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Overview

overview

10

Static

static

d6b7b27e13...a9.exe

windows7_x64

10

d6b7b27e13...a9.exe

windows10_x64

10

Analysis

  • max time kernel
    141s
  • max time network
    164s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    10/07/2021, 10:37

Sharing

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General

  • Target

    d6b7b27e13700aaa7f108bf9e76473717a7a1665198e9aafcc2d2227ca11bba9.exe

  • Size

    131KB

  • MD5

    2cc630e080bb8de5faf9f5ae87f43f8b

  • SHA1

    5a385b8b4b88b6eb93b771b7fbbe190789ef396a

  • SHA256

    d6b7b27e13700aaa7f108bf9e76473717a7a1665198e9aafcc2d2227ca11bba9

  • SHA512

    901939718692e20a969887e64db581d6fed62c99026709c672edb75ebfa35ce02fa68308d70d463afbcc42a46e52ea9f7bc5ed93e5dbf3772d221064d88e11d7

Score
10/10
ryukdiscoveryransomware

Malware Config

Extracted

Path

C:\$Recycle.Bin\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = '8x0nKKx5'; $torlink = 'http://rk2zzyh63g5avvii4irkhymha3irblchdfj7prk6zwy23f6kahidkpqd.onion'; function info(){alert("INSTRUCTION:\r\n1. Download tor browser.\r\n2. Open link through tor browser: " + $torlink + "\r\n3. Fill the form, your password: "+ $password +"\r\nWe will contact you shortly.\r\nAlways send files for test decryption.");};
URLs

http://rk2zzyh63g5avvii4irkhymha3irblchdfj7prk6zwy23f6kahidkpqd.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Modifies file permissions 1 TTPs 2 IoCs
    discovery
  • Enumerates connected drives 3 TTPs 22 IoCs

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

  • Drops file in Program Files directory 64 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\d6b7b27e13700aaa7f108bf9e76473717a7a1665198e9aafcc2d2227ca11bba9.exe
    "C:\Users\Admin\AppData\Local\Temp\d6b7b27e13700aaa7f108bf9e76473717a7a1665198e9aafcc2d2227ca11bba9.exe"
    1⤵
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Suspicious use of WriteProcessMemory
    PID:816
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:1520
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:792

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • memory/816-59-0x0000000075511000-0x0000000075513000-memory.dmp

    Filesize

    8KB

    Download