quasar | 5c383cff50ac7c9f8ec2ac05464302885def4d389f6592340c23ade7eb5f5000

General

Target

5c383cff50ac7c9f8ec2ac05464302885def4d389f6592340c23ade7eb5f5000N.exe
Size

502KB
MD5

7f6ef73a37700d318d19912b27d0c760
SHA1

f8a3cb6f1359076955fa9a0729d09b8eb7fc60fd
SHA256

5c383cff50ac7c9f8ec2ac05464302885def4d389f6592340c23ade7eb5f5000
SHA512

8516266e89bbadf08841e9b17c673c5cbfdf76e754922f0db704261da08dae231f2902bff1f86c64ddb618290f8f00a731d0dce2de4b7522e78d584929848e51
SSDEEP

6144:cTEgdc0YzXAGbgiIN2RSBwbPdTEDIKBDkQfocE9Ob8F9PQ5BZcTR3+:cTEgdfYjbgnhDktpWTZcd+

Score

10^/10

quasar office spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

office

C2

192.168.147.1:4782

Mutex

fefeb1a4-7034-4293-a517-f90e7365e8e2

Attributes

encryption_key
4111EB4E3452F3046C6F5DFE90F84F08D3E1BB9C
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
036234237

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/5036-1-0x0000000000480000-0x0000000000504000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023ca0-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4416	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
3976	schtasks.exe
1584	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5036	5c383cff50ac7c9f8ec2ac05464302885def4d389f6592340c23ade7eb5f5000N.exe
Token: SeDebugPrivilege	4416	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4416	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4416	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4416	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5036 wrote to memory of 3976	5036	5c383cff50ac7c9f8ec2ac05464302885def4d389f6592340c23ade7eb5f5000N.exe	83
PID 5036 wrote to memory of 3976	5036	5c383cff50ac7c9f8ec2ac05464302885def4d389f6592340c23ade7eb5f5000N.exe	83
PID 5036 wrote to memory of 4416	5036	5c383cff50ac7c9f8ec2ac05464302885def4d389f6592340c23ade7eb5f5000N.exe	85
PID 5036 wrote to memory of 4416	5036	5c383cff50ac7c9f8ec2ac05464302885def4d389f6592340c23ade7eb5f5000N.exe	85
PID 4416 wrote to memory of 1584	4416	Client.exe	86
PID 4416 wrote to memory of 1584	4416	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\5c383cff50ac7c9f8ec2ac05464302885def4d389f6592340c23ade7eb5f5000N.exe
"C:\Users\Admin\AppData\Local\Temp\5c383cff50ac7c9f8ec2ac05464302885def4d389f6592340c23ade7eb5f5000N.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5036
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\5c383cff50ac7c9f8ec2ac05464302885def4d389f6592340c23ade7eb5f5000N.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3976
- C:\Users\Admin\AppData\Roaming\036234237\Client.exe
  "C:\Users\Admin\AppData\Roaming\036234237\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:4416
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\036234237\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1584

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\036234237\Client.exe

Filesize
502KB

MD5
7f6ef73a37700d318d19912b27d0c760

SHA1
f8a3cb6f1359076955fa9a0729d09b8eb7fc60fd

SHA256
5c383cff50ac7c9f8ec2ac05464302885def4d389f6592340c23ade7eb5f5000

SHA512
8516266e89bbadf08841e9b17c673c5cbfdf76e754922f0db704261da08dae231f2902bff1f86c64ddb618290f8f00a731d0dce2de4b7522e78d584929848e51

Download Submit
memory/4416-8-0x00007FFE76440000-0x00007FFE76F01000-memory.dmp

Filesize
10.8MB

Download
memory/4416-10-0x00007FFE76440000-0x00007FFE76F01000-memory.dmp

Filesize
10.8MB

Download
memory/4416-11-0x000000001BC90000-0x000000001BCE0000-memory.dmp

Filesize
320KB

Download
memory/4416-12-0x000000001BDA0000-0x000000001BE52000-memory.dmp

Filesize
712KB

Download
memory/4416-13-0x00007FFE76440000-0x00007FFE76F01000-memory.dmp

Filesize
10.8MB

Download
memory/5036-0-0x00007FFE76443000-0x00007FFE76445000-memory.dmp

Filesize
8KB

Download
memory/5036-1-0x0000000000480000-0x0000000000504000-memory.dmp

Filesize
528KB

Download
memory/5036-2-0x00007FFE76440000-0x00007FFE76F01000-memory.dmp

Filesize
10.8MB

Download
memory/5036-9-0x00007FFE76440000-0x00007FFE76F01000-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