SYMBOLCOMMON_NAMEaka. SYNONYMS
win.powerloader (Back to overview)

PowerLoader


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References
2013-08-13MalwareTechMalwareTech
@online{malwaretech:20130813:powerloader:9853b70, author = {MalwareTech}, title = {{PowerLoader Injection – Something truly amazing}}, date = {2013-08-13}, organization = {MalwareTech}, url = {https://www.malwaretech.com/2013/08/powerloader-injection-something-truly.html}, language = {English}, urldate = {2020-07-15} } PowerLoader Injection – Something truly amazing
PowerLoader
Yara Rules
[TLP:WHITE] win_powerloader_auto (20220808 | Detects win.powerloader.)
rule win_powerloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.powerloader."
        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.powerloader"
        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 = { ff15???????? 83f81f 7323 ff15???????? }
            // n = 4, score = 300
            //   ff15????????         |                     
            //   83f81f               | mov                 edi, ecx
            //   7323                 | dec                 eax
            //   ff15????????         |                     

        $sequence_1 = { ff15???????? 83f803 7405 83f802 7530 }
            // n = 5, score = 300
            //   ff15????????         |                     
            //   83f803               | dec                 eax
            //   7405                 | lea                 edx, [0x40e5]
            //   83f802               | dec                 eax
            //   7530                 | lea                 ecx, [esp + 0x40]

        $sequence_2 = { e8???????? 0fb6d8 84c0 7514 }
            // n = 4, score = 300
            //   e8????????           |                     
            //   0fb6d8               | mov                 dword ptr [ebp - 0x30], esi
            //   84c0                 | mov                 dword ptr [ebp - 0x34], 0x407a8c
            //   7514                 | mov                 dword ptr [esp + 0x38], edi

        $sequence_3 = { 32db e8???????? 3bc7 7349 }
            // n = 4, score = 300
            //   32db                 | test                al, al
            //   e8????????           |                     
            //   3bc7                 | jne                 0x41
            //   7349                 | dec                 eax

        $sequence_4 = { 8bd0 e8???????? 85ff 740c }
            // n = 4, score = 300
            //   8bd0                 | dec                 esp
            //   e8????????           |                     
            //   85ff                 | lea                 eax, [esp + 0x140]
            //   740c                 | dec                 eax

        $sequence_5 = { 33d2 ff15???????? 83f81f 7323 ff15???????? }
            // n = 5, score = 300
            //   33d2                 | movzx               ecx, byte ptr [ecx + 0x4045d0]
            //   ff15????????         |                     
            //   83f81f               | lea                 edx, [ebx + 0x22]
            //   7323                 | dec                 eax
            //   ff15????????         |                     

        $sequence_6 = { 33d2 c605????????00 e8???????? 0fb6c3 }
            // n = 4, score = 300
            //   33d2                 | dec                 eax
            //   c605????????00       |                     
            //   e8????????           |                     
            //   0fb6c3               | mov                 dword ptr [esp + 0x30], eax

        $sequence_7 = { 7441 8b5c2430 85db 741d }
            // n = 4, score = 300
            //   7441                 | dec                 esp
            //   8b5c2430             | lea                 eax, [esp + 0x40]
            //   85db                 | dec                 eax
            //   741d                 | mov                 dword ptr [esp + 0x30], ecx

        $sequence_8 = { e8???????? 8b7c2430 85ed 740d }
            // n = 4, score = 300
            //   e8????????           |                     
            //   8b7c2430             | dec                 eax
            //   85ed                 | lea                 edx, [esp + 0x30]
            //   740d                 | mov                 edx, eax

        $sequence_9 = { e8???????? 0fb6d8 85ff 740c }
            // n = 4, score = 300
            //   e8????????           |                     
            //   0fb6d8               | dec                 eax
            //   85ff                 | lea                 edx, [0x1e87]
            //   740c                 | mov                 dword ptr [esp + 0x78], edi

    condition:
        7 of them and filesize < 155648
}
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