SYMBOLCOMMON_NAMEaka. SYNONYMS
win.classfon (Back to overview)

CLASSFON


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References
2019-08-09FireEyeFireEye
@online{fireeye:20190809:double:40f736e, author = {FireEye}, title = {{Double Dragon APT41, a dual espionage and cyber crime operation}}, date = {2019-08-09}, organization = {FireEye}, url = {https://content.fireeye.com/apt-41/rpt-apt41/}, language = {English}, urldate = {2019-12-18} } Double Dragon APT41, a dual espionage and cyber crime operation
CLASSFON crackshot CROSSWALK GEARSHIFT HIGHNOON HIGHNOON.BIN JUMPALL poisonplug Winnti
Yara Rules
[TLP:WHITE] win_classfon_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_classfon_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.classfon"
        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 = { 6804010000 66ab 52 68???????? 6802000080 }
            // n = 5, score = 100
            //   6804010000           | push                0x104
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   52                   | push                edx
            //   68????????           |                     
            //   6802000080           | push                0x80000002

        $sequence_1 = { 8b35???????? ffd6 57 ffd6 33c0 8b4df0 64890d00000000 }
            // n = 7, score = 100
            //   8b35????????         |                     
            //   ffd6                 | call                esi
            //   57                   | push                edi
            //   ffd6                 | call                esi
            //   33c0                 | xor                 eax, eax
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx

        $sequence_2 = { 8b35???????? 81c48c030000 6a0a ffd6 a1???????? 83f803 }
            // n = 6, score = 100
            //   8b35????????         |                     
            //   81c48c030000         | add                 esp, 0x38c
            //   6a0a                 | push                0xa
            //   ffd6                 | call                esi
            //   a1????????           |                     
            //   83f803               | cmp                 eax, 3

        $sequence_3 = { 6a00 ff15???????? 85c0 89442414 }
            // n = 4, score = 100
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   89442414             | mov                 dword ptr [esp + 0x14], eax

        $sequence_4 = { 7518 c745fcffffffff 8b4df0 64890d00000000 5f 5e }
            // n = 6, score = 100
            //   7518                 | jne                 0x1a
            //   c745fcffffffff       | mov                 dword ptr [ebp - 4], 0xffffffff
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_5 = { 03c2 894500 897034 8b442420 50 e8???????? }
            // n = 6, score = 100
            //   03c2                 | add                 eax, edx
            //   894500               | mov                 dword ptr [ebp], eax
            //   897034               | mov                 dword ptr [eax + 0x34], esi
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_6 = { 51 ffd6 8b17 6800010000 8d84245c030000 52 }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   ffd6                 | call                esi
            //   8b17                 | mov                 edx, dword ptr [edi]
            //   6800010000           | push                0x100
            //   8d84245c030000       | lea                 eax, [esp + 0x35c]
            //   52                   | push                edx

        $sequence_7 = { 51 50 c744241400000000 ff15???????? 85c0 7462 }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   50                   | push                eax
            //   c744241400000000     | mov                 dword ptr [esp + 0x14], 0
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7462                 | je                  0x64

        $sequence_8 = { 8bf0 56 ffd3 85f6 7545 }
            // n = 5, score = 100
            //   8bf0                 | mov                 esi, eax
            //   56                   | push                esi
            //   ffd3                 | call                ebx
            //   85f6                 | test                esi, esi
            //   7545                 | jne                 0x47

        $sequence_9 = { 2bc1 740a 50 55 e8???????? 83c408 55 }
            // n = 7, score = 100
            //   2bc1                 | sub                 eax, ecx
            //   740a                 | je                  0xc
            //   50                   | push                eax
            //   55                   | push                ebp
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   55                   | push                ebp

    condition:
        7 of them and filesize < 73728
}
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