Overview

overview

10

Static

static

3

Bygay Ultimatum.exe

windows7-x64

10

Bygay Ultimatum.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    47s
  • max time network
    47s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22-05-2024 20:07

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General

  • Target

    Bygay Ultimatum.exe

  • Size

    111KB

  • MD5

    69a08abd99af2c0de3ddae4f041579e2

  • SHA1

    de04d6d17aea96d673f0ded3cb5731d4b62b97bc

  • SHA256

    34ddc970cca5e3a8646c6355d21d74c3c6405871f14306740b420395c3df65a7

  • SHA512

    bd1244e34d6fa7fa080e272fe5371e6f1318a90b864da18aff14b999496fc64d1bb9a4573d6ce749f20cda631a05f64bdbdb86c100840cb1171eedaa29947b25

  • SSDEEP

    3072:p1HXoZq4xFSz8BIVJ91frkQIi/URe8642ZCUeFQ:fXSq4HSz8BIwBi/UM86xleF

Score
10/10
asyncratdefaultrat

Malware Config

Extracted

Family

asyncrat

Botnet

Default

C2

polaris1314-38723.portmap.host:38723

Attributes
  • delay

    1

  • install

    true

  • install_file

    svchost.exe

  • install_folder

    %Temp%

aes.plain

Signatures

  • AsyncRat

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

    ratasyncrat
  • Async RAT payload 1 IoCs
    rat
  • Checks computer location settings 2 TTPs 2 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

    persistence
  • Delays execution with timeout.exe 1 IoCs
    evasion
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

    persistence

Processes

  • C:\Users\Admin\AppData\Local\Temp\Bygay Ultimatum.exe
    "C:\Users\Admin\AppData\Local\Temp\Bygay Ultimatum.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2580
    • C:\Users\Admin\AppData\Local\Temp\Bygay Ultimate.exe
      "C:\Users\Admin\AppData\Local\Temp\Bygay Ultimate.exe"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4480
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Local\Temp\svchost.exe"' & exit
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1208
        • C:\Windows\system32\schtasks.exe
          schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Local\Temp\svchost.exe"'
          4⤵
          • Creates scheduled task(s)
          PID:2408
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp49EA.tmp.bat""
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1108
        • C:\Windows\system32\timeout.exe
          timeout 3
          4⤵
          • Delays execution with timeout.exe
          PID:3400
        • C:\Users\Admin\AppData\Local\Temp\svchost.exe
          "C:\Users\Admin\AppData\Local\Temp\svchost.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2180

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\Bygay Ultimate.exe
    Filesize

    67KB

    MD5

    94bbbe48c09379faa010ac277482e08f

    SHA1

    4e291be001c08a57a94e26f35ed5312408666904

    SHA256

    1c11f8605d446170a2f078188dc1738974cc4cf85b26d6866eda542cf5af960c

    SHA512

    d6272d89782a396475cb3f990906855f968fdffbe61b08e4c278670ea69c3f0481a929efed2ac5b35c22b4e7a83b1b9d0526341f853d933f3cb7b78162905085

    Download Submit
  • C:\Users\Admin\AppData\Local\Temp\tmp49EA.tmp.bat
    Filesize

    154B

    MD5

    1260762649e4318a9e2bdd6cba9b68c6

    SHA1

    e56305768cbdb96811380b69f1c9cba893be3f0b

    SHA256

    aa797cc32cf936b8e51a385a0998d21d5e6233e60f18dd18e7c50bd4670e079a

    SHA512

    4dfc801b5a78bd71d3ed5ddb1eb2235bcdc89bc69c66ea959d280be276440eb0879e1ec2b097c46489ac8a408d43555bd84566e3b1351a18e46d9cc02129879f

    Download Submit
  • memory/2580-0-0x00007FFBFBB53000-0x00007FFBFBB55000-memory.dmp
    Filesize

    8KB

    Download
  • memory/2580-1-0x0000000000E70000-0x0000000000E92000-memory.dmp
    Filesize

    136KB

    Download
  • memory/4480-14-0x00000000004C0000-0x00000000004D6000-memory.dmp
    Filesize

    88KB

    Download
  • memory/4480-15-0x00007FFBFBB50000-0x00007FFBFC611000-memory.dmp
    Filesize

    10.8MB

    Download
  • memory/4480-16-0x00007FFBFBB50000-0x00007FFBFC611000-memory.dmp
    Filesize

    10.8MB

    Download
  • memory/4480-19-0x00007FFBFBB50000-0x00007FFBFC611000-memory.dmp
    Filesize

    10.8MB

    Download
  • memory/4480-22-0x00007FFBFBB50000-0x00007FFBFC611000-memory.dmp
    Filesize

    10.8MB

    Download