SYMBOLCOMMON_NAMEaka. SYNONYMS
win.webc2_greencat (Back to overview)

WebC2-GreenCat

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_greencat_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_webc2_greencat_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_greencat"
        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 = { 50 ff15???????? 8bf0 83c410 f7de 1bf6 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   83c410               | add                 esp, 0x10
            //   f7de                 | neg                 esi
            //   1bf6                 | sbb                 esi, esi

        $sequence_1 = { 59 7437 40 50 56 e8???????? 6a2e }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   7437                 | je                  0x39
            //   40                   | inc                 eax
            //   50                   | push                eax
            //   56                   | push                esi
            //   e8????????           |                     
            //   6a2e                 | push                0x2e

        $sequence_2 = { 8d859cfbffff 56 53 50 e8???????? 83c418 53 }
            // n = 7, score = 100
            //   8d859cfbffff         | lea                 eax, [ebp - 0x464]
            //   56                   | push                esi
            //   53                   | push                ebx
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18
            //   53                   | push                ebx

        $sequence_3 = { 6a04 53 53 ff15???????? 8bf8 3bfb 7507 }
            // n = 7, score = 100
            //   6a04                 | push                4
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax
            //   3bfb                 | cmp                 edi, ebx
            //   7507                 | jne                 9

        $sequence_4 = { 68000000a0 6aff 50 ff760c eb83 8b45f8 5f }
            // n = 7, score = 100
            //   68000000a0           | push                0xa0000000
            //   6aff                 | push                -1
            //   50                   | push                eax
            //   ff760c               | push                dword ptr [esi + 0xc]
            //   eb83                 | jmp                 0xffffff85
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   5f                   | pop                 edi

        $sequence_5 = { 59 8d8598feffff 59 50 ff15???????? 56 68???????? }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   8d8598feffff         | lea                 eax, [ebp - 0x168]
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   ff15????????         |                     
            //   56                   | push                esi
            //   68????????           |                     

        $sequence_6 = { 83c414 03f0 8d45ec c745ec10000000 50 56 ff15???????? }
            // n = 7, score = 100
            //   83c414               | add                 esp, 0x14
            //   03f0                 | add                 esi, eax
            //   8d45ec               | lea                 eax, [ebp - 0x14]
            //   c745ec10000000       | mov                 dword ptr [ebp - 0x14], 0x10
            //   50                   | push                eax
            //   56                   | push                esi
            //   ff15????????         |                     

        $sequence_7 = { 7506 80243e00 46 46 8d043e }
            // n = 5, score = 100
            //   7506                 | jne                 8
            //   80243e00             | and                 byte ptr [esi + edi], 0
            //   46                   | inc                 esi
            //   46                   | inc                 esi
            //   8d043e               | lea                 eax, [esi + edi]

        $sequence_8 = { ffd6 8b45e8 8d7801 57 e8???????? 3bc3 59 }
            // n = 7, score = 100
            //   ffd6                 | call                esi
            //   8b45e8               | mov                 eax, dword ptr [ebp - 0x18]
            //   8d7801               | lea                 edi, [eax + 1]
            //   57                   | push                edi
            //   e8????????           |                     
            //   3bc3                 | cmp                 eax, ebx
            //   59                   | pop                 ecx

        $sequence_9 = { 53 53 53 53 8d85e0fdffff 6805010000 50 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8d85e0fdffff         | lea                 eax, [ebp - 0x220]
            //   6805010000           | push                0x105
            //   50                   | push                eax

    condition:
        7 of them and filesize < 57344
}
Download all Yara Rules