Analysis

  • max time kernel
    64s
  • max time network
    137s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    23/01/2023, 18:46

General

  • Target

    BF45D2F0B91865FC40060820980C9CF3A02C0CD42788B.exe

  • Size

    502KB

  • MD5

    25143aaeca811f4e42df904f96d6fc03

  • SHA1

    2970f0d3a80dfcb65e39f6e015034e83e6476bd4

  • SHA256

    bf45d2f0b91865fc40060820980c9cf3a02c0cd42788bc954c8a84a81111d42c

  • SHA512

    06526d154a406700b4e57142bb4d51db33e7600e05e13b83f0059babc6e867ae8b2a5616ca7cf5fbb564f49304eda0d5bf7c5f89d30a7ea3998dcb2045aa21a3

  • SSDEEP

    6144:0TEgdc0YkXAGbgiIN2RSBEnk6mHnUC/5Etqv+yw42UcEtOb8F9fML3d9yfDcTR3i:0TEgdfYubg4k6qu4mywodp+Dmcdi

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

C2

77.83.242.206:4782

Mutex

b50e3441-70f1-40ac-96af-dfb81f08fe1b

Attributes
  • encryption_key

    34EAA505D1DB50EE025558A72F9F26647208F015

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 3 IoCs
  • 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.

  • Drops file in System32 directory 5 IoCs
  • 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\BF45D2F0B91865FC40060820980C9CF3A02C0CD42788B.exe
    "C:\Users\Admin\AppData\Local\Temp\BF45D2F0B91865FC40060820980C9CF3A02C0CD42788B.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4912
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\BF45D2F0B91865FC40060820980C9CF3A02C0CD42788B.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:4812
    • C:\Windows\system32\SubDir\Client.exe
      "C:\Windows\system32\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1396
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:4272

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Windows\System32\SubDir\Client.exe

    Filesize

    502KB

    MD5

    25143aaeca811f4e42df904f96d6fc03

    SHA1

    2970f0d3a80dfcb65e39f6e015034e83e6476bd4

    SHA256

    bf45d2f0b91865fc40060820980c9cf3a02c0cd42788bc954c8a84a81111d42c

    SHA512

    06526d154a406700b4e57142bb4d51db33e7600e05e13b83f0059babc6e867ae8b2a5616ca7cf5fbb564f49304eda0d5bf7c5f89d30a7ea3998dcb2045aa21a3

  • C:\Windows\system32\SubDir\Client.exe

    Filesize

    502KB

    MD5

    25143aaeca811f4e42df904f96d6fc03

    SHA1

    2970f0d3a80dfcb65e39f6e015034e83e6476bd4

    SHA256

    bf45d2f0b91865fc40060820980c9cf3a02c0cd42788bc954c8a84a81111d42c

    SHA512

    06526d154a406700b4e57142bb4d51db33e7600e05e13b83f0059babc6e867ae8b2a5616ca7cf5fbb564f49304eda0d5bf7c5f89d30a7ea3998dcb2045aa21a3

  • memory/1396-139-0x00007FF80F660000-0x00007FF810121000-memory.dmp

    Filesize

    10.8MB

  • memory/1396-141-0x000000001C910000-0x000000001C960000-memory.dmp

    Filesize

    320KB

  • memory/1396-142-0x000000001CA20000-0x000000001CAD2000-memory.dmp

    Filesize

    712KB

  • memory/1396-143-0x00007FF80F660000-0x00007FF810121000-memory.dmp

    Filesize

    10.8MB

  • memory/4912-132-0x0000000000C40000-0x0000000000CC4000-memory.dmp

    Filesize

    528KB

  • memory/4912-133-0x00007FF80F660000-0x00007FF810121000-memory.dmp

    Filesize

    10.8MB

  • memory/4912-138-0x00007FF80F660000-0x00007FF810121000-memory.dmp

    Filesize

    10.8MB