quasar | de5fdd1c4eab3b2ac4281b03fc7a1b24bd815f6b12bce909755fe2738ab94c44

Analysis

max time kernel
126s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-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 2 IoCs

resource	yara_rule
behavioral2/memory/468-1-0x0000000000DF0000-0x0000000001114000-memory.dmp	family_quasar
behavioral2/files/0x000800000002430d-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2380	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
4448	schtasks.exe
4492	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	468	Client-built.exe
Token: SeDebugPrivilege	2380	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2380	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 468 wrote to memory of 4448	468	Client-built.exe	90
PID 468 wrote to memory of 4448	468	Client-built.exe	90
PID 468 wrote to memory of 2380	468	Client-built.exe	92
PID 468 wrote to memory of 2380	468	Client-built.exe	92
PID 2380 wrote to memory of 4492	2380	Client.exe	93
PID 2380 wrote to memory of 4492	2380	Client.exe	93

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:468
- 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:4448
- 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:2380
- - 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:4492

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/468-0-0x00007FF8D7673000-0x00007FF8D7675000-memory.dmp

Filesize
8KB

Download
memory/468-1-0x0000000000DF0000-0x0000000001114000-memory.dmp

Filesize
3.1MB

Download
memory/468-2-0x00007FF8D7670000-0x00007FF8D8131000-memory.dmp

Filesize
10.8MB

Download
memory/468-9-0x00007FF8D7670000-0x00007FF8D8131000-memory.dmp

Filesize
10.8MB

Download
memory/2380-10-0x00007FF8D7670000-0x00007FF8D8131000-memory.dmp

Filesize
10.8MB

Download
memory/2380-11-0x00007FF8D7670000-0x00007FF8D8131000-memory.dmp

Filesize
10.8MB

Download
memory/2380-12-0x0000000000F70000-0x0000000000FC0000-memory.dmp

Filesize
320KB

Download
memory/2380-13-0x000000001BC70000-0x000000001BD22000-memory.dmp

Filesize
712KB

Download
memory/2380-14-0x00007FF8D7670000-0x00007FF8D8131000-memory.dmp

Filesize
10.8MB

Download

Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads