SYMBOLCOMMON_NAMEaka. SYNONYMS
win.webc2_kt3 (Back to overview)

WebC2-Kt3

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_kt3_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_webc2_kt3_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_kt3"
        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 = { 52 8b45e8 50 8b4df0 51 8b55f4 52 }
            // n = 7, score = 100
            //   52                   | push                edx
            //   8b45e8               | mov                 eax, dword ptr [ebp - 0x18]
            //   50                   | push                eax
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   51                   | push                ecx
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]
            //   52                   | push                edx

        $sequence_1 = { 8b95a4feffff 2b95a0feffff 52 8b85a0feffff 83c001 50 8d8decfeffff }
            // n = 7, score = 100
            //   8b95a4feffff         | mov                 edx, dword ptr [ebp - 0x15c]
            //   2b95a0feffff         | sub                 edx, dword ptr [ebp - 0x160]
            //   52                   | push                edx
            //   8b85a0feffff         | mov                 eax, dword ptr [ebp - 0x160]
            //   83c001               | add                 eax, 1
            //   50                   | push                eax
            //   8d8decfeffff         | lea                 ecx, [ebp - 0x114]

        $sequence_2 = { c705????????ac3a4000 a3???????? c3 8b4c240c 57 85c9 }
            // n = 6, score = 100
            //   c705????????ac3a4000     |     
            //   a3????????           |                     
            //   c3                   | ret                 
            //   8b4c240c             | mov                 ecx, dword ptr [esp + 0xc]
            //   57                   | push                edi
            //   85c9                 | test                ecx, ecx

        $sequence_3 = { 51 e8???????? 83c404 eb07 33c0 e9???????? }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   eb07                 | jmp                 9
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     

        $sequence_4 = { 0fbe11 83fa64 7536 8b4508 c70002000000 }
            // n = 5, score = 100
            //   0fbe11               | movsx               edx, byte ptr [ecx]
            //   83fa64               | cmp                 edx, 0x64
            //   7536                 | jne                 0x38
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   c70002000000         | mov                 dword ptr [eax], 2

        $sequence_5 = { 7527 8b55fc 0fbe4202 83f82d }
            // n = 4, score = 100
            //   7527                 | jne                 0x29
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   0fbe4202             | movsx               eax, byte ptr [edx + 2]
            //   83f82d               | cmp                 eax, 0x2d

        $sequence_6 = { 5b 7403 80cc10 c3 55 8bec 8b5510 }
            // n = 7, score = 100
            //   5b                   | pop                 ebx
            //   7403                 | je                  5
            //   80cc10               | or                  ah, 0x10
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   8b5510               | mov                 edx, dword ptr [ebp + 0x10]

        $sequence_7 = { 50 8b8de8fbffff 8b510c 52 e8???????? 8985e4fbffff 83bde4fbffffff }
            // n = 7, score = 100
            //   50                   | push                eax
            //   8b8de8fbffff         | mov                 ecx, dword ptr [ebp - 0x418]
            //   8b510c               | mov                 edx, dword ptr [ecx + 0xc]
            //   52                   | push                edx
            //   e8????????           |                     
            //   8985e4fbffff         | mov                 dword ptr [ebp - 0x41c], eax
            //   83bde4fbffffff       | cmp                 dword ptr [ebp - 0x41c], -1

        $sequence_8 = { 837a0400 740d 8b45e8 8b4804 51 ff15???????? 0f8207000000 }
            // n = 7, score = 100
            //   837a0400             | cmp                 dword ptr [edx + 4], 0
            //   740d                 | je                  0xf
            //   8b45e8               | mov                 eax, dword ptr [ebp - 0x18]
            //   8b4804               | mov                 ecx, dword ptr [eax + 4]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   0f8207000000         | jb                  0xd

        $sequence_9 = { 68???????? 50 e8???????? ffb6fcc74000 8d8560ffffff 50 }
            // n = 6, score = 100
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   ffb6fcc74000         | push                dword ptr [esi + 0x40c7fc]
            //   8d8560ffffff         | lea                 eax, [ebp - 0xa0]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 114688
}
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