Overview

overview

10

Static

static

10

revil_kasaya.exe

windows7_x64

1

revil_kasaya.exe

windows10_x64

10

Resubmissions

06-07-2021 11:37

210706-p53qbr7qe2 10

05-07-2021 18:31

210705-amslxqt9ea 10

04-07-2021 17:07

210704-587ycgna36 10

04-07-2021 16:29

210704-d622hysdcx 10

03-07-2021 14:55

210703-cggr9ffskx 10

Analysis

  • max time kernel
    19s
  • max time network
    21s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    04-07-2021 16:29

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General

  • Target

    revil_kasaya.exe

  • Size

    136KB

  • MD5

    94d087166651c0020a9e6cc2fdacdc0c

  • SHA1

    99be22569ba9b1e49d3fd36f65faa6795672fcc0

  • SHA256

    9b11711efed24b3c6723521a7d7eb4a52e4914db7420e278aa36e727459d59dd

  • SHA512

    0f5a413e57e4cedf0a8df3b33cda3c2c0732ded58c367633e8677bf88786eb786b85c97420fda150fecb68db74dc00f77064c3ea77d00f53904413c9ea3a93ba

Score
10/10
evasionransomware

Malware Config

Extracted

Path

C:\79f61-readme.txt

Ransom Note
---=== Welcome. Again. ===--- [-] Whats HapPen? [-] Your files are encrypted, and currently unavailable. You can check it: all files on your system has extension 79f61. By the way, everything is possible to recover (restore), but you need to follow our instructions. Otherwise, you cant return your data (NEVER). [+] What guarantees? [+] Its just a business. We absolutely do not care about you and your deals, except getting benefits. If we do not do our work and liabilities - nobody will not cooperate with us. Its not in our interests. To check the ability of returning files, You should go to our website. There you can decrypt one file for free. That is our guarantee. If you will not cooperate with our service - for us, its does not matter. But you will lose your time and data, cause just we have the private key. In practice - time is much more valuable than money. [+] How to get access on website? [+] You have two ways: 1) [Recommended] Using a TOR browser! a) Download and install TOR browser from this site: https://torproject.org/ b) Open our website: http://aplebzu47wgazapdqks6vrcv6zcnjppkbxbr6wketf56nf6aq2nmyoyd.onion/731FD902B6FACA31 2) If TOR blocked in your country, try to use VPN! But you can use our secondary website. For this: a) Open your any browser (Chrome, Firefox, Opera, IE, Edge) b) Open our secondary website: http://decoder.re/731FD902B6FACA31 Warning: secondary website can be blocked, thats why first variant much better and more available. When you open our website, put the following data in the input form: Key: Xqt55MRO0t/k9sbDO9DF+Oo9my9fU6PBRRLTHMED0WqJII71d/zdySp/ekUPk95w 4foH93oK/HEPR9P3E1I73c11NrCB9sWlQeRTeYVStSuCH3XhimAPDQyJ2n7+Nret xMwNXVABByFyrSGyOpxCk45N1nRMwoR/1luxKY3MqZdwde9qt+fBIS5VmDHAwVbJ B66LvM5ugf/C20SqajQVl6PFX13oqmabap6jz8v6jN62eVkNKjCC+6AeyF/1TDAQ 8D1O4eQeq618IrCQBZdk7IsSh2BkkttDNH4aLVatn2PdH54ZKzrwzKIhn1aGgIt4 Ij9TtHA4CQ6nsz/UHf7iYurHOOVPFEbj0z2B7kg79S900ZqEG7IykWgCwn1hAtVy NQW6BW8vmAxFH3mBSIbkOJYZOktGc+MfT+E1qShyykaJxQ2hfSeRC/FigBxDel5W /MLJJxvdpaKwJlS476y3qCRdUq4YbyMsw2bkNNocaF+Z172+DET8fNoqKxlPY42K sAdeDQvIYceCYNuSBc5GKf6z7IIQnOjM2KiDnY7g6uJCI2X8rWM4JGLZgFEqOXA7 gSRowFQdk2iaRtCI0V8r2isfPAlvGkUii5UzusOsBTqIb3GRmlpIL8hfq97J1+Le MirbHMnLzS4249SdwyVCHXWeb/1jb/hJ5Lc3HVl7Y8G67u7nvDgBrfMFcL9zfj/5 dgLUFTS5JJyiXvdt06dEWbH5XCM4EJoeeVp6U5WmMGW47kZY4kbsJUV9ZgwUG3on Y/dG8zUmut4MznFbH2CmZYDbz1kDbxYf1zlRtLujv/5a6lFhFmYFmimHxZ+UGWu6 jtDIn54EnpVfugggdx+TAZsU2JWrC3hkgPbDSoK3VewmCkk7Fn1ZBLeb9arAm2Qb eLD4YzRgtu6mzxPqkWfs1+WdxuDiTAlLNPnCJWP7SKttyj4AHB4yiHVYg6aIYAUb GIV/xGS2fQ+dZku48rgNY4osQbJFbsCrEiLfA2wexj5OVwG2CbQ0A7IejAJBx350 CKth3gesYt/WdjXXjLmRoEwUuiLf2yHbliDD+uZIui24KiM8FWV85fGoIyOZTKzo zV+YaGWtLg0WkVSQbzdwQ2if9o6uA0k4sCnHAWTCHAt9+Ys15kqsLz3a7M1oHWFy muuWrNmZCdl6SRo9GKkUzdw3Mp51HqH8kjiCm3qHK9OUVe0PKIROSOOayILMTEQu tdXuFVjHntreF6mctJTNoCryPB1xDb+SoU69Bsxd/DZyDSb06oPRcXnr2kjl8rxT IWBWbA== ----------------------------------------------------------------------------------------- !!! DANGER !!! DON'T try to change files by yourself, DON'T use any third party software for restoring your data or antivirus solutions - its may entail damage of the private key and, as result, The Loss all data. !!! !!! !!! ONE MORE TIME: Its in your interests to get your files back. From our side, we (the best specialists) make everything for restoring, but please should not interfere. !!! !!! !!!
URLs

