quasar | 7f50a9f5438fadc55d4e58f08e038a9b5c91616805adbaffc0a5d479ab3bea40

Analysis

max time kernel
93s
max time network
128s
platform
windows10-2004_x64
resource
win10v2004-20250129-en
resource tags

arch:x64arch:x86image:win10v2004-20250129-enlocale:en-usos:windows10-2004-x64system
submitted
03-02-2025 19:04

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General

Target

asbdasb.exe
Size

3.1MB
MD5

ccc57d21edec2c59a19ea5fe7ed1a943
SHA1

2a76498d6f373dbd6820b0d105a8a94ff47836ce
SHA256

7f50a9f5438fadc55d4e58f08e038a9b5c91616805adbaffc0a5d479ab3bea40
SHA512

9d11de6305fe4f6ddce088fcb8bc6b409e88a26392f956e6adb91c9ce1b2286834ffff246174c3cdf0c32408dbcb56b724b5e536bec21e7f187becfa58e225cf
SSDEEP

49152:Sv+I22SsaNYfdPBldt698dBcjHe/7571v+Lo7desTHHB72eh2NT:Svz22SsaNYfdPBldt6+dBcjHe/756

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

rdtgtdrgfd-56277.portmap.host:56277

Mutex

ccf570e8-30ac-4f23-9902-868025b6d01c

Attributes

encryption_key
AB41F22B350F9B05BD105DBC654AA3C338A22A14
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
1
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/3356-1-0x0000000000F60000-0x0000000001284000-memory.dmp	family_quasar
behavioral2/files/0x000d000000023b70-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
860	Client.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client.exe
File opened for modification	C:\Windows\system32\SubDir	Client.exe
File created	C:\Windows\system32\SubDir\Client.exe	asbdasb.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	asbdasb.exe
File opened for modification	C:\Windows\system32\SubDir	asbdasb.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
2244	schtasks.exe
4516	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3356	asbdasb.exe
Token: SeDebugPrivilege	860	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
860	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3356 wrote to memory of 2244	3356	asbdasb.exe	86
PID 3356 wrote to memory of 2244	3356	asbdasb.exe	86
PID 3356 wrote to memory of 860	3356	asbdasb.exe	88
PID 3356 wrote to memory of 860	3356	asbdasb.exe	88
PID 860 wrote to memory of 4516	860	Client.exe	89
PID 860 wrote to memory of 4516	860	Client.exe	89

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\asbdasb.exe
"C:\Users\Admin\AppData\Local\Temp\asbdasb.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3356
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "1" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2244
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:860
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "1" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4516

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:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
ccc57d21edec2c59a19ea5fe7ed1a943

SHA1
2a76498d6f373dbd6820b0d105a8a94ff47836ce

SHA256
7f50a9f5438fadc55d4e58f08e038a9b5c91616805adbaffc0a5d479ab3bea40

SHA512
9d11de6305fe4f6ddce088fcb8bc6b409e88a26392f956e6adb91c9ce1b2286834ffff246174c3cdf0c32408dbcb56b724b5e536bec21e7f187becfa58e225cf

Download Submit
memory/860-9-0x00007FF9F5890000-0x00007FF9F6351000-memory.dmp

Filesize
10.8MB

Download
memory/860-11-0x00007FF9F5890000-0x00007FF9F6351000-memory.dmp

Filesize
10.8MB

Download
memory/860-12-0x0000000002950000-0x00000000029A0000-memory.dmp

Filesize
320KB

Download
memory/860-13-0x000000001BC90000-0x000000001BD42000-memory.dmp

Filesize
712KB

Download
memory/860-14-0x000000001B4B0000-0x000000001B4C2000-memory.dmp

Filesize
72KB

Download
memory/860-15-0x000000001BC10000-0x000000001BC4C000-memory.dmp

Filesize
240KB

Download
memory/860-16-0x00007FF9F5890000-0x00007FF9F6351000-memory.dmp

Filesize
10.8MB

Download
memory/3356-0-0x00007FF9F5893000-0x00007FF9F5895000-memory.dmp

Filesize
8KB

Download
memory/3356-1-0x0000000000F60000-0x0000000001284000-memory.dmp

Filesize
3.1MB

Download
memory/3356-2-0x00007FF9F5890000-0x00007FF9F6351000-memory.dmp

Filesize
10.8MB

Download
memory/3356-10-0x00007FF9F5890000-0x00007FF9F6351000-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