quasar | 6e17449148526f2169e2d0fdcedd5f599b17e953b29662f74ca0f534ba44589b

General

Target

Client-built.exe
Size

3.1MB
MD5

9f363517377578ac3d7fbb253dcaaf8d
SHA1

d79d53e00bac8145fe06602fe1479d4770d31ab1
SHA256

6e17449148526f2169e2d0fdcedd5f599b17e953b29662f74ca0f534ba44589b
SHA512

0424519b17c3511124d8a7ab6b9e0700106ef01bb157ded9a99cbcb2b599e6f59ea7b235d35ebfe10c1836680eb449d719790641f72d5504232c4c2bd977e73f
SSDEEP

49152:rvCI22SsaNYfdPBldt698dBcjHXAWEpMf/GoGd+THHB72eh2NT:rvP22SsaNYfdPBldt6+dBcjHXAWE5

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

wexodi1642-33696.portmap.host:33696

Mutex

05043f17-0876-45f5-b27b-7f630638e515

Attributes

encryption_key
F4CF0CA55402CFB88BBBA236836AC2C8F476EAF1
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Steam
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/2904-1-0x0000000000090000-0x00000000003B4000-memory.dmp	family_quasar
behavioral1/files/0x0009000000015d64-6.dat	family_quasar
behavioral1/memory/2148-8-0x00000000000C0000-0x00000000003E4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2148	Client.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client.exe
File opened for modification	C:\Windows\system32\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
2232	schtasks.exe
2020	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2904	Client-built.exe
Token: SeDebugPrivilege	2148	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2148	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2148	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2904 wrote to memory of 2020	2904	Client-built.exe	31
PID 2904 wrote to memory of 2020	2904	Client-built.exe	31
PID 2904 wrote to memory of 2020	2904	Client-built.exe	31
PID 2904 wrote to memory of 2148	2904	Client-built.exe	33
PID 2904 wrote to memory of 2148	2904	Client-built.exe	33
PID 2904 wrote to memory of 2148	2904	Client-built.exe	33
PID 2148 wrote to memory of 2232	2148	Client.exe	34
PID 2148 wrote to memory of 2232	2148	Client.exe	34
PID 2148 wrote to memory of 2232	2148	Client.exe	34

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 System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2904
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Steam" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2020
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:2148
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Steam" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2232

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:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
9f363517377578ac3d7fbb253dcaaf8d

SHA1
d79d53e00bac8145fe06602fe1479d4770d31ab1

SHA256
6e17449148526f2169e2d0fdcedd5f599b17e953b29662f74ca0f534ba44589b

SHA512
0424519b17c3511124d8a7ab6b9e0700106ef01bb157ded9a99cbcb2b599e6f59ea7b235d35ebfe10c1836680eb449d719790641f72d5504232c4c2bd977e73f

Download Submit
memory/2148-8-0x00000000000C0000-0x00000000003E4000-memory.dmp

Filesize
3.1MB

Download
memory/2148-11-0x000007FEF5FA0000-0x000007FEF698C000-memory.dmp

Filesize
9.9MB

Download
memory/2148-10-0x000007FEF5FA0000-0x000007FEF698C000-memory.dmp

Filesize
9.9MB

Download
memory/2148-12-0x000007FEF5FA0000-0x000007FEF698C000-memory.dmp

Filesize
9.9MB

Download
memory/2904-0-0x000007FEF5FA3000-0x000007FEF5FA4000-memory.dmp

Filesize
4KB

Download
memory/2904-1-0x0000000000090000-0x00000000003B4000-memory.dmp

Filesize
3.1MB

Download
memory/2904-2-0x000007FEF5FA0000-0x000007FEF698C000-memory.dmp

Filesize
9.9MB

Download
memory/2904-9-0x000007FEF5FA0000-0x000007FEF698C000-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