quasar | e98b1dbab728749f570394ce8b74ec14fc323dcefdb7cabd6d93da22e7bffe9f

General

Target

Client-built.exe
Size

348KB
MD5

2ba09f53e30ef8c5d76398627edc43d1
SHA1

1fe3307b985972b457abcf9f2152164699afa208
SHA256

e98b1dbab728749f570394ce8b74ec14fc323dcefdb7cabd6d93da22e7bffe9f
SHA512

2a6f2da1f92b10cf7d244e744496777539b96e2d5ced8e6ac2a6ddaad96c5418b70e5d6639bafb4787c9d6dcecff00cb1edca0680584899be7a5808223af0a4c
SSDEEP

6144:7bwb/c2L0tkuj4xcwYrbgkl8MQ/LlHvsrROO:HH2Le8x9YAkl4/LNvsQO

Score

10^/10

quasar clint discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

Clint

C2

192.168.178.29:4780

192.168.178.29:4782

Mutex

QSR_MUTEX_02VEKG7zCDubNpN0wF

Attributes

encryption_key
yNBSWqkrzBAexUKe7XeZ
install_name
robloxfisch.exe
log_directory
Log
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/3068-1-0x00000000000F0000-0x000000000014E000-memory.dmp	family_quasar
behavioral1/files/0x0036000000015f81-4.dat	family_quasar
behavioral1/memory/2720-10-0x0000000000F10000-0x0000000000F6E000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2720	robloxfisch.exe

Loads dropped DLL 1 IoCs

pid	Process
3068	Client-built.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
2	ip-api.com

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\SubDir\robloxfisch.exe	Client-built.exe
File opened for modification	C:\Windows\SysWOW64\SubDir\robloxfisch.exe	Client-built.exe

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Client-built.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	robloxfisch.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
2612	schtasks.exe
2860	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3068	Client-built.exe
Token: SeDebugPrivilege	2720	robloxfisch.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2720	robloxfisch.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 3068 wrote to memory of 2860	3068	Client-built.exe	31
PID 3068 wrote to memory of 2860	3068	Client-built.exe	31
PID 3068 wrote to memory of 2860	3068	Client-built.exe	31
PID 3068 wrote to memory of 2860	3068	Client-built.exe	31
PID 3068 wrote to memory of 2720	3068	Client-built.exe	33
PID 3068 wrote to memory of 2720	3068	Client-built.exe	33
PID 3068 wrote to memory of 2720	3068	Client-built.exe	33
PID 3068 wrote to memory of 2720	3068	Client-built.exe	33
PID 2720 wrote to memory of 2612	2720	robloxfisch.exe	34
PID 2720 wrote to memory of 2612	2720	robloxfisch.exe	34
PID 2720 wrote to memory of 2612	2720	robloxfisch.exe	34
PID 2720 wrote to memory of 2612	2720	robloxfisch.exe	34

C:\Users\Admin\AppData\Local\Temp\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Loads dropped DLL
- Drops file in System32 directory
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3068
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:2860
- C:\Windows\SysWOW64\SubDir\robloxfisch.exe
  "C:\Windows\SysWOW64\SubDir\robloxfisch.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2720
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\SysWOW64\SubDir\robloxfisch.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2612

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

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

\Windows\SysWOW64\SubDir\robloxfisch.exe

Filesize
348KB

MD5
2ba09f53e30ef8c5d76398627edc43d1

SHA1
1fe3307b985972b457abcf9f2152164699afa208

SHA256
e98b1dbab728749f570394ce8b74ec14fc323dcefdb7cabd6d93da22e7bffe9f

SHA512
2a6f2da1f92b10cf7d244e744496777539b96e2d5ced8e6ac2a6ddaad96c5418b70e5d6639bafb4787c9d6dcecff00cb1edca0680584899be7a5808223af0a4c

Download Submit
memory/2720-9-0x0000000074910000-0x0000000074FFE000-memory.dmp

Filesize
6.9MB

Download
memory/2720-10-0x0000000000F10000-0x0000000000F6E000-memory.dmp

Filesize
376KB

Download
memory/2720-11-0x0000000074910000-0x0000000074FFE000-memory.dmp

Filesize
6.9MB

Download
memory/3068-0-0x000000007491E000-0x000000007491F000-memory.dmp

Filesize
4KB

Download
memory/3068-1-0x00000000000F0000-0x000000000014E000-memory.dmp

Filesize
376KB

Download
memory/3068-2-0x0000000074910000-0x0000000074FFE000-memory.dmp

Filesize
6.9MB

Download
memory/3068-12-0x0000000074910000-0x0000000074FFE000-memory.dmp

Filesize
6.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads