quasar | 1e9796e9439e51cac6936a87fb043cf85d837ece6f26e383bb39e68e1a40d3e5

Analysis

max time kernel
70s
max time network
73s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
16-12-2024 15:22

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General

Target

Client-built.exe
Size

3.1MB
MD5

4cc332d69d4f37340aabf54173ae8365
SHA1

072242c54690924193b29fe8ffb046bef8d393a1
SHA256

1e9796e9439e51cac6936a87fb043cf85d837ece6f26e383bb39e68e1a40d3e5
SHA512

50817fb9f83135156b79b97aa64c753be3495195f16f6acf456961669b4a09b6862dce4da77f61af4cbf01acc0d580d7fde106642098c6291a0982b407f29905
SSDEEP

49152:CvmI22SsaNYfdPBldt698dBcjHsCS1JmLoGd1THHB72eh2NT:Cvr22SsaNYfdPBldt6+dBcjHsC1

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

5.20.104.111:4782

Mutex

beca179f-e7d8-40de-ba85-d1fd906529dd

Attributes

encryption_key
66CB84A8DB676E9F5F54FDDB146D727FB936CCFD
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Microsoft Defender
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
behavioral1/memory/4248-1-0x0000000000D10000-0x0000000001034000-memory.dmp	family_quasar
behavioral1/files/0x001b00000002aa77-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3404	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

pid	Process
3964	schtasks.exe
2192	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4248	Client-built.exe
Token: SeDebugPrivilege	3404	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4248 wrote to memory of 2192	4248	Client-built.exe	77
PID 4248 wrote to memory of 2192	4248	Client-built.exe	77
PID 4248 wrote to memory of 3404	4248	Client-built.exe	79
PID 4248 wrote to memory of 3404	4248	Client-built.exe	79
PID 3404 wrote to memory of 3964	3404	Client.exe	80
PID 3404 wrote to memory of 3964	3404	Client.exe	80

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:4248
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Microsoft Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2192
- 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 WriteProcessMemory
  PID:3404
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Microsoft Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3964

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:4328

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

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
4cc332d69d4f37340aabf54173ae8365

SHA1
072242c54690924193b29fe8ffb046bef8d393a1

SHA256
1e9796e9439e51cac6936a87fb043cf85d837ece6f26e383bb39e68e1a40d3e5

SHA512
50817fb9f83135156b79b97aa64c753be3495195f16f6acf456961669b4a09b6862dce4da77f61af4cbf01acc0d580d7fde106642098c6291a0982b407f29905

Download Submit
memory/3404-10-0x00007FF8ECA50000-0x00007FF8ED512000-memory.dmp

Filesize
10.8MB

Download
memory/3404-11-0x00007FF8ECA50000-0x00007FF8ED512000-memory.dmp

Filesize
10.8MB

Download
memory/3404-12-0x000000001BCF0000-0x000000001BD40000-memory.dmp

Filesize
320KB

Download
memory/3404-13-0x000000001C930000-0x000000001C9E2000-memory.dmp

Filesize
712KB

Download
memory/3404-14-0x00007FF8ECA50000-0x00007FF8ED512000-memory.dmp

Filesize
10.8MB

Download
memory/4248-0-0x00007FF8ECA53000-0x00007FF8ECA55000-memory.dmp

Filesize
8KB

Download
memory/4248-1-0x0000000000D10000-0x0000000001034000-memory.dmp

Filesize
3.1MB

Download
memory/4248-2-0x00007FF8ECA50000-0x00007FF8ED512000-memory.dmp

Filesize
10.8MB

Download
memory/4248-9-0x00007FF8ECA50000-0x00007FF8ED512000-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