Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28/12/2022, 23:02

General

  • Target

    Shut.exe

  • Size

    502KB

  • MD5

    225bee869cfc364982f132a8b9320f1e

  • SHA1

    3d13fdd4c3781a3fe0b279f5480b88150cdc1ada

  • SHA256

    fc6402f6df918d0307ea6e033afebf90fde69ca6b74dc6af4d97423d00518c45

  • SHA512

    e17a17f41d57dbf28fa775926e2085e19b5583c5399b2e5d36466c0d4ee70bf2eb3d3c2ae079995bcf1eee5e9c3aaa0c84fbf462dd0d8c6e5591ae2a1210a871

  • SSDEEP

    6144:RTEgdc0YrXAGbgiIN2RSB3d1dcKlh/z+055QBcEivb8F9ftEnq9YcTR3L:RTEgdfYbbg7d575Qys7E1cdL

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

C2

193.149.176.156:8080

Mutex

e51896b4-9928-4edd-8f19-3d5855d3388f

Attributes
  • encryption_key

    936C784DF6BFBCB86D89EDF1DA8425E6D70DCFBB

  • install_name

    explorer.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Defender

  • subdirectory

    D3SD

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\Shut.exe
    "C:\Users\Admin\AppData\Local\Temp\Shut.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1524
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Shut.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:1992
    • C:\Windows\system32\D3SD\explorer.exe
      "C:\Windows\system32\D3SD\explorer.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4124
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Windows\system32\D3SD\explorer.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:4948

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Windows\System32\D3SD\explorer.exe

    Filesize

    502KB

    MD5

    225bee869cfc364982f132a8b9320f1e

    SHA1

    3d13fdd4c3781a3fe0b279f5480b88150cdc1ada

    SHA256

    fc6402f6df918d0307ea6e033afebf90fde69ca6b74dc6af4d97423d00518c45

    SHA512

    e17a17f41d57dbf28fa775926e2085e19b5583c5399b2e5d36466c0d4ee70bf2eb3d3c2ae079995bcf1eee5e9c3aaa0c84fbf462dd0d8c6e5591ae2a1210a871

  • C:\Windows\system32\D3SD\explorer.exe

    Filesize

    502KB

    MD5

    225bee869cfc364982f132a8b9320f1e

    SHA1

    3d13fdd4c3781a3fe0b279f5480b88150cdc1ada

    SHA256

    fc6402f6df918d0307ea6e033afebf90fde69ca6b74dc6af4d97423d00518c45

    SHA512

    e17a17f41d57dbf28fa775926e2085e19b5583c5399b2e5d36466c0d4ee70bf2eb3d3c2ae079995bcf1eee5e9c3aaa0c84fbf462dd0d8c6e5591ae2a1210a871

  • memory/1524-132-0x0000000000580000-0x0000000000604000-memory.dmp

    Filesize

    528KB

  • memory/1524-133-0x00007FFF257C0000-0x00007FFF26281000-memory.dmp

    Filesize

    10.8MB

  • memory/1524-138-0x00007FFF257C0000-0x00007FFF26281000-memory.dmp

    Filesize

    10.8MB

  • memory/4124-139-0x00007FFF257C0000-0x00007FFF26281000-memory.dmp

    Filesize

    10.8MB

  • memory/4124-141-0x000000001C840000-0x000000001C890000-memory.dmp

    Filesize

    320KB

  • memory/4124-142-0x000000001C950000-0x000000001CA02000-memory.dmp

    Filesize

    712KB

  • memory/4124-143-0x00007FFF257C0000-0x00007FFF26281000-memory.dmp

    Filesize

    10.8MB