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 (20230125 | Detects win.aurora.)
rule win_aurora_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 8bda 8bf9 897dec c745f000000000 c7471000000000 c7471400000000 }
            // n = 6, score = 300
            //   8bda                 | mov                 ebx, edx
            //   8bf9                 | mov                 edi, ecx
            //   897dec               | mov                 dword ptr [ebp - 0x14], edi
            //   c745f000000000       | mov                 dword ptr [ebp - 0x10], 0
            //   c7471000000000       | mov                 dword ptr [edi + 0x10], 0
            //   c7471400000000       | mov                 dword ptr [edi + 0x14], 0

        $sequence_1 = { 8b9df0feffff c745e40f000000 c745e000000000 c645d000 803b00 }
            // n = 5, score = 300
            //   8b9df0feffff         | mov                 ebx, dword ptr [ebp - 0x110]
            //   c745e40f000000       | mov                 dword ptr [ebp - 0x1c], 0xf
            //   c745e000000000       | mov                 dword ptr [ebp - 0x20], 0
            //   c645d000             | mov                 byte ptr [ebp - 0x30], 0
            //   803b00               | cmp                 byte ptr [ebx], 0

        $sequence_2 = { 6a00 50 8bf2 e8???????? 68???????? }
            // n = 5, score = 300
            //   6a00                 | push                0
            //   50                   | push                eax
            //   8bf2                 | mov                 esi, edx
            //   e8????????           |                     
            //   68????????           |                     

        $sequence_3 = { 8bcf 803c113d 0f84da000000 83f810 7204 8b07 eb02 }
            // n = 7, score = 300
            //   8bcf                 | mov                 ecx, edi
            //   803c113d             | cmp                 byte ptr [ecx + edx], 0x3d
            //   0f84da000000         | je                  0xe0
            //   83f810               | cmp                 eax, 0x10
            //   7204                 | jb                  6
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   eb02                 | jmp                 4

        $sequence_4 = { 68???????? c745fc00000000 e8???????? 8bd0 c745d407000000 }
            // n = 5, score = 300
            //   68????????           |                     
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   e8????????           |                     
            //   8bd0                 | mov                 edx, eax
            //   c745d407000000       | mov                 dword ptr [ebp - 0x2c], 7

        $sequence_5 = { 7412 90 0fb60439 41 }
            // n = 4, score = 300
            //   7412                 | je                  0x14
            //   90                   | nop                 
            //   0fb60439             | movzx               eax, byte ptr [ecx + edi]
            //   41                   | inc                 ecx

        $sequence_6 = { 64a300000000 8bfa 897db8 8bf1 8975c8 8975c0 }
            // n = 6, score = 300
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   8bfa                 | mov                 edi, edx
            //   897db8               | mov                 dword ptr [ebp - 0x48], edi
            //   8bf1                 | mov                 esi, ecx
            //   8975c8               | mov                 dword ptr [ebp - 0x38], esi
            //   8975c0               | mov                 dword ptr [ebp - 0x40], esi

        $sequence_7 = { 8b09 2bc2 33d2 03c7 f7f7 8b7df8 8a043a }
            // n = 7, score = 300
            //   8b09                 | mov                 ecx, dword ptr [ecx]
            //   2bc2                 | sub                 eax, edx
            //   33d2                 | xor                 edx, edx
            //   03c7                 | add                 eax, edi
            //   f7f7                 | div                 edi
            //   8b7df8               | mov                 edi, dword ptr [ebp - 8]
            //   8a043a               | mov                 al, byte ptr [edx + edi]

        $sequence_8 = { 68???????? 8d8d24f1ffff c78538f1ffff0f000000 c78534f1ffff00000000 }
            // n = 4, score = 300
            //   68????????           |                     
            //   8d8d24f1ffff         | lea                 ecx, [ebp - 0xedc]
            //   c78538f1ffff0f000000     | mov    dword ptr [ebp - 0xec8], 0xf
            //   c78534f1ffff00000000     | mov    dword ptr [ebp - 0xecc], 0

        $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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