quasar | 1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc

General

Target

1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc.exe
Size

4.7MB
MD5

ebe00803d4c9351a90a338c9d0f10f1a
SHA1

f0afa3c734f00ba9b3a3b406e78e5280abc7aa4c
SHA256

1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc
SHA512

b0166984e12a553986bce8e5e1343a2c4dba5d8c9d34158448f9aa7cf5412c5a3afe53801e2047569eca3ad2fb9a1e14ee3ee8f6c41669f139f8babf26cc28b6
SSDEEP

98304:v3ZRzWRZvr22SsaNYfdPBldt6+dBcjHtKRJ6BxIbzZCIbzZY:rEM7jGIefK

Score

10^/10

quasar office04 discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

mx5.deitie.asia:4495

Mutex

ebbf737a-dddd-43dd-9b0a-74831302455d

Attributes

encryption_key
F8516D89A1DFD78BD8FF575BBC3AE828B47FF0E1
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 2 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe	family_quasar
behavioral2/memory/412-5-0x00000000002A0000-0x00000000005C4000-memory.dmp	family_quasar

Drops startup file 1 IoCs

Processes:

1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe	1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc.exe

Executes dropped EXE 2 IoCs

Processes:

sign.exeClient.exe

pid process

412 sign.exe
4280 Client.exe

pid	process
412	sign.exe
4280	Client.exe

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc.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

4992 schtasks.exe
4940 schtasks.exe

pid	process
4992	schtasks.exe
4940	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc.exe

pid	process
3992	1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc.exe
3992	1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

sign.exeClient.exe

description pid process

Token: SeDebugPrivilege 412 sign.exe
Token: SeDebugPrivilege 4280 Client.exe

description	pid	process
Token: SeDebugPrivilege	412	sign.exe
Token: SeDebugPrivilege	4280	Client.exe

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc.exe

pid	process
3992	1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc.exe
3992	1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc.exesign.exeClient.exe

description	pid	process	target process
PID 3992 wrote to memory of 412	3992	1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc.exe	sign.exe
PID 3992 wrote to memory of 412	3992	1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc.exe	sign.exe
PID 412 wrote to memory of 4992	412	sign.exe	schtasks.exe
PID 412 wrote to memory of 4992	412	sign.exe	schtasks.exe
PID 412 wrote to memory of 4280	412	sign.exe	Client.exe
PID 412 wrote to memory of 4280	412	sign.exe	Client.exe
PID 4280 wrote to memory of 4940	4280	Client.exe	schtasks.exe
PID 4280 wrote to memory of 4940	4280	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\1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc.exe
"C:\Users\Admin\AppData\Local\Temp\1e2eeb66d4da9c9c4111c60fe18184d5b864a2e2708999e8e68cc04239a57ecc.exe"
1⤵
- Drops startup file
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3992
- C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe
  "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\\sign.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:412
- - 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:4992
- - C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4280
  - - 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
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4940

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 Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\sign.exe

Filesize
3.1MB

MD5
7498d554976744dfbd271ba755c6c192

SHA1
ec733d01e776518e387d2f51d1a6559b81f03b1e

SHA256
44089202623b9671051aa5bba5e72f81f68ce818c3054dde57726aaa6dcb9ff7

SHA512
d4e987d0e6235001fac4ae3a634e8fe98c6830e26a6a6876fbc36262842688d3ec301cff75003d2af695cdfd357ac50919946695b7d5d3293ebcba97153e1030

Download Submit
memory/412-4-0x00007FFEF6153000-0x00007FFEF6155000-memory.dmp

Filesize
8KB

Download
memory/412-5-0x00000000002A0000-0x00000000005C4000-memory.dmp

Filesize
3.1MB

Download
memory/412-6-0x00007FFEF6150000-0x00007FFEF6C11000-memory.dmp

Filesize
10.8MB

Download
memory/412-14-0x00007FFEF6150000-0x00007FFEF6C11000-memory.dmp

Filesize
10.8MB

Download
memory/4280-13-0x00007FFEF6150000-0x00007FFEF6C11000-memory.dmp

Filesize
10.8MB

Download
memory/4280-15-0x000000001BAD0000-0x000000001BB20000-memory.dmp

Filesize
320KB

Download
memory/4280-16-0x000000001C0F0000-0x000000001C1A2000-memory.dmp

Filesize
712KB

Download
memory/4280-17-0x00007FFEF6150000-0x00007FFEF6C11000-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