SYMBOLCOMMON_NAMEaka. SYNONYMS
win.rockloader (Back to overview)

Rockloader


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References
2021-09-03Trend MicroMohamad Mokbel
@techreport{mokbel:20210903:state:df86499, author = {Mohamad Mokbel}, title = {{The State of SSL/TLS Certificate Usage in Malware C&C Communications}}, date = {2021-09-03}, institution = {Trend Micro}, url = {https://www.trendmicro.com/content/dam/trendmicro/global/en/research/21/i/ssl-tls-technical-brief/ssl-tls-technical-brief.pdf}, language = {English}, urldate = {2021-09-19} } The State of SSL/TLS Certificate Usage in Malware C&C Communications
AdWind ostap AsyncRAT BazarBackdoor BitRAT Buer Chthonic CloudEyE Cobalt Strike DCRat Dridex FindPOS GootKit Gozi IcedID ISFB Nanocore RAT Orcus RAT PandaBanker Qadars QakBot Quasar RAT Rockloader ServHelper Shifu SManager TorrentLocker TrickBot Vawtrak Zeus Zloader
2020-05-21Intel 471Intel 471
@online{471:20200521:brief:048d164, author = {Intel 471}, title = {{A brief history of TA505}}, date = {2020-05-21}, organization = {Intel 471}, url = {https://blog.intel471.com/2020/05/21/a-brief-history-of-ta505/}, language = {English}, urldate = {2020-05-23} } A brief history of TA505
AndroMut Bart Dridex FlawedAmmyy FlawedGrace Gandcrab Get2 GlobeImposter Jaff Kegotip Locky Necurs Philadephia Ransom Pony QuantLoader Rockloader SDBbot ServHelper Shifu Snatch TrickBot
2016-04-06ProofpointChris Wakelin
@online{wakelin:20160406:locky:c653996, author = {Chris Wakelin}, title = {{Locky Ransomware Is Becoming More Sophisticated - Cybercriminals Continue Email Campaign Innovation}}, date = {2016-04-06}, organization = {Proofpoint}, url = {https://www.proofpoint.com/us/threat-insight/post/Locky-Ransomware-Cybercriminals-Introduce-New-RockLoader-Malware}, language = {English}, urldate = {2019-12-20} } Locky Ransomware Is Becoming More Sophisticated - Cybercriminals Continue Email Campaign Innovation
Rockloader
Yara Rules
[TLP:WHITE] win_rockloader_auto (20211008 | Detects win.rockloader.)
rule win_rockloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-10-07"
        version = "1"
        description = "Detects win.rockloader."
        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.rockloader"
        malpedia_rule_date = "20211007"
        malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535"
        malpedia_version = "20211008"
        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 = { 803822 8bcf 7419 a3???????? 33c0 e9???????? }
            // n = 6, score = 300
            //   803822               | cmp                 byte ptr [eax], 0x22
            //   8bcf                 | mov                 ecx, edi
            //   7419                 | je                  0x1b
            //   a3????????           |                     
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     

        $sequence_1 = { 7e17 8b45f8 8b04b0 85c0 7407 }
            // n = 5, score = 300
            //   7e17                 | jle                 0x19
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8b04b0               | mov                 eax, dword ptr [eax + esi*4]
            //   85c0                 | test                eax, eax
            //   7407                 | je                  9

        $sequence_2 = { 51 57 2bc6 8b7508 50 }
            // n = 5, score = 300
            //   51                   | push                ecx
            //   57                   | push                edi
            //   2bc6                 | sub                 eax, esi
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   50                   | push                eax

        $sequence_3 = { 837d1000 7404 c6070a 47 8b45f4 c60700 ff3403 }
            // n = 7, score = 300
            //   837d1000             | cmp                 dword ptr [ebp + 0x10], 0
            //   7404                 | je                  6
            //   c6070a               | mov                 byte ptr [edi], 0xa
            //   47                   | inc                 edi
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   c60700               | mov                 byte ptr [edi], 0
            //   ff3403               | push                dword ptr [ebx + eax]

        $sequence_4 = { 0f8434ffffff 837d1000 c6003a 7404 c6400109 8b4508 }
            // n = 6, score = 300
            //   0f8434ffffff         | je                  0xffffff3a
            //   837d1000             | cmp                 dword ptr [ebp + 0x10], 0
            //   c6003a               | mov                 byte ptr [eax], 0x3a
            //   7404                 | je                  6
            //   c6400109             | mov                 byte ptr [eax + 1], 9
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]

        $sequence_5 = { e8???????? 50 56 e8???????? 85c0 7508 56 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   50                   | push                eax
            //   56                   | push                esi
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7508                 | jne                 0xa
            //   56                   | push                esi

        $sequence_6 = { 48 390424 7317 48 }
            // n = 4, score = 300
            //   48                   | dec                 eax
            //   390424               | cmp                 dword ptr [esp], eax
            //   7317                 | jae                 0x19
            //   48                   | dec                 eax

        $sequence_7 = { 57 b800014480 50 57 57 68???????? }
            // n = 6, score = 300
            //   57                   | push                edi
            //   b800014480           | mov                 eax, 0x80440100
            //   50                   | push                eax
            //   57                   | push                edi
            //   57                   | push                edi
            //   68????????           |                     

        $sequence_8 = { 8365fc00 53 56 57 8b7d08 8a17 33f6 }
            // n = 7, score = 300
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   8a17                 | mov                 dl, byte ptr [edi]
            //   33f6                 | xor                 esi, esi

        $sequence_9 = { 6a03 59 8bc1 03f1 48 742d 48 }
            // n = 7, score = 300
            //   6a03                 | push                3
            //   59                   | pop                 ecx
            //   8bc1                 | mov                 eax, ecx
            //   03f1                 | add                 esi, ecx
            //   48                   | dec                 eax
            //   742d                 | je                  0x2f
            //   48                   | dec                 eax

    condition:
        7 of them and filesize < 98304
}
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