SYMBOLCOMMON_NAMEaka. SYNONYMS
win.vegalocker (Back to overview)

VegaLocker

aka: Buran, Vega

Delphi-based ransomware.

References
2019-11-05McAfeeAlexandre Mundo, Marc Rivero López
@online{mundo:20191105:buran:4c6f9f5, author = {Alexandre Mundo and Marc Rivero López}, title = {{Buran Ransomware; the Evolution of VegaLocker}}, date = {2019-11-05}, organization = {McAfee}, url = {https://www.mcafee.com/blogs/other-blogs/mcafee-labs/buran-ransomware-the-evolution-of-vegalocker/}, language = {English}, urldate = {2020-08-30} } Buran Ransomware; the Evolution of VegaLocker
VegaLocker
2019-02-11Twitter (@malwrhunterteam)malwrhunterteam
@online{malwrhunterteam:20190211:vegalocker:2828b6f, author = {malwrhunterteam}, title = {{Tweet on VegaLocker}}, date = {2019-02-11}, organization = {Twitter (@malwrhunterteam)}, url = {https://twitter.com/malwrhunterteam/status/1095024267459284992}, language = {English}, urldate = {2020-01-08} } Tweet on VegaLocker
VegaLocker
2019-02-06Twitter (@malwrhunterteam)MalwareHunterTeam
@online{malwarehunterteam:20190206:ransomware:af1a446, author = {MalwareHunterTeam}, title = {{Tweet on Ransomware Sample}}, date = {2019-02-06}, organization = {Twitter (@malwrhunterteam)}, url = {https://twitter.com/malwrhunterteam/status/1093136163836174339}, language = {English}, urldate = {2020-01-13} } Tweet on Ransomware Sample
VegaLocker
Yara Rules
[TLP:WHITE] win_vegalocker_auto (20200817 | autogenerated rule brought to you by yara-signator)
rule win_vegalocker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-08-17"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.vegalocker"
        malpedia_rule_date = "20200817"
        malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5"
        malpedia_version = "20200817"
        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 / approach 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 = { ba???????? e8???????? 7414 b954010000 ba???????? }
            // n = 5, score = 200
            //   ba????????           |                     
            //   e8????????           |                     
            //   7414                 | je                  0x16
            //   b954010000           | mov                 ecx, 0x154
            //   ba????????           |                     

        $sequence_1 = { 8d5598 b8???????? e8???????? 8b4598 ba???????? e8???????? 7414 }
            // n = 7, score = 200
            //   8d5598               | lea                 edx, [ebp - 0x68]
            //   b8????????           |                     
            //   e8????????           |                     
            //   8b4598               | mov                 eax, dword ptr [ebp - 0x68]
            //   ba????????           |                     
            //   e8????????           |                     
            //   7414                 | je                  0x16

        $sequence_2 = { 648920 8d45fc e8???????? 8b15???????? 8b45fc e8???????? 68f4010000 }
            // n = 7, score = 200
            //   648920               | mov                 dword ptr fs:[eax], esp
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   e8????????           |                     
            //   8b15????????         |                     
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   e8????????           |                     
            //   68f4010000           | push                0x1f4

        $sequence_3 = { 8bde 6681e3ffff 33c0 5a 59 59 648910 }
            // n = 7, score = 200
            //   8bde                 | mov                 ebx, esi
            //   6681e3ffff           | and                 bx, 0xffff
            //   33c0                 | xor                 eax, eax
            //   5a                   | pop                 edx
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   648910               | mov                 dword ptr fs:[eax], edx

        $sequence_4 = { 8d55f8 b8???????? e8???????? 8b45f8 ba???????? e8???????? 7414 }
            // n = 7, score = 200
            //   8d55f8               | lea                 edx, [ebp - 8]
            //   b8????????           |                     
            //   e8????????           |                     
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   ba????????           |                     
            //   e8????????           |                     
            //   7414                 | je                  0x16

        $sequence_5 = { e8???????? 85c0 7f09 8bc6 e8???????? eb23 8bd6 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7f09                 | jg                  0xb
            //   8bc6                 | mov                 eax, esi
            //   e8????????           |                     
            //   eb23                 | jmp                 0x25
            //   8bd6                 | mov                 edx, esi

        $sequence_6 = { 8b45f4 e8???????? 837df000 742c 8d55e8 }
            // n = 5, score = 200
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   e8????????           |                     
            //   837df000             | cmp                 dword ptr [ebp - 0x10], 0
            //   742c                 | je                  0x2e
            //   8d55e8               | lea                 edx, [ebp - 0x18]

        $sequence_7 = { 8bee 8bdd 85db 7405 83eb04 8b1b 8bc6 }
            // n = 7, score = 200
            //   8bee                 | mov                 ebp, esi
            //   8bdd                 | mov                 ebx, ebp
            //   85db                 | test                ebx, ebx
            //   7405                 | je                  7
            //   83eb04               | sub                 ebx, 4
            //   8b1b                 | mov                 ebx, dword ptr [ebx]
            //   8bc6                 | mov                 eax, esi

        $sequence_8 = { 8bfa 8bf0 8bee 8bdd }
            // n = 4, score = 200
            //   8bfa                 | mov                 edi, edx
            //   8bf0                 | mov                 esi, eax
            //   8bee                 | mov                 ebp, esi
            //   8bdd                 | mov                 ebx, ebp

        $sequence_9 = { e8???????? 8d55c0 8bcf e8???????? 8d45b0 50 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   8d55c0               | lea                 edx, [ebp - 0x40]
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   8d45b0               | lea                 eax, [ebp - 0x50]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 876544
}
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