Overview

overview

10

Static

static

10

api-ms-win...-0.exe

windows7-x64

10

api-ms-win...-0.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    157s
  • max time network
    163s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12-01-2024 14:13

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General

  • Target

    api-ms-win-crt-environment-l1-1-0.exe

  • Size

    3.1MB

  • MD5

    8c1e7d74c62a687a236a3262f09269d4

  • SHA1

    896a403897661d3834f540a10678463f4ef4c81d

  • SHA256

    9e6fa1f280864e2933528e17984bf2d448b003bda842145f34e63cc8a4b337ef

  • SHA512

    85f98c7c311c224043a588180ff170290b6e5cffc78edb77cbfbc8bfc662d34b17c7f9a6a9708f769398854284b98e9d14d45229b2f74c19ce52481f4887bc24

  • SSDEEP

    49152:Pv1A62jiaQDKwPFlJn3xFQsZQOdmRJ6abR3LoGdMoTHHB72eh2NT:Pve62jiaQDKwPFlJn3TQsZQOdmRJ60

Score
10/10
quasarsvchostspywaretrojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

svchost

C2

szczurson1337.freemyip.com:63027

Mutex

480dd827-793e-49b8-b01d-ed2623e7d90a

Attributes
  • encryption_key

    6891155C128F5ED55194A86C4A5AB7A3EE3E2C5B

  • install_name

    api-ms-win-crt-environment-l1-0-1.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    api-ms-win-crt-environment-l1-1-0

  • subdirectory

    downlevel

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

    trojanspywarequasar
  • Quasar payload 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 3 IoCs
  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

    persistence
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

    persistence

Processes

  • C:\Users\Admin\AppData\Local\Temp\api-ms-win-crt-environment-l1-1-0.exe
    "C:\Users\Admin\AppData\Local\Temp\api-ms-win-crt-environment-l1-1-0.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4684
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "api-ms-win-crt-environment-l1-1-0" /sc ONLOGON /tr "C:\Windows\system32\downlevel\api-ms-win-crt-environment-l1-0-1.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:5048
    • C:\Windows\system32\downlevel\api-ms-win-crt-environment-l1-0-1.exe
      "C:\Windows\system32\downlevel\api-ms-win-crt-environment-l1-0-1.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:948
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "api-ms-win-crt-environment-l1-1-0" /sc ONLOGON /tr "C:\Windows\system32\downlevel\api-ms-win-crt-environment-l1-0-1.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:4524

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Scheduled Task/Job

1
T1053

Persistence

Scheduled Task/Job

1
T1053

Privilege Escalation

Scheduled Task/Job

1
T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1
T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

  • C:\Windows\System32\downlevel\api-ms-win-crt-environment-l1-0-1.exe
    Filesize

    381KB

    MD5

    a729de68d38f7036fc7ebe307e373193

    SHA1

    3fc615557c7bfe6264f49c2e4d721ead0861ce58

    SHA256

    02de690a54dda0aacc09cfebe786fc87505c1b8125b2614025c18de67023015e

    SHA512

    750b9753abb667d9fc51f4c663d854bec0b67816f61d0a6079455bcbfe9be1537e02596bd18dc651c080d8042f62682fe6a2deb6de2b7529e38afc2d5e3c155b

    Download Submit
  • C:\Windows\system32\downlevel\api-ms-win-crt-environment-l1-0-1.exe
    Filesize

    458KB

    MD5

    f5f48fe59e9cf2fe88a6fb3be5d2af4f

    SHA1

    dd21fbfb811d4c8007e26ed47cf5176f015f36e2

    SHA256

    c1105aeed96ddd890b79ead47cb0394f78443861511d5ce70cbbbc0b200a1a33

    SHA512

    4f042541d3d264342436b7bf5316ee5a2ee1c4db2f52338452cc6cf6eb0778b980fa7b4c38269e7805ca98e49b7c92ae24cae7ecfc1ed15fdd90874d799dc479

    Download Submit
  • memory/948-9-0x00007FFBA7B50000-0x00007FFBA8611000-memory.dmp
    Filesize

    10.8MB

    Download
  • memory/948-11-0x0000000002F00000-0x0000000002F10000-memory.dmp
    Filesize

    64KB

    Download
  • memory/948-12-0x000000001BBE0000-0x000000001BC30000-memory.dmp
    Filesize

    320KB

    Download
  • memory/948-13-0x000000001C730000-0x000000001C7E2000-memory.dmp
    Filesize

    712KB

    Download
  • memory/948-14-0x00007FFBA7B50000-0x00007FFBA8611000-memory.dmp
    Filesize

    10.8MB

    Download
  • memory/948-15-0x0000000002F00000-0x0000000002F10000-memory.dmp
    Filesize

    64KB

    Download
  • memory/4684-0-0x00000000005E0000-0x0000000000904000-memory.dmp
    Filesize

    3.1MB

    Download
  • memory/4684-1-0x00007FFBA7B50000-0x00007FFBA8611000-memory.dmp
    Filesize

    10.8MB

    Download
  • memory/4684-2-0x0000000000FD0000-0x0000000000FE0000-memory.dmp
    Filesize

    64KB

    Download
  • memory/4684-10-0x00007FFBA7B50000-0x00007FFBA8611000-memory.dmp
    Filesize

    10.8MB

    Download