quasar | a94e45818c0b816f85d0c2608c0a1b03e75090b2c5930f20a42c7d127579e5e9

Analysis

max time kernel
739s
max time network
749s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
27/03/2025, 16:23

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General

Target

Client-built.exe
Size

3.1MB
MD5

d99d7d556d5021fbd6926bc2dbf937cb
SHA1

a84dba6c50fb7a9fb96a88034a0b0beca902d816
SHA256

a94e45818c0b816f85d0c2608c0a1b03e75090b2c5930f20a42c7d127579e5e9
SHA512

41b1f8b7887d6288bdc868ce941c2368e576503c272e0a48f9c662e67ee253ea62c5cef3a34a25d15515e37175465c281f8219450542c18db7d5326423cae8c9
SSDEEP

49152:Wvkt62XlaSFNWPjljiFa2RoUYI59RJ6ubR3LoGdroTHHB72eh2NT:Wv462XlaSFNWPjljiFXRoUYI59RJ6ob

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.20:4782

Mutex

09fd8aa4-f8ef-40d0-96f7-029c82b74a3a

Attributes

encryption_key
5FA4C5B780FA0149296752FBE0A794A5BF0E5B11
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
dont mind this
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/2880-1-0x0000000000B90000-0x0000000000EB4000-memory.dmp	family_quasar
behavioral1/files/0x0008000000016dd0-6.dat	family_quasar
behavioral1/memory/2836-10-0x0000000000920000-0x0000000000C44000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2836	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
320	schtasks.exe
2740	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2880	Client-built.exe
Token: SeDebugPrivilege	2836	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2836	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2880 wrote to memory of 320	2880	Client-built.exe	31
PID 2880 wrote to memory of 320	2880	Client-built.exe	31
PID 2880 wrote to memory of 320	2880	Client-built.exe	31
PID 2880 wrote to memory of 2836	2880	Client-built.exe	33
PID 2880 wrote to memory of 2836	2880	Client-built.exe	33
PID 2880 wrote to memory of 2836	2880	Client-built.exe	33
PID 2836 wrote to memory of 2740	2836	Client.exe	34
PID 2836 wrote to memory of 2740	2836	Client.exe	34
PID 2836 wrote to memory of 2740	2836	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:2880
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "dont mind this " /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:320
- 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:2836
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "dont mind this " /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2740

C:\Windows\explorer.exe
"C:\Windows\explorer.exe"
1⤵
PID:2664

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
d99d7d556d5021fbd6926bc2dbf937cb

SHA1
a84dba6c50fb7a9fb96a88034a0b0beca902d816

SHA256
a94e45818c0b816f85d0c2608c0a1b03e75090b2c5930f20a42c7d127579e5e9

SHA512
41b1f8b7887d6288bdc868ce941c2368e576503c272e0a48f9c662e67ee253ea62c5cef3a34a25d15515e37175465c281f8219450542c18db7d5326423cae8c9

Download Submit
memory/2836-9-0x000007FEF5870000-0x000007FEF625C000-memory.dmp

Filesize
9.9MB

Download
memory/2836-10-0x0000000000920000-0x0000000000C44000-memory.dmp

Filesize
3.1MB

Download
memory/2836-11-0x000007FEF5870000-0x000007FEF625C000-memory.dmp

Filesize
9.9MB

Download
memory/2836-12-0x000007FEF5870000-0x000007FEF625C000-memory.dmp

Filesize
9.9MB

Download
memory/2836-13-0x000007FEF5870000-0x000007FEF625C000-memory.dmp

Filesize
9.9MB

Download
memory/2880-0-0x000007FEF5873000-0x000007FEF5874000-memory.dmp

Filesize
4KB

Download
memory/2880-1-0x0000000000B90000-0x0000000000EB4000-memory.dmp

Filesize
3.1MB

Download
memory/2880-2-0x000007FEF5870000-0x000007FEF625C000-memory.dmp

Filesize
9.9MB

Download
memory/2880-8-0x000007FEF5870000-0x000007FEF625C000-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