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 (20230125 | Detects win.webc2_ausov.)
rule win_webc2_ausov_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.webc2_ausov."
        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_ausov"
        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 = { 0fbe4801 334dfc 8b5508 0355f8 }
            // n = 4, score = 100
            //   0fbe4801             | movsx               ecx, byte ptr [eax + 1]
            //   334dfc               | xor                 ecx, dword ptr [ebp - 4]
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   0355f8               | add                 edx, dword ptr [ebp - 8]

        $sequence_1 = { 52 e8???????? 83c408 50 8b85f8fbffff 50 e8???????? }
            // n = 7, score = 100
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   50                   | push                eax
            //   8b85f8fbffff         | mov                 eax, dword ptr [ebp - 0x408]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_2 = { 83bdc4fdffff00 7507 33c0 e9???????? bf???????? 8d95a8faffff 83c9ff }
            // n = 7, score = 100
            //   83bdc4fdffff00       | cmp                 dword ptr [ebp - 0x23c], 0
            //   7507                 | jne                 9
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     
            //   bf????????           |                     
            //   8d95a8faffff         | lea                 edx, [ebp - 0x558]
            //   83c9ff               | or                  ecx, 0xffffffff

        $sequence_3 = { f7d1 83c1ff 8b95f8fbffff 03d1 52 e8???????? }
            // n = 6, score = 100
            //   f7d1                 | not                 ecx
            //   83c1ff               | add                 ecx, -1
            //   8b95f8fbffff         | mov                 edx, dword ptr [ebp - 0x408]
            //   03d1                 | add                 edx, ecx
            //   52                   | push                edx
            //   e8????????           |                     

        $sequence_4 = { ff15???????? bf???????? 8d95a8faffff 83c9ff 33c0 }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   bf????????           |                     
            //   8d95a8faffff         | lea                 edx, [ebp - 0x558]
            //   83c9ff               | or                  ecx, 0xffffffff
            //   33c0                 | xor                 eax, eax

        $sequence_5 = { 83bdc4fdffff00 7507 33c0 e9???????? bf???????? 8d95a8faffff }
            // n = 6, score = 100
            //   83bdc4fdffff00       | cmp                 dword ptr [ebp - 0x23c], 0
            //   7507                 | jne                 9
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     
            //   bf????????           |                     
            //   8d95a8faffff         | lea                 edx, [ebp - 0x558]

        $sequence_6 = { 52 8d45fc 50 6a00 683f000f00 6a00 6a00 }
            // n = 7, score = 100
            //   52                   | push                edx
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   6a00                 | push                0
            //   683f000f00           | push                0xf003f
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_7 = { f8 68???????? 8d8dfcfbffff 51 e8???????? 83c408 0f8407000000 }
            // n = 7, score = 100
            //   f8                   | clc                 
            //   68????????           |                     
            //   8d8dfcfbffff         | lea                 ecx, [ebp - 0x404]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   0f8407000000         | je                  0xd

        $sequence_8 = { 6a00 6a00 6a00 68???????? 8d85f8fbffff 50 }
            // n = 6, score = 100
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   68????????           |                     
            //   8d85f8fbffff         | lea                 eax, [ebp - 0x408]
            //   50                   | push                eax

        $sequence_9 = { 33c0 f2ae f7d1 83c1ff 8b95f8fbffff 03d1 }
            // n = 6, score = 100
            //   33c0                 | xor                 eax, eax
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   83c1ff               | add                 ecx, -1
            //   8b95f8fbffff         | mov                 edx, dword ptr [ebp - 0x408]
            //   03d1                 | add                 edx, ecx

    condition:
        7 of them and filesize < 40960
}
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