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 (20220411 | Detects win.webc2_cson.)
rule win_webc2_cson_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.webc2_cson."
        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.webc2_cson"
        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 = { c745f401000000 ff15???????? 85c0 7507 }
            // n = 4, score = 100
            //   c745f401000000       | mov                 dword ptr [ebp - 0xc], 1
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7507                 | jne                 9

        $sequence_1 = { 66a1???????? 56 57 6a1f 66894580 59 }
            // n = 6, score = 100
            //   66a1????????         |                     
            //   56                   | push                esi
            //   57                   | push                edi
            //   6a1f                 | push                0x1f
            //   66894580             | mov                 word ptr [ebp - 0x80], ax
            //   59                   | pop                 ecx

        $sequence_2 = { 395dfc 7637 56 8d85ec6bfeff 53 50 }
            // n = 6, score = 100
            //   395dfc               | cmp                 dword ptr [ebp - 4], ebx
            //   7637                 | jbe                 0x39
            //   56                   | push                esi
            //   8d85ec6bfeff         | lea                 eax, dword ptr [ebp - 0x19414]
            //   53                   | push                ebx
            //   50                   | push                eax

        $sequence_3 = { 8d85c0feffff 50 e8???????? 83c444 }
            // n = 4, score = 100
            //   8d85c0feffff         | lea                 eax, dword ptr [ebp - 0x140]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c444               | add                 esp, 0x44

        $sequence_4 = { 6a7f 33c0 59 8dbd41fdffff 889d40fdffff 895dfc }
            // n = 6, score = 100
            //   6a7f                 | push                0x7f
            //   33c0                 | xor                 eax, eax
            //   59                   | pop                 ecx
            //   8dbd41fdffff         | lea                 edi, dword ptr [ebp - 0x2bf]
            //   889d40fdffff         | mov                 byte ptr [ebp - 0x2c0], bl
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx

        $sequence_5 = { 8dbded6bfeff 889dec6bfeff f3ab 66ab aa 8d45ec }
            // n = 6, score = 100
            //   8dbded6bfeff         | lea                 edi, dword ptr [ebp - 0x19413]
            //   889dec6bfeff         | mov                 byte ptr [ebp - 0x19414], bl
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   aa                   | stosb               byte ptr es:[edi], al
            //   8d45ec               | lea                 eax, dword ptr [ebp - 0x14]

        $sequence_6 = { 57 e8???????? 83c438 eb9e }
            // n = 4, score = 100
            //   57                   | push                edi
            //   e8????????           |                     
            //   83c438               | add                 esp, 0x38
            //   eb9e                 | jmp                 0xffffffa0

        $sequence_7 = { 53 53 bf???????? 6a03 }
            // n = 4, score = 100
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   bf????????           |                     
            //   6a03                 | push                3

        $sequence_8 = { 0f843d010000 83e803 0f8414010000 83e803 0f84ef000000 83e805 0f8496000000 }
            // n = 7, score = 100
            //   0f843d010000         | je                  0x143
            //   83e803               | sub                 eax, 3
            //   0f8414010000         | je                  0x11a
            //   83e803               | sub                 eax, 3
            //   0f84ef000000         | je                  0xf5
            //   83e805               | sub                 eax, 5
            //   0f8496000000         | je                  0x9c

        $sequence_9 = { 68???????? b8???????? 6a03 50 50 8d45a0 53 }
            // n = 7, score = 100
            //   68????????           |                     
            //   b8????????           |                     
            //   6a03                 | push                3
            //   50                   | push                eax
            //   50                   | push                eax
            //   8d45a0               | lea                 eax, dword ptr [ebp - 0x60]
            //   53                   | push                ebx

    condition:
        7 of them and filesize < 98304
}
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