quasar | 175ec7e1176528a017ac2709fa1132d38d13dbf1e56ccd92813f5f0de0c67cbf

Analysis

max time kernel
131s
max time network
146s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
08-02-2025 03:48

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General

Target

Client-built.exe
Size

3.1MB
MD5

cb477316add6ca54244dd574ffeb1643
SHA1

920cefdc72dcfc129b9134be11e204a1f7966f42
SHA256

175ec7e1176528a017ac2709fa1132d38d13dbf1e56ccd92813f5f0de0c67cbf
SHA512

e93edbe7055815880fa4843af709e04cb0923c73f643cfa3380704a1a75ef316b751fb7b5a36189c51a50476b39cc7a4e46ae390b717896a4175d061e779538f
SSDEEP

49152:SvyI22SsaNYfdPBldt698dBcjHcUA38arAgoGd9THHB72eh2NT:Svf22SsaNYfdPBldt6+dBcjHg3Z

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

98.218.3.74:4782

Mutex

3808ff71-c2df-4538-8d66-6459677347c3

Attributes

encryption_key
24BCF759F51AE66E5C4BF0A521BA79747D6F977F
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 3 IoCs

resource	yara_rule
behavioral1/memory/2548-1-0x0000000000810000-0x0000000000B34000-memory.dmp	family_quasar
behavioral1/files/0x00280000000186b7-6.dat	family_quasar
behavioral1/memory/2928-8-0x00000000010C0000-0x00000000013E4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2928	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
2396	schtasks.exe
568	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2548	Client-built.exe
Token: SeDebugPrivilege	2928	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2928	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2548 wrote to memory of 2396	2548	Client-built.exe	30
PID 2548 wrote to memory of 2396	2548	Client-built.exe	30
PID 2548 wrote to memory of 2396	2548	Client-built.exe	30
PID 2548 wrote to memory of 2928	2548	Client-built.exe	32
PID 2548 wrote to memory of 2928	2548	Client-built.exe	32
PID 2548 wrote to memory of 2928	2548	Client-built.exe	32
PID 2928 wrote to memory of 568	2928	Client.exe	33
PID 2928 wrote to memory of 568	2928	Client.exe	33
PID 2928 wrote to memory of 568	2928	Client.exe	33

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:2548
- 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:2396
- 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:2928
- - 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:568

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
cb477316add6ca54244dd574ffeb1643

SHA1
920cefdc72dcfc129b9134be11e204a1f7966f42

SHA256
175ec7e1176528a017ac2709fa1132d38d13dbf1e56ccd92813f5f0de0c67cbf

SHA512
e93edbe7055815880fa4843af709e04cb0923c73f643cfa3380704a1a75ef316b751fb7b5a36189c51a50476b39cc7a4e46ae390b717896a4175d061e779538f

Download Submit
memory/2548-0-0x000007FEF6133000-0x000007FEF6134000-memory.dmp

Filesize
4KB

Download
memory/2548-1-0x0000000000810000-0x0000000000B34000-memory.dmp

Filesize
3.1MB

Download
memory/2548-2-0x000007FEF6130000-0x000007FEF6B1C000-memory.dmp

Filesize
9.9MB

Download
memory/2548-10-0x000007FEF6130000-0x000007FEF6B1C000-memory.dmp

Filesize
9.9MB

Download
memory/2928-9-0x000007FEF6130000-0x000007FEF6B1C000-memory.dmp

Filesize
9.9MB

Download
memory/2928-8-0x00000000010C0000-0x00000000013E4000-memory.dmp

Filesize
3.1MB

Download
memory/2928-11-0x000007FEF6130000-0x000007FEF6B1C000-memory.dmp

Filesize
9.9MB

Download
memory/2928-12-0x000007FEF6130000-0x000007FEF6B1C000-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