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 (20220808 | Detects win.aurora.)
rule win_aurora_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.aurora."
        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.aurora"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 83fe04 7cdf 8b45d0 8d7bff 8b5dc8 8ad4 }
            // n = 6, score = 300
            //   83fe04               | cmp                 esi, 4
            //   7cdf                 | jl                  0xffffffe1
            //   8b45d0               | mov                 eax, dword ptr [ebp - 0x30]
            //   8d7bff               | lea                 edi, [ebx - 1]
            //   8b5dc8               | mov                 ebx, dword ptr [ebp - 0x38]
            //   8ad4                 | mov                 dl, ah

        $sequence_1 = { c745b800000000 8d3441 c645a800 8bc6 8d4da8 2bc3 }
            // n = 6, score = 300
            //   c745b800000000       | mov                 dword ptr [ebp - 0x48], 0
            //   8d3441               | lea                 esi, [ecx + eax*2]
            //   c645a800             | mov                 byte ptr [ebp - 0x58], 0
            //   8bc6                 | mov                 eax, esi
            //   8d4da8               | lea                 ecx, [ebp - 0x58]
            //   2bc3                 | sub                 eax, ebx

        $sequence_2 = { 8d8dd4efffff c785e8efffff0f000000 c785e4efffff00000000 c685d4efffff00 e8???????? }
            // n = 5, score = 300
            //   8d8dd4efffff         | lea                 ecx, [ebp - 0x102c]
            //   c785e8efffff0f000000     | mov    dword ptr [ebp - 0x1018], 0xf
            //   c785e4efffff00000000     | mov    dword ptr [ebp - 0x101c], 0
            //   c685d4efffff00       | mov                 byte ptr [ebp - 0x102c], 0
            //   e8????????           |                     

        $sequence_3 = { 8b3d???????? 8b1d???????? 660f1f440000 56 }
            // n = 4, score = 300
            //   8b3d????????         |                     
            //   8b1d????????         |                     
            //   660f1f440000         | nop                 word ptr [eax + eax]
            //   56                   | push                esi

        $sequence_4 = { c0e102 80e203 02d1 8ac4 8855cc }
            // n = 5, score = 300
            //   c0e102               | shl                 cl, 2
            //   80e203               | and                 dl, 3
            //   02d1                 | add                 dl, cl
            //   8ac4                 | mov                 al, ah
            //   8855cc               | mov                 byte ptr [ebp - 0x34], dl

        $sequence_5 = { 894df8 8b4df4 83791410 7202 8b09 2bc2 33d2 }
            // n = 7, score = 300
            //   894df8               | mov                 dword ptr [ebp - 8], ecx
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   83791410             | cmp                 dword ptr [ecx + 0x14], 0x10
            //   7202                 | jb                  4
            //   8b09                 | mov                 ecx, dword ptr [ecx]
            //   2bc2                 | sub                 eax, edx
            //   33d2                 | xor                 edx, edx

        $sequence_6 = { c785b8efffff0f000000 c785b4efffff00000000 c685a4efffff00 e8???????? 8d8dbcefffff }
            // n = 5, score = 300
            //   c785b8efffff0f000000     | mov    dword ptr [ebp - 0x1048], 0xf
            //   c785b4efffff00000000     | mov    dword ptr [ebp - 0x104c], 0
            //   c685a4efffff00       | mov                 byte ptr [ebp - 0x105c], 0
            //   e8????????           |                     
            //   8d8dbcefffff         | lea                 ecx, [ebp - 0x1044]

        $sequence_7 = { 3c2f 0f85aa000000 837f1410 7204 8b07 eb02 }
            // n = 6, score = 300
            //   3c2f                 | cmp                 al, 0x2f
            //   0f85aa000000         | jne                 0xb0
            //   837f1410             | cmp                 dword ptr [edi + 0x14], 0x10
            //   7204                 | jb                  6
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   eb02                 | jmp                 4

        $sequence_8 = { 68???????? 8d8d94f0ffff c785a8f0ffff0f000000 c785a4f0ffff00000000 c68594f0ffff00 e8???????? 8d8dacf0ffff }
            // n = 7, score = 300
            //   68????????           |                     
            //   8d8d94f0ffff         | lea                 ecx, [ebp - 0xf6c]
            //   c785a8f0ffff0f000000     | mov    dword ptr [ebp - 0xf58], 0xf
            //   c785a4f0ffff00000000     | mov    dword ptr [ebp - 0xf5c], 0
            //   c68594f0ffff00       | mov                 byte ptr [ebp - 0xf6c], 0
            //   e8????????           |                     
            //   8d8dacf0ffff         | lea                 ecx, [ebp - 0xf54]

        $sequence_9 = { 47 8d85d8feffff 50 8d8df8feffff }
            // n = 4, score = 300
            //   47                   | inc                 edi
            //   8d85d8feffff         | lea                 eax, [ebp - 0x128]
            //   50                   | push                eax
            //   8d8df8feffff         | lea                 ecx, [ebp - 0x108]

    condition:
        7 of them and filesize < 827392
}
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