Analysis

  • max time kernel
    91s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220112
  • submitted
    02-03-2022 03:11

General

  • Target

    tmp.exe

  • Size

    505KB

  • MD5

    56fdac38d6004e0bc5fb2d5c961322e2

  • SHA1

    470111decd8883231c720a05eab77032e8b77250

  • SHA256

    cd2a19b6db25d50aa3413300fe5d1183a082a388e9b12d47fbb6ef765e1c819a

  • SHA512

    3c9f4534c275f09935dc38853e9733145ade98ef53cb4d6f7cd4d530d938c4e00117f995778d343285e3e2829fbceab3681e43772cff91fba7d41ba81c3a60dc

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

new1

C2

bigrussianfloppa.duckdns.org:1004

Mutex

a8db07ed-e16a-4405-a04c-3980d567bfdb

Attributes
  • encryption_key

    49FAF85C97BB43AF1E641011D48AB0EBC58C478E

  • install_name

    java.exe

  • log_directory

    logz

  • reconnect_delay

    300

  • startup_key

    Java

  • subdirectory

    JavaTools

Signatures

  • Quasar Payload 3 IoCs
  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\tmp.exe
    "C:\Users\Admin\AppData\Local\Temp\tmp.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3992
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Java" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\tmp.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:1084
    • C:\Users\Admin\AppData\Roaming\JavaTools\java.exe
      "C:\Users\Admin\AppData\Roaming\JavaTools\java.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:3908
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Java" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\JavaTools\java.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:2944

Network

MITRE ATT&CK Matrix ATT&CK v6

Execution

Scheduled Task

1
T1053

Persistence

Scheduled Task

1
T1053

Privilege Escalation

Scheduled Task

1
T1053

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Roaming\JavaTools\java.exe
    MD5

    56fdac38d6004e0bc5fb2d5c961322e2

    SHA1

    470111decd8883231c720a05eab77032e8b77250

    SHA256

    cd2a19b6db25d50aa3413300fe5d1183a082a388e9b12d47fbb6ef765e1c819a

    SHA512

    3c9f4534c275f09935dc38853e9733145ade98ef53cb4d6f7cd4d530d938c4e00117f995778d343285e3e2829fbceab3681e43772cff91fba7d41ba81c3a60dc

  • C:\Users\Admin\AppData\Roaming\JavaTools\java.exe
    MD5

    56fdac38d6004e0bc5fb2d5c961322e2

    SHA1

    470111decd8883231c720a05eab77032e8b77250

    SHA256

    cd2a19b6db25d50aa3413300fe5d1183a082a388e9b12d47fbb6ef765e1c819a

    SHA512

    3c9f4534c275f09935dc38853e9733145ade98ef53cb4d6f7cd4d530d938c4e00117f995778d343285e3e2829fbceab3681e43772cff91fba7d41ba81c3a60dc

  • memory/3908-135-0x00007FFA6A453000-0x00007FFA6A455000-memory.dmp
    Filesize

    8KB

  • memory/3908-136-0x000000001B260000-0x000000001B262000-memory.dmp
    Filesize

    8KB

  • memory/3908-137-0x00000000025D0000-0x0000000002620000-memory.dmp
    Filesize

    320KB

  • memory/3908-138-0x000000001B970000-0x000000001BA22000-memory.dmp
    Filesize

    712KB

  • memory/3992-130-0x0000000000E70000-0x0000000000EF4000-memory.dmp
    Filesize

    528KB

  • memory/3992-131-0x00007FFA6A453000-0x00007FFA6A455000-memory.dmp
    Filesize

    8KB

  • memory/3992-132-0x000000001BC70000-0x000000001BC72000-memory.dmp
    Filesize

    8KB