Analysis

  • max time kernel
    142s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230703-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07/07/2023, 13:55

General

  • Target
    decode_1547e0b0ed6a633c62a145f1d9d606c5a7fae8cbbdc5ce73165804f78eff335f.exe
  • Size 47KB
  • Sample230707-q74hdsaf4v
  • SHA256 76ded83d3b20de4cab65576d0e4c5adcd5b8ebb76e064ef4c2d3449ebdd25cac
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • asyncrat

Version
  • 1.0.7

Botnet
  • 6JULIO-PJOAOJS

C2
  • 20.200.63.2:2727

Mutex
  • DcRatMutex_qwqdanchun

Attributes
  • delay

    1

  • install

    false

  • install_folder

    %AppData%

aes.plain

Signatures

  • AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers written in C#.

  • Async RAT payload 1 IoCs
  • Renames multiple (385) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

  • Drops file in Program Files directory 64 IoCs
  • Delays execution with timeout.exe 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 4 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\decode_1547e0b0ed6a633c62a145f1d9d606c5a7fae8cbbdc5ce73165804f78eff335f.exe
    "C:\Users\Admin\AppData\Local\Temp\decode_1547e0b0ed6a633c62a145f1d9d606c5a7fae8cbbdc5ce73165804f78eff335f.exe"
    1⤵
    • Drops file in Program Files directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2736
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9769.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3140
      • C:\Windows\system32\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:1568

Network

        MITRE ATT&CK Matrix

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        NetworkServerControl

        • Path C:\Program Files\Java\jdk1.8.0_66\db\bin\NetworkServerControl
        • Size 5KB
        • SHA256 7a808f42100ece1de2b2990b3e0c7e79103bef8100a23194aa379c814bfbd910
        • MD5 SHA1 SHA512 SSDEEP

        tmp9769.tmp.bat

        • Path C:\Users\Admin\AppData\Local\Temp\tmp9769.tmp.bat
        • Size 223B
        • SHA256 79064ce8ab43489283d361988afc0e822f760c08b5f8b4d54db6d4eaa2d5cc3c
        • MD5 SHA1 SHA512

        memory/2736-133-0x0000000000FA0000-0x0000000000FB2000-memory.dmp

        memory/2736-134-0x000000001BCC0000-0x000000001BCD0000-memory.dmp

        memory/2736-135-0x000000001BCC0000-0x000000001BCD0000-memory.dmp

        memory/2736-136-0x000000001DAC0000-0x000000001DB36000-memory.dmp

        memory/2736-137-0x000000001BBD0000-0x000000001BBEE000-memory.dmp