SYMBOLCOMMON_NAMEaka. SYNONYMS
win.webc2_rave (Back to overview)

WebC2-Rave

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_rave_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_webc2_rave_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_rave"
        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 = { be???????? 8d8c241c010000 8a01 8ad0 3a06 }
            // n = 5, score = 100
            //   be????????           |                     
            //   8d8c241c010000       | lea                 ecx, [esp + 0x11c]
            //   8a01                 | mov                 al, byte ptr [ecx]
            //   8ad0                 | mov                 dl, al
            //   3a06                 | cmp                 al, byte ptr [esi]

        $sequence_1 = { 83ec68 8d442410 50 e8???????? 8b4c2474 8b542470 }
            // n = 6, score = 100
            //   83ec68               | sub                 esp, 0x68
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b4c2474             | mov                 ecx, dword ptr [esp + 0x74]
            //   8b542470             | mov                 edx, dword ptr [esp + 0x70]

        $sequence_2 = { 3bdd 57 0f845d010000 8b7c2420 3bfd 0f8451010000 }
            // n = 6, score = 100
            //   3bdd                 | cmp                 ebx, ebp
            //   57                   | push                edi
            //   0f845d010000         | je                  0x163
            //   8b7c2420             | mov                 edi, dword ptr [esp + 0x20]
            //   3bfd                 | cmp                 edi, ebp
            //   0f8451010000         | je                  0x157

        $sequence_3 = { 8a54340c 8854040b 884c340c 7cd5 }
            // n = 4, score = 100
            //   8a54340c             | mov                 dl, byte ptr [esp + esi + 0xc]
            //   8854040b             | mov                 byte ptr [esp + eax + 0xb], dl
            //   884c340c             | mov                 byte ptr [esp + esi + 0xc], cl
            //   7cd5                 | jl                  0xffffffd7

        $sequence_4 = { 2bd5 85d2 7e15 8bca b83d3d3d3d 8bf1 c1e902 }
            // n = 7, score = 100
            //   2bd5                 | sub                 edx, ebp
            //   85d2                 | test                edx, edx
            //   7e15                 | jle                 0x17
            //   8bca                 | mov                 ecx, edx
            //   b83d3d3d3d           | mov                 eax, 0x3d3d3d3d
            //   8bf1                 | mov                 esi, ecx
            //   c1e902               | shr                 ecx, 2

        $sequence_5 = { 03d0 f6c301 8bca 750c 8bc6 be03000000 99 }
            // n = 7, score = 100
            //   03d0                 | add                 edx, eax
            //   f6c301               | test                bl, 1
            //   8bca                 | mov                 ecx, edx
            //   750c                 | jne                 0xe
            //   8bc6                 | mov                 eax, esi
            //   be03000000           | mov                 esi, 3
            //   99                   | cdq                 

        $sequence_6 = { f3ab aa 8d442420 33f6 }
            // n = 4, score = 100
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   aa                   | stosb               byte ptr es:[edi], al
            //   8d442420             | lea                 eax, [esp + 0x20]
            //   33f6                 | xor                 esi, esi

        $sequence_7 = { 89742424 89742428 ff15???????? 3bc6 }
            // n = 4, score = 100
            //   89742424             | mov                 dword ptr [esp + 0x24], esi
            //   89742428             | mov                 dword ptr [esp + 0x28], esi
            //   ff15????????         |                     
            //   3bc6                 | cmp                 eax, esi

        $sequence_8 = { 8b6c2428 83c404 8bf0 8b442418 }
            // n = 4, score = 100
            //   8b6c2428             | mov                 ebp, dword ptr [esp + 0x28]
            //   83c404               | add                 esp, 4
            //   8bf0                 | mov                 esi, eax
            //   8b442418             | mov                 eax, dword ptr [esp + 0x18]

        $sequence_9 = { 8bcd 8bd0 c1ea1a 47 8a9230414000 }
            // n = 5, score = 100
            //   8bcd                 | mov                 ecx, ebp
            //   8bd0                 | mov                 edx, eax
            //   c1ea1a               | shr                 edx, 0x1a
            //   47                   | inc                 edi
            //   8a9230414000         | mov                 dl, byte ptr [edx + 0x404130]

    condition:
        7 of them and filesize < 57344
}
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