SYMBOLCOMMON_NAMEaka. SYNONYMS
win.selfmake (Back to overview)

SelfMake Loader

Actor(s): BlackTech


There is no description at this point.

References
2022-09-29NTTNTT Security Holdings Corporation
@techreport{corporation:20220929:report:1615dab, author = {NTT Security Holdings Corporation}, title = {{Report on APT Attacks by BlackTech}}, date = {2022-09-29}, institution = {NTT}, url = {https://jp.security.ntt/resources/EN-BlackTech_2021.pdf}, language = {English}, urldate = {2022-09-30} } Report on APT Attacks by BlackTech
Bifrost PLEAD TSCookie Flagpro Gh0stTimes SelfMake Loader SPIDERPIG RAT
2022-01-13Twitter (@8th_grey_owl)8thGreyOwl
@online{8thgreyowl:20220113:selfmake:b0e52ab, author = {8thGreyOwl}, title = {{Tweet on SelfMake Loader}}, date = {2022-01-13}, organization = {Twitter (@8th_grey_owl)}, url = {https://twitter.com/8th_grey_owl/status/1481433481485844483}, language = {English}, urldate = {2022-01-19} } Tweet on SelfMake Loader
SelfMake Loader
Yara Rules
[TLP:WHITE] win_selfmake_auto (20230125 | Detects win.selfmake.)
rule win_selfmake_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.selfmake."
        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.selfmake"
        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 = { 8b4d0c 51 8d55f0 52 8b4dec }
            // n = 5, score = 400
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   51                   | push                ecx
            //   8d55f0               | lea                 edx, [ebp - 0x10]
            //   52                   | push                edx
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]

        $sequence_1 = { 83e107 894df4 8b55f4 52 ff15???????? a1???????? 8be5 }
            // n = 7, score = 400
            //   83e107               | and                 ecx, 7
            //   894df4               | mov                 dword ptr [ebp - 0xc], ecx
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]
            //   52                   | push                edx
            //   ff15????????         |                     
            //   a1????????           |                     
            //   8be5                 | mov                 esp, ebp

        $sequence_2 = { 8d4c2420 51 8be8 6a1f }
            // n = 4, score = 400
            //   8d4c2420             | lea                 ecx, [esp + 0x20]
            //   51                   | push                ecx
            //   8be8                 | mov                 ebp, eax
            //   6a1f                 | push                0x1f

        $sequence_3 = { 83c408 68???????? e8???????? 83c040 50 e8???????? 8b431c }
            // n = 7, score = 400
            //   83c408               | add                 esp, 8
            //   68????????           |                     
            //   e8????????           |                     
            //   83c040               | add                 eax, 0x40
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b431c               | mov                 eax, dword ptr [ebx + 0x1c]

        $sequence_4 = { 56 6a01 51 8d54247c 52 e8???????? }
            // n = 6, score = 400
            //   56                   | push                esi
            //   6a01                 | push                1
            //   51                   | push                ecx
            //   8d54247c             | lea                 edx, [esp + 0x7c]
            //   52                   | push                edx
            //   e8????????           |                     

        $sequence_5 = { 56 6a01 8d54240c 6a04 52 e8???????? }
            // n = 6, score = 400
            //   56                   | push                esi
            //   6a01                 | push                1
            //   8d54240c             | lea                 edx, [esp + 0xc]
            //   6a04                 | push                4
            //   52                   | push                edx
            //   e8????????           |                     

        $sequence_6 = { 68???????? e8???????? 83c40c ff15???????? a3???????? 68???????? }
            // n = 6, score = 400
            //   68????????           |                     
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   ff15????????         |                     
            //   a3????????           |                     
            //   68????????           |                     

        $sequence_7 = { 50 ff15???????? 833d????????00 7425 833d????????00 741c }
            // n = 6, score = 400
            //   50                   | push                eax
            //   ff15????????         |                     
            //   833d????????00       |                     
            //   7425                 | je                  0x27
            //   833d????????00       |                     
            //   741c                 | je                  0x1e

        $sequence_8 = { c3 8b460c 53 3bc7 }
            // n = 4, score = 400
            //   c3                   | ret                 
            //   8b460c               | mov                 eax, dword ptr [esi + 0xc]
            //   53                   | push                ebx
            //   3bc7                 | cmp                 eax, edi

        $sequence_9 = { 8b85a0fbffff 50 6a00 8b4d08 51 }
            // n = 5, score = 400
            //   8b85a0fbffff         | mov                 eax, dword ptr [ebp - 0x460]
            //   50                   | push                eax
            //   6a00                 | push                0
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 932864
}
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