quasar | f84484392271761f6894d474af57c959f72b40bf0afbd3ff00c34d9aaadd49f6

Analysis

max time kernel
149s
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
04-01-2025 10:04

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General

Target

Client-built.exe
Size

3.1MB
MD5

00213fcafbc3094166240f85a2113a48
SHA1

bca3cb12ffc1deecaa48e75fd044d12bbbfdc7be
SHA256

f84484392271761f6894d474af57c959f72b40bf0afbd3ff00c34d9aaadd49f6
SHA512

b048cc823268d731b0b35600723cb4a58fa108f1ef48f1ebad7b522a6c8656c981e363d5a908403b1ef20909d2624c325d22df2143774190b12f5fcb3741fa10
SSDEEP

49152:rvmI22SsaNYfdPBldt698dBcjHGCW1JbLoGd4THHB72eh2NT:rvr22SsaNYfdPBldt6+dBcjHGCi

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.46:4782

Mutex

f6997eed-21d3-4b8e-b10b-56ea04111c63

Attributes

encryption_key
7E7C408B51CEDDF4082BCC64D506AE67B3B3044D
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.
trojan spyware quasar
Quasar family
quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/4128-1-0x0000000000A30000-0x0000000000D54000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023cb5-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3876	Client.exe

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
1904	schtasks.exe
4720	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4128	Client-built.exe
Token: SeDebugPrivilege	3876	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4128 wrote to memory of 1904	4128	Client-built.exe	82
PID 4128 wrote to memory of 1904	4128	Client-built.exe	82
PID 4128 wrote to memory of 3876	4128	Client-built.exe	84
PID 4128 wrote to memory of 3876	4128	Client-built.exe	84
PID 3876 wrote to memory of 4720	3876	Client.exe	85
PID 3876 wrote to memory of 4720	3876	Client.exe	85

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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4128
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1904
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3876
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4720

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
00213fcafbc3094166240f85a2113a48

SHA1
bca3cb12ffc1deecaa48e75fd044d12bbbfdc7be

SHA256
f84484392271761f6894d474af57c959f72b40bf0afbd3ff00c34d9aaadd49f6

SHA512
b048cc823268d731b0b35600723cb4a58fa108f1ef48f1ebad7b522a6c8656c981e363d5a908403b1ef20909d2624c325d22df2143774190b12f5fcb3741fa10

Download Submit
memory/3876-9-0x00007FFD37FB0000-0x00007FFD38A71000-memory.dmp

Filesize
10.8MB

Download
memory/3876-10-0x00007FFD37FB0000-0x00007FFD38A71000-memory.dmp

Filesize
10.8MB

Download
memory/3876-11-0x000000001B210000-0x000000001B260000-memory.dmp

Filesize
320KB

Download
memory/3876-12-0x000000001B840000-0x000000001B8F2000-memory.dmp

Filesize
712KB

Download
memory/3876-14-0x00007FFD37FB0000-0x00007FFD38A71000-memory.dmp

Filesize
10.8MB

Download
memory/4128-0-0x00007FFD37FB3000-0x00007FFD37FB5000-memory.dmp

Filesize
8KB

Download
memory/4128-1-0x0000000000A30000-0x0000000000D54000-memory.dmp

Filesize
3.1MB

Download
memory/4128-2-0x00007FFD37FB0000-0x00007FFD38A71000-memory.dmp

Filesize
10.8MB

Download
memory/4128-13-0x00007FFD37FB0000-0x00007FFD38A71000-memory.dmp

Filesize
10.8MB

Download

Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads