quasar | 781d04dfdbfc7d4ac681f23fc8501b29390c42874e59a647273790e3cc073ce0

Analysis

max time kernel
130s
max time network
145s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
07-02-2025 22:02

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General

Target

Client-built.exe
Size

3.1MB
MD5

bb1c4dce21f5c456bd7a5e9fd4d97588
SHA1

591fae4f6bdebcaf83ccc1bea37113956b373ad1
SHA256

781d04dfdbfc7d4ac681f23fc8501b29390c42874e59a647273790e3cc073ce0
SHA512

a01d016fb7afdae41787ff8d8d5de355f040fbbd6789ad845d089116c6e0092aeab95cf91ee7e4dbda4dada1c082e9003d61acbfafe4dfa203fa5b999d161b6c
SSDEEP

49152:ivkt62XlaSFNWPjljiFa2RoUYI5FRJ69bR3LoGdKbTHHB72eh2NT:iv462XlaSFNWPjljiFXRoUYI5FRJ6Pa

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

98.218.3.74:4782

Mutex

50e9068f-e8d9-4363-bf89-859954325430

Attributes

encryption_key
3F9AC61EC3C7AFC94074BECB23299DD92BEDC742
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Bob
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/2356-1-0x0000000000890000-0x0000000000BB4000-memory.dmp	family_quasar
behavioral1/files/0x00090000000167e3-6.dat	family_quasar
behavioral1/memory/524-9-0x0000000001020000-0x0000000001344000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
524	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
1976	schtasks.exe
2860	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2356	Client-built.exe
Token: SeDebugPrivilege	524	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
524	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2356 wrote to memory of 1976	2356	Client-built.exe	31
PID 2356 wrote to memory of 1976	2356	Client-built.exe	31
PID 2356 wrote to memory of 1976	2356	Client-built.exe	31
PID 2356 wrote to memory of 524	2356	Client-built.exe	33
PID 2356 wrote to memory of 524	2356	Client-built.exe	33
PID 2356 wrote to memory of 524	2356	Client-built.exe	33
PID 524 wrote to memory of 2860	524	Client.exe	34
PID 524 wrote to memory of 2860	524	Client.exe	34
PID 524 wrote to memory of 2860	524	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:2356
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Bob" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1976
- 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:524
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Bob" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2860

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
bb1c4dce21f5c456bd7a5e9fd4d97588

SHA1
591fae4f6bdebcaf83ccc1bea37113956b373ad1

SHA256
781d04dfdbfc7d4ac681f23fc8501b29390c42874e59a647273790e3cc073ce0

SHA512
a01d016fb7afdae41787ff8d8d5de355f040fbbd6789ad845d089116c6e0092aeab95cf91ee7e4dbda4dada1c082e9003d61acbfafe4dfa203fa5b999d161b6c

Download Submit
memory/524-9-0x0000000001020000-0x0000000001344000-memory.dmp

Filesize
3.1MB

Download
memory/524-10-0x000007FEF60D0000-0x000007FEF6ABC000-memory.dmp

Filesize
9.9MB

Download
memory/524-11-0x000007FEF60D0000-0x000007FEF6ABC000-memory.dmp

Filesize
9.9MB

Download
memory/524-12-0x000007FEF60D0000-0x000007FEF6ABC000-memory.dmp

Filesize
9.9MB

Download
memory/2356-0-0x000007FEF60D3000-0x000007FEF60D4000-memory.dmp

Filesize
4KB

Download
memory/2356-1-0x0000000000890000-0x0000000000BB4000-memory.dmp

Filesize
3.1MB

Download
memory/2356-2-0x000007FEF60D0000-0x000007FEF6ABC000-memory.dmp

Filesize
9.9MB

Download
memory/2356-8-0x000007FEF60D0000-0x000007FEF6ABC000-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