quasar | f8e5cfd63bc1fafc14772f29cfba051516776ce36ea054dcff65f46146b2a3b1 | Triage

Analysis

max time kernel
126s
max time network
136s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
04-01-2025 09:35

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General

Target

Client-built.exe
Size

3.1MB
MD5

786abdcb703d20e3de3bf5a379d81a14
SHA1

8e14e12df03ed017e2dd98fe1b00d4869ceacac4
SHA256

f8e5cfd63bc1fafc14772f29cfba051516776ce36ea054dcff65f46146b2a3b1
SHA512

28886a95fde73cc6bbf4252374a50979f893ba12d9ac92f95a40c46d5a9ef85dde436bf89a09eb84a7380d799b8ff59e50de7fd192ff17e4d7884d973fa39fe9
SSDEEP

49152:rvht62XlaSFNWPjljiFa2RoUYIYNi3Rar7loGdAxALTHHB72eh2NT:rvL62XlaSFNWPjljiFXRoUYIL3sH

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.46:4782

Mutex

5beee952-b6db-411d-a01f-ad2f22709cbe

Attributes

encryption_key
588523317381A841ECE4E6415CCED796AA0FA544
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
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/2572-8-0x00000000011A0000-0x00000000014C4000-memory.dmp	family_quasar
behavioral1/files/0x00070000000186ee-6.dat	family_quasar
behavioral1/memory/2236-1-0x0000000000E90000-0x00000000011B4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2572	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

pid	Process
1748	schtasks.exe
1124	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2236	Client-built.exe
Token: SeDebugPrivilege	2572	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2572	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2572	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2236 wrote to memory of 1124	2236	Client-built.exe	30
PID 2236 wrote to memory of 1124	2236	Client-built.exe	30
PID 2236 wrote to memory of 1124	2236	Client-built.exe	30
PID 2236 wrote to memory of 2572	2236	Client-built.exe	32
PID 2236 wrote to memory of 2572	2236	Client-built.exe	32
PID 2236 wrote to memory of 2572	2236	Client-built.exe	32
PID 2572 wrote to memory of 1748	2572	Client.exe	33
PID 2572 wrote to memory of 1748	2572	Client.exe	33
PID 2572 wrote to memory of 1748	2572	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:2236
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1124
- 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:2572
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1748

C:\Windows\explorer.exe
"C:\Windows\explorer.exe"
1⤵
PID:2924

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Scheduled Task

Persistence

Scheduled Task/Job

Scheduled Task

Privilege Escalation

Scheduled Task/Job

Scheduled Task

Defense Evasion

Credential Access

Discovery

Query Registry

System Information Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
786abdcb703d20e3de3bf5a379d81a14

SHA1
8e14e12df03ed017e2dd98fe1b00d4869ceacac4

SHA256
f8e5cfd63bc1fafc14772f29cfba051516776ce36ea054dcff65f46146b2a3b1

SHA512
28886a95fde73cc6bbf4252374a50979f893ba12d9ac92f95a40c46d5a9ef85dde436bf89a09eb84a7380d799b8ff59e50de7fd192ff17e4d7884d973fa39fe9

Download Submit
memory/2236-7-0x000007FEF5350000-0x000007FEF5D3C000-memory.dmp

Filesize
9.9MB

Download
memory/2236-2-0x000007FEF5350000-0x000007FEF5D3C000-memory.dmp

Filesize
9.9MB

Download
memory/2236-1-0x0000000000E90000-0x00000000011B4000-memory.dmp

Filesize
3.1MB

Download
memory/2236-0-0x000007FEF5353000-0x000007FEF5354000-memory.dmp

Filesize
4KB

Download
memory/2572-10-0x000007FEF5350000-0x000007FEF5D3C000-memory.dmp

Filesize
9.9MB

Download
memory/2572-9-0x000007FEF5350000-0x000007FEF5D3C000-memory.dmp

Filesize
9.9MB

Download
memory/2572-8-0x00000000011A0000-0x00000000014C4000-memory.dmp

Filesize
3.1MB

Download
memory/2572-11-0x000007FEF5350000-0x000007FEF5D3C000-memory.dmp

Filesize
9.9MB

Download