quasar | 447529784d832ce5ae8cb18a8ff2ccb62927dc77f5fdd012c4d889b6e75178ac

General

Target

Client-built.exe
Size

3.1MB
MD5

3c7795d8fefe0d42a3313ebb51a758df
SHA1

9b035f6f7382b7b3679587f6f3321453a11c2b96
SHA256

447529784d832ce5ae8cb18a8ff2ccb62927dc77f5fdd012c4d889b6e75178ac
SHA512

915db2a5e693d99a671dee0f16e3361452bb7fecb496d871c2382c08f245e1a43d8fe3f2c26b949595e9bcefa63b52f9b6aaaf3a9181ff6e8f804ee3eddd1e7f
SSDEEP

49152:uvnI22SsaNYfdPBldt698dBcjHjuQ6k2MuYk/GLoGd65THHB72eh2NT:uvI22SsaNYfdPBldt6+dBcjHyQ60q

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.0.112:4782

Mutex

8878a190-04d1-47d5-8e2a-347d2e7ad6ef

Attributes

encryption_key
E977E81CC751295D2543CD279B3FB4FA6DD002E1
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/2756-1-0x0000000000E90000-0x00000000011B4000-memory.dmp	family_quasar
behavioral1/files/0x000e000000017467-6.dat	family_quasar
behavioral1/memory/2728-9-0x0000000000D20000-0x0000000001044000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2728	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
884	schtasks.exe
2696	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2756	Client-built.exe
Token: SeDebugPrivilege	2728	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2728	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2728	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2728	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2756 wrote to memory of 884	2756	Client-built.exe	31
PID 2756 wrote to memory of 884	2756	Client-built.exe	31
PID 2756 wrote to memory of 884	2756	Client-built.exe	31
PID 2756 wrote to memory of 2728	2756	Client-built.exe	33
PID 2756 wrote to memory of 2728	2756	Client-built.exe	33
PID 2756 wrote to memory of 2728	2756	Client-built.exe	33
PID 2728 wrote to memory of 2696	2728	Client.exe	34
PID 2728 wrote to memory of 2696	2728	Client.exe	34
PID 2728 wrote to memory of 2696	2728	Client.exe	34

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:2756
- 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:884
- 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:2728
- - 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:2696

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
3c7795d8fefe0d42a3313ebb51a758df

SHA1
9b035f6f7382b7b3679587f6f3321453a11c2b96

SHA256
447529784d832ce5ae8cb18a8ff2ccb62927dc77f5fdd012c4d889b6e75178ac

SHA512
915db2a5e693d99a671dee0f16e3361452bb7fecb496d871c2382c08f245e1a43d8fe3f2c26b949595e9bcefa63b52f9b6aaaf3a9181ff6e8f804ee3eddd1e7f

Download Submit
memory/2728-9-0x0000000000D20000-0x0000000001044000-memory.dmp

Filesize
3.1MB

Download
memory/2728-10-0x000007FEF65E0000-0x000007FEF6FCC000-memory.dmp

Filesize
9.9MB

Download
memory/2728-11-0x000007FEF65E0000-0x000007FEF6FCC000-memory.dmp

Filesize
9.9MB

Download
memory/2728-12-0x000007FEF65E0000-0x000007FEF6FCC000-memory.dmp

Filesize
9.9MB

Download
memory/2756-0-0x000007FEF65E3000-0x000007FEF65E4000-memory.dmp

Filesize
4KB

Download
memory/2756-1-0x0000000000E90000-0x00000000011B4000-memory.dmp

Filesize
3.1MB

Download
memory/2756-2-0x000007FEF65E0000-0x000007FEF6FCC000-memory.dmp

Filesize
9.9MB

Download
memory/2756-8-0x000007FEF65E0000-0x000007FEF6FCC000-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