Analysis

  • max time kernel
    83s
  • max time network
    87s
  • platform
    windows7_x64
  • resource
    win7-20230703-en
  • resource tags

    arch:x64arch:x86image:win7-20230703-enlocale:en-usos:windows7-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 3 IoCs
  • Renames multiple (198) files with added filename extension

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

  • Deletes itself 1 IoCs
  • 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 6 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:3044
    • C:\Windows\system32\cmd.exe
      cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp5DF5.tmp.bat""
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2492
      • C:\Windows\system32\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:2428

Network

        MITRE ATT&CK Matrix

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        Cab3843.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\Cab3843.tmp
        • Size 62KB
        • SHA256 d015145d551ecd14916270efad773bbc9fd57fad2228d2c24559f696c961d904
        • MD5 SHA1 SHA512 SSDEEP

        TarE0A5.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\TarE0A5.tmp
        • Size 164KB
        • SHA256 c8733c93cc5aaf5ca206d06af22ee8dbdec764fb5085019a6a9181feb9dfdee6
        • MD5 SHA1 SHA512 SSDEEP

        tmp5DF5.tmp.bat

        • Path C:\Users\Admin\AppData\Local\Temp\tmp5DF5.tmp.bat
        • Size 223B
        • SHA256 fab604cab3e2727b6d1032605600f78dda8320539a6dfa6526ce063a56cc29de
        • MD5 SHA1 SHA512

        tmp5DF5.tmp.bat

        • Path C:\Users\Admin\AppData\Local\Temp\tmp5DF5.tmp.bat
        • Size 223B
        • SHA256 fab604cab3e2727b6d1032605600f78dda8320539a6dfa6526ce063a56cc29de
        • MD5 SHA1 SHA512

        memory/3044-54-0x0000000000D50000-0x0000000000D62000-memory.dmp

        memory/3044-55-0x000000001B1A0000-0x000000001B220000-memory.dmp

        memory/3044-72-0x000000001B1A0000-0x000000001B220000-memory.dmp

        memory/3044-73-0x00000000004F0000-0x000000000050E000-memory.dmp

        memory/3044-489-0x000000001A280000-0x000000001A2E4000-memory.dmp