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 (20230125 | Detects win.classfon.)
rule win_classfon_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.classfon."
        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.classfon"
        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 = { ff15???????? 5e c3 83ec08 56 57 8b7c2414 }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   5e                   | pop                 esi
            //   c3                   | ret                 
            //   83ec08               | sub                 esp, 8
            //   56                   | push                esi
            //   57                   | push                edi
            //   8b7c2414             | mov                 edi, dword ptr [esp + 0x14]

        $sequence_1 = { 03c2 894500 897034 8b442420 }
            // n = 4, score = 200
            //   03c2                 | add                 eax, edx
            //   894500               | mov                 dword ptr [ebp], eax
            //   897034               | mov                 dword ptr [eax + 0x34], esi
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]

        $sequence_2 = { 51 8b4c2414 8d442424 52 50 55 68???????? }
            // n = 7, score = 200
            //   51                   | push                ecx
            //   8b4c2414             | mov                 ecx, dword ptr [esp + 0x14]
            //   8d442424             | lea                 eax, [esp + 0x24]
            //   52                   | push                edx
            //   50                   | push                eax
            //   55                   | push                ebp
            //   68????????           |                     

        $sequence_3 = { 51 68???????? 52 c744241001000000 89442424 ff15???????? 85c0 }
            // n = 7, score = 200
            //   51                   | push                ecx
            //   68????????           |                     
            //   52                   | push                edx
            //   c744241001000000     | mov                 dword ptr [esp + 0x10], 1
            //   89442424             | mov                 dword ptr [esp + 0x24], eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_4 = { 85c0 0f8499000000 8b842414020000 85c0 }
            // n = 4, score = 200
            //   85c0                 | test                eax, eax
            //   0f8499000000         | je                  0x9f
            //   8b842414020000       | mov                 eax, dword ptr [esp + 0x214]
            //   85c0                 | test                eax, eax

        $sequence_5 = { 85c0 7462 8b542408 8b8e00020000 8b44240c 6a00 6a00 }
            // n = 7, score = 200
            //   85c0                 | test                eax, eax
            //   7462                 | je                  0x64
            //   8b542408             | mov                 edx, dword ptr [esp + 8]
            //   8b8e00020000         | mov                 ecx, dword ptr [esi + 0x200]
            //   8b44240c             | mov                 eax, dword ptr [esp + 0xc]
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_6 = { 68???????? 68???????? 6802000080 e8???????? a1???????? 83c410 }
            // n = 6, score = 200
            //   68????????           |                     
            //   68????????           |                     
            //   6802000080           | push                0x80000002
            //   e8????????           |                     
            //   a1????????           |                     
            //   83c410               | add                 esp, 0x10

        $sequence_7 = { 57 ffd6 8b5354 6a04 6800100000 52 57 }
            // n = 7, score = 200
            //   57                   | push                edi
            //   ffd6                 | call                esi
            //   8b5354               | mov                 edx, dword ptr [ebx + 0x54]
            //   6a04                 | push                4
            //   6800100000           | push                0x1000
            //   52                   | push                edx
            //   57                   | push                edi

        $sequence_8 = { 683f000f00 6a00 6a00 ff15???????? 85c0 89442414 0f8402010000 }
            // n = 7, score = 200
            //   683f000f00           | push                0xf003f
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   89442414             | mov                 dword ptr [esp + 0x14], eax
            //   0f8402010000         | je                  0x108

        $sequence_9 = { 8b35???????? 57 8bbc24dc070000 6800010000 8b07 50 51 }
            // n = 7, score = 200
            //   8b35????????         |                     
            //   57                   | push                edi
            //   8bbc24dc070000       | mov                 edi, dword ptr [esp + 0x7dc]
            //   6800010000           | push                0x100
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   50                   | push                eax
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 73728
}
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