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 (20220411 | Detects win.webc2_greencat.)
rule win_webc2_greencat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.webc2_greencat."
        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_greencat"
        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 = { 895da4 ff15???????? 85c0 0f842e030000 8d8598feffff 6804010000 }
            // n = 6, score = 100
            //   895da4               | mov                 dword ptr [ebp - 0x5c], ebx
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f842e030000         | je                  0x334
            //   8d8598feffff         | lea                 eax, dword ptr [ebp - 0x168]
            //   6804010000           | push                0x104

        $sequence_1 = { e8???????? 83c40c be???????? ff35???????? 56 ff15???????? }
            // n = 6, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   be????????           |                     
            //   ff35????????         |                     
            //   56                   | push                esi
            //   ff15????????         |                     

        $sequence_2 = { 8d4307 eb0a c745fc01000000 8d4308 50 57 }
            // n = 6, score = 100
            //   8d4307               | lea                 eax, dword ptr [ebx + 7]
            //   eb0a                 | jmp                 0xc
            //   c745fc01000000       | mov                 dword ptr [ebp - 4], 1
            //   8d4308               | lea                 eax, dword ptr [ebx + 8]
            //   50                   | push                eax
            //   57                   | push                edi

        $sequence_3 = { 57 56 8d8594feffff 56 }
            // n = 4, score = 100
            //   57                   | push                edi
            //   56                   | push                esi
            //   8d8594feffff         | lea                 eax, dword ptr [ebp - 0x16c]
            //   56                   | push                esi

        $sequence_4 = { 68???????? 53 e8???????? 8d8594feffff 50 }
            // n = 5, score = 100
            //   68????????           |                     
            //   53                   | push                ebx
            //   e8????????           |                     
            //   8d8594feffff         | lea                 eax, dword ptr [ebp - 0x16c]
            //   50                   | push                eax

        $sequence_5 = { 83f839 7ef6 8d45bc 68???????? 50 e8???????? }
            // n = 6, score = 100
            //   83f839               | cmp                 eax, 0x39
            //   7ef6                 | jle                 0xfffffff8
            //   8d45bc               | lea                 eax, dword ptr [ebp - 0x44]
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_6 = { 57 e8???????? 83c40c 68???????? 6a01 53 ff15???????? }
            // n = 7, score = 100
            //   57                   | push                edi
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   68????????           |                     
            //   6a01                 | push                1
            //   53                   | push                ebx
            //   ff15????????         |                     

        $sequence_7 = { 8b75d4 56 e8???????? 56 }
            // n = 4, score = 100
            //   8b75d4               | mov                 esi, dword ptr [ebp - 0x2c]
            //   56                   | push                esi
            //   e8????????           |                     
            //   56                   | push                esi

        $sequence_8 = { ff15???????? 83f8ff 8945ec 7411 ff15???????? 3db7000000 0f84de010000 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   83f8ff               | cmp                 eax, -1
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   7411                 | je                  0x13
            //   ff15????????         |                     
            //   3db7000000           | cmp                 eax, 0xb7
            //   0f84de010000         | je                  0x1e4

        $sequence_9 = { 53 6800000040 eb0f 57 6880000000 6a03 }
            // n = 6, score = 100
            //   53                   | push                ebx
            //   6800000040           | push                0x40000000
            //   eb0f                 | jmp                 0x11
            //   57                   | push                edi
            //   6880000000           | push                0x80
            //   6a03                 | push                3

    condition:
        7 of them and filesize < 57344
}
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