SYMBOLCOMMON_NAMEaka. SYNONYMS
win.privateloader (Back to overview)

PrivateLoader


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References
2022-06-06André Tavares
@online{tavares:20220606:hunting:9e20d11, author = {André Tavares}, title = {{Hunting PrivateLoader: Pay-Per-Install Service}}, date = {2022-06-06}, url = {https://tavares.re/blog/2022/06/06/hunting-privateloader-pay-per-install-service/}, language = {English}, urldate = {2022-06-09} } Hunting PrivateLoader: Pay-Per-Install Service
PrivateLoader
2022-05-05Trend MicroAliakbar Zahravi, Leandro Froes, Trend Micro Research
@online{zahravi:20220505:netdooka:93197bf, author = {Aliakbar Zahravi and Leandro Froes and Trend Micro Research}, title = {{NetDooka Framework Distributed via PrivateLoader Malware as Part of Pay-Per-Install Service}}, date = {2022-05-05}, organization = {Trend Micro}, url = {https://www.trendmicro.com/en_us/research/22/e/netdooka-framework-distributed-via-privateloader-ppi.html}, language = {English}, urldate = {2022-05-05} } NetDooka Framework Distributed via PrivateLoader Malware as Part of Pay-Per-Install Service
NetDooka PrivateLoader
2022-04-29Intel 471Souhail Hammou
@online{hammou:20220429:privateloader:1378b6b, author = {Souhail Hammou}, title = {{Privateloader – The Malware Behind A Havoc-Wreaking Pay-Per-Install Service}}, date = {2022-04-29}, organization = {Intel 471}, url = {https://www.youtube.com/watch?v=Ldp7eESQotM}, language = {English}, urldate = {2022-05-09} } Privateloader – The Malware Behind A Havoc-Wreaking Pay-Per-Install Service
PrivateLoader
2022-04-28ZscalerDennis Schwarz, Brett Stone-Gross
@online{schwarz:20220428:peeking:f8226bb, author = {Dennis Schwarz and Brett Stone-Gross}, title = {{Peeking into PrivateLoader}}, date = {2022-04-28}, organization = {Zscaler}, url = {https://www.zscaler.com/blogs/security-research/peeking-privateloader}, language = {English}, urldate = {2022-05-04} } Peeking into PrivateLoader
PrivateLoader
2022-02-08Intel 471Intel 471
@online{471:20220208:privateloader:5e226cd, author = {Intel 471}, title = {{PrivateLoader: The first step in many malware schemes}}, date = {2022-02-08}, organization = {Intel 471}, url = {https://intel471.com/blog/privateloader-malware}, language = {English}, urldate = {2022-05-09} } PrivateLoader: The first step in many malware schemes
Dridex Kronos LockBit Nanocore RAT NjRAT PrivateLoader Quasar RAT RedLine Stealer Remcos SmokeLoader STOP Tofsee TrickBot Vidar
Yara Rules
[TLP:WHITE] win_privateloader_auto (20220516 | Detects win.privateloader.)
rule win_privateloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.privateloader."
        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.privateloader"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 2b8500fdffff 3bc7 7218 837a1410 7202 8b12 57 }
            // n = 7, score = 100
            //   2b8500fdffff         | sub                 eax, dword ptr [ebp - 0x300]
            //   3bc7                 | cmp                 eax, edi
            //   7218                 | jb                  0x1a
            //   837a1410             | cmp                 dword ptr [edx + 0x14], 0x10
            //   7202                 | jb                  4
            //   8b12                 | mov                 edx, dword ptr [edx]
            //   57                   | push                edi

        $sequence_1 = { 8d3c8560704200 8b07 83ceff 3bc6 742b 85c0 7529 }
            // n = 7, score = 100
            //   8d3c8560704200       | lea                 edi, [eax*4 + 0x427060]
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   83ceff               | or                  esi, 0xffffffff
            //   3bc6                 | cmp                 eax, esi
            //   742b                 | je                  0x2d
            //   85c0                 | test                eax, eax
            //   7529                 | jne                 0x2b

