 dword ptr [ebp - 0x50], edi
            //   8975c4               | mov                 dword ptr [ebp - 0x3c], esi
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   8975bc               | mov                 dword ptr [ebp - 0x44], esi
            //   8975c0               | mov                 dword ptr [ebp - 0x40], esi

    condition:
        7 of them and filesize < 335872
}
Download all Yara Rules