quasar | 72779331ccef1ecb19122b72a2a2745b2c6f46d3b2f811d6cdfd361969408b13

General

Target

Client-built.exe
Size

3.2MB
MD5

8bb05d28fb2de6c00e4f9237cb9d3ce9
SHA1

14507bff45cf98227291084caf8d2994027e4d91
SHA256

72779331ccef1ecb19122b72a2a2745b2c6f46d3b2f811d6cdfd361969408b13
SHA512

cb28635b80bd62974559a3983f97e693b07d0b98c2ea7c4f88a7f51299500689f08dd47953e9550c206021b9779f3676920416962d7a07594e2c10a5e717e782
SSDEEP

49152:Yvht62XlaSFNWPjljiFa2RoUYI9cUZxoGtvAoTHHB72eh2NTx:YvL62XlaSFNWPjljiFXRoUYI9cw3

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.208.1:4782

Mutex

3f84c085-3a8d-4b82-9872-c704d7977ad0

Attributes

encryption_key
69B752FA4F70AC7EF5AE67EAE90277065B69315A
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Exam
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/2192-1-0x0000000000CA0000-0x0000000000FD0000-memory.dmp	family_quasar
behavioral1/files/0x0030000000016689-7.dat	family_quasar
behavioral1/memory/2740-10-0x0000000000A90000-0x0000000000DC0000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2740	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
2796	schtasks.exe
2864	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2192	Client-built.exe
Token: SeDebugPrivilege	2740	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2740	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2740	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2740	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2192 wrote to memory of 2796	2192	Client-built.exe	30
PID 2192 wrote to memory of 2796	2192	Client-built.exe	30
PID 2192 wrote to memory of 2796	2192	Client-built.exe	30
PID 2192 wrote to memory of 2740	2192	Client-built.exe	32
PID 2192 wrote to memory of 2740	2192	Client-built.exe	32
PID 2192 wrote to memory of 2740	2192	Client-built.exe	32
PID 2740 wrote to memory of 2864	2740	Client.exe	33
PID 2740 wrote to memory of 2864	2740	Client.exe	33
PID 2740 wrote to memory of 2864	2740	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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2192
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Exam" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2796
- 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:2740
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Exam" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2864

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
3.2MB

MD5
8bb05d28fb2de6c00e4f9237cb9d3ce9

SHA1
14507bff45cf98227291084caf8d2994027e4d91

SHA256
72779331ccef1ecb19122b72a2a2745b2c6f46d3b2f811d6cdfd361969408b13

SHA512
cb28635b80bd62974559a3983f97e693b07d0b98c2ea7c4f88a7f51299500689f08dd47953e9550c206021b9779f3676920416962d7a07594e2c10a5e717e782

Download Submit
memory/2192-0-0x000007FEF5063000-0x000007FEF5064000-memory.dmp

Filesize
4KB

Download
memory/2192-1-0x0000000000CA0000-0x0000000000FD0000-memory.dmp

Filesize
3.2MB

Download
memory/2192-2-0x000007FEF5060000-0x000007FEF5A4C000-memory.dmp

Filesize
9.9MB

Download
memory/2192-9-0x000007FEF5060000-0x000007FEF5A4C000-memory.dmp

Filesize
9.9MB

Download
memory/2740-8-0x000007FEF5060000-0x000007FEF5A4C000-memory.dmp

Filesize
9.9MB

Download
memory/2740-10-0x0000000000A90000-0x0000000000DC0000-memory.dmp

Filesize
3.2MB

Download
memory/2740-11-0x000007FEF5060000-0x000007FEF5A4C000-memory.dmp

Filesize
9.9MB

Download
memory/2740-12-0x000007FEF5060000-0x000007FEF5A4C000-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