quasar | ec1748bb524a5304d32d79ce0bde249c75d787812ad9a49bcd5d67a58c98859a

General

Target

Client-built.exe
Size

3.1MB
MD5

e60175e496024c929635816438b40fe2
SHA1

56a7bc169835945de5ac601426e720301141b144
SHA256

ec1748bb524a5304d32d79ce0bde249c75d787812ad9a49bcd5d67a58c98859a
SHA512

96bea0aec6b4822bbfe4bbc61d7d70dc27b18ccda3f85c7e8c9f8157235fc57812ccc305869d20df0ffe7bf34f1ba757c837752aad1ae0f5eddea95acc13c119
SSDEEP

49152:rvnI22SsaNYfdPBldt698dBcjH1ImebRjLoGdATHHB72eh2NT:rvI22SsaNYfdPBldt6+dBcjH1Ims

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.68.64:4782

Mutex

aac51872-c353-4334-af00-fe48eb068661

Attributes

encryption_key
6808A7D4497331E0215E1BD4F8BAFC9D1A6A08F0
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client 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/1656-1-0x0000000000C30000-0x0000000000F54000-memory.dmp	family_quasar
behavioral1/files/0x0008000000015e8f-6.dat	family_quasar
behavioral1/memory/2840-10-0x0000000000AA0000-0x0000000000DC4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2840	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
1900	schtasks.exe
1644	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1656	Client-built.exe
Token: SeDebugPrivilege	2840	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2840	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2840	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2840	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1656 wrote to memory of 1900	1656	Client-built.exe	28
PID 1656 wrote to memory of 1900	1656	Client-built.exe	28
PID 1656 wrote to memory of 1900	1656	Client-built.exe	28
PID 1656 wrote to memory of 2840	1656	Client-built.exe	30
PID 1656 wrote to memory of 2840	1656	Client-built.exe	30
PID 1656 wrote to memory of 2840	1656	Client-built.exe	30
PID 2840 wrote to memory of 1644	2840	Client.exe	31
PID 2840 wrote to memory of 1644	2840	Client.exe	31
PID 2840 wrote to memory of 1644	2840	Client.exe	31

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:1656
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1900
- 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:2840
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1644

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

Filesize
3.1MB

MD5
e60175e496024c929635816438b40fe2

SHA1
56a7bc169835945de5ac601426e720301141b144

SHA256
ec1748bb524a5304d32d79ce0bde249c75d787812ad9a49bcd5d67a58c98859a

SHA512
96bea0aec6b4822bbfe4bbc61d7d70dc27b18ccda3f85c7e8c9f8157235fc57812ccc305869d20df0ffe7bf34f1ba757c837752aad1ae0f5eddea95acc13c119

Download Submit
memory/1656-0-0x000007FEF5E13000-0x000007FEF5E14000-memory.dmp

Filesize
4KB

Download
memory/1656-1-0x0000000000C30000-0x0000000000F54000-memory.dmp

Filesize
3.1MB

Download
memory/1656-2-0x000007FEF5E10000-0x000007FEF67FC000-memory.dmp

Filesize
9.9MB

Download
memory/1656-8-0x000007FEF5E10000-0x000007FEF67FC000-memory.dmp

Filesize
9.9MB

Download
memory/2840-9-0x000007FEF5E10000-0x000007FEF67FC000-memory.dmp

Filesize
9.9MB

Download
memory/2840-10-0x0000000000AA0000-0x0000000000DC4000-memory.dmp

Filesize
3.1MB

Download
memory/2840-11-0x000007FEF5E10000-0x000007FEF67FC000-memory.dmp

Filesize
9.9MB

Download
memory/2840-12-0x000007FEF5E10000-0x000007FEF67FC000-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