quasar | fdba9e9d51c62d59de744a179a50ce9f5838af549f30f5b87c8175dace024fee

Analysis

max time kernel
126s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
13-12-2024 10:00

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General

Target

Client-built.exe
Size

502KB
MD5

05aa0a6d16f1dabf72b4c880a5d357d0
SHA1

4a3ebaa010ba5306cd09c07eb26bbe99ff46496f
SHA256

fdba9e9d51c62d59de744a179a50ce9f5838af549f30f5b87c8175dace024fee
SHA512

931a147bf27a8a14db99b8f6480dddfa2bd1e0b4aaa59092552ef93e9f93adddbcb71d7d9c7a1f45f7854e32d16555dc7f3be701a2df9578a9e99349e972758a
SSDEEP

6144:pTEgdc0YZXAGbgiIN2RSBX/bbVbkbLyUR3mRfbNcEIHb8F9w/Vg6cTR3K:pTEgdfY1bg7bNk2RB4kiVPcdK

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

69.160.242.105:4782

69.160.242.105:11066

Mutex

66661e0f-33c3-4f2f-88be-1634de535cd1

Attributes

encryption_key
CBED6820557E8011D93BA51D49F569DE8C1F98B4
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
java updater
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/1316-1-0x0000000000F10000-0x0000000000F94000-memory.dmp	family_quasar
behavioral2/files/0x000d000000023b6f-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3468	Client.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client-built.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
64	schtasks.exe
3996	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1316	Client-built.exe
Token: SeDebugPrivilege	3468	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3468	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3468	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3468	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1316 wrote to memory of 64	1316	Client-built.exe	83
PID 1316 wrote to memory of 64	1316	Client-built.exe	83
PID 1316 wrote to memory of 3468	1316	Client-built.exe	85
PID 1316 wrote to memory of 3468	1316	Client-built.exe	85
PID 3468 wrote to memory of 3996	3468	Client.exe	86
PID 3468 wrote to memory of 3996	3468	Client.exe	86

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

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1316
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:64
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3468
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3996

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
502KB

MD5
05aa0a6d16f1dabf72b4c880a5d357d0

SHA1
4a3ebaa010ba5306cd09c07eb26bbe99ff46496f

SHA256
fdba9e9d51c62d59de744a179a50ce9f5838af549f30f5b87c8175dace024fee

SHA512
931a147bf27a8a14db99b8f6480dddfa2bd1e0b4aaa59092552ef93e9f93adddbcb71d7d9c7a1f45f7854e32d16555dc7f3be701a2df9578a9e99349e972758a

Download Submit
memory/1316-0-0x00007FFC72ED3000-0x00007FFC72ED5000-memory.dmp

Filesize
8KB

Download
memory/1316-1-0x0000000000F10000-0x0000000000F94000-memory.dmp

Filesize
528KB

Download
memory/1316-2-0x00007FFC72ED0000-0x00007FFC73991000-memory.dmp

Filesize
10.8MB

Download
memory/1316-10-0x00007FFC72ED0000-0x00007FFC73991000-memory.dmp

Filesize
10.8MB

Download
memory/3468-8-0x00007FFC72ED0000-0x00007FFC73991000-memory.dmp

Filesize
10.8MB

Download
memory/3468-9-0x00007FFC72ED0000-0x00007FFC73991000-memory.dmp

Filesize
10.8MB

Download
memory/3468-11-0x000000001BCA0000-0x000000001BCF0000-memory.dmp

Filesize
320KB

Download
memory/3468-12-0x000000001BDB0000-0x000000001BE62000-memory.dmp

Filesize
712KB

Download
memory/3468-13-0x00007FFC72ED0000-0x00007FFC73991000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads