SYMBOLCOMMON_NAMEaka. SYNONYMS
win.spora_ransom (Back to overview)

Spora


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References
2017-06-26SophosBill Brenner
@online{brenner:20170626:how:b5978ec, author = {Bill Brenner}, title = {{How Spora ransomware tries to fool antivirus}}, date = {2017-06-26}, organization = {Sophos}, url = {https://nakedsecurity.sophos.com/2017/06/26/how-spora-ransomware-tries-to-fool-antivirus/}, language = {English}, urldate = {2019-10-14} } How Spora ransomware tries to fool antivirus
Spora
2017-03-15Github (MinervaLabsResearch)Minerva Labs
@online{labs:20170315:vaccinating:751a95c, author = {Minerva Labs}, title = {{Vaccinating against Spora ransomware: a proof-of-concept tool by Minerva}}, date = {2017-03-15}, organization = {Github (MinervaLabsResearch)}, url = {https://github.com/MinervaLabsResearch/SporaVaccination}, language = {English}, urldate = {2019-10-23} } Vaccinating against Spora ransomware: a proof-of-concept tool by Minerva
Spora
2017-03-10MalwarebytesMalwarebytes Labs
@online{labs:20170310:explained:4186cb4, author = {Malwarebytes Labs}, title = {{Explained: Spora ransomware}}, date = {2017-03-10}, organization = {Malwarebytes}, url = {https://blog.malwarebytes.com/threat-analysis/2017/03/spora-ransomware/}, language = {English}, urldate = {2019-12-20} } Explained: Spora ransomware
Spora
2017-03-09TenableKevin Douglas
@online{douglas:20170309:spora:7038fba, author = {Kevin Douglas}, title = {{Spora Ransomware: Understanding the HTA Infection Vector}}, date = {2017-03-09}, organization = {Tenable}, url = {https://www.linkedin.com/pulse/spora-ransomware-understanding-hta-infection-vector-kevin-douglas}, language = {English}, urldate = {2020-01-10} } Spora Ransomware: Understanding the HTA Infection Vector
Spora
2017-01-18G DataKarsten Hahn
@online{hahn:20170118:spora:43d64d0, author = {Karsten Hahn}, title = {{Spora - the Shortcut Worm that is also a Ransomware}}, date = {2017-01-18}, organization = {G Data}, url = {https://www.gdatasoftware.com/blog/2017/01/29442-spora-worm-and-ransomware}, language = {English}, urldate = {2019-10-15} } Spora - the Shortcut Worm that is also a Ransomware
Spora
2017-01-17Malware Traffic AnalysisBrad Duncan
@online{duncan:20170117:eitest:f6e103b, author = {Brad Duncan}, title = {{EITEST RIG-V FROM 92.53.127.86 SENDS SPORA RANSOMWARE}}, date = {2017-01-17}, organization = {Malware Traffic Analysis}, url = {http://malware-traffic-analysis.net/2017/01/17/index2.html}, language = {English}, urldate = {2020-01-13} } EITEST RIG-V FROM 92.53.127.86 SENDS SPORA RANSOMWARE
Spora
Yara Rules
[TLP:WHITE] win_spora_ransom_auto (20211008 | Detects win.spora_ransom.)
rule win_spora_ransom_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-10-07"
        version = "1"
        description = "Detects win.spora_ransom."
        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.spora_ransom"
        malpedia_rule_date = "20211007"
        malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535"
        malpedia_version = "20211008"
        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 = { 56 6a40 ffd3 8bf8 897df4 85ff }
            // n = 6, score = 200
            //   56                   | push                esi
            //   6a40                 | push                0x40
            //   ffd3                 | call                ebx
            //   8bf8                 | mov                 edi, eax
            //   897df4               | mov                 dword ptr [ebp - 0xc], edi
            //   85ff                 | test                edi, edi

        $sequence_1 = { ff15???????? 85c0 7403 897df8 ff75fc ffd6 }
            // n = 6, score = 200
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7403                 | je                  5
            //   897df8               | mov                 dword ptr [ebp - 8], edi
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ffd6                 | call                esi

        $sequence_2 = { be00400000 56 6a40 ffd3 }
            // n = 4, score = 200
            //   be00400000           | mov                 esi, 0x4000
            //   56                   | push                esi
            //   6a40                 | push                0x40
            //   ffd3                 | call                ebx

        $sequence_3 = { 03fb 83ff0c 72ec 33ff }
            // n = 4, score = 200
            //   03fb                 | add                 edi, ebx
            //   83ff0c               | cmp                 edi, 0xc
            //   72ec                 | jb                  0xffffffee
            //   33ff                 | xor                 edi, edi

        $sequence_4 = { 85c0 7403 897df8 ff75fc ffd6 }
            // n = 5, score = 200
            //   85c0                 | test                eax, eax
            //   7403                 | je                  5
            //   897df8               | mov                 dword ptr [ebp - 8], edi
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ffd6                 | call                esi

        $sequence_5 = { d1eb 46 83fe1a 72c7 5e 5b c9 }
            // n = 7, score = 200
            //   d1eb                 | shr                 ebx, 1
            //   46                   | inc                 esi
            //   83fe1a               | cmp                 esi, 0x1a
            //   72c7                 | jb                  0xffffffc9
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   c9                   | leave               

        $sequence_6 = { ff36 ff15???????? 8d440010 50 }
            // n = 4, score = 200
            //   ff36                 | push                dword ptr [esi]
            //   ff15????????         |                     
            //   8d440010             | lea                 eax, dword ptr [eax + eax + 0x10]
            //   50                   | push                eax

        $sequence_7 = { 5e c20400 33c0 40 ebf7 53 55 }
            // n = 7, score = 200
            //   5e                   | pop                 esi
            //   c20400               | ret                 4
            //   33c0                 | xor                 eax, eax
            //   40                   | inc                 eax
            //   ebf7                 | jmp                 0xfffffff9
            //   53                   | push                ebx
            //   55                   | push                ebp

        $sequence_8 = { 741f ff36 ff15???????? 85c0 7413 0fb600 }
            // n = 6, score = 200
            //   741f                 | je                  0x21
            //   ff36                 | push                dword ptr [esi]
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7413                 | je                  0x15
            //   0fb600               | movzx               eax, byte ptr [eax]

        $sequence_9 = { 56 57 bf00020000 57 6a40 }
            // n = 5, score = 200
            //   56                   | push                esi
            //   57                   | push                edi
            //   bf00020000           | mov                 edi, 0x200
            //   57                   | push                edi
            //   6a40                 | push                0x40

    condition:
        7 of them and filesize < 73728
}
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