SYMBOLCOMMON_NAMEaka. SYNONYMS
win.rockloader (Back to overview)

Rockloader


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References
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 (20200529 | autogenerated rule brought to you by yara-signator)
rule win_rockloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.rockloader"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        malpedia_license = "CC BY-NC-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 / approach 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 = { 0fb6c3 50 68???????? e8???????? 85c0 7405 }
            // n = 6, score = 300
            //   0fb6c3               | movzx               eax, bl
            //   50                   | push                eax
            //   68????????           |                     
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7405                 | je                  7

        $sequence_1 = { 33f6 57 dd55e4 33ff 46 }
            // n = 5, score = 300
            //   33f6                 | xor                 esi, esi
            //   57                   | push                edi
            //   dd55e4               | fst                 qword ptr [ebp - 0x1c]
            //   33ff                 | xor                 edi, edi
            //   46                   | inc                 esi

        $sequence_2 = { 8b45f8 8d0488 8b08 894508 8bc1 }
            // n = 5, score = 300
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8d0488               | lea                 eax, [eax + ecx*4]
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   894508               | mov                 dword ptr [ebp + 8], eax
            //   8bc1                 | mov                 eax, ecx

        $sequence_3 = { 3bc2 740e 8b00 41 3bc2 75f9 }
            // n = 6, score = 300
            //   3bc2                 | cmp                 eax, edx
            //   740e                 | je                  0x10
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   41                   | inc                 ecx
            //   3bc2                 | cmp                 eax, edx
            //   75f9                 | jne                 0xfffffffb

        $sequence_4 = { ff7510 ff750c 51 e8???????? e9???????? 8bc6 ff7510 }
            // n = 7, score = 300
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   e9????????           |                     
            //   8bc6                 | mov                 eax, esi
            //   ff7510               | push                dword ptr [ebp + 0x10]

        $sequence_5 = { 8bc8 c1f908 0bc1 8bf8 c1ff10 0bf8 }
            // n = 6, score = 300
            //   8bc8                 | mov                 ecx, eax
            //   c1f908               | sar                 ecx, 8
            //   0bc1                 | or                  eax, ecx
            //   8bf8                 | mov                 edi, eax
            //   c1ff10               | sar                 edi, 0x10
            //   0bf8                 | or                  edi, eax

        $sequence_6 = { 837d1000 741d 83651400 8b5d0c }
            // n = 4, score = 300
            //   837d1000             | cmp                 dword ptr [ebp + 0x10], 0
            //   741d                 | je                  0x1f
            //   83651400             | and                 dword ptr [ebp + 0x14], 0
            //   8b5d0c               | mov                 ebx, dword ptr [ebp + 0xc]

        $sequence_7 = { 8bf0 8975fc 85f6 0f847e010000 }
            // n = 4, score = 300
            //   8bf0                 | mov                 esi, eax
            //   8975fc               | mov                 dword ptr [ebp - 4], esi
            //   85f6                 | test                esi, esi
            //   0f847e010000         | je                  0x184

        $sequence_8 = { e8???????? 8bf8 897dfc 83fb01 7e25 8d4bfe }
            // n = 6, score = 300
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax
            //   897dfc               | mov                 dword ptr [ebp - 4], edi
            //   83fb01               | cmp                 ebx, 1
            //   7e25                 | jle                 0x27
            //   8d4bfe               | lea                 ecx, [ebx - 2]

        $sequence_9 = { 7429 83e915 741f 83e93a }
            // n = 4, score = 300
            //   7429                 | je                  0x2b
            //   83e915               | sub                 ecx, 0x15
            //   741f                 | je                  0x21
            //   83e93a               | sub                 ecx, 0x3a

    condition:
        7 of them and filesize < 98304
}
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