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 (20201023 | autogenerated rule brought to you by yara-signator)
rule win_rockloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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 = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 894810 c7400c04000000 8bc7 5e 5f c9 }
            // n = 6, score = 300
            //   894810               | mov                 dword ptr [eax + 0x10], ecx
            //   c7400c04000000       | mov                 dword ptr [eax + 0xc], 4
            //   8bc7                 | mov                 eax, edi
            //   5e                   | pop                 esi
            //   5f                   | pop                 edi
            //   c9                   | leave               

        $sequence_1 = { 40 50 57 e8???????? 8906 83c604 85c0 }
            // n = 7, score = 300
            //   40                   | inc                 eax
            //   50                   | push                eax
            //   57                   | push                edi
            //   e8????????           |                     
            //   8906                 | mov                 dword ptr [esi], eax
            //   83c604               | add                 esi, 4
            //   85c0                 | test                eax, eax

        $sequence_2 = { 85f6 752c 33f6 3975f4 }
            // n = 4, score = 300
            //   85f6                 | test                esi, esi
            //   752c                 | jne                 0x2e
            //   33f6                 | xor                 esi, esi
            //   3975f4               | cmp                 dword ptr [ebp - 0xc], esi

        $sequence_3 = { c60622 e8???????? 8d041f 66c7002200 59 }
            // n = 5, score = 300
            //   c60622               | mov                 byte ptr [esi], 0x22
            //   e8????????           |                     
            //   8d041f               | lea                 eax, [edi + ebx]
            //   66c7002200           | mov                 word ptr [eax], 0x22
            //   59                   | pop                 ecx

        $sequence_4 = { 8d85a0f7ffff 50 56 c745ece8030000 }
            // n = 4, score = 300
            //   8d85a0f7ffff         | lea                 eax, [ebp - 0x860]
            //   50                   | push                eax
            //   56                   | push                esi
            //   c745ece8030000       | mov                 dword ptr [ebp - 0x14], 0x3e8

        $sequence_5 = { ddd8 8a08 ddd8 80f965 7405 }
            // n = 5, score = 300
            //   ddd8                 | fstp                st(0)
            //   8a08                 | mov                 cl, byte ptr [eax]
            //   ddd8                 | fstp                st(0)
            //   80f965               | cmp                 cl, 0x65
            //   7405                 | je                  7

        $sequence_6 = { 7c0e 80f939 7f09 0fbec9 8d44c1d0 eb24 }
            // n = 6, score = 300
            //   7c0e                 | jl                  0x10
            //   80f939               | cmp                 cl, 0x39
            //   7f09                 | jg                  0xb
            //   0fbec9               | movsx               ecx, cl
            //   8d44c1d0             | lea                 eax, [ecx + eax*8 - 0x30]
            //   eb24                 | jmp                 0x26

        $sequence_7 = { 8d4bfe d1e9 41 8a4601 8a16 80e20f }
            // n = 6, score = 300
            //   8d4bfe               | lea                 ecx, [ebx - 2]
            //   d1e9                 | shr                 ecx, 1
            //   41                   | inc                 ecx
            //   8a4601               | mov                 al, byte ptr [esi + 1]
            //   8a16                 | mov                 dl, byte ptr [esi]
            //   80e20f               | and                 dl, 0xf

        $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 = { 3c30 7c04 3c39 7e2a 3c5b 750c 8b4d08 }
            // n = 7, score = 300
            //   3c30                 | cmp                 al, 0x30
            //   7c04                 | jl                  6
            //   3c39                 | cmp                 al, 0x39
            //   7e2a                 | jle                 0x2c
            //   3c5b                 | cmp                 al, 0x5b
            //   750c                 | jne                 0xe
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]

    condition:
        7 of them and filesize < 98304
}
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