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 2 IoCs

resource	yara_rule
behavioral2/memory/5008-1-0x00000000009A0000-0x0000000000CC4000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c72-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4796	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
4204	schtasks.exe
3584	schtasks.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	5008	Client-built.exe
Token: SeDebugPrivilege	4796	Client.exe
Token: SeManageVolumePrivilege	5040	svchost.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4796	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4796	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4796	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5008 wrote to memory of 4204	5008	Client-built.exe	83
PID 5008 wrote to memory of 4204	5008	Client-built.exe	83
PID 5008 wrote to memory of 4796	5008	Client-built.exe	85
PID 5008 wrote to memory of 4796	5008	Client-built.exe	85
PID 4796 wrote to memory of 3584	4796	Client.exe	86
PID 4796 wrote to memory of 3584	4796	Client.exe	86

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:5008
- 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:4204
- 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:4796
- - 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:3584

C:\Windows\System32\svchost.exe
C:\Windows\System32\svchost.exe -k UnistackSvcGroup
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:5040

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe shell32.dll,SHCreateLocalServerRunDll {c82192ee-6cb5-4bc0-9ef0-fb818773790a} -Embedding
1⤵
PID:3188

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:4920

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\Local\Comms\UnistoreDB\store.jfm

Filesize
16KB

MD5
7cecf800f521e8c9d74cd1074d2e087a

SHA1
18a75ab112dbf29e05179499e1e9f0d8c5472834

SHA256
214ac2f793ed094aec3baf0980967a0d6a415ad4ddb5667a94cc1f75911ead00

SHA512
7fed709cbcc1abc7aef0ea297325b0e8fbf6b393999495e09c0c4b3cae41e59500f8b87658b40f512d2e45dcfcda977331a36c8956fa7dd77793d6693afc638f

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

Filesize
3.1MB

MD5
3c7795d8fefe0d42a3313ebb51a758df

SHA1
9b035f6f7382b7b3679587f6f3321453a11c2b96

SHA256
447529784d832ce5ae8cb18a8ff2ccb62927dc77f5fdd012c4d889b6e75178ac

SHA512
915db2a5e693d99a671dee0f16e3361452bb7fecb496d871c2382c08f245e1a43d8fe3f2c26b949595e9bcefa63b52f9b6aaaf3a9181ff6e8f804ee3eddd1e7f

Download Submit
memory/4796-9-0x00007FF97C100000-0x00007FF97CBC1000-memory.dmp

Filesize
10.8MB

Download
memory/4796-11-0x00007FF97C100000-0x00007FF97CBC1000-memory.dmp

Filesize
10.8MB

Download
memory/4796-12-0x000000001BD50000-0x000000001BDA0000-memory.dmp

Filesize
320KB

Download
memory/4796-13-0x000000001BE60000-0x000000001BF12000-memory.dmp

Filesize
712KB

Download
memory/4796-14-0x00007FF97C100000-0x00007FF97CBC1000-memory.dmp

Filesize
10.8MB

Download
memory/4796-85-0x000000001C790000-0x000000001CCB8000-memory.dmp

Filesize
5.2MB

Download
memory/5008-0-0x00007FF97C103000-0x00007FF97C105000-memory.dmp

Filesize
8KB

Download
memory/5008-1-0x00000000009A0000-0x0000000000CC4000-memory.dmp

Filesize
3.1MB

Download
memory/5008-2-0x00007FF97C100000-0x00007FF97CBC1000-memory.dmp

Filesize
10.8MB

Download
memory/5008-10-0x00007FF97C100000-0x00007FF97CBC1000-memory.dmp

Filesize
10.8MB

Download
memory/5040-48-0x0000029F224E0000-0x0000029F224E1000-memory.dmp

Filesize
4KB

Download
memory/5040-58-0x0000029F22100000-0x0000029F22101000-memory.dmp

Filesize
4KB

Download
memory/5040-49-0x0000029F224E0000-0x0000029F224E1000-memory.dmp

Filesize
4KB

Download
memory/5040-51-0x0000029F224E0000-0x0000029F224E1000-memory.dmp

Filesize
4KB

Download
memory/5040-47-0x0000029F224B0000-0x0000029F224B1000-memory.dmp

Filesize
4KB

Download
memory/5040-53-0x0000029F224E0000-0x0000029F224E1000-memory.dmp

Filesize
4KB

Download
memory/5040-52-0x0000029F224E0000-0x0000029F224E1000-memory.dmp

Filesize
4KB

Download
memory/5040-54-0x0000029F224E0000-0x0000029F224E1000-memory.dmp

Filesize
4KB

Download
memory/5040-55-0x0000029F224E0000-0x0000029F224E1000-memory.dmp

Filesize
4KB

Download
memory/5040-56-0x0000029F224E0000-0x0000029F224E1000-memory.dmp

Filesize
4KB

Download
memory/5040-57-0x0000029F224E0000-0x0000029F224E1000-memory.dmp

Filesize
4KB

Download
memory/5040-50-0x0000029F224E0000-0x0000029F224E1000-memory.dmp

Filesize
4KB

Download
memory/5040-59-0x0000029F220F0000-0x0000029F220F1000-memory.dmp

Filesize
4KB

Download
memory/5040-61-0x0000029F22100000-0x0000029F22101000-memory.dmp

Filesize
4KB

Download
memory/5040-64-0x0000029F220F0000-0x0000029F220F1000-memory.dmp

Filesize
4KB

Download
memory/5040-67-0x0000029F197F0000-0x0000029F197F1000-memory.dmp

Filesize
4KB

Download
memory/5040-31-0x0000029F19F40000-0x0000029F19F50000-memory.dmp

Filesize
64KB

Download
memory/5040-79-0x0000029F22230000-0x0000029F22231000-memory.dmp

Filesize
4KB

Download
memory/5040-81-0x0000029F22240000-0x0000029F22241000-memory.dmp

Filesize
4KB

Download
memory/5040-82-0x0000029F22240000-0x0000029F22241000-memory.dmp

Filesize
4KB

Download
memory/5040-83-0x0000029F22350000-0x0000029F22351000-memory.dmp

Filesize
4KB

Download
memory/5040-15-0x0000029F19E40000-0x0000029F19E50000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads