quasar | e843601fcf7ac35515d0478e9ffa7e989826405389ada46b4627e26bc4d1fdfe

Analysis

max time kernel
150s
max time network
135s
platform
windows7_x64
resource
win7-20241023-en
resource tags

arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
submitted
29/12/2024, 21:03

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General

Target

Client-built.exe
Size

3.1MB
MD5

e34ce1e492d0a57ec3997512039793c9
SHA1

d3ec7bfd2d7f676adede7195db6c1a679d5c06a8
SHA256

e843601fcf7ac35515d0478e9ffa7e989826405389ada46b4627e26bc4d1fdfe
SHA512

00cd5d896efaaba657f3d5e917d43ff4360bb3e5d2779abf8b468b8526fed8e5ae22285f6e42c2c9f2e6155cde3049e87a855a5405be2cfaf23561acad96a7fe
SSDEEP

49152:yvyI22SsaNYfdPBldt698dBcjHNzRJ6tbR3LoGdvTHHB72eh2NT:yvf22SsaNYfdPBldt6+dBcjHNzRJ6/

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.104:4782

Mutex

0b53b5f1-6e56-4e94-bd1e-c8d3128b0755

Attributes

encryption_key
06B92BA0BB279356BE72C22FE42BED732D4D3DF7
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
HD Audio Background Processor
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

resource	yara_rule
behavioral1/memory/2344-1-0x0000000000300000-0x0000000000624000-memory.dmp	family_quasar
behavioral1/files/0x0008000000015d59-6.dat	family_quasar
behavioral1/memory/796-9-0x0000000000EB0000-0x00000000011D4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
796	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
2588	schtasks.exe
2296	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2344	Client-built.exe
Token: SeDebugPrivilege	796	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
796	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2344 wrote to memory of 2588	2344	Client-built.exe	30
PID 2344 wrote to memory of 2588	2344	Client-built.exe	30
PID 2344 wrote to memory of 2588	2344	Client-built.exe	30
PID 2344 wrote to memory of 796	2344	Client-built.exe	32
PID 2344 wrote to memory of 796	2344	Client-built.exe	32
PID 2344 wrote to memory of 796	2344	Client-built.exe	32
PID 796 wrote to memory of 2296	796	Client.exe	33
PID 796 wrote to memory of 2296	796	Client.exe	33
PID 796 wrote to memory of 2296	796	Client.exe	33

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:2344
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "HD Audio Background Processor" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2588
- 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:796
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "HD Audio Background Processor" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2296

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
e34ce1e492d0a57ec3997512039793c9

SHA1
d3ec7bfd2d7f676adede7195db6c1a679d5c06a8

SHA256
e843601fcf7ac35515d0478e9ffa7e989826405389ada46b4627e26bc4d1fdfe

SHA512
00cd5d896efaaba657f3d5e917d43ff4360bb3e5d2779abf8b468b8526fed8e5ae22285f6e42c2c9f2e6155cde3049e87a855a5405be2cfaf23561acad96a7fe

Download Submit
memory/796-9-0x0000000000EB0000-0x00000000011D4000-memory.dmp

Filesize
3.1MB

Download
memory/796-11-0x000007FEF67F0000-0x000007FEF71DC000-memory.dmp

Filesize
9.9MB

Download
memory/796-10-0x000007FEF67F0000-0x000007FEF71DC000-memory.dmp

Filesize
9.9MB

Download
memory/796-12-0x000007FEF67F0000-0x000007FEF71DC000-memory.dmp

Filesize
9.9MB

Download
memory/2344-0-0x000007FEF67F3000-0x000007FEF67F4000-memory.dmp

Filesize
4KB

Download
memory/2344-1-0x0000000000300000-0x0000000000624000-memory.dmp

Filesize
3.1MB

Download
memory/2344-2-0x000007FEF67F0000-0x000007FEF71DC000-memory.dmp

Filesize
9.9MB

Download
memory/2344-8-0x000007FEF67F0000-0x000007FEF71DC000-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