SYMBOLCOMMON_NAMEaka. SYNONYMS
win.aurora (Back to overview)

Aurora

aka: OneKeyLocker

Actor(s): Oktropys


Ransomware

References
2019-01-04Bleeping ComputerLawrence Abrams
@online{abrams:20190104:how:8932d09, author = {Lawrence Abrams}, title = {{How to Decrypt the Aurora Ransomware with AuroraDecrypter}}, date = {2019-01-04}, organization = {Bleeping Computer}, url = {https://www.bleepingcomputer.com/ransomware/decryptor/how-to-decrypt-the-aurora-ransomware-with-auroradecrypter/}, language = {English}, urldate = {2019-12-17} } How to Decrypt the Aurora Ransomware with AuroraDecrypter
Aurora
2018-08-18Bleeping ComputerVishal Thakur
@online{thakur:20180818:azorult:e096002, author = {Vishal Thakur}, title = {{AZORult Trojan Serving Aurora Ransomware by MalActor Oktropys}}, date = {2018-08-18}, organization = {Bleeping Computer}, url = {https://www.bleepingcomputer.com/news/security/azorult-trojan-serving-aurora-ransomware-by-malactor-oktropys/}, language = {English}, urldate = {2019-12-20} } AZORult Trojan Serving Aurora Ransomware by MalActor Oktropys
Aurora Azorult
2018-05-29Twitter (@malwrhunterteam)MalwareHunterTeam
@online{malwarehunterteam:20180529:aurora:867bacc, author = {MalwareHunterTeam}, title = {{Tweet on Aurora / OneKeyLocker Ransomware}}, date = {2018-05-29}, organization = {Twitter (@malwrhunterteam)}, url = {https://twitter.com/malwrhunterteam/status/1001461507513880576}, language = {English}, urldate = {2020-03-02} } Tweet on Aurora / OneKeyLocker Ransomware
Aurora
Yara Rules
[TLP:WHITE] win_aurora_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_aurora_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.aurora"
        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 = { 6a04 68???????? 8d8db4f1ffff c785c8f1ffff0f000000 }
            // n = 4, score = 300
            //   6a04                 | push                4
            //   68????????           |                     
            //   8d8db4f1ffff         | lea                 ecx, [ebp - 0xe4c]
            //   c785c8f1ffff0f000000     | mov    dword ptr [ebp - 0xe38], 0xf

        $sequence_1 = { 8b45d0 0f434dc0 0f435dc0 c7458c0f000000 c7458800000000 8d3441 }
            // n = 6, score = 300
            //   8b45d0               | mov                 eax, dword ptr [ebp - 0x30]
            //   0f434dc0             | cmovae              ecx, dword ptr [ebp - 0x40]
            //   0f435dc0             | cmovae              ebx, dword ptr [ebp - 0x40]
            //   c7458c0f000000       | mov                 dword ptr [ebp - 0x74], 0xf
            //   c7458800000000       | mov                 dword ptr [ebp - 0x78], 0
            //   8d3441               | lea                 esi, [ecx + eax*2]

        $sequence_2 = { 0f57c0 83c608 660fd645e8 83ef01 0f856cffffff }
            // n = 5, score = 300
            //   0f57c0               | xorps               xmm0, xmm0
            //   83c608               | add                 esi, 8
            //   660fd645e8           | movq                qword ptr [ebp - 0x18], xmm0
            //   83ef01               | sub                 edi, 1
            //   0f856cffffff         | jne                 0xffffff72

        $sequence_3 = { 6a00 0f4345d8 8d4da8 50 }
            // n = 4, score = 300
            //   6a00                 | push                0
            //   0f4345d8             | cmovae              eax, dword ptr [ebp - 0x28]
            //   8d4da8               | lea                 ecx, [ebp - 0x58]
            //   50                   | push                eax

        $sequence_4 = { 0f45c2 50 e8???????? 8bfb }
            // n = 4, score = 300
            //   0f45c2               | cmovne              eax, edx
            //   50                   | push                eax
            //   e8????????           |                     
            //   8bfb                 | mov                 edi, ebx

        $sequence_5 = { 85ff 75da 837e1410 897e10 720d 8b06 }
            // n = 6, score = 300
            //   85ff                 | test                edi, edi
            //   75da                 | jne                 0xffffffdc
            //   837e1410             | cmp                 dword ptr [esi + 0x14], 0x10
            //   897e10               | mov                 dword ptr [esi + 0x10], edi
            //   720d                 | jb                  0xf
            //   8b06                 | mov                 eax, dword ptr [esi]

        $sequence_6 = { 68???????? c645fc01 e8???????? 8bd0 c745ec07000000 33c0 c745e800000000 }
            // n = 7, score = 300
            //   68????????           |                     
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   e8????????           |                     
            //   8bd0                 | mov                 edx, eax
            //   c745ec07000000       | mov                 dword ptr [ebp - 0x14], 7
            //   33c0                 | xor                 eax, eax
            //   c745e800000000       | mov                 dword ptr [ebp - 0x18], 0

        $sequence_7 = { e8???????? 83ec18 c745fc00000000 8bf4 8bce e8???????? c746140f000000 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   83ec18               | sub                 esp, 0x18
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   8bf4                 | mov                 esi, esp
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   c746140f000000       | mov                 dword ptr [esi + 0x14], 0xf

        $sequence_8 = { eb02 8bc3 8d3c10 0f1f8000000000 85f6 7412 0fbe07 }
            // n = 7, score = 300
            //   eb02                 | jmp                 4
            //   8bc3                 | mov                 eax, ebx
            //   8d3c10               | lea                 edi, [eax + edx]
            //   0f1f8000000000       | nop                 dword ptr [eax]
            //   85f6                 | test                esi, esi
            //   7412                 | je                  0x14
            //   0fbe07               | movsx               eax, byte ptr [edi]

        $sequence_9 = { 8bce e8???????? 8b45bc 83f810 7242 8b4da8 }
            // n = 6, score = 300
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   8b45bc               | mov                 eax, dword ptr [ebp - 0x44]
            //   83f810               | cmp                 eax, 0x10
            //   7242                 | jb                  0x44
            //   8b4da8               | mov                 ecx, dword ptr [ebp - 0x58]

    condition:
        7 of them and filesize < 827392
}
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