quasar | 597a26bc8399acff834bbce2ccbe7d5bab0e190e7f9163c2bce5feacc7f77ee9

General

Target

Client-built.exe
Size

3.1MB
MD5

671df8e1c2f83f10f1cfb3f447299806
SHA1

9586ee12e49e5fbac96adfd5f3d59e4dfb8393f0
SHA256

597a26bc8399acff834bbce2ccbe7d5bab0e190e7f9163c2bce5feacc7f77ee9
SHA512

097a01e399d7527b0fc2bf952e7153d56b255897ef3f219cbd32938072d4ea66e62894d66f6b0ca80fbfda5c02738497d60c2ea415b0f900941a9c3121619690
SSDEEP

49152:3v3I22SsaNYfdPBldt698dBcjHrExNESEok/iTLoGd3ITHHB72eh2NT:3v422SsaNYfdPBldt6+dBcjHAxrf

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.0.18:4782

Mutex

44193681-10d5-4b16-9270-2c8ec974b704

Attributes

encryption_key
1F1F096D9E0048372D789D0F2D073EB8FE99A5E0
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/2464-1-0x0000000000D20000-0x0000000001044000-memory.dmp	family_quasar
behavioral1/files/0x0008000000016d18-5.dat	family_quasar
behavioral1/memory/2920-8-0x0000000000B40000-0x0000000000E64000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2920	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
2056	schtasks.exe
2400	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2464	Client-built.exe
Token: SeDebugPrivilege	2920	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2920	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2920	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2464 wrote to memory of 2056	2464	Client-built.exe	31
PID 2464 wrote to memory of 2056	2464	Client-built.exe	31
PID 2464 wrote to memory of 2056	2464	Client-built.exe	31
PID 2464 wrote to memory of 2920	2464	Client-built.exe	33
PID 2464 wrote to memory of 2920	2464	Client-built.exe	33
PID 2464 wrote to memory of 2920	2464	Client-built.exe	33
PID 2920 wrote to memory of 2400	2920	Client.exe	34
PID 2920 wrote to memory of 2400	2920	Client.exe	34
PID 2920 wrote to memory of 2400	2920	Client.exe	34

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:2464
- 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:2056
- 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 WriteProcessMemory
  PID:2920
- - 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:2400

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
671df8e1c2f83f10f1cfb3f447299806

SHA1
9586ee12e49e5fbac96adfd5f3d59e4dfb8393f0

SHA256
597a26bc8399acff834bbce2ccbe7d5bab0e190e7f9163c2bce5feacc7f77ee9

SHA512
097a01e399d7527b0fc2bf952e7153d56b255897ef3f219cbd32938072d4ea66e62894d66f6b0ca80fbfda5c02738497d60c2ea415b0f900941a9c3121619690

Download Submit
memory/2464-0-0x000007FEF6033000-0x000007FEF6034000-memory.dmp

Filesize
4KB

Download
memory/2464-1-0x0000000000D20000-0x0000000001044000-memory.dmp

Filesize
3.1MB

Download
memory/2464-2-0x000007FEF6030000-0x000007FEF6A1C000-memory.dmp

Filesize
9.9MB

Download
memory/2464-9-0x000007FEF6030000-0x000007FEF6A1C000-memory.dmp

Filesize
9.9MB

Download
memory/2920-7-0x000007FEF6030000-0x000007FEF6A1C000-memory.dmp

Filesize
9.9MB

Download
memory/2920-8-0x0000000000B40000-0x0000000000E64000-memory.dmp

Filesize
3.1MB

Download
memory/2920-10-0x000007FEF6030000-0x000007FEF6A1C000-memory.dmp

Filesize
9.9MB

Download
memory/2920-11-0x000007FEF6030000-0x000007FEF6A1C000-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