SYMBOLCOMMON_NAMEaka. SYNONYMS
win.webc2_ugx (Back to overview)

WebC2-UGX

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_ugx_auto (20220411 | Detects win.webc2_ugx.)
rule win_webc2_ugx_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.webc2_ugx."
        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_ugx"
        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 = { 8d85e0fbffff 50 ff55e8 8d8568ffffff }
            // n = 4, score = 100
            //   8d85e0fbffff         | lea                 eax, dword ptr [ebp - 0x420]
            //   50                   | push                eax
            //   ff55e8               | call                dword ptr [ebp - 0x18]
            //   8d8568ffffff         | lea                 eax, dword ptr [ebp - 0x98]

        $sequence_1 = { ff55ac 53 53 8d85e4fdffff 53 50 }
            // n = 6, score = 100
            //   ff55ac               | call                dword ptr [ebp - 0x54]
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8d85e4fdffff         | lea                 eax, dword ptr [ebp - 0x21c]
            //   53                   | push                ebx
            //   50                   | push                eax

        $sequence_2 = { 0f84d3000000 6800100000 6a40 ff5594 8bf8 }
            // n = 5, score = 100
            //   0f84d3000000         | je                  0xd9
            //   6800100000           | push                0x1000
            //   6a40                 | push                0x40
            //   ff5594               | call                dword ptr [ebp - 0x6c]
            //   8bf8                 | mov                 edi, eax

        $sequence_3 = { 8d8678030000 50 ff55b0 83c410 8d8568ffffff 66c7857cffffff0200 50 }
            // n = 7, score = 100
            //   8d8678030000         | lea                 eax, dword ptr [esi + 0x378]
            //   50                   | push                eax
            //   ff55b0               | call                dword ptr [ebp - 0x50]
            //   83c410               | add                 esp, 0x10
            //   8d8568ffffff         | lea                 eax, dword ptr [ebp - 0x98]
            //   66c7857cffffff0200     | mov    word ptr [ebp - 0x84], 2
            //   50                   | push                eax

        $sequence_4 = { 50 53 53 ff55cc e9???????? 8d85ccfeffff }
            // n = 6, score = 100
            //   50                   | push                eax
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   ff55cc               | call                dword ptr [ebp - 0x34]
            //   e9????????           |                     
            //   8d85ccfeffff         | lea                 eax, dword ptr [ebp - 0x134]

        $sequence_5 = { 6a01 58 8a8c0584f9ffff 3acb 740c 888c0583fcffff 40 }
            // n = 7, score = 100
            //   6a01                 | push                1
            //   58                   | pop                 eax
            //   8a8c0584f9ffff       | mov                 cl, byte ptr [ebp + eax - 0x67c]
            //   3acb                 | cmp                 cl, bl
            //   740c                 | je                  0xe
            //   888c0583fcffff       | mov                 byte ptr [ebp + eax - 0x37d], cl
            //   40                   | inc                 eax

        $sequence_6 = { 6a10 50 57 ff55a8 83f8ff }
            // n = 5, score = 100
            //   6a10                 | push                0x10
            //   50                   | push                eax
            //   57                   | push                edi
            //   ff55a8               | call                dword ptr [ebp - 0x58]
            //   83f8ff               | cmp                 eax, -1

        $sequence_7 = { 85c0 745d 8d45e4 50 57 68???????? ff75bc }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   745d                 | je                  0x5f
            //   8d45e4               | lea                 eax, dword ptr [ebp - 0x1c]
            //   50                   | push                eax
            //   57                   | push                edi
            //   68????????           |                     
            //   ff75bc               | push                dword ptr [ebp - 0x44]

        $sequence_8 = { ff75b4 ff16 ff75ec ff16 5f 5e 5b }
            // n = 7, score = 100
            //   ff75b4               | push                dword ptr [ebp - 0x4c]
            //   ff16                 | call                dword ptr [esi]
            //   ff75ec               | push                dword ptr [ebp - 0x14]
            //   ff16                 | call                dword ptr [esi]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_9 = { 57 6a40 33c0 59 8dbdf5feffff }
            // n = 5, score = 100
            //   57                   | push                edi
            //   6a40                 | push                0x40
            //   33c0                 | xor                 eax, eax
            //   59                   | pop                 ecx
            //   8dbdf5feffff         | lea                 edi, dword ptr [ebp - 0x10b]

    condition:
        7 of them and filesize < 57344
}
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