quasar | b740db98e8a70452843496f386054924c1979183d6fc571d04eb92cb7f29b73a

Analysis

max time kernel
33s
max time network
48s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
16-01-2025 22:06

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General

Target

Client-built.exe
Size

3.1MB
MD5

18ba5722df304f946d06dd51f1eb6e5b
SHA1

4b4ba8df00857906b91efae60360499b93a365fd
SHA256

b740db98e8a70452843496f386054924c1979183d6fc571d04eb92cb7f29b73a
SHA512

5f07ce682a191572f73910df17f1082b5ba9298a9a893e638fc2c07018310f0199d687dae47aeb5d150f5e0299e4ec1aa0884ee5de3abe4aaabda951b34bca21
SSDEEP

49152:uvyI22SsaNYfdPBldt698dBcjHMERJ6JbR3LoGdiCTHHB72eh2NT:uvf22SsaNYfdPBldt6+dBcjHMERJ6Ly

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.40.122:4782

Mutex

942ee276-fcd1-44b1-aa7e-cbce8dcf101a

Attributes

encryption_key
F38746D956F52C2D74C5EA46908D0B22D4BB8A0C
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 3 IoCs

resource	yara_rule
behavioral1/memory/2596-1-0x0000000000F50000-0x0000000001274000-memory.dmp	family_quasar
behavioral1/files/0x0031000000018bbf-6.dat	family_quasar
behavioral1/memory/640-9-0x0000000000FE0000-0x0000000001304000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
640	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
2876	schtasks.exe
2908	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2596	Client-built.exe
Token: SeDebugPrivilege	640	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
640	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2596 wrote to memory of 2876	2596	Client-built.exe	29
PID 2596 wrote to memory of 2876	2596	Client-built.exe	29
PID 2596 wrote to memory of 2876	2596	Client-built.exe	29
PID 2596 wrote to memory of 640	2596	Client-built.exe	31
PID 2596 wrote to memory of 640	2596	Client-built.exe	31
PID 2596 wrote to memory of 640	2596	Client-built.exe	31
PID 640 wrote to memory of 2908	640	Client.exe	32
PID 640 wrote to memory of 2908	640	Client.exe	32
PID 640 wrote to memory of 2908	640	Client.exe	32

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:2596
- 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
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2876
- 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:640
- - 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:2908

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
18ba5722df304f946d06dd51f1eb6e5b

SHA1
4b4ba8df00857906b91efae60360499b93a365fd

SHA256
b740db98e8a70452843496f386054924c1979183d6fc571d04eb92cb7f29b73a

SHA512
5f07ce682a191572f73910df17f1082b5ba9298a9a893e638fc2c07018310f0199d687dae47aeb5d150f5e0299e4ec1aa0884ee5de3abe4aaabda951b34bca21

Download Submit
memory/640-9-0x0000000000FE0000-0x0000000001304000-memory.dmp

Filesize
3.1MB

Download
memory/640-10-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

Filesize
9.9MB

Download
memory/640-11-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

Filesize
9.9MB

Download
memory/640-12-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

Filesize
9.9MB

Download
memory/2596-0-0x000007FEF5B13000-0x000007FEF5B14000-memory.dmp

Filesize
4KB

Download
memory/2596-1-0x0000000000F50000-0x0000000001274000-memory.dmp

Filesize
3.1MB

Download
memory/2596-2-0x000007FEF5B10000-0x000007FEF64FC000-memory.dmp

Filesize
9.9MB

Download
memory/2596-8-0x000007FEF5B10000-0x000007FEF64FC000-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