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 (20230125 | Detects win.webc2_ugx.)
rule win_webc2_ugx_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "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 = { 50 8d8568ffffff 50 8d4648 50 8d8678030000 50 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   8d8568ffffff         | lea                 eax, [ebp - 0x98]
            //   50                   | push                eax
            //   8d4648               | lea                 eax, [esi + 0x48]
            //   50                   | push                eax
            //   8d8678030000         | lea                 eax, [esi + 0x378]
            //   50                   | push                eax

        $sequence_1 = { 57 ff969c060000 3bc3 894598 }
            // n = 4, score = 100
            //   57                   | push                edi
            //   ff969c060000         | call                dword ptr [esi + 0x69c]
            //   3bc3                 | cmp                 eax, ebx
            //   894598               | mov                 dword ptr [ebp - 0x68], eax

        $sequence_2 = { 57 ff7508 ff969c060000 3bc3 894584 0f84d8040000 8d86be090000 }
            // n = 7, score = 100
            //   57                   | push                edi
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff969c060000         | call                dword ptr [esi + 0x69c]
            //   3bc3                 | cmp                 eax, ebx
            //   894584               | mov                 dword ptr [ebp - 0x7c], eax
            //   0f84d8040000         | je                  0x4de
            //   8d86be090000         | lea                 eax, [esi + 0x9be]

        $sequence_3 = { 895db4 ff9698060000 3bc3 894508 }
            // n = 4, score = 100
            //   895db4               | mov                 dword ptr [ebp - 0x4c], ebx
            //   ff9698060000         | call                dword ptr [esi + 0x698]
            //   3bc3                 | cmp                 eax, ebx
            //   894508               | mov                 dword ptr [ebp + 8], eax

        $sequence_4 = { 8d86f8010000 50 8d8584fdffff 50 ff55ec 8d8584fdffff }
            // n = 6, score = 100
            //   8d86f8010000         | lea                 eax, [esi + 0x1f8]
            //   50                   | push                eax
            //   8d8584fdffff         | lea                 eax, [ebp - 0x27c]
            //   50                   | push                eax
            //   ff55ec               | call                dword ptr [ebp - 0x14]
            //   8d8584fdffff         | lea                 eax, [ebp - 0x27c]

        $sequence_5 = { 5d c20c00 8bc1 832000 83600400 c3 83790400 }
            // n = 7, score = 100
            //   5d                   | pop                 ebp
            //   c20c00               | ret                 0xc
            //   8bc1                 | mov                 eax, ecx
            //   832000               | and                 dword ptr [eax], 0
            //   83600400             | and                 dword ptr [eax + 4], 0
            //   c3                   | ret                 
            //   83790400             | cmp                 dword ptr [ecx + 4], 0

        $sequence_6 = { ff7508 ff969c060000 3bc3 8945b0 0f84eb030000 8d863e0c0000 50 }
            // n = 7, score = 100
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff969c060000         | call                dword ptr [esi + 0x69c]
            //   3bc3                 | cmp                 eax, ebx
            //   8945b0               | mov                 dword ptr [ebp - 0x50], eax
            //   0f84eb030000         | je                  0x3f1
            //   8d863e0c0000         | lea                 eax, [esi + 0xc3e]
            //   50                   | push                eax

        $sequence_7 = { 56 57 33db 895dfc bf???????? 897ddc }
            // n = 6, score = 100
            //   56                   | push                esi
            //   57                   | push                edi
            //   33db                 | xor                 ebx, ebx
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   bf????????           |                     
            //   897ddc               | mov                 dword ptr [ebp - 0x24], edi

        $sequence_8 = { 53 56 ff55f4 ff75fc ff5508 ff75f8 ff5508 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   56                   | push                esi
            //   ff55f4               | call                dword ptr [ebp - 0xc]
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff5508               | call                dword ptr [ebp + 8]
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   ff5508               | call                dword ptr [ebp + 8]

        $sequence_9 = { 68???????? 8d4df8 e8???????? 8d4df8 e8???????? 68???????? }
            // n = 6, score = 100
            //   68????????           |                     
            //   8d4df8               | lea                 ecx, [ebp - 8]
            //   e8????????           |                     
            //   8d4df8               | lea                 ecx, [ebp - 8]
            //   e8????????           |                     
            //   68????????           |                     

    condition:
        7 of them and filesize < 57344
}
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