SYMBOLCOMMON_NAMEaka. SYNONYMS
win.astralocker (Back to overview)

AstraLocker


There is no description at this point.

References
2022-07-07EmsisoftEmsisoft
@online{emsisoft:20220707:astralocker:4fc94a1, author = {Emsisoft}, title = {{AstraLocker decryptor}}, date = {2022-07-07}, organization = {Emsisoft}, url = {https://www.emsisoft.com/ransomware-decryption-tools/astralocker}, language = {English}, urldate = {2022-07-12} } AstraLocker decryptor
AstraLocker
2022-07-04Bleeping ComputerSergiu Gatlan
@online{gatlan:20220704:astralocker:02fcfe5, author = {Sergiu Gatlan}, title = {{AstraLocker ransomware shuts down and releases decryptors}}, date = {2022-07-04}, organization = {Bleeping Computer}, url = {https://www.bleepingcomputer.com/news/security/astralocker-ransomware-shuts-down-and-releases-decryptors/}, language = {English}, urldate = {2022-08-05} } AstraLocker ransomware shuts down and releases decryptors
AstraLocker
2022-07-01Malwarebytes LabsChristopher Boyd
@online{boyd:20220701:astralocker:7ef70a2, author = {Christopher Boyd}, title = {{AstraLocker 2.0 ransomware isn’t going to give you your files back}}, date = {2022-07-01}, organization = {Malwarebytes Labs}, url = {https://blog.malwarebytes.com/ransomware/2022/07/astralocker-2-0-ransomware-isnt-going-to-give-you-your-files-back/}, language = {English}, urldate = {2022-07-05} } AstraLocker 2.0 ransomware isn’t going to give you your files back
AstraLocker
2022-06-28Reversing LabsJoseph Edwards
@online{edwards:20220628:smashandgrab:115e907, author = {Joseph Edwards}, title = {{Smash-and-grab: AstraLocker 2.0 pushes ransomware direct from Office docs}}, date = {2022-06-28}, organization = {Reversing Labs}, url = {https://blog.reversinglabs.com/blog/smash-and-grab-astralocker-2-pushes-ransomware-direct-from-office-docs}, language = {English}, urldate = {2022-06-30} } Smash-and-grab: AstraLocker 2.0 pushes ransomware direct from Office docs
AstraLocker
Yara Rules
[TLP:WHITE] win_astralocker_auto (20221125 | Detects win.astralocker.)
rule win_astralocker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.astralocker."
        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.astralocker"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 89040a 89740a04 c745fc00000000 eb09 8b4dfc 83c102 894dfc }
            // n = 7, score = 500
            //   89040a               | mov                 dword ptr [edx + ecx], eax
            //   89740a04             | mov                 dword ptr [edx + ecx + 4], esi
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   eb09                 | jmp                 0xb
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   83c102               | add                 ecx, 2
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx

        $sequence_1 = { 8b0c0a 51 e8???????? 83c408 8945ec 8955f0 ba08000000 }
            // n = 7, score = 500
            //   8b0c0a               | mov                 ecx, dword ptr [edx + ecx]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   8955f0               | mov                 dword ptr [ebp - 0x10], edx
            //   ba08000000           | mov                 edx, 8

        $sequence_2 = { c745fc00000000 eb09 8b4dfc 83c102 894dfc }
            // n = 5, score = 500
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   eb09                 | jmp                 0xb
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   83c102               | add                 ecx, 2
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx

        $sequence_3 = { b808000000 6bc800 8b5508 8b440a04 50 8b0c0a 51 }
            // n = 7, score = 500
            //   b808000000           | mov                 eax, 8
            //   6bc800               | imul                ecx, eax, 0
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8b440a04             | mov                 eax, dword ptr [edx + ecx + 4]
            //   50                   | push                eax
            //   8b0c0a               | mov                 ecx, dword ptr [edx + ecx]
            //   51                   | push                ecx

        $sequence_4 = { 6bc800 8b5508 8b440a04 50 }
            // n = 4, score = 500
            //   6bc800               | imul                ecx, eax, 0
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8b440a04             | mov                 eax, dword ptr [edx + ecx + 4]
            //   50                   | push                eax

        $sequence_5 = { 89040a 89740a04 c745fc00000000 eb09 8b4dfc 83c102 }
            // n = 6, score = 500
            //   89040a               | mov                 dword ptr [edx + ecx], eax
            //   89740a04             | mov                 dword ptr [edx + ecx + 4], esi
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   eb09                 | jmp                 0xb
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   83c102               | add                 ecx, 2

        $sequence_6 = { 8b440a04 50 8b0c0a 51 e8???????? 83c408 }
            // n = 6, score = 500
            //   8b440a04             | mov                 eax, dword ptr [edx + ecx + 4]
            //   50                   | push                eax
            //   8b0c0a               | mov                 ecx, dword ptr [edx + ecx]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8

        $sequence_7 = { 83c102 894dfc 837dfc0a 0f83dc000000 8b55fc 8b4508 }
            // n = 6, score = 500
            //   83c102               | add                 ecx, 2
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx
            //   837dfc0a             | cmp                 dword ptr [ebp - 4], 0xa
            //   0f83dc000000         | jae                 0xe2
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]

        $sequence_8 = { 33f6 89040a 89740a04 c745fc00000000 eb09 8b4dfc }
            // n = 6, score = 500
            //   33f6                 | xor                 esi, esi
            //   89040a               | mov                 dword ptr [edx + ecx], eax
            //   89740a04             | mov                 dword ptr [edx + ecx + 4], esi
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   eb09                 | jmp                 0xb
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_9 = { 89441104 ba08000000 6bc20a 8b4d08 33d2 }
            // n = 5, score = 500
            //   89441104             | mov                 dword ptr [ecx + edx + 4], eax
            //   ba08000000           | mov                 edx, 8
            //   6bc20a               | imul                eax, edx, 0xa
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   33d2                 | xor                 edx, edx

    condition:
        7 of them and filesize < 191488
}
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