quasar | 101e3d6e8d2128e72df1070b04033c2ffed72f0464dd3f6e7575f7ad966e0aa6

Analysis

max time kernel
26s
max time network
35s
platform
windows11-21h2_x64
resource
win11-20250410-en
resource tags

arch:x64arch:x86image:win11-20250410-enlocale:en-usos:