quasar | e4a7526ba0307eafbdf3d9ce7c5fb335fb76989a480f05de0f928d47808d5595

General

Target

Client-built.exe
Size

3.1MB
MD5

5c90e91232e7e16804a5e2512f56ef0f
SHA1

0f5533f772a53f8a96710a1812d05c5db276d999
SHA256

e4a7526ba0307eafbdf3d9ce7c5fb335fb76989a480f05de0f928d47808d5595
SHA512

a96fe2661c18d59a6f84bfeae75eeae0db847b559808cd1f2a2485d3c651cea547a18af1435a5c3f855f31cec7b114ced112ad27b0f7f99abc751a090ff1ebc0
SSDEEP

49152:Svkt62XlaSFNWPjljiFa2RoUYIk7waT5p+Vk/3LoGdjTHHB72eh2NT:Sv462XlaSFNWPjljiFXRoUYIzaD

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

10.0.2.15:4782

Mutex

d850957b-64bd-497d-9f9a-3ee4894ffc1e

Attributes

encryption_key
8F0072332E1ACC25777BCA859650B335CCE8B039
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Discord
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2224-1-0x0000000000FD0000-0x00000000012F4000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
behavioral1/memory/1712-9-0x0000000000BE0000-0x0000000000F04000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

1712 Client.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

Processes:

schtasks.exeschtasks.exe

pid process

780 schtasks.exe
2624 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description pid process

Token: SeDebugPrivilege 2224 Client-built.exe
Token: SeDebugPrivilege 1712 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

1712 Client.exe

pid	process
1712	Client.exe

pid	process
780	schtasks.exe
2624	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2224	Client-built.exe
Token: SeDebugPrivilege	1712	Client.exe

pid	process
1712	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-built.exeClient.exe

description	pid	process	target process
PID 2224 wrote to memory of 2624	2224	Client-built.exe	schtasks.exe
PID 2224 wrote to memory of 2624	2224	Client-built.exe	schtasks.exe
PID 2224 wrote to memory of 2624	2224	Client-built.exe	schtasks.exe
PID 2224 wrote to memory of 1712	2224	Client-built.exe	Client.exe
PID 2224 wrote to memory of 1712	2224	Client-built.exe	Client.exe
PID 2224 wrote to memory of 1712	2224	Client-built.exe	Client.exe
PID 1712 wrote to memory of 780	1712	Client.exe	schtasks.exe
PID 1712 wrote to memory of 780	1712	Client.exe	schtasks.exe
PID 1712 wrote to memory of 780	1712	Client.exe	schtasks.exe

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:2224
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Discord" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2624
- 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 SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1712
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Discord" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:780

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

Filesize
3.1MB

MD5
5c90e91232e7e16804a5e2512f56ef0f

SHA1
0f5533f772a53f8a96710a1812d05c5db276d999

SHA256
e4a7526ba0307eafbdf3d9ce7c5fb335fb76989a480f05de0f928d47808d5595

SHA512
a96fe2661c18d59a6f84bfeae75eeae0db847b559808cd1f2a2485d3c651cea547a18af1435a5c3f855f31cec7b114ced112ad27b0f7f99abc751a090ff1ebc0

Download Submit
memory/1712-9-0x0000000000BE0000-0x0000000000F04000-memory.dmp

Filesize
3.1MB

Download
memory/1712-10-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

Filesize
9.9MB

Download
memory/1712-11-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

Filesize
9.9MB

Download
memory/1712-12-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

Filesize
9.9MB

Download
memory/2224-0-0x000007FEF52A3000-0x000007FEF52A4000-memory.dmp

Filesize
4KB

Download
memory/2224-1-0x0000000000FD0000-0x00000000012F4000-memory.dmp

Filesize
3.1MB

Download
memory/2224-2-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

Filesize
9.9MB

Download
memory/2224-8-0x000007FEF52A0000-0x000007FEF5C8C000-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