quasar | 05cdc11f58a3ebde589ad04a1ab071522b946261092d5bd47fb7a8971593f4aa

General

Target

90IYB_Client-built.exe
Size

3.3MB
MD5

8c5730b295d95613fffd0b6d45ccbf3b
SHA1

4db0f81fd90a0d4a1a5fb3814fb41b4018a2c9c3
SHA256

05cdc11f58a3ebde589ad04a1ab071522b946261092d5bd47fb7a8971593f4aa
SHA512

91d1a5e8043b5bcb205098644ddeef5eb87d0532ef404e03a8f44ad0731008f28303982afcbb1f6616822096de8aba759182a2d1a74cc2020f70597e71f29db2
SSDEEP

49152:wvuI22SsaNYfdPBldt698dBcjHpMWoeBxbaoGdsTHHB72eh2NTN:wvD22SsaNYfdPBldt6+dBcjHzo7

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

45.200.148.155:6060

Mutex

4b3820e0-d123-49d9-b51e-3c4daa4f6874

Attributes

encryption_key
F8879E9B26846C57C99B6F152F74703E1CC15B8B
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
SecurityHealthSystray.exe
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/2156-1-0x0000000000860000-0x0000000000BB2000-memory.dmp	family_quasar
behavioral1/files/0x0008000000016d36-6.dat	family_quasar
behavioral1/memory/2360-9-0x0000000000050000-0x00000000003A2000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2360	Client.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\SubDir\Client.exe	90IYB_Client-built.exe
File opened for modification	C:\Windows\system32\SubDir	90IYB_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
File created	C:\Windows\system32\SubDir\Client.exe	90IYB_Client-built.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
2412	schtasks.exe
2416	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2156	90IYB_Client-built.exe
Token: SeDebugPrivilege	2360	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2360	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2360	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2156 wrote to memory of 2412	2156	90IYB_Client-built.exe	30
PID 2156 wrote to memory of 2412	2156	90IYB_Client-built.exe	30
PID 2156 wrote to memory of 2412	2156	90IYB_Client-built.exe	30
PID 2156 wrote to memory of 2360	2156	90IYB_Client-built.exe	32
PID 2156 wrote to memory of 2360	2156	90IYB_Client-built.exe	32
PID 2156 wrote to memory of 2360	2156	90IYB_Client-built.exe	32
PID 2360 wrote to memory of 2416	2360	Client.exe	33
PID 2360 wrote to memory of 2416	2360	Client.exe	33
PID 2360 wrote to memory of 2416	2360	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\90IYB_Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\90IYB_Client-built.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2156
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "SecurityHealthSystray.exe" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2412
- 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:2360
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "SecurityHealthSystray.exe" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2416

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:\Windows\System32\SubDir\Client.exe

Filesize
3.3MB

MD5
8c5730b295d95613fffd0b6d45ccbf3b

SHA1
4db0f81fd90a0d4a1a5fb3814fb41b4018a2c9c3

SHA256
05cdc11f58a3ebde589ad04a1ab071522b946261092d5bd47fb7a8971593f4aa

SHA512
91d1a5e8043b5bcb205098644ddeef5eb87d0532ef404e03a8f44ad0731008f28303982afcbb1f6616822096de8aba759182a2d1a74cc2020f70597e71f29db2

Download Submit
memory/2156-0-0x000007FEF5993000-0x000007FEF5994000-memory.dmp

Filesize
4KB

Download
memory/2156-1-0x0000000000860000-0x0000000000BB2000-memory.dmp

Filesize
3.3MB

Download
memory/2156-2-0x000007FEF5990000-0x000007FEF637C000-memory.dmp

Filesize
9.9MB

Download
memory/2156-8-0x000007FEF5990000-0x000007FEF637C000-memory.dmp

Filesize
9.9MB

Download
memory/2360-10-0x000007FEF5990000-0x000007FEF637C000-memory.dmp

Filesize
9.9MB

Download
memory/2360-9-0x0000000000050000-0x00000000003A2000-memory.dmp

Filesize
3.3MB

Download
memory/2360-11-0x000007FEF5990000-0x000007FEF637C000-memory.dmp

Filesize
9.9MB

Download
memory/2360-12-0x000007FEF5990000-0x000007FEF637C000-memory.dmp

Filesize
9.9MB

Download
memory/2360-13-0x000007FEF5990000-0x000007FEF637C000-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