SYMBOLCOMMON_NAMEaka. SYNONYMS
win.chthonic (Back to overview)

Chthonic

aka: AndroKINS
URLhaus    

There is no description at this point.

References
2017-08-24Blaze's Security BlogBartBlaze
@online{bartblaze:20170824:crystal:16adb4a, author = {BartBlaze}, title = {{Crystal Finance Millennium used to spread malware}}, date = {2017-08-24}, organization = {Blaze's Security Blog}, url = {https://bartblaze.blogspot.com/2017/08/crystal-finance-millennium-used-to.html}, language = {English}, urldate = {2020-02-01} } Crystal Finance Millennium used to spread malware
Chthonic SmokeLoader
2016-07-26ProofpointProofpoint
@online{proofpoint:20160726:threat:076e87a, author = {Proofpoint}, title = {{Threat Actors Using Legitimate PayPal Accounts To Distribute Chthonic Banking Trojan}}, date = {2016-07-26}, organization = {Proofpoint}, url = {https://www.proofpoint.com/us/threat-insight/post/threat-actors-using-legitimate-paypal-accounts-to-distribute-chthonic-banking-trojan}, language = {English}, urldate = {2019-07-09} } Threat Actors Using Legitimate PayPal Accounts To Distribute Chthonic Banking Trojan
Azorult Chthonic
Yara Rules
[TLP:WHITE] win_chthonic_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_chthonic_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.chthonic"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { ff7508 66894108 b8ecff0000 660145f0 }
            // n = 4, score = 600
            //   ff7508               | push                dword ptr [ebp + 8]
            //   66894108             | mov                 word ptr [ecx + 8], ax
            //   b8ecff0000           | mov                 eax, 0xffec
            //   660145f0             | add                 word ptr [ebp - 0x10], ax

        $sequence_1 = { b001 c3 8b442404 8b08 8a4901 53 8ad9 }
            // n = 7, score = 600
            //   b001                 | mov                 al, 1
            //   c3                   | ret                 
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   8a4901               | mov                 cl, byte ptr [ecx + 1]
            //   53                   | push                ebx
            //   8ad9                 | mov                 bl, cl

        $sequence_2 = { 53 ff7510 ff7508 e8???????? 85c0 7502 }
            // n = 6, score = 600
            //   53                   | push                ebx
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7502                 | jne                 4

        $sequence_3 = { 85ff 0f848d010000 4f 8bf0 8bcf d3ee 83e601 }
            // n = 7, score = 600
            //   85ff                 | test                edi, edi
            //   0f848d010000         | je                  0x193
            //   4f                   | dec                 edi
            //   8bf0                 | mov                 esi, eax
            //   8bcf                 | mov                 ecx, edi
            //   d3ee                 | shr                 esi, cl
            //   83e601               | and                 esi, 1

        $sequence_4 = { e9???????? 0fb60c1a 83c6fd c1e608 03ce }
            // n = 5, score = 600
            //   e9????????           |                     
            //   0fb60c1a             | movzx               ecx, byte ptr [edx + ebx]
            //   83c6fd               | add                 esi, -3
            //   c1e608               | shl                 esi, 8
            //   03ce                 | add                 ecx, esi

        $sequence_5 = { 53 ff7510 ff7508 e8???????? 85c0 }
            // n = 5, score = 600
            //   53                   | push                ebx
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_6 = { 85ff 0f845d010000 4f 8bf0 8bcf d3ee }
            // n = 6, score = 600
            //   85ff                 | test                edi, edi
            //   0f845d010000         | je                  0x163
            //   4f                   | dec                 edi
            //   8bf0                 | mov                 esi, eax
            //   8bcf                 | mov                 ecx, edi
            //   d3ee                 | shr                 esi, cl

        $sequence_7 = { d3ee 83e601 eb00 8b4df8 }
            // n = 4, score = 600
            //   d3ee                 | shr                 esi, cl
            //   83e601               | and                 esi, 1
            //   eb00                 | jmp                 2
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]

        $sequence_8 = { 8b10 8911 0fb64dff 46 }
            // n = 4, score = 600
            //   8b10                 | mov                 edx, dword ptr [eax]
            //   8911                 | mov                 dword ptr [ecx], edx
            //   0fb64dff             | movzx               ecx, byte ptr [ebp - 1]
            //   46                   | inc                 esi

        $sequence_9 = { 03c2 25ff000080 7907 48 0d00ffffff 40 8a8485fcfbffff }
            // n = 7, score = 600
            //   03c2                 | add                 eax, edx
            //   25ff000080           | and                 eax, 0x800000ff
            //   7907                 | jns                 9
            //   48                   | dec                 eax
            //   0d00ffffff           | or                  eax, 0xffffff00
            //   40                   | inc                 eax
            //   8a8485fcfbffff       | mov                 al, byte ptr [ebp + eax*4 - 0x404]

    condition:
        7 of them and filesize < 425984
}
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