http://aplebzu47wgazapdqks6vrcv6zcnjppkbxbr6wketf56nf6aq2nmyoyd.onion/731FD902B6FACA31

http://decoder.re/731FD902B6FACA31

Signatures

  • Modifies Windows Firewall 1 TTPs
    evasion
  • Modifies extensions of user files 14 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • Enumerates connected drives 3 TTPs 25 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Sets desktop wallpaper using registry 2 TTPs 1 IoCs
    ransomware
  • Drops file in Program Files directory 37 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of WriteProcessMemory 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\revil_kasaya.exe
    "C:\Users\Admin\AppData\Local\Temp\revil_kasaya.exe"
    1⤵
    • Modifies extensions of user files
    • Enumerates connected drives
    • Sets desktop wallpaper using registry
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:664
    • C:\Windows\SysWOW64\netsh.exe
      netsh advfirewall firewall set rule group="Network Discovery" new enable=Yes
      2⤵
        PID:508
    • C:\Windows\system32\wbem\unsecapp.exe
      C:\Windows\system32\wbem\unsecapp.exe -Embedding
      1⤵
        PID:2388
      • C:\Windows\system32\vssvc.exe
        C:\Windows\system32\vssvc.exe
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:628

      Network

      MITRE ATT&CK Matrix ATT&CK v6

      Initial Access

      Execution

      Persistence

      Modify Existing Service

      1
      T1031

      Privilege Escalation

      Defense Evasion

      Modify Registry

      1
      T1112

      Credential Access

      Discovery

      Query Registry

      1
      T1012

      Peripheral Device Discovery

      1
      T1120

      System Information Discovery

      2
      T1082

      Lateral Movement

      Collection

      Exfiltration

      Command and Control

      Impact

      Defacement

      1
      T1491

      Replay Monitor

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      Downloads

      • memory/508-114-0x0000000000000000-mapping.dmp
        Download