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 2 IoCs

resource	yara_rule
behavioral2/memory/4836-1-0x0000000000190000-0x00000000004E2000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c9b-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2924	Client.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
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
File opened for modification	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
4640	schtasks.exe
1456	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4836	90IYB_Client-built.exe
Token: SeDebugPrivilege	2924	Client.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
2924	Client.exe
2924	Client.exe

Suspicious use of SendNotifyMessage 2 IoCs

pid	Process
2924	Client.exe
2924	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4836 wrote to memory of 4640	4836	90IYB_Client-built.exe	83
PID 4836 wrote to memory of 4640	4836	90IYB_Client-built.exe	83
PID 4836 wrote to memory of 2924	4836	90IYB_Client-built.exe	85
PID 4836 wrote to memory of 2924	4836	90IYB_Client-built.exe	85
PID 2924 wrote to memory of 1456	2924	Client.exe	86
PID 2924 wrote to memory of 1456	2924	Client.exe	86

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:4836
- 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:4640
- 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:2924
- - 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:1456

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/2924-9-0x00007FFAD9D80000-0x00007FFADA841000-memory.dmp

Filesize
10.8MB

Download
memory/2924-11-0x00007FFAD9D80000-0x00007FFADA841000-memory.dmp

Filesize
10.8MB

Download
memory/2924-12-0x0000000002860000-0x00000000028B0000-memory.dmp

Filesize
320KB

Download
memory/2924-13-0x000000001BC10000-0x000000001BCC2000-memory.dmp

Filesize
712KB

Download
memory/2924-16-0x0000000002A00000-0x0000000002A12000-memory.dmp

Filesize
72KB

Download
memory/2924-17-0x000000001BB50000-0x000000001BB8C000-memory.dmp

Filesize
240KB

Download
memory/2924-18-0x00007FFAD9D80000-0x00007FFADA841000-memory.dmp

Filesize
10.8MB

Download
memory/4836-0-0x00007FFAD9D83000-0x00007FFAD9D85000-memory.dmp

Filesize
8KB

Download
memory/4836-1-0x0000000000190000-0x00000000004E2000-memory.dmp

Filesize
3.3MB

Download
memory/4836-2-0x00007FFAD9D80000-0x00007FFADA841000-memory.dmp

Filesize
10.8MB

Download
memory/4836-10-0x00007FFAD9D80000-0x00007FFADA841000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads