quasar | 3a3fd0e996477049a63b779dda5d31c20ebbae2b8733f3224ee7a2a88350175f

Analysis

max time kernel
101s
max time network
105s
platform
windows11-21h2_x64
resource
win11-20250410-en
resource tags

arch:x64arch:x86image:win11-20250410-enlocale:en-usos:windows11-21h2-x64system
submitted
20/04/2025, 13:03

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General

Target

Client-built.exe
Size

3.1MB
MD5

20e2ad97770afcb29a641ada5db33fe3
SHA1

96931794912869c9f83e5e9a091bd290257f5b8b
SHA256

3a3fd0e996477049a63b779dda5d31c20ebbae2b8733f3224ee7a2a88350175f
SHA512

fc386626fef804a2aa221ebb3f420b7b5c2e63c359b5bdc915d9bc9ad72f8daea025329afd5e381f253635fdda681099a79f72283dbd6d22bfdde6bb519d6ac7
SSDEEP

49152:+vht62XlaSFNWPjljiFa2RoUYIYFRJ6bbR3LoGdOcTHHB72eh2NT:+vL62XlaSFNWPjljiFXRoUYIYFRJ6te

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.117:4782

Mutex

a7074e5e-ed13-4240-b2bd-3139cf111cf4

Attributes

encryption_key
B1A93851F2B7AB11E1C412D6A94DD30CC9FC53BD
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
java update
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
behavioral1/memory/4404-1-0x0000000000920000-0x0000000000C44000-memory.dmp	family_quasar
behavioral1/files/0x001900000002b155-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
884	Client.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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
4480	schtasks.exe
3476	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4404	Client-built.exe
Token: SeDebugPrivilege	884	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
884	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
884	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4404 wrote to memory of 4480	4404	Client-built.exe	84
PID 4404 wrote to memory of 4480	4404	Client-built.exe	84
PID 4404 wrote to memory of 884	4404	Client-built.exe	86
PID 4404 wrote to memory of 884	4404	Client-built.exe	86
PID 884 wrote to memory of 3476	884	Client.exe	88
PID 884 wrote to memory of 3476	884	Client.exe	88

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:4404
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "java update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4480
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of WriteProcessMemory
  PID:884
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "java update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3476

Network

MITRE ATT&CK Enterprise v16

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

System Information Discovery

T1082

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
20e2ad97770afcb29a641ada5db33fe3

SHA1
96931794912869c9f83e5e9a091bd290257f5b8b

SHA256
3a3fd0e996477049a63b779dda5d31c20ebbae2b8733f3224ee7a2a88350175f

SHA512
fc386626fef804a2aa221ebb3f420b7b5c2e63c359b5bdc915d9bc9ad72f8daea025329afd5e381f253635fdda681099a79f72283dbd6d22bfdde6bb519d6ac7

Download Submit
memory/884-9-0x00007FFF6F8F0000-0x00007FFF703B2000-memory.dmp

Filesize
10.8MB

Download
memory/884-10-0x00007FFF6F8F0000-0x00007FFF703B2000-memory.dmp

Filesize
10.8MB

Download
memory/884-11-0x000000001CC30000-0x000000001CC80000-memory.dmp

Filesize
320KB

Download
memory/884-12-0x000000001CD40000-0x000000001CDF2000-memory.dmp

Filesize
712KB

Download
memory/884-13-0x00007FFF6F8F0000-0x00007FFF703B2000-memory.dmp

Filesize
10.8MB

Download
memory/4404-0-0x00007FFF6F8F3000-0x00007FFF6F8F5000-memory.dmp

Filesize
8KB

Download
memory/4404-1-0x0000000000920000-0x0000000000C44000-memory.dmp

Filesize
3.1MB

Download
memory/4404-2-0x00007FFF6F8F0000-0x00007FFF703B2000-memory.dmp

Filesize
10.8MB

Download
memory/4404-8-0x00007FFF6F8F0000-0x00007FFF703B2000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads