quasar | 89fa63d15ed2d1efecb7cea57600721b74f90e2f83e213f556759e788133a75d

General

Target

Client-built.exe
Size

3.1MB
MD5

6d6b0853a2aac3f0fe8403826e778cfd
SHA1

2a7d910997330b2e00555252603b725af6a9a8bb
SHA256

89fa63d15ed2d1efecb7cea57600721b74f90e2f83e213f556759e788133a75d
SHA512

2d1b1af0c174c85f0c0be5f946a71826c8d18489d7b6c8a8f8d09a9709f1669c232e270fbce945d04740c5cfabf46e17e17a291d263c537a04dda8932e40ec28
SSDEEP

49152:Hv+I22SsaNYfdPBldt698dBcjHFFRJ6PbR3LoGd4hyTHHB72eh2NT:Hvz22SsaNYfdPBldt6+dBcjHFFRJ6hG

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.181.84:4782

Mutex

1ed20179-691a-4881-806d-c5d12340d8e9

Attributes

encryption_key
DF9BFB10D9C47294CB84A29DC07B28AE843D8C6F
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/432-1-0x0000000001270000-0x0000000001594000-memory.dmp	family_quasar
behavioral1/files/0x0009000000016cd8-6.dat	family_quasar
behavioral1/memory/2880-10-0x0000000000EE0000-0x0000000001204000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2880	Client.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
3068	schtasks.exe
2948	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	432	Client-built.exe
Token: SeDebugPrivilege	2880	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2880	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2880	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2880	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 432 wrote to memory of 3068	432	Client-built.exe	29
PID 432 wrote to memory of 3068	432	Client-built.exe	29
PID 432 wrote to memory of 3068	432	Client-built.exe	29
PID 432 wrote to memory of 2880	432	Client-built.exe	31
PID 432 wrote to memory of 2880	432	Client-built.exe	31
PID 432 wrote to memory of 2880	432	Client-built.exe	31
PID 2880 wrote to memory of 2948	2880	Client.exe	32
PID 2880 wrote to memory of 2948	2880	Client.exe	32
PID 2880 wrote to memory of 2948	2880	Client.exe	32

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:432
- 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:3068
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2880
- - 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:2948

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

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Downloads

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

Filesize
3.1MB

MD5
6d6b0853a2aac3f0fe8403826e778cfd

SHA1
2a7d910997330b2e00555252603b725af6a9a8bb

SHA256
89fa63d15ed2d1efecb7cea57600721b74f90e2f83e213f556759e788133a75d

SHA512
2d1b1af0c174c85f0c0be5f946a71826c8d18489d7b6c8a8f8d09a9709f1669c232e270fbce945d04740c5cfabf46e17e17a291d263c537a04dda8932e40ec28

Download Submit
memory/432-0-0x000007FEF65A3000-0x000007FEF65A4000-memory.dmp

Filesize
4KB

Download
memory/432-1-0x0000000001270000-0x0000000001594000-memory.dmp

Filesize
3.1MB

Download
memory/432-2-0x000007FEF65A0000-0x000007FEF6F8C000-memory.dmp

Filesize
9.9MB

Download
memory/432-8-0x000007FEF65A0000-0x000007FEF6F8C000-memory.dmp

Filesize
9.9MB

Download
memory/2880-9-0x000007FEF65A0000-0x000007FEF6F8C000-memory.dmp

Filesize
9.9MB

Download
memory/2880-10-0x0000000000EE0000-0x0000000001204000-memory.dmp

Filesize
3.1MB

Download
memory/2880-11-0x000007FEF65A0000-0x000007FEF6F8C000-memory.dmp

Filesize
9.9MB

Download
memory/2880-12-0x000007FEF65A0000-0x000007FEF6F8C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads