SYMBOLCOMMON_NAMEaka. SYNONYMS
win.medusalocker (Back to overview)

MedusaLocker

aka: AKO Ransomware, AKO Doxware, MedusaReborn

A Windows ransomware that will run certain tasks to prepare the target system for the encryption of files. MedusaLocker avoids executable files, probably to avoid rendering the targeted system unusable for paying the ransom. It uses a combination of AES and RSA-2048, and reportedly appends extensions such as .encrypted, .bomber, .boroff, .breakingbad, .locker16, .newlock, .nlocker, and .skynet.

References
2020-10-06CrowdStrikeThe Crowdstrike Intel Team
@online{team:20201006:double:bb0f240, author = {The Crowdstrike Intel Team}, title = {{Double Trouble: Ransomware with Data Leak Extortion, Part 2}}, date = {2020-10-06}, organization = {CrowdStrike}, url = {https://www.crowdstrike.com/blog/double-trouble-ransomware-data-leak-extortion-part-2/}, language = {English}, urldate = {2020-10-12} } Double Trouble: Ransomware with Data Leak Extortion, Part 2
Maze MedusaLocker REvil
2020-09-25CrowdStrikeThe Crowdstrike Intel Team
@online{team:20200925:double:fe3b093, author = {The Crowdstrike Intel Team}, title = {{Double Trouble: Ransomware with Data Leak Extortion, Part 1}}, date = {2020-09-25}, organization = {CrowdStrike}, url = {https://www.crowdstrike.com/blog/double-trouble-ransomware-data-leak-extortion-part-1/}, language = {English}, urldate = {2020-10-02} } Double Trouble: Ransomware with Data Leak Extortion, Part 1
DoppelPaymer FriedEx LockBit Maze MedusaLocker RagnarLocker REvil RobinHood SamSam WastedLocker
2020-06-03VMWare Carbon BlackBrian Baskin
@online{baskin:20200603:medusa:8d92754, author = {Brian Baskin}, title = {{Medusa Locker Ransomware}}, date = {2020-06-03}, organization = {VMWare Carbon Black}, url = {https://www.carbonblack.com/2020/06/03/tau-threat-analyis-medusa-locker-ransomware/}, language = {English}, urldate = {2020-06-04} } Medusa Locker Ransomware
MedusaLocker
2020-04-28MicrosoftMicrosoft Threat Protection Intelligence Team
@online{team:20200428:ransomware:3205f3a, author = {Microsoft Threat Protection Intelligence Team}, title = {{Ransomware groups continue to target healthcare, critical services; here’s how to reduce risk}}, date = {2020-04-28}, organization = {Microsoft}, url = {https://www.microsoft.com/security/blog/2020/04/28/ransomware-groups-continue-to-target-healthcare-critical-services-heres-how-to-reduce-risk/}, language = {English}, urldate = {2020-05-05} } Ransomware groups continue to target healthcare, critical services; here’s how to reduce risk
LockBit Mailto Maze MedusaLocker Paradise Ransomware RagnarLocker REvil RobinHood
2020-04-23Cisco TalosEdmund Brumaghin, Amit Raut
@online{brumaghin:20200423:threat:4f7f840, author = {Edmund Brumaghin and Amit Raut}, title = {{Threat Spotlight: MedusaLocker}}, date = {2020-04-23}, organization = {Cisco Talos}, url = {https://blog.talosintelligence.com/2020/04/medusalocker.html}, language = {English}, urldate = {2020-04-26} } Threat Spotlight: MedusaLocker
MedusaLocker
2020-01-17SecureworksTamada Kiyotaka, Keita Yamazaki, You Nakatsuru
@techreport{kiyotaka:20200117:is:969ff38, author = {Tamada Kiyotaka and Keita Yamazaki and You Nakatsuru}, title = {{Is It Wrong to Try to Find APT Techniques in Ransomware Attack?}}, date = {2020-01-17}, institution = {Secureworks}, url = {https://jsac.jpcert.or.jp/archive/2020/pdf/JSAC2020_1_tamada-yamazaki-nakatsuru_en.pdf}, language = {English}, urldate = {2020-04-06} } Is It Wrong to Try to Find APT Techniques in Ransomware Attack?
Defray Dharma FriedEx Gandcrab GlobeImposter Matrix Ransom MedusaLocker Phobos Ransomware REvil Ryuk SamSam Scarab Ransomware
2020-01-09ID RansomwareAndrew Ivanov
@online{ivanov:20200109:ako:79016d7, author = {Andrew Ivanov}, title = {{Ako, MedusaReborn}}, date = {2020-01-09}, organization = {ID Ransomware}, url = {https://id-ransomware.blogspot.com/2020/01/ako-ransomware.html}, language = {English}, urldate = {2020-05-18} } Ako, MedusaReborn
MedusaLocker
2020-01-09Twitter (@siri_urz)Twitter (@siri_urz)
@online{siriurz:20200109:ako:da2a708, author = {Twitter (@siri_urz)}, title = {{Tweet on AKO Ransomware}}, date = {2020-01-09}, organization = {Twitter (@siri_urz)}, url = {https://twitter.com/siri_urz/status/1215194488714346496?s=20}, language = {English}, urldate = {2020-05-18} } Tweet on AKO Ransomware
MedusaLocker
2019-11-05Dissecting MalwareMarius Genheimer
@online{genheimer:20191105:try:3aafee6, author = {Marius Genheimer}, title = {{Try not to stare - MedusaLocker at a glance}}, date = {2019-11-05}, organization = {Dissecting Malware}, url = {https://dissectingmalwa.re/try-not-to-stare-medusalocker-at-a-glance.html}, language = {English}, urldate = {2020-03-27} } Try not to stare - MedusaLocker at a glance
MedusaLocker
2019-10-15Andrew Ivanov
@online{ivanov:20191015:medusalocker:132bb68, author = {Andrew Ivanov}, title = {{MedusaLocker Ransomware}}, date = {2019-10-15}, url = {http://id-ransomware.blogspot.com/2019/10/medusalocker-ransomware.html}, language = {English}, urldate = {2020-01-07} } MedusaLocker Ransomware
MedusaLocker
Yara Rules
[TLP:WHITE] win_medusalocker_auto (20201014 | autogenerated rule brought to you by yara-signator)
rule win_medusalocker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.medusalocker"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { e8???????? 0fb6d0 85d2 7547 8b45e4 83c00c 50 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   0fb6d0               | movzx               edx, al
            //   85d2                 | test                edx, edx
            //   7547                 | jne                 0x49
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   83c00c               | add                 eax, 0xc
            //   50                   | push                eax

        $sequence_1 = { 7404 b001 eb54 6a00 6a18 6a00 6a00 }
            // n = 7, score = 300
            //   7404                 | je                  6
            //   b001                 | mov                 al, 1
            //   eb54                 | jmp                 0x56
            //   6a00                 | push                0
            //   6a18                 | push                0x18
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_2 = { 8d4dd4 e8???????? 8b4df0 c6417601 c745fcffffffff 8b45f0 8b4df4 }
            // n = 7, score = 300
            //   8d4dd4               | lea                 ecx, [ebp - 0x2c]
            //   e8????????           |                     
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   c6417601             | mov                 byte ptr [ecx + 0x76], 1
            //   c745fcffffffff       | mov                 dword ptr [ebp - 4], 0xffffffff
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]

        $sequence_3 = { 8d4de0 e8???????? 8b5004 52 8b00 50 }
            // n = 6, score = 300
            //   8d4de0               | lea                 ecx, [ebp - 0x20]
            //   e8????????           |                     
            //   8b5004               | mov                 edx, dword ptr [eax + 4]
            //   52                   | push                edx
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   50                   | push                eax

        $sequence_4 = { c745e800000000 8b4de8 894de4 c645fc02 8b55e4 }
            // n = 5, score = 300
            //   c745e800000000       | mov                 dword ptr [ebp - 0x18], 0
            //   8b4de8               | mov                 ecx, dword ptr [ebp - 0x18]
            //   894de4               | mov                 dword ptr [ebp - 0x1c], ecx
            //   c645fc02             | mov                 byte ptr [ebp - 4], 2
            //   8b55e4               | mov                 edx, dword ptr [ebp - 0x1c]

        $sequence_5 = { 8d4dec 51 e8???????? 83c408 8b5004 }
            // n = 5, score = 300
            //   8d4dec               | lea                 ecx, [ebp - 0x14]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8b5004               | mov                 edx, dword ptr [eax + 4]

        $sequence_6 = { 8b4d10 51 e8???????? 83c404 50 0fb655ff 52 }
            // n = 7, score = 300
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   50                   | push                eax
            //   0fb655ff             | movzx               edx, byte ptr [ebp - 1]
            //   52                   | push                edx

        $sequence_7 = { c745fc04000000 8b55ec 83e202 740c }
            // n = 4, score = 300
            //   c745fc04000000       | mov                 dword ptr [ebp - 4], 4
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]
            //   83e202               | and                 edx, 2
            //   740c                 | je                  0xe

        $sequence_8 = { 8b45f0 c700???????? 8b4df0 83c104 e8???????? 05c8000000 8bc8 }
            // n = 7, score = 300
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   c700????????         |                     
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   83c104               | add                 ecx, 4
            //   e8????????           |                     
            //   05c8000000           | add                 eax, 0xc8
            //   8bc8                 | mov                 ecx, eax

        $sequence_9 = { 8b4508 50 0fb64d0c 51 }
            // n = 4, score = 300
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   50                   | push                eax
            //   0fb64d0c             | movzx               ecx, byte ptr [ebp + 0xc]
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 1433600
}
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