SYMBOLCOMMON_NAMEaka. SYNONYMS
win.webc2_cson (Back to overview)

WebC2-Cson

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_webc2_cson_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_webc2_cson_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.webc2_cson"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 8d85acfcffff 59 6a01 50 8d85acfeffff 50 }
            // n = 6, score = 100
            //   8d85acfcffff         | lea                 eax, [ebp - 0x354]
            //   59                   | pop                 ecx
            //   6a01                 | push                1
            //   50                   | push                eax
            //   8d85acfeffff         | lea                 eax, [ebp - 0x154]
            //   50                   | push                eax

        $sequence_1 = { 8d7c2419 68???????? f3ab 66ab aa }
            // n = 5, score = 100
            //   8d7c2419             | lea                 edi, [esp + 0x19]
            //   68????????           |                     
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   aa                   | stosb               byte ptr es:[edi], al

        $sequence_2 = { 8d8500fcffff 6a0a 50 ff7608 ff15???????? 8d8500fcffff }
            // n = 6, score = 100
            //   8d8500fcffff         | lea                 eax, [ebp - 0x400]
            //   6a0a                 | push                0xa
            //   50                   | push                eax
            //   ff7608               | push                dword ptr [esi + 8]
            //   ff15????????         |                     
            //   8d8500fcffff         | lea                 eax, [ebp - 0x400]

        $sequence_3 = { 53 51 ffd0 85c0 0f84a6000000 395df0 7427 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   51                   | push                ecx
            //   ffd0                 | call                eax
            //   85c0                 | test                eax, eax
            //   0f84a6000000         | je                  0xac
            //   395df0               | cmp                 dword ptr [ebp - 0x10], ebx
            //   7427                 | je                  0x29

        $sequence_4 = { bf???????? 881d???????? 57 56 e8???????? 83c414 }
            // n = 6, score = 100
            //   bf????????           |                     
            //   881d????????         |                     
            //   57                   | push                edi
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14

        $sequence_5 = { 59 8dbd41fdffff 889d40fdffff 895dfc f3ab 66ab aa }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   8dbd41fdffff         | lea                 edi, [ebp - 0x2bf]
            //   889d40fdffff         | mov                 byte ptr [ebp - 0x2c0], bl
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   aa                   | stosb               byte ptr es:[edi], al

        $sequence_6 = { 6a06 be???????? 57 56 e8???????? 53 }
            // n = 6, score = 100
            //   6a06                 | push                6
            //   be????????           |                     
            //   57                   | push                edi
            //   56                   | push                esi
            //   e8????????           |                     
            //   53                   | push                ebx

        $sequence_7 = { be00900100 6800040000 8d85ecfbffff 53 50 e8???????? }
            // n = 6, score = 100
            //   be00900100           | mov                 esi, 0x19000
            //   6800040000           | push                0x400
            //   8d85ecfbffff         | lea                 eax, [ebp - 0x414]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_8 = { 8d85acfcffff 50 e8???????? 80bc05abfcffff5c 59 7413 }
            // n = 6, score = 100
            //   8d85acfcffff         | lea                 eax, [ebp - 0x354]
            //   50                   | push                eax
            //   e8????????           |                     
            //   80bc05abfcffff5c     | cmp                 byte ptr [ebp + eax - 0x355], 0x5c
            //   59                   | pop                 ecx
            //   7413                 | je                  0x15

        $sequence_9 = { 0f85effeffff 68???????? eb2a 8d45c0 68???????? }
            // n = 5, score = 100
            //   0f85effeffff         | jne                 0xfffffef5
            //   68????????           |                     
            //   eb2a                 | jmp                 0x2c
            //   8d45c0               | lea                 eax, [ebp - 0x40]
            //   68????????           |                     

    condition:
        7 of them and filesize < 98304
}
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