quasar | 4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521

General

Target

4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe
Size

3.1MB
MD5

5c585cd5a2d292a0cb0be6b10cace921
SHA1

84b90137c36d741a4291aa22f4450c470ed9bd89
SHA256

4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521
SHA512

958c91d84c7e163fd473caf91363680347aa452aebdae76a4c01b39da790d003c20af6462bec3663c0208e8680ae2a9042fbc2c8ed8960e062dd51070fa39b27
SSDEEP

49152:avCI22SsaNYfdPBldt698dBcjHQCv1JSpoGdTvTHHB72eh2NT:avP22SsaNYfdPBldt6+dBcjHQCa

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

tieumao1995-51127.portmap.io:51127

Mutex

4119a2e0-4ae4-4843-8534-99af91a2475d

Attributes

encryption_key
DF6316067206E09C1F85138FCEBD56F5D94BF6AE
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
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/2932-1-0x0000000000C20000-0x0000000000F46000-memory.dmp	family_quasar
behavioral1/files/0x0008000000016d66-5.dat	family_quasar
behavioral1/memory/2896-8-0x0000000001390000-0x00000000016B6000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2896	Client.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
2108	schtasks.exe
2236	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2932	4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe
Token: SeDebugPrivilege	2896	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2896	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2896	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2896	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2932 wrote to memory of 2108	2932	4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe	30
PID 2932 wrote to memory of 2108	2932	4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe	30
PID 2932 wrote to memory of 2108	2932	4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe	30
PID 2932 wrote to memory of 2896	2932	4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe	32
PID 2932 wrote to memory of 2896	2932	4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe	32
PID 2932 wrote to memory of 2896	2932	4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe	32
PID 2896 wrote to memory of 2236	2896	Client.exe	33
PID 2896 wrote to memory of 2236	2896	Client.exe	33
PID 2896 wrote to memory of 2236	2896	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\4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe
"C:\Users\Admin\AppData\Local\Temp\4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2932
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2108
- 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:2896
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2236

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
3.1MB

MD5
5c585cd5a2d292a0cb0be6b10cace921

SHA1
84b90137c36d741a4291aa22f4450c470ed9bd89

SHA256
4c55655c8daeb51fb9592bfd3eb4e29e1a40fc89b13af090c52cbcd4b6390521

SHA512
958c91d84c7e163fd473caf91363680347aa452aebdae76a4c01b39da790d003c20af6462bec3663c0208e8680ae2a9042fbc2c8ed8960e062dd51070fa39b27

Download Submit
memory/2896-8-0x0000000001390000-0x00000000016B6000-memory.dmp

Filesize
3.1MB

Download
memory/2896-10-0x000007FEF6170000-0x000007FEF6B5C000-memory.dmp

Filesize
9.9MB

Download
memory/2896-9-0x000007FEF6170000-0x000007FEF6B5C000-memory.dmp

Filesize
9.9MB

Download
memory/2896-11-0x000007FEF6170000-0x000007FEF6B5C000-memory.dmp

Filesize
9.9MB

Download
memory/2932-0-0x000007FEF6173000-0x000007FEF6174000-memory.dmp

Filesize
4KB

Download
memory/2932-1-0x0000000000C20000-0x0000000000F46000-memory.dmp

Filesize
3.1MB

Download
memory/2932-2-0x000007FEF6170000-0x000007FEF6B5C000-memory.dmp

Filesize
9.9MB

Download
memory/2932-7-0x000007FEF6170000-0x000007FEF6B5C000-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