SYMBOLCOMMON_NAMEaka. SYNONYMS
win.freenki (Back to overview)

Freenki Loader

Actor(s): APT37


There is no description at this point.

References
2020-12-15Trend MicroWilliam Gamazo Sanchez
@online{sanchez:20201215:who:c723930, author = {William Gamazo Sanchez}, title = {{Who is the Threat Actor Behind Operation Earth Kitsune?}}, date = {2020-12-15}, organization = {Trend Micro}, url = {https://www.trendmicro.com/en_us/research/20/l/who-is-the-threat-actor-behind-operation-earth-kitsune-.html}, language = {English}, urldate = {2020-12-16} } Who is the Threat Actor Behind Operation Earth Kitsune?
Freenki Loader SLUB
2018-01-16Cisco TalosWarren Mercer, Paul Rascagnères, Jungsoo An
@online{mercer:20180116:korea:f462331, author = {Warren Mercer and Paul Rascagnères and Jungsoo An}, title = {{Korea In The Crosshairs}}, date = {2018-01-16}, organization = {Cisco Talos}, url = {http://blog.talosintelligence.com/2018/01/korea-in-crosshairs.html}, language = {English}, urldate = {2020-01-06} } Korea In The Crosshairs
Freenki Loader PoohMilk Loader RokRAT APT37
2018-01-16Cisco TalosWarren Mercer, Paul Rascagnères
@online{mercer:20180116:korea:02f4c3c, author = {Warren Mercer and Paul Rascagnères}, title = {{Korea In The Crosshairs}}, date = {2018-01-16}, organization = {Cisco Talos}, url = {https://blog.talosintelligence.com/2018/01/korea-in-crosshairs.html}, language = {English}, urldate = {2020-04-06} } Korea In The Crosshairs
Freenki Loader RokRAT APT37
2017-10-05Palo Alto Networks Unit 42Juan Cortes, Esmid Idrizovic
@online{cortes:20171005:freemilk:a929f1b, author = {Juan Cortes and Esmid Idrizovic}, title = {{FreeMilk: A Highly Targeted Spear Phishing Campaign}}, date = {2017-10-05}, organization = {Palo Alto Networks Unit 42}, url = {https://researchcenter.paloaltonetworks.com/2017/10/unit42-freemilk-highly-targeted-spear-phishing-campaign/}, language = {English}, urldate = {2019-12-20} } FreeMilk: A Highly Targeted Spear Phishing Campaign
Freenki Loader PoohMilk Loader
Yara Rules
[TLP:WHITE] win_freenki_auto (20220808 | Detects win.freenki.)
rule win_freenki_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.freenki."
        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.freenki"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 6bc830 8b049578394200 8a440828 a848 }
            // n = 4, score = 200
            //   6bc830               | imul                ecx, eax, 0x30
            //   8b049578394200       | mov                 eax, dword ptr [edx*4 + 0x423978]
            //   8a440828             | mov                 al, byte ptr [eax + ecx + 0x28]
            //   a848                 | test                al, 0x48

        $sequence_1 = { 68???????? 8d8dccedffff e8???????? 33c0 c7461407000000 3985dcedffff }
            // n = 6, score = 200
            //   68????????           |                     
            //   8d8dccedffff         | lea                 ecx, [ebp - 0x1234]
            //   e8????????           |                     
            //   33c0                 | xor                 eax, eax
            //   c7461407000000       | mov                 dword ptr [esi + 0x14], 7
            //   3985dcedffff         | cmp                 dword ptr [ebp - 0x1224], eax

        $sequence_2 = { ffb560ffffff ff7604 ff15???????? 85c0 7422 894608 8b8560ffffff }
            // n = 7, score = 200
            //   ffb560ffffff         | push                dword ptr [ebp - 0xa0]
            //   ff7604               | push                dword ptr [esi + 4]
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7422                 | je                  0x24
            //   894608               | mov                 dword ptr [esi + 8], eax
            //   8b8560ffffff         | mov                 eax, dword ptr [ebp - 0xa0]

        $sequence_3 = { ff15???????? 8b45f4 85c0 7511 }
            // n = 4, score = 200
            //   ff15????????         |                     
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   85c0                 | test                eax, eax
            //   7511                 | jne                 0x13

        $sequence_4 = { c1fa06 6bc830 881f 8b049578394200 f644082880 7507 33c0 }
            // n = 7, score = 200
            //   c1fa06               | sar                 edx, 6
            //   6bc830               | imul                ecx, eax, 0x30
            //   881f                 | mov                 byte ptr [edi], bl
            //   8b049578394200       | mov                 eax, dword ptr [edx*4 + 0x423978]
            //   f644082880           | test                byte ptr [eax + ecx + 0x28], 0x80
            //   7507                 | jne                 9
            //   33c0                 | xor                 eax, eax

        $sequence_5 = { 75e8 eb1e bf50000000 90 0fb7840d06efffff }
            // n = 5, score = 200
            //   75e8                 | jne                 0xffffffea
            //   eb1e                 | jmp                 0x20
            //   bf50000000           | mov                 edi, 0x50
            //   90                   | nop                 
            //   0fb7840d06efffff     | movzx               eax, word ptr [ebp + ecx - 0x10fa]

        $sequence_6 = { ff5108 8b4dd8 85c9 0f8527ffffff 8b45e4 50 8b08 }
            // n = 7, score = 200
            //   ff5108               | call                dword ptr [ecx + 8]
            //   8b4dd8               | mov                 ecx, dword ptr [ebp - 0x28]
            //   85c9                 | test                ecx, ecx
            //   0f8527ffffff         | jne                 0xffffff2d
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   50                   | push                eax
            //   8b08                 | mov                 ecx, dword ptr [eax]

        $sequence_7 = { 50 6a00 ff15???????? eb19 33c9 0fb78194f74100 }
            // n = 6, score = 200
            //   50                   | push                eax
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   eb19                 | jmp                 0x1b
            //   33c9                 | xor                 ecx, ecx
            //   0fb78194f74100       | movzx               eax, word ptr [ecx + 0x41f794]

        $sequence_8 = { 50 0f1145ec 899dfce6ffff e8???????? b963000000 8dbddcf6ffff be???????? }
            // n = 7, score = 200
            //   50                   | push                eax
            //   0f1145ec             | movups              xmmword ptr [ebp - 0x14], xmm0
            //   899dfce6ffff         | mov                 dword ptr [ebp - 0x1904], ebx
            //   e8????????           |                     
            //   b963000000           | mov                 ecx, 0x63
            //   8dbddcf6ffff         | lea                 edi, [ebp - 0x924]
            //   be????????           |                     

        $sequence_9 = { 894de4 399808224200 0f84ea000000 41 }
            // n = 4, score = 200
            //   894de4               | mov                 dword ptr [ebp - 0x1c], ecx
            //   399808224200         | cmp                 dword ptr [eax + 0x422208], ebx
            //   0f84ea000000         | je                  0xf0
            //   41                   | inc                 ecx

    condition:
        7 of them and filesize < 327680
}
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