SYMBOLCOMMON_NAMEaka. SYNONYMS
win.webc2_ausov (Back to overview)

WebC2-Ausov

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_ausov_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_webc2_ausov_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_ausov"
        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 = { 33c0 e9???????? bf???????? 8d95a8faffff 83c9ff 33c0 }
            // n = 6, score = 100
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     
            //   bf????????           |                     
            //   8d95a8faffff         | lea                 edx, [ebp - 0x558]
            //   83c9ff               | or                  ecx, 0xffffffff
            //   33c0                 | xor                 eax, eax

        $sequence_1 = { 0f8501000000 f8 68???????? 8d8dfcfbffff 51 e8???????? 83c408 }
            // n = 7, score = 100
            //   0f8501000000         | jne                 7
            //   f8                   | clc                 
            //   68????????           |                     
            //   8d8dfcfbffff         | lea                 ecx, [ebp - 0x404]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8

        $sequence_2 = { 8dbdf9feffff f3ab 66ab aa 0f8407000000 }
            // n = 5, score = 100
            //   8dbdf9feffff         | lea                 edi, [ebp - 0x107]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   aa                   | stosb               byte ptr es:[edi], al
            //   0f8407000000         | je                  0xd

        $sequence_3 = { e9???????? bf???????? 8d95a8faffff 83c9ff 33c0 }
            // n = 5, score = 100
            //   e9????????           |                     
            //   bf????????           |                     
            //   8d95a8faffff         | lea                 edx, [ebp - 0x558]
            //   83c9ff               | or                  ecx, 0xffffffff
            //   33c0                 | xor                 eax, eax

        $sequence_4 = { 894df8 8b55f8 3b55f4 7d31 }
            // n = 4, score = 100
            //   894df8               | mov                 dword ptr [ebp - 8], ecx
            //   8b55f8               | mov                 edx, dword ptr [ebp - 8]
            //   3b55f4               | cmp                 edx, dword ptr [ebp - 0xc]
            //   7d31                 | jge                 0x33

        $sequence_5 = { 7523 838548faffff02 83854cfaffff02 80bd46faffff00 }
            // n = 4, score = 100
            //   7523                 | jne                 0x25
            //   838548faffff02       | add                 dword ptr [ebp - 0x5b8], 2
            //   83854cfaffff02       | add                 dword ptr [ebp - 0x5b4], 2
            //   80bd46faffff00       | cmp                 byte ptr [ebp - 0x5ba], 0

        $sequence_6 = { f2ae f7d1 83c1ff 51 8d95f8feffff 52 }
            // n = 6, score = 100
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   83c1ff               | add                 ecx, -1
            //   51                   | push                ecx
            //   8d95f8feffff         | lea                 edx, [ebp - 0x108]
            //   52                   | push                edx

        $sequence_7 = { 8b85f8fbffff 50 e8???????? 83c408 8985f4fbffff 0f8407000000 }
            // n = 6, score = 100
            //   8b85f8fbffff         | mov                 eax, dword ptr [ebp - 0x408]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8985f4fbffff         | mov                 dword ptr [ebp - 0x40c], eax
            //   0f8407000000         | je                  0xd

        $sequence_8 = { 50 68???????? ff15???????? 8985c4fdffff 83bdc4fdffff00 7507 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   68????????           |                     
            //   ff15????????         |                     
            //   8985c4fdffff         | mov                 dword ptr [ebp - 0x23c], eax
            //   83bdc4fdffff00       | cmp                 dword ptr [ebp - 0x23c], 0
            //   7507                 | jne                 9

        $sequence_9 = { ffd3 85c0 7442 68???????? 50 }
            // n = 5, score = 100
            //   ffd3                 | call                ebx
            //   85c0                 | test                eax, eax
            //   7442                 | je                  0x44
            //   68????????           |                     
            //   50                   | push                eax

    condition:
        7 of them and filesize < 40960
}
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