quasar | de5fdd1c4eab3b2ac4281b03fc7a1b24bd815f6b12bce909755fe2738ab94c44

Analysis

max time kernel
126s
max time network
136s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
24/03/2025, 11:57

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General

Target

Client-built.exe
Size

3.1MB
MD5

621755714a193b4d557c2477c185a080
SHA1

0fa113b4ee92a92274d85ef8b5bccced70f96b74
SHA256

de5fdd1c4eab3b2ac4281b03fc7a1b24bd815f6b12bce909755fe2738ab94c44
SHA512

b53972b855f6249ce277cd212933a9bb2f795c1e2e263fec62a6a7068ab9b4541ea99a82b5c3443c3a29486f4f6615f03b7721b7747a46b503a75e342b155ce6
SSDEEP

98304:6vI62XlaSFNWPjljiFXRoUYID9RJ61Zf:MAZYcY

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

10.0.2.15:4782

Mutex

e5b62a3f-1d76-4ce3-b145-c4738e342ae6

Attributes

encryption_key
5A573CB681082703764120F09BB1C9929732AAD8
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/3068-1-0x0000000000E30000-0x0000000001154000-memory.dmp	family_quasar
behavioral1/files/0x0008000000019429-6.dat	family_quasar
behavioral1/memory/2020-10-0x0000000000C60000-0x0000000000F84000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2020	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
2080	schtasks.exe
2516	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3068	Client-built.exe
Token: SeDebugPrivilege	2020	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2020	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3068 wrote to memory of 2080	3068	Client-built.exe	31
PID 3068 wrote to memory of 2080	3068	Client-built.exe	31
PID 3068 wrote to memory of 2080	3068	Client-built.exe	31
PID 3068 wrote to memory of 2020	3068	Client-built.exe	33
PID 3068 wrote to memory of 2020	3068	Client-built.exe	33
PID 3068 wrote to memory of 2020	3068	Client-built.exe	33
PID 2020 wrote to memory of 2516	2020	Client.exe	34
PID 2020 wrote to memory of 2516	2020	Client.exe	34
PID 2020 wrote to memory of 2516	2020	Client.exe	34

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:3068
- 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:2080
- 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:2020
- - 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:2516

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
621755714a193b4d557c2477c185a080

SHA1
0fa113b4ee92a92274d85ef8b5bccced70f96b74

SHA256
de5fdd1c4eab3b2ac4281b03fc7a1b24bd815f6b12bce909755fe2738ab94c44

SHA512
b53972b855f6249ce277cd212933a9bb2f795c1e2e263fec62a6a7068ab9b4541ea99a82b5c3443c3a29486f4f6615f03b7721b7747a46b503a75e342b155ce6

Download Submit
memory/2020-8-0x000007FEF5AB0000-0x000007FEF649C000-memory.dmp

Filesize
9.9MB

Download
memory/2020-11-0x000007FEF5AB0000-0x000007FEF649C000-memory.dmp

Filesize
9.9MB

Download
memory/2020-10-0x0000000000C60000-0x0000000000F84000-memory.dmp

Filesize
3.1MB

Download
memory/2020-12-0x000007FEF5AB0000-0x000007FEF649C000-memory.dmp

Filesize
9.9MB

Download
memory/3068-0-0x000007FEF5AB3000-0x000007FEF5AB4000-memory.dmp

Filesize
4KB

Download
memory/3068-1-0x0000000000E30000-0x0000000001154000-memory.dmp

Filesize
3.1MB

Download
memory/3068-2-0x000007FEF5AB0000-0x000007FEF649C000-memory.dmp

Filesize
9.9MB

Download
memory/3068-9-0x000007FEF5AB0000-0x000007FEF649C000-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