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 (20230125 | Detects win.webc2_greencat.)
rule win_webc2_greencat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { ff75e8 ffd3 ff75ec ffd3 eb27 ff15???????? 50 }
            // n = 7, score = 100
            //   ff75e8               | push                dword ptr [ebp - 0x18]
            //   ffd3                 | call                ebx
            //   ff75ec               | push                dword ptr [ebp - 0x14]
            //   ffd3                 | call                ebx
            //   eb27                 | jmp                 0x29
            //   ff15????????         |                     
            //   50                   | push                eax

        $sequence_1 = { 85c0 741b 68???????? ff7508 e8???????? 59 }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   741b                 | je                  0x1d
            //   68????????           |                     
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_2 = { 8d4dfc 51 6800100000 53 50 }
            // n = 5, score = 100
            //   8d4dfc               | lea                 ecx, [ebp - 4]
            //   51                   | push                ecx
            //   6800100000           | push                0x1000
            //   53                   | push                ebx
            //   50                   | push                eax

        $sequence_3 = { 53 ff15???????? 55 e8???????? 3bf3 59 7407 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   55                   | push                ebp
            //   e8????????           |                     
            //   3bf3                 | cmp                 esi, ebx
            //   59                   | pop                 ecx
            //   7407                 | je                  9

        $sequence_4 = { 59 0f85ab000000 bf28010000 8d85c0fdffff }
            // n = 4, score = 100
            //   59                   | pop                 ecx
            //   0f85ab000000         | jne                 0xb1
            //   bf28010000           | mov                 edi, 0x128
            //   8d85c0fdffff         | lea                 eax, [ebp - 0x240]

        $sequence_5 = { 397dec 750f 8d8578ffffff 8d4db8 50 e8???????? }
            // n = 6, score = 100
            //   397dec               | cmp                 dword ptr [ebp - 0x14], edi
            //   750f                 | jne                 0x11
            //   8d8578ffffff         | lea                 eax, [ebp - 0x88]
            //   8d4db8               | lea                 ecx, [ebp - 0x48]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_6 = { 56 57 53 ff15???????? 57 68???????? ff75fc }
            // n = 7, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   57                   | push                edi
            //   68????????           |                     
            //   ff75fc               | push                dword ptr [ebp - 4]

        $sequence_7 = { 50 0fb745e4 50 8d8710020000 ffb550ffffff ffb54cffffff 68???????? }
            // n = 7, score = 100
            //   50                   | push                eax
            //   0fb745e4             | movzx               eax, word ptr [ebp - 0x1c]
            //   50                   | push                eax
            //   8d8710020000         | lea                 eax, [edi + 0x210]
            //   ffb550ffffff         | push                dword ptr [ebp - 0xb0]
            //   ffb54cffffff         | push                dword ptr [ebp - 0xb4]
            //   68????????           |                     

        $sequence_8 = { 881c38 ff15???????? ff75fc 57 e8???????? be???????? 8d4588 }
            // n = 7, score = 100
            //   881c38               | mov                 byte ptr [eax + edi], bl
            //   ff15????????         |                     
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   57                   | push                edi
            //   e8????????           |                     
            //   be????????           |                     
            //   8d4588               | lea                 eax, [ebp - 0x78]

        $sequence_9 = { 80f90a 7405 46 3bf0 72ea 803c3e0d }
            // n = 6, score = 100
            //   80f90a               | cmp                 cl, 0xa
            //   7405                 | je                  7
            //   46                   | inc                 esi
            //   3bf0                 | cmp                 esi, eax
            //   72ea                 | jb                  0xffffffec
            //   803c3e0d             | cmp                 byte ptr [esi + edi], 0xd

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