quasar | b42c4e3557412a2ec458d1e7e73501b84a9fcef3a9a0b5eed172d0af619c59c6

General

Target

Client-built.exe
Size

3.1MB
MD5

5d941424d5ea2bcacc9205837acc1dff
SHA1

dad94e588db27fb9afabce3831f2bf4f6ed1e8f2
SHA256

b42c4e3557412a2ec458d1e7e73501b84a9fcef3a9a0b5eed172d0af619c59c6
SHA512

f3ef395430ccb27ab7fbac3b8b120aac0d93ac605b09862bfa3085005e9e241e6deee3def80ed7d6c8ae7a1c46c93400ad97f0049e5f79aefb05e65a82d1dab4
SSDEEP

49152:Cv3I22SsaNYfdPBldt698dBcjHjExNESECk/iWLoGdgTHHB72eh2NT:Cv422SsaNYfdPBldt6+dBcjHYxpY

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

Waix-40247.portmap.host:40247

Mutex

9d84e220-c4b7-4f5c-b179-163c03154a8f

Attributes

encryption_key
B963B2000CDCB4E83B2966F1E1C703720463EE18
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/2176-1-0x0000000000A30000-0x0000000000D54000-memory.dmp	family_quasar
behavioral1/files/0x0007000000019259-6.dat	family_quasar
behavioral1/memory/2780-10-0x0000000001230000-0x0000000001554000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2780	Client.exe

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\SubDir	Client-built.exe
File opened for modification	C:\Program Files\SubDir\Client.exe	Client.exe
File opened for modification	C:\Program Files\SubDir	Client.exe
File created	C:\Program Files\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Program Files\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
2832	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2176	Client-built.exe
Token: SeDebugPrivilege	2780	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2780	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2780	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2176 wrote to memory of 2784	2176	Client-built.exe	30
PID 2176 wrote to memory of 2784	2176	Client-built.exe	30
PID 2176 wrote to memory of 2784	2176	Client-built.exe	30
PID 2176 wrote to memory of 2780	2176	Client-built.exe	32
PID 2176 wrote to memory of 2780	2176	Client-built.exe	32
PID 2176 wrote to memory of 2780	2176	Client-built.exe	32
PID 2780 wrote to memory of 2832	2780	Client.exe	33
PID 2780 wrote to memory of 2832	2780	Client.exe	33
PID 2780 wrote to memory of 2832	2780	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 Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2176
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2784
- C:\Program Files\SubDir\Client.exe
  "C:\Program Files\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in Program Files directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:2780
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2832

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:\Program Files\SubDir\Client.exe

Filesize
3.1MB

MD5
5d941424d5ea2bcacc9205837acc1dff

SHA1
dad94e588db27fb9afabce3831f2bf4f6ed1e8f2

SHA256
b42c4e3557412a2ec458d1e7e73501b84a9fcef3a9a0b5eed172d0af619c59c6

SHA512
f3ef395430ccb27ab7fbac3b8b120aac0d93ac605b09862bfa3085005e9e241e6deee3def80ed7d6c8ae7a1c46c93400ad97f0049e5f79aefb05e65a82d1dab4

Download Submit
memory/2176-0-0x000007FEF5E23000-0x000007FEF5E24000-memory.dmp

Filesize
4KB

Download
memory/2176-1-0x0000000000A30000-0x0000000000D54000-memory.dmp

Filesize
3.1MB

Download
memory/2176-2-0x000007FEF5E20000-0x000007FEF680C000-memory.dmp

Filesize
9.9MB

Download
memory/2176-8-0x000007FEF5E20000-0x000007FEF680C000-memory.dmp

Filesize
9.9MB

Download
memory/2780-10-0x0000000001230000-0x0000000001554000-memory.dmp

Filesize
3.1MB

Download
memory/2780-9-0x000007FEF5E20000-0x000007FEF680C000-memory.dmp

Filesize
9.9MB

Download
memory/2780-11-0x000007FEF5E20000-0x000007FEF680C000-memory.dmp

Filesize
9.9MB

Download
memory/2780-12-0x000007FEF5E20000-0x000007FEF680C000-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