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 (20201023 | autogenerated rule brought to you by yara-signator)
rule win_webc2_ugx_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_ugx"
        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 = { 6a04 50 ff750c ff55cc 83f8ff 7426 ff75f0 }
            // n = 7, score = 100
            //   6a04                 | push                4
            //   50                   | push                eax
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ff55cc               | call                dword ptr [ebp - 0x34]
            //   83f8ff               | cmp                 eax, -1
            //   7426                 | je                  0x28
            //   ff75f0               | push                dword ptr [ebp - 0x10]

        $sequence_1 = { 57 ff969c060000 3bc3 894588 }
            // n = 4, score = 100
            //   57                   | push                edi
            //   ff969c060000         | call                dword ptr [esi + 0x69c]
            //   3bc3                 | cmp                 eax, ebx
            //   894588               | mov                 dword ptr [ebp - 0x78], eax

        $sequence_2 = { ff55ec 3bc3 745d 395df8 742c 33c0 }
            // n = 6, score = 100
            //   ff55ec               | call                dword ptr [ebp - 0x14]
            //   3bc3                 | cmp                 eax, ebx
            //   745d                 | je                  0x5f
            //   395df8               | cmp                 dword ptr [ebp - 8], ebx
            //   742c                 | je                  0x2e
            //   33c0                 | xor                 eax, eax

        $sequence_3 = { 8b7508 57 8d86d4060000 50 }
            // n = 4, score = 100
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   57                   | push                edi
            //   8d86d4060000         | lea                 eax, [esi + 0x6d4]
            //   50                   | push                eax

        $sequence_4 = { 7438 8d86de0c0000 50 8d85e8feffff }
            // n = 4, score = 100
            //   7438                 | je                  0x3a
            //   8d86de0c0000         | lea                 eax, [esi + 0xcde]
            //   50                   | push                eax
            //   8d85e8feffff         | lea                 eax, [ebp - 0x118]

        $sequence_5 = { aa 33c0 8d7d9d 885d9c c645d47a ab ab }
            // n = 7, score = 100
            //   aa                   | stosb               byte ptr es:[edi], al
            //   33c0                 | xor                 eax, eax
            //   8d7d9d               | lea                 edi, [ebp - 0x63]
            //   885d9c               | mov                 byte ptr [ebp - 0x64], bl
            //   c645d47a             | mov                 byte ptr [ebp - 0x2c], 0x7a
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   ab                   | stosd               dword ptr es:[edi], eax

        $sequence_6 = { 53 53 ff55dc 83f8ff 0f841c020000 8d8510feffff 50 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   ff55dc               | call                dword ptr [ebp - 0x24]
            //   83f8ff               | cmp                 eax, -1
            //   0f841c020000         | je                  0x222
            //   8d8510feffff         | lea                 eax, [ebp - 0x1f0]
            //   50                   | push                eax

        $sequence_7 = { 895dd8 895ddc 895dc8 c745c401000000 }
            // n = 4, score = 100
            //   895dd8               | mov                 dword ptr [ebp - 0x28], ebx
            //   895ddc               | mov                 dword ptr [ebp - 0x24], ebx
            //   895dc8               | mov                 dword ptr [ebp - 0x38], ebx
            //   c745c401000000       | mov                 dword ptr [ebp - 0x3c], 1

        $sequence_8 = { aa 33c0 8d7de9 885de8 8b7508 }
            // n = 5, score = 100
            //   aa                   | stosb               byte ptr es:[edi], al
            //   33c0                 | xor                 eax, eax
            //   8d7de9               | lea                 edi, [ebp - 0x17]
            //   885de8               | mov                 byte ptr [ebp - 0x18], bl
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]

        $sequence_9 = { 57 50 ff55f0 8d856cffffff 6a10 50 89bd88feffff }
            // n = 7, score = 100
            //   57                   | push                edi
            //   50                   | push                eax
            //   ff55f0               | call                dword ptr [ebp - 0x10]
            //   8d856cffffff         | lea                 eax, [ebp - 0x94]
            //   6a10                 | push                0x10
            //   50                   | push                eax
            //   89bd88feffff         | mov                 dword ptr [ebp - 0x178], edi

    condition:
        7 of them and filesize < 57344
}
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