Resubmissions

23-07-2021 10:14

210723-tke37qc4wx 10

24-06-2021 13:06

210624-tmff1at666 10

Analysis

  • max time kernel
    150s
  • max time network
    192s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    24-06-2021 13:06

General

  • Target

    439e49a4df2f4bcc359283d02f612e98.exe

  • Size

    527KB

  • MD5

    439e49a4df2f4bcc359283d02f612e98

  • SHA1

    bf6e8632bedeb80e72f664e2d4ca8b260a77115d

  • SHA256

    a792be03af23fe52b708d22df6cadeb3374bb5500416a862eee57ea56db20fd5

  • SHA512

    4d1fd328d45b67ce5a8acb91fe25cbc6e4b6bc252ef95e94cb43ae3264f83f77d0e66cff16fbe8b40a2ac063c8b95758dd6969001a1d56a7e4f96ca3a786c992

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

C2

45.77.20.114:1604

Mutex

39083318-6c39-4d8c-beda-fd48beb29cc9

Attributes
  • encryption_key

    7E1D5BE8A11725FE11CAC5785F9684E24960D4AC

  • install_name

    Media.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Media

  • subdirectory

    SubDir

Signatures

  • Quasar Payload 2 IoCs
  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Executes dropped EXE 1 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 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\439e49a4df2f4bcc359283d02f612e98.exe
    "C:\Users\Admin\AppData\Local\Temp\439e49a4df2f4bcc359283d02f612e98.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1932
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "Media" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\439e49a4df2f4bcc359283d02f612e98.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:1700
    • C:\Users\Admin\AppData\Roaming\SubDir\Media.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Media.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:296
      • C:\Windows\system32\schtasks.exe
        "schtasks" /create /tn "Media" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Media.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:868

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\SubDir\Media.exe
    MD5

    439e49a4df2f4bcc359283d02f612e98

    SHA1

    bf6e8632bedeb80e72f664e2d4ca8b260a77115d

    SHA256

    a792be03af23fe52b708d22df6cadeb3374bb5500416a862eee57ea56db20fd5

    SHA512

    4d1fd328d45b67ce5a8acb91fe25cbc6e4b6bc252ef95e94cb43ae3264f83f77d0e66cff16fbe8b40a2ac063c8b95758dd6969001a1d56a7e4f96ca3a786c992

  • C:\Users\Admin\AppData\Roaming\SubDir\Media.exe
    MD5

    439e49a4df2f4bcc359283d02f612e98

    SHA1

    bf6e8632bedeb80e72f664e2d4ca8b260a77115d

    SHA256

    a792be03af23fe52b708d22df6cadeb3374bb5500416a862eee57ea56db20fd5

    SHA512

    4d1fd328d45b67ce5a8acb91fe25cbc6e4b6bc252ef95e94cb43ae3264f83f77d0e66cff16fbe8b40a2ac063c8b95758dd6969001a1d56a7e4f96ca3a786c992

  • \??\PIPE\lsarpc
    MD5

    d41d8cd98f00b204e9800998ecf8427e

    SHA1

    da39a3ee5e6b4b0d3255bfef95601890afd80709

    SHA256

    e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

    SHA512

    cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

  • memory/296-63-0x0000000000000000-mapping.dmp
  • memory/296-66-0x0000000000220000-0x0000000000221000-memory.dmp
    Filesize

    4KB

  • memory/296-68-0x000000001B140000-0x000000001B142000-memory.dmp
    Filesize

    8KB

  • memory/868-70-0x0000000000000000-mapping.dmp
  • memory/1700-62-0x0000000000000000-mapping.dmp
  • memory/1932-59-0x0000000000BC0000-0x0000000000BC1000-memory.dmp
    Filesize

    4KB

  • memory/1932-61-0x000000001ACA0000-0x000000001ACA2000-memory.dmp
    Filesize

    8KB