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 2 IoCs

resource	yara_rule
behavioral1/memory/4896-1-0x00000000003D0000-0x00000000006F4000-memory.dmp	family_quasar
behavioral1/files/0x0007000000023cb6-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3596	Client.exe

Drops file in Program Files directory 5 IoCs

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

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
2276	schtasks.exe
2576	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4896	Client-built.exe
Token: SeDebugPrivilege	3596	Client.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
3596	Client.exe
3596	Client.exe

Suspicious use of SendNotifyMessage 2 IoCs

pid	Process
3596	Client.exe
3596	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4896 wrote to memory of 2276	4896	Client-built.exe	84
PID 4896 wrote to memory of 2276	4896	Client-built.exe	84
PID 4896 wrote to memory of 3596	4896	Client-built.exe	86
PID 4896 wrote to memory of 3596	4896	Client-built.exe	86
PID 3596 wrote to memory of 2576	3596	Client.exe	87
PID 3596 wrote to memory of 2576	3596	Client.exe	87

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:4896
- 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:2276
- 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:3596
- - 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:2576

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/3596-9-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp

Filesize
10.8MB

Download
memory/3596-11-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp

Filesize
10.8MB

Download
memory/3596-12-0x000000001C200000-0x000000001C250000-memory.dmp

Filesize
320KB

Download
memory/3596-13-0x000000001C310000-0x000000001C3C2000-memory.dmp

Filesize
712KB

Download
memory/3596-14-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp

Filesize
10.8MB

Download
memory/3596-17-0x000000001C250000-0x000000001C262000-memory.dmp

Filesize
72KB

Download
memory/3596-18-0x000000001C2B0000-0x000000001C2EC000-memory.dmp

Filesize
240KB

Download
memory/4896-0-0x00007FFD4F463000-0x00007FFD4F465000-memory.dmp

Filesize
8KB

Download
memory/4896-1-0x00000000003D0000-0x00000000006F4000-memory.dmp

Filesize
3.1MB

Download
memory/4896-2-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp

Filesize
10.8MB

Download
memory/4896-10-0x00007FFD4F460000-0x00007FFD4FF21000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads