quasar | 14cad65e79b0d7faf6829d7c30bf504ae66e4adc0a28981eb50e5d00465e0645

General

Target

Client-built.exe
Size

3.1MB
MD5

c65338d7d892863734f74ee949cb7a16
SHA1

50151ab64046e04bc2e8d58c7c3bff0991299e9b
SHA256

14cad65e79b0d7faf6829d7c30bf504ae66e4adc0a28981eb50e5d00465e0645
SHA512

c0fa19c86ecb29c62569b7681be92f75b3f6b85d41623b7e26ee6ebd26ce3c91f4dbdfdcc47a05c681e2f496d9b0644cd64b07fb2168b1b119b7d503c539f6d0
SSDEEP

49152:Svht62XlaSFNWPjljiFa2RoUYIV34abRDKLoGOZTHHB72eh2NT:SvL62XlaSFNWPjljiFXRoUYIV34K0

Score

10^/10

quasar office04 persistence spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.28:4782

Mutex

03ef2b9a-5389-4312-b3d3-9b6f68cc5386

Attributes

encryption_key
F8A900CD75D848E74023B3A66FA8AA5469C97692
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
.
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/2824-1-0x0000000000370000-0x0000000000694000-memory.dmp	family_quasar
behavioral1/files/0x003500000001543d-5.dat	family_quasar
behavioral1/memory/2852-8-0x0000000001210000-0x0000000001534000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2852	Client.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Run\. = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\""	Client-built.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Run\. = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\""	Client.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
2908	schtasks.exe
2700	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2824	Client-built.exe
Token: SeDebugPrivilege	2852	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2852	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2824 wrote to memory of 2908	2824	Client-built.exe	30
PID 2824 wrote to memory of 2908	2824	Client-built.exe	30
PID 2824 wrote to memory of 2908	2824	Client-built.exe	30
PID 2824 wrote to memory of 2852	2824	Client-built.exe	32
PID 2824 wrote to memory of 2852	2824	Client-built.exe	32
PID 2824 wrote to memory of 2852	2824	Client-built.exe	32
PID 2852 wrote to memory of 2700	2852	Client.exe	33
PID 2852 wrote to memory of 2700	2852	Client.exe	33
PID 2852 wrote to memory of 2700	2852	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⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2824
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "." /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2908
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2852
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "." /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2700

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

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
c65338d7d892863734f74ee949cb7a16

SHA1
50151ab64046e04bc2e8d58c7c3bff0991299e9b

SHA256
14cad65e79b0d7faf6829d7c30bf504ae66e4adc0a28981eb50e5d00465e0645

SHA512
c0fa19c86ecb29c62569b7681be92f75b3f6b85d41623b7e26ee6ebd26ce3c91f4dbdfdcc47a05c681e2f496d9b0644cd64b07fb2168b1b119b7d503c539f6d0

Download Submit
memory/2824-0-0x000007FEF5433000-0x000007FEF5434000-memory.dmp

Filesize
4KB

Download
memory/2824-1-0x0000000000370000-0x0000000000694000-memory.dmp

Filesize
3.1MB

Download
memory/2824-2-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

Filesize
9.9MB

Download
memory/2824-7-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

Filesize
9.9MB

Download
memory/2852-8-0x0000000001210000-0x0000000001534000-memory.dmp

Filesize
3.1MB

Download
memory/2852-9-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

Filesize
9.9MB

Download
memory/2852-10-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

Filesize
9.9MB

Download
memory/2852-11-0x000007FEF5430000-0x000007FEF5E1C000-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