quasar | e4a58b3417357ded9fd07dc89a753c98ff7faacd65c9a03c8cf39f344bc7264c

Analysis

max time kernel
141s
max time network
148s
platform
windows10-ltsc_2021_x64
resource
win10ltsc2021-20250314-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20250314-enlocale:en-usos:windows10-ltsc_2021-x64system
submitted
27/03/2025, 14:51

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General

Target

Menu-Ch3at.exe
Size

3.1MB
MD5

0ae07968685856f0f7eb7c4bd3177913
SHA1

15d96644104b591a452f9f1dc518e7c52080699e
SHA256

e4a58b3417357ded9fd07dc89a753c98ff7faacd65c9a03c8cf39f344bc7264c
SHA512

e23abfb6a4e5c7a883d6b0bfb5a89f9276144b238cdb0c7b06fa83be2988b5526d368131ee574010e60623d824c0d30cf3993df4b8ffc4b47338ff44fd294add
SSDEEP

49152:HvqlL26AaNeWgPhlmVqvMQ7XSKeKRJ6KbR3LoGd5KTHHB72eh2NT:HvSL26AaNeWgPhlmVqkQ7XSKeKRJ6k

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.56.1:4782

Mutex

04eb6d6e-a38b-44ff-a58f-04dac1ca2ccb

Attributes

encryption_key
16FBBE4105204BB961848BADEA8A7056CC506D3C
install_name
RtkAudUService64.exe
log_directory
Logs
reconnect_delay
3000
startup_key
RtkAudUService64.exe
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/2964-1-0x0000000000250000-0x0000000000574000-memory.dmp	family_quasar
behavioral2/files/0x0008000000028121-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
5828	RtkAudUService64.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\RtkAudUService64.exe	Menu-Ch3at.exe
File opened for modification	C:\Windows\system32\SubDir\RtkAudUService64.exe	Menu-Ch3at.exe
File opened for modification	C:\Windows\system32\SubDir	Menu-Ch3at.exe
File opened for modification	C:\Windows\system32\SubDir\RtkAudUService64.exe	RtkAudUService64.exe
File opened for modification	C:\Windows\system32\SubDir	RtkAudUService64.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
4152	schtasks.exe
5564	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2964	Menu-Ch3at.exe
Token: SeDebugPrivilege	5828	RtkAudUService64.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5828	RtkAudUService64.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2964 wrote to memory of 4152	2964	Menu-Ch3at.exe	82
PID 2964 wrote to memory of 4152	2964	Menu-Ch3at.exe	82
PID 2964 wrote to memory of 5828	2964	Menu-Ch3at.exe	84
PID 2964 wrote to memory of 5828	2964	Menu-Ch3at.exe	84
PID 5828 wrote to memory of 5564	5828	RtkAudUService64.exe	85
PID 5828 wrote to memory of 5564	5828	RtkAudUService64.exe	85

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\Menu-Ch3at.exe
"C:\Users\Admin\AppData\Local\Temp\Menu-Ch3at.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2964
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "RtkAudUService64.exe" /sc ONLOGON /tr "C:\Windows\system32\SubDir\RtkAudUService64.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4152
- C:\Windows\system32\SubDir\RtkAudUService64.exe
  "C:\Windows\system32\SubDir\RtkAudUService64.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5828
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "RtkAudUService64.exe" /sc ONLOGON /tr "C:\Windows\system32\SubDir\RtkAudUService64.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:5564

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:\Windows\System32\SubDir\RtkAudUService64.exe

Filesize
3.1MB

MD5
0ae07968685856f0f7eb7c4bd3177913

SHA1
15d96644104b591a452f9f1dc518e7c52080699e

SHA256
e4a58b3417357ded9fd07dc89a753c98ff7faacd65c9a03c8cf39f344bc7264c

SHA512
e23abfb6a4e5c7a883d6b0bfb5a89f9276144b238cdb0c7b06fa83be2988b5526d368131ee574010e60623d824c0d30cf3993df4b8ffc4b47338ff44fd294add

Download Submit
memory/2964-0-0x00007FFF4D963000-0x00007FFF4D965000-memory.dmp

Filesize
8KB

Download
memory/2964-1-0x0000000000250000-0x0000000000574000-memory.dmp

Filesize
3.1MB

Download
memory/2964-2-0x00007FFF4D960000-0x00007FFF4E422000-memory.dmp

Filesize
10.8MB

Download
memory/2964-5-0x00007FFF4D960000-0x00007FFF4E422000-memory.dmp

Filesize
10.8MB

Download
memory/5828-6-0x00007FFF4D960000-0x00007FFF4E422000-memory.dmp

Filesize
10.8MB

Download
memory/5828-7-0x00007FFF4D960000-0x00007FFF4E422000-memory.dmp

Filesize
10.8MB

Download
memory/5828-8-0x000000001B610000-0x000000001B660000-memory.dmp

Filesize
320KB

Download
memory/5828-9-0x000000001E0F0000-0x000000001E1A2000-memory.dmp

Filesize
712KB

Download
memory/5828-10-0x00007FFF4D960000-0x00007FFF4E422000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads