quasar | d49ea0eeb7f55bc51d0862c6a94cf0495f107122e6771d4dc4115fce5d9bfcb1

General

Target

Client-built.exe
Size

3.1MB
MD5

e7b38e84926048dd156d4c246675823a
SHA1

40ab7eaffb7b098e736ade0eee720856c3e38cd9
SHA256

d49ea0eeb7f55bc51d0862c6a94cf0495f107122e6771d4dc4115fce5d9bfcb1
SHA512

e74a37e088f36ad656b86907999c2178c7868803e964acc74cfe54fef6ae7e1f845ebad470655dd896c03d6679e9a7d5a07791bb2b796c6355bf989b57e3ba9f
SSDEEP

49152:rvVG42pda6D+/PjlLOlg6yQipVhQg7vbR6LoGd8xTHHB72eh2NT:rvM42pda6D+/PjlLOlZyQipVh37K

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.208.1:7672

127.000.1:7672

192.168.208.1:37664

Mutex

43703048-944d-4b25-8c70-d875b0b3b227

Attributes

encryption_key
62FBCC4DFDC2A6A90B45D09307BE1ECC156199ED
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 3 IoCs

resource	yara_rule
behavioral1/memory/3040-1-0x0000000000F80000-0x00000000012A4000-memory.dmp	family_quasar
behavioral1/files/0x0008000000016dd5-6.dat	family_quasar
behavioral1/memory/2700-9-0x0000000000D30000-0x0000000001054000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2700	Client.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir	Client-built.exe
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	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
2784	schtasks.exe
2860	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3040	Client-built.exe
Token: SeDebugPrivilege	2700	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2700	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2700	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2700	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3040 wrote to memory of 2784	3040	Client-built.exe	30
PID 3040 wrote to memory of 2784	3040	Client-built.exe	30
PID 3040 wrote to memory of 2784	3040	Client-built.exe	30
PID 3040 wrote to memory of 2700	3040	Client-built.exe	32
PID 3040 wrote to memory of 2700	3040	Client-built.exe	32
PID 3040 wrote to memory of 2700	3040	Client-built.exe	32
PID 2700 wrote to memory of 2860	2700	Client.exe	33
PID 2700 wrote to memory of 2860	2700	Client.exe	33
PID 2700 wrote to memory of 2860	2700	Client.exe	33

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:3040
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2784
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2700
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2860

Network

MITRE ATT&CK Enterprise v15

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

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
3.1MB

MD5
e7b38e84926048dd156d4c246675823a

SHA1
40ab7eaffb7b098e736ade0eee720856c3e38cd9

SHA256
d49ea0eeb7f55bc51d0862c6a94cf0495f107122e6771d4dc4115fce5d9bfcb1

SHA512
e74a37e088f36ad656b86907999c2178c7868803e964acc74cfe54fef6ae7e1f845ebad470655dd896c03d6679e9a7d5a07791bb2b796c6355bf989b57e3ba9f

Download Submit
memory/2700-8-0x000007FEF50C0000-0x000007FEF5AAC000-memory.dmp

Filesize
9.9MB

Download
memory/2700-9-0x0000000000D30000-0x0000000001054000-memory.dmp

Filesize
3.1MB

Download
memory/2700-11-0x000007FEF50C0000-0x000007FEF5AAC000-memory.dmp

Filesize
9.9MB

Download
memory/2700-12-0x000007FEF50C0000-0x000007FEF5AAC000-memory.dmp

Filesize
9.9MB

Download
memory/3040-0-0x000007FEF50C3000-0x000007FEF50C4000-memory.dmp

Filesize
4KB

Download
memory/3040-1-0x0000000000F80000-0x00000000012A4000-memory.dmp

Filesize
3.1MB

Download
memory/3040-2-0x000007FEF50C0000-0x000007FEF5AAC000-memory.dmp

Filesize
9.9MB

Download
memory/3040-10-0x000007FEF50C0000-0x000007FEF5AAC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads