SYMBOLCOMMON_NAMEaka. SYNONYMS
win.icondown (Back to overview)

IconDown

Actor(s): BlackTech


There is no description at this point.

References
2019-11-21JPCERT/CC田中 信太郎(Shintaro Tanaka)
@online{tanaka:20191121:icondown:cb082bf, author = {田中 信太郎(Shintaro Tanaka)}, title = {{IconDown – Downloader Used by BlackTech}}, date = {2019-11-21}, organization = {JPCERT/CC}, url = {https://blogs.jpcert.or.jp/en/2019/11/icondown-downloader-used-by-blacktech.html}, language = {English}, urldate = {2020-01-08} } IconDown – Downloader Used by BlackTech
IconDown
Yara Rules
[TLP:WHITE] win_icondown_auto (20230125 | Detects win.icondown.)
rule win_icondown_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.icondown."
        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.icondown"
        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 = { 53 c744242430750000 ff15???????? 8d4c2414 6a04 51 }
            // n = 6, score = 200
            //   53                   | push                ebx
            //   c744242430750000     | mov                 dword ptr [esp + 0x24], 0x7530
            //   ff15????????         |                     
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   6a04                 | push                4
            //   51                   | push                ecx

        $sequence_1 = { f6c201 7416 8088????????10 8a9405ecfdffff 8890c01b4500 }
            // n = 5, score = 200
            //   f6c201               | test                dl, 1
            //   7416                 | je                  0x18
            //   8088????????10       |                     
            //   8a9405ecfdffff       | mov                 dl, byte ptr [ebp + eax - 0x214]
            //   8890c01b4500         | mov                 byte ptr [eax + 0x451bc0], dl

        $sequence_2 = { 85f6 7c45 8b3d???????? 6a00 6a00 6804130000 50 }
            // n = 7, score = 200
            //   85f6                 | test                esi, esi
            //   7c45                 | jl                  0x47
            //   8b3d????????         |                     
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6804130000           | push                0x1304
            //   50                   | push                eax

        $sequence_3 = { 8a542420 64892500000000 88442416 88542417 8b01 8d542414 52 }
            // n = 7, score = 200
            //   8a542420             | mov                 dl, byte ptr [esp + 0x20]
            //   64892500000000       | mov                 dword ptr fs:[0], esp
            //   88442416             | mov                 byte ptr [esp + 0x16], al
            //   88542417             | mov                 byte ptr [esp + 0x17], dl
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   8d542414             | lea                 edx, [esp + 0x14]
            //   52                   | push                edx

        $sequence_4 = { 57 89742408 e8???????? 8d7e70 }
            // n = 4, score = 200
            //   57                   | push                edi
            //   89742408             | mov                 dword ptr [esp + 8], esi
            //   e8????????           |                     
            //   8d7e70               | lea                 edi, [esi + 0x70]

        $sequence_5 = { 83c404 e8???????? 85c0 7538 e8???????? e8???????? e8???????? }
            // n = 7, score = 200
            //   83c404               | add                 esp, 4
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7538                 | jne                 0x3a
            //   e8????????           |                     
            //   e8????????           |                     
            //   e8????????           |                     

        $sequence_6 = { 66894674 66894676 66894678 6689467a e8???????? 8d8e80000000 e8???????? }
            // n = 7, score = 200
            //   66894674             | mov                 word ptr [esi + 0x74], ax
            //   66894676             | mov                 word ptr [esi + 0x76], ax
            //   66894678             | mov                 word ptr [esi + 0x78], ax
            //   6689467a             | mov                 word ptr [esi + 0x7a], ax
            //   e8????????           |                     
            //   8d8e80000000         | lea                 ecx, [esi + 0x80]
            //   e8????????           |                     

        $sequence_7 = { c64424143a c64424152f c64424162f c644241775 884c2418 c644241964 }
            // n = 6, score = 200
            //   c64424143a           | mov                 byte ptr [esp + 0x14], 0x3a
            //   c64424152f           | mov                 byte ptr [esp + 0x15], 0x2f
            //   c64424162f           | mov                 byte ptr [esp + 0x16], 0x2f
            //   c644241775           | mov                 byte ptr [esp + 0x17], 0x75
            //   884c2418             | mov                 byte ptr [esp + 0x18], cl
            //   c644241964           | mov                 byte ptr [esp + 0x19], 0x64

        $sequence_8 = { 50 c745f058d04300 e8???????? 85c0 7403 83ce20 }
            // n = 6, score = 200
            //   50                   | push                eax
            //   c745f058d04300       | mov                 dword ptr [ebp - 0x10], 0x43d058
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7403                 | je                  5
            //   83ce20               | or                  esi, 0x20

        $sequence_9 = { ff15???????? f7df 8b442434 8b4c2410 1bff c744241c00000000 83e7fc }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   f7df                 | neg                 edi
            //   8b442434             | mov                 eax, dword ptr [esp + 0x34]
            //   8b4c2410             | mov                 ecx, dword ptr [esp + 0x10]
            //   1bff                 | sbb                 edi, edi
            //   c744241c00000000     | mov                 dword ptr [esp + 0x1c], 0
            //   83e7fc               | and                 edi, 0xfffffffc

    condition:
        7 of them and filesize < 5505024
}
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