SYMBOLCOMMON_NAMEaka. SYNONYMS
win.webc2_yahoo (Back to overview)

WebC2-Yahoo

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_yahoo_auto (20220411 | Detects win.webc2_yahoo.)
rule win_webc2_yahoo_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.webc2_yahoo."
        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_yahoo"
        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 = { 50 e8???????? 6801280000 8d85d8d7ffff 6a00 }
            // n = 5, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   6801280000           | push                0x2801
            //   8d85d8d7ffff         | lea                 eax, dword ptr [ebp - 0x2828]
            //   6a00                 | push                0

        $sequence_1 = { 6a64 e8???????? c70424???????? ff7508 }
            // n = 4, score = 100
            //   6a64                 | push                0x64
            //   e8????????           |                     
            //   c70424????????       |                     
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_2 = { 50 ff7510 ff15???????? 57 e8???????? 83c418 56 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   ff15????????         |                     
            //   57                   | push                edi
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18
            //   56                   | push                esi

        $sequence_3 = { 53 0f8497feffff e8???????? 59 8d45fc }
            // n = 5, score = 100
            //   53                   | push                ebx
            //   0f8497feffff         | je                  0xfffffe9d
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8d45fc               | lea                 eax, dword ptr [ebp - 4]

        $sequence_4 = { 68???????? c705????????01000000 80660100 57 8806 }
            // n = 5, score = 100
            //   68????????           |                     
            //   c705????????01000000     |     
            //   80660100             | and                 byte ptr [esi + 1], 0
            //   57                   | push                edi
            //   8806                 | mov                 byte ptr [esi], al

        $sequence_5 = { 8945f8 8b45ec 85c0 8945fc }
            // n = 4, score = 100
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   85c0                 | test                eax, eax
            //   8945fc               | mov                 dword ptr [ebp - 4], eax

        $sequence_6 = { c20400 55 8bec b804280000 }
            // n = 4, score = 100
            //   c20400               | ret                 4
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   b804280000           | mov                 eax, 0x2804

        $sequence_7 = { 750b ff442414 837c24147a 7cc5 837c24147a 741b 55 }
            // n = 7, score = 100
            //   750b                 | jne                 0xd
            //   ff442414             | inc                 dword ptr [esp + 0x14]
            //   837c24147a           | cmp                 dword ptr [esp + 0x14], 0x7a
            //   7cc5                 | jl                  0xffffffc7
            //   837c24147a           | cmp                 dword ptr [esp + 0x14], 0x7a
            //   741b                 | je                  0x1d
            //   55                   | push                ebp

        $sequence_8 = { 57 e8???????? 59 50 57 ffb69c841e00 }
            // n = 6, score = 100
            //   57                   | push                edi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   57                   | push                edi
            //   ffb69c841e00         | push                dword ptr [esi + 0x1e849c]

        $sequence_9 = { ff75fc ff15???????? 56 e8???????? 59 b804110000 0145f0 }
            // n = 7, score = 100
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff15????????         |                     
            //   56                   | push                esi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   b804110000           | mov                 eax, 0x1104
            //   0145f0               | add                 dword ptr [ebp - 0x10], eax

    condition:
        7 of them and filesize < 8060928
}
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