quasar | 6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e

General

Target

6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e.exe
Size

502KB
MD5

71685fb1a3701f1e27e48ba3e3ce9530
SHA1

f460a9ecc7e35b4691532bc6c647dbe3973a51ca
SHA256

6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e
SHA512

3a7505c3faacf6f3e113570545767757d2db5aa342023a4eea27e49e4d632a0064a957c6b07f950e727dd71b8262b768626521cf1d1fbb195fd36d7db7bf5c5a
SSDEEP

12288:9TEgdfY2xUJkhPPck43yw7VpDZx68Vcde:eUwtOoyw7VpDZdcde

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.0

Botnet

Office04

C2

137.184.144.245:4782

Mutex

6cfe4a65-c41d-4b02-9ae9-e727a748ae84

Attributes

encryption_key
B702BA239316FCF317B584A351F2EC1696EBE772
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
java updater
subdirectory
SubDir

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/728-1-0x0000000000D40000-0x0000000000DC4000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c86-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3632	Client.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e.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
2344	schtasks.exe
4196	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	728	6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e.exe
Token: SeDebugPrivilege	3632	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3632	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3632	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3632	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 728 wrote to memory of 2344	728	6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e.exe	83
PID 728 wrote to memory of 2344	728	6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e.exe	83
PID 728 wrote to memory of 3632	728	6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e.exe	85
PID 728 wrote to memory of 3632	728	6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e.exe	85
PID 3632 wrote to memory of 4196	3632	Client.exe	86
PID 3632 wrote to memory of 4196	3632	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\6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e.exe
"C:\Users\Admin\AppData\Local\Temp\6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:728
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2344
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\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:3632
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "java updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4196

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:\Windows\System32\SubDir\Client.exe

Filesize
502KB

MD5
71685fb1a3701f1e27e48ba3e3ce9530

SHA1
f460a9ecc7e35b4691532bc6c647dbe3973a51ca

SHA256
6600b4938a679ecd93d6149fb3f8fe74c8b347106de55a4853a76ae7a204950e

SHA512
3a7505c3faacf6f3e113570545767757d2db5aa342023a4eea27e49e4d632a0064a957c6b07f950e727dd71b8262b768626521cf1d1fbb195fd36d7db7bf5c5a

Download Submit
memory/728-0-0x00007FF9E2CE3000-0x00007FF9E2CE5000-memory.dmp

Filesize
8KB

Download
memory/728-1-0x0000000000D40000-0x0000000000DC4000-memory.dmp

Filesize
528KB

Download
memory/728-2-0x00007FF9E2CE0000-0x00007FF9E37A1000-memory.dmp

Filesize
10.8MB

Download
memory/728-9-0x00007FF9E2CE0000-0x00007FF9E37A1000-memory.dmp

Filesize
10.8MB

Download
memory/3632-7-0x00007FF9E2CE0000-0x00007FF9E37A1000-memory.dmp

Filesize
10.8MB

Download
memory/3632-10-0x00007FF9E2CE0000-0x00007FF9E37A1000-memory.dmp

Filesize
10.8MB

Download
memory/3632-11-0x000000001BD30000-0x000000001BD80000-memory.dmp

Filesize
320KB

Download
memory/3632-12-0x000000001BE40000-0x000000001BEF2000-memory.dmp

Filesize
712KB

Download
memory/3632-13-0x00007FF9E2CE0000-0x00007FF9E37A1000-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