quasar | 77a7cd3a32b8f2034e427b8d7ca740a6c4f9e0bc79d4b7eddd7922668ef9f24a

General

Target

2025-04-20_ac8e7f19e4d3e6ad8bdabd57dc79063e_black-basta_cobalt-strike_satacom.exe
Size

1.5MB
MD5

ac8e7f19e4d3e6ad8bdabd57dc79063e
SHA1

2dcf6ea2e23dd4f1b774693cde1555b02abd28c9
SHA256

77a7cd3a32b8f2034e427b8d7ca740a6c4f9e0bc79d4b7eddd7922668ef9f24a
SHA512

ffc28fa7cca91a15263e86d973dbdfc19dd1030c46b822d9b01ab4582b6d787dc3c18a10dbd9824d69e25403c1f61456fdf31030fb853a49aff190ac7e47016a
SSDEEP

24576:xEeqQq3KnmI5yjNeGNcZQg0pWdKZGzgDv7hEiOTVGT6QZhkVyYtW:xEuq6mAyjMGNcZOWdsz7exq/kVRtW

Score

10^/10

quasar java spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Java

C2

192.168.1.33:4782

Mutex

dbd83e28-626e-4246-bc34-1a191d13a0d2

Attributes

encryption_key
F99A16169D9E428A1B70483052E7EC2C3781496E
install_name
javaupdater.exe
log_directory
Logs
reconnect_delay
3000
startup_key
java
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
behavioral1/files/0x00080000000242b0-6.dat	family_quasar
behavioral1/memory/1904-15-0x0000000000530000-0x0000000000854000-memory.dmp	family_quasar

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3342763580-2723508992-2885672917-1000\Control Panel\International\Geo\Nation	2025-04-20_ac8e7f19e4d3e6ad8bdabd57dc79063e_black-basta_cobalt-strike_satacom.exe

Executes dropped EXE 2 IoCs

pid	Process
1904	java.exe
4744	javaupdater.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\javaupdater.exe	java.exe
File opened for modification	C:\Windows\system32\SubDir\javaupdater.exe	java.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
1100	schtasks.exe
4816	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1904	java.exe
Token: SeDebugPrivilege	4744	javaupdater.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4744	javaupdater.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4744	javaupdater.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4744	javaupdater.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 6116 wrote to memory of 1904	6116	2025-04-20_ac8e7f19e4d3e6ad8bdabd57dc79063e_black-basta_cobalt-strike_satacom.exe	94
PID 6116 wrote to memory of 1904	6116	2025-04-20_ac8e7f19e4d3e6ad8bdabd57dc79063e_black-basta_cobalt-strike_satacom.exe	94
PID 1904 wrote to memory of 4816	1904	java.exe	96
PID 1904 wrote to memory of 4816	1904	java.exe	96
PID 1904 wrote to memory of 4744	1904	java.exe	98
PID 1904 wrote to memory of 4744	1904	java.exe	98
PID 4744 wrote to memory of 1100	4744	javaupdater.exe	101
PID 4744 wrote to memory of 1100	4744	javaupdater.exe	101

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\2025-04-20_ac8e7f19e4d3e6ad8bdabd57dc79063e_black-basta_cobalt-strike_satacom.exe
"C:\Users\Admin\AppData\Local\Temp\2025-04-20_ac8e7f19e4d3e6ad8bdabd57dc79063e_black-basta_cobalt-strike_satacom.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:6116
- C:\Users\Admin\AppData\Local\Temp\RarSFX0\java.exe
  "C:\Users\Admin\AppData\Local\Temp\RarSFX0\java.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1904
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "java" /sc ONLOGON /tr "C:\Windows\system32\SubDir\javaupdater.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4816
- - C:\Windows\system32\SubDir\javaupdater.exe
    "C:\Windows\system32\SubDir\javaupdater.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of FindShellTrayWindow
    - Suspicious use of SendNotifyMessage
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:4744
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "java" /sc ONLOGON /tr "C:\Windows\system32\SubDir\javaupdater.exe" /rl HIGHEST /f
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:1100

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\RarSFX0\java.exe

Filesize
3.1MB

MD5
8bb0dc5d9a0aa31d1220b8a5c841d63f

SHA1
9db89465ff40e3d2a527fd32415edec54375a579

SHA256
6db909315993c048d5236ff97c4c3ff648de6ea67850b3c33cbbc33e779dd5bf

SHA512
cd9c638ee17a05c71161967a0ace7381d84f4a0142d9324110f6c785a0ee150a23760f7bd64f7db3203823fd4a8a6430f63260585ed148fde802c2fb57a4dcc4

Download Submit
memory/1904-14-0x00007FFFB70C3000-0x00007FFFB70C5000-memory.dmp

Filesize
8KB

Download
memory/1904-15-0x0000000000530000-0x0000000000854000-memory.dmp

Filesize
3.1MB

Download
memory/1904-16-0x00007FFFB70C0000-0x00007FFFB7B81000-memory.dmp

Filesize
10.8MB

Download
memory/1904-22-0x00007FFFB70C0000-0x00007FFFB7B81000-memory.dmp

Filesize
10.8MB

Download
memory/4744-24-0x000000001C350000-0x000000001C402000-memory.dmp

Filesize
712KB

Download
memory/4744-23-0x000000001C240000-0x000000001C290000-memory.dmp

Filesize
320KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads