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 (20201014 | autogenerated rule brought to you by yara-signator)
rule win_rockloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.rockloader"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 85ff 7452 8b4508 40 894508 56 }
            // n = 6, score = 300
            //   85ff                 | test                edi, edi
            //   7452                 | je                  0x54
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   40                   | inc                 eax
            //   894508               | mov                 dword ptr [ebp + 8], eax
            //   56                   | push                esi

        $sequence_1 = { 8b7f08 85ff 7450 8b75f8 }
            // n = 4, score = 300
            //   8b7f08               | mov                 edi, dword ptr [edi + 8]
            //   85ff                 | test                edi, edi
            //   7450                 | je                  0x52
            //   8b75f8               | mov                 esi, dword ptr [ebp - 8]

        $sequence_2 = { 8d44c1c9 eb11 80f961 7c47 80f966 7f42 0fbec9 }
            // n = 7, score = 300
            //   8d44c1c9             | lea                 eax, [ecx + eax*8 - 0x37]
            //   eb11                 | jmp                 0x13
            //   80f961               | cmp                 cl, 0x61
            //   7c47                 | jl                  0x49
            //   80f966               | cmp                 cl, 0x66
            //   7f42                 | jg                  0x44
            //   0fbec9               | movsx               ecx, cl

        $sequence_3 = { 8d4303 85f6 7407 e8???????? eb07 50 ff15???????? }
            // n = 7, score = 300
            //   8d4303               | lea                 eax, [ebx + 3]
            //   85f6                 | test                esi, esi
            //   7407                 | je                  9
            //   e8????????           |                     
            //   eb07                 | jmp                 9
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_4 = { e8???????? 33f6 2175f8 8bf8 3975f4 7e55 }
            // n = 6, score = 300
            //   e8????????           |                     
            //   33f6                 | xor                 esi, esi
            //   2175f8               | and                 dword ptr [ebp - 8], esi
            //   8bf8                 | mov                 edi, eax
            //   3975f4               | cmp                 dword ptr [ebp - 0xc], esi
            //   7e55                 | jle                 0x57

        $sequence_5 = { 46 80382d 750a dd05???????? 40 dd5de4 }
            // n = 6, score = 300
            //   46                   | inc                 esi
            //   80382d               | cmp                 byte ptr [eax], 0x2d
            //   750a                 | jne                 0xc
            //   dd05????????         |                     
            //   40                   | inc                 eax
            //   dd5de4               | fstp                qword ptr [ebp - 0x1c]

        $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 = { 8a08 3acb 7dea 0faff7 8975f8 db45f8 8365f800 }
            // n = 7, score = 300
            //   8a08                 | mov                 cl, byte ptr [eax]
            //   3acb                 | cmp                 cl, bl
            //   7dea                 | jge                 0xffffffec
            //   0faff7               | imul                esi, edi
            //   8975f8               | mov                 dword ptr [ebp - 8], esi
            //   db45f8               | fild                dword ptr [ebp - 8]
            //   8365f800             | and                 dword ptr [ebp - 8], 0

        $sequence_8 = { 83e800 743b 48 7431 48 7427 48 }
            // n = 7, score = 300
            //   83e800               | sub                 eax, 0
            //   743b                 | je                  0x3d
            //   48                   | dec                 eax
            //   7431                 | je                  0x33
            //   48                   | dec                 eax
            //   7427                 | je                  0x29
            //   48                   | dec                 eax

        $sequence_9 = { 8b45f8 8d0488 8b08 894508 }
            // n = 4, 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

    condition:
        7 of them and filesize < 98304
}
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