        $sequence_2 = { 89b58cfeffff 8b9550feffff 8bb554feffff 8b8558feffff 2bd0 8b8d5cfeffff 8995a0feffff }
            // n = 7, score = 100
            //   89b58cfeffff         | mov                 dword ptr [ebp - 0x174], esi
            //   8b9550feffff         | mov                 edx, dword ptr [ebp - 0x1b0]
            //   8bb554feffff         | mov                 esi, dword ptr [ebp - 0x1ac]
            //   8b8558feffff         | mov                 eax, dword ptr [ebp - 0x1a8]
            //   2bd0                 | sub                 edx, eax
            //   8b8d5cfeffff         | mov                 ecx, dword ptr [ebp - 0x1a4]
            //   8995a0feffff         | mov                 dword ptr [ebp - 0x160], edx

        $sequence_3 = { 6a00 6a00 6a00 c745fc00000000 a1???????? }
            // n = 5, score = 100
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   a1????????           |                     

        $sequence_4 = { 6a00 53 57 52 ffd0 894608 85c0 }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   53                   | push                ebx
            //   57                   | push                edi
            //   52                   | push                edx
            //   ffd0                 | call                eax
            //   894608               | mov                 dword ptr [esi + 8], eax
            //   85c0                 | test                eax, eax

        $sequence_5 = { c745d0f0da3a92 c745d4f0da5690 c745d8f0da3a92 c745dcf0daea4e 660fef4dd0 50 }
            // n = 6, score = 100
            //   c745d0f0da3a92       | mov                 dword ptr [ebp - 0x30], 0x923adaf0
            //   c745d4f0da5690       | mov                 dword ptr [ebp - 0x2c], 0x9056daf0
            //   c745d8f0da3a92       | mov                 dword ptr [ebp - 0x28], 0x923adaf0
            //   c745dcf0daea4e       | mov                 dword ptr [ebp - 0x24], 0x4eeadaf0
            //   660fef4dd0           | pxor                xmm1, xmmword ptr [ebp - 0x30]
            //   50                   | push                eax

        $sequence_6 = { 897de4 8365fc00 8b049df8714200 8b4de0 f644012801 7515 e8???????? }
            // n = 7, score = 100
            //   897de4               | mov                 dword ptr [ebp - 0x1c], edi
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   8b049df8714200       | mov                 eax, dword ptr [ebx*4 + 0x4271f8]
            //   8b4de0               | mov                 ecx, dword ptr [ebp - 0x20]
            //   f644012801           | test                byte ptr [ecx + eax + 0x28], 1
            //   7515                 | jne                 0x17
            //   e8????????           |                     

        $sequence_7 = { 899de8f7ffff c685c4f7ffff01 e8???????? a1???????? 53 53 53 }
            // n = 7, score = 100
            //   899de8f7ffff         | mov                 dword ptr [ebp - 0x818], ebx
            //   c685c4f7ffff01       | mov                 byte ptr [ebp - 0x83c], 1
            //   e8????????           |                     
            //   a1????????           |                     
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx

        $sequence_8 = { 660fef8df0feffff 0f298d70ffffff c745803ef49d7e c74584c954ccc6 c74588a3380afc c7458c9c99faaa 0f284d80 }
            // n = 7, score = 100
            //   660fef8df0feffff     | pxor                xmm1, xmmword ptr [ebp - 0x110]
            //   0f298d70ffffff       | movaps              xmmword ptr [ebp - 0x90], xmm1
            //   c745803ef49d7e       | mov                 dword ptr [ebp - 0x80], 0x7e9df43e
            //   c74584c954ccc6       | mov                 dword ptr [ebp - 0x7c], 0xc6cc54c9
            //   c74588a3380afc       | mov                 dword ptr [ebp - 0x78], 0xfc0a38a3
            //   c7458c9c99faaa       | mov                 dword ptr [ebp - 0x74], 0xaafa999c
            //   0f284d80             | movaps              xmm1, xmmword ptr [ebp - 0x80]

        $sequence_9 = { 57 50 e8???????? 83c40c 6b45e430 8945e0 8d8008694200 }
            // n = 7, score = 100
            //   57                   | push                edi
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   6b45e430             | imul                eax, dword ptr [ebp - 0x1c], 0x30
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax
            //   8d8008694200         | lea                 eax, [eax + 0x426908]

    condition:
        7 of them and filesize < 355328
}
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