quasar | 319f3d6b92ec7d20d9920d1e9f2cc67a2ce689335a748746fe38f37a16868e4e

Analysis

max time kernel
126s
max time network
139s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
20/12/2024, 23:31

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General

Target

Client-built.exe
Size

3.1MB
MD5

40fa1552520311d0c0770ba34d964602
SHA1

02223b59b2a18f2c55fd94a2f4c2ed9a596790e0
SHA256

6c6c7f83572cc8b39070e23ff5d8b25da332e51e989d7b65d32f52bd7d86c2f9
SHA512

e1ed2fab4a401783dd942a1af20f682244a387fd898078f19eacbb1fea151e9b6667b8a447a7ef835352ff14b5ca27433c7bf2dd40c129c448a38b295c8b9677
SSDEEP

49152:uvyI22SsaNYfdPBldt698dBcjHgaZwGs6loGdtYCTHHB72eh2NT:uvf22SsaNYfdPBldt6+dBcjHgUwGsuu

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.14:4782

Mutex

0c87075a-1709-4bbf-b370-fda5b6d1d98e

Attributes

encryption_key
8964B598D8DCA54C855C6A0315930A7B1DEA3A38
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/2420-1-0x0000000000170000-0x0000000000494000-memory.dmp	family_quasar
behavioral1/files/0x0008000000016ca5-6.dat	family_quasar
behavioral1/memory/2384-9-0x0000000000C50000-0x0000000000F74000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2384	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
2424	schtasks.exe
2784	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2420	Client-built.exe
Token: SeDebugPrivilege	2384	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2384	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2420 wrote to memory of 2424	2420	Client-built.exe	30
PID 2420 wrote to memory of 2424	2420	Client-built.exe	30
PID 2420 wrote to memory of 2424	2420	Client-built.exe	30
PID 2420 wrote to memory of 2384	2420	Client-built.exe	32
PID 2420 wrote to memory of 2384	2420	Client-built.exe	32
PID 2420 wrote to memory of 2384	2420	Client-built.exe	32
PID 2384 wrote to memory of 2784	2384	Client.exe	33
PID 2384 wrote to memory of 2784	2384	Client.exe	33
PID 2384 wrote to memory of 2784	2384	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:2420
- 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:2424
- 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:2384
- - 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:2784

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
40fa1552520311d0c0770ba34d964602

SHA1
02223b59b2a18f2c55fd94a2f4c2ed9a596790e0

SHA256
6c6c7f83572cc8b39070e23ff5d8b25da332e51e989d7b65d32f52bd7d86c2f9

SHA512
e1ed2fab4a401783dd942a1af20f682244a387fd898078f19eacbb1fea151e9b6667b8a447a7ef835352ff14b5ca27433c7bf2dd40c129c448a38b295c8b9677

Download Submit
memory/2384-11-0x000007FEF5710000-0x000007FEF60FC000-memory.dmp

Filesize
9.9MB

Download
memory/2384-10-0x000007FEF5710000-0x000007FEF60FC000-memory.dmp

Filesize
9.9MB

Download
memory/2384-9-0x0000000000C50000-0x0000000000F74000-memory.dmp

Filesize
3.1MB

Download
memory/2384-12-0x000007FEF5710000-0x000007FEF60FC000-memory.dmp

Filesize
9.9MB

Download
memory/2420-0-0x000007FEF5713000-0x000007FEF5714000-memory.dmp

Filesize
4KB

Download
memory/2420-1-0x0000000000170000-0x0000000000494000-memory.dmp

Filesize
3.1MB

Download
memory/2420-2-0x000007FEF5710000-0x000007FEF60FC000-memory.dmp

Filesize
9.9MB

Download
memory/2420-8-0x000007FEF5710000-0x000007FEF60FC000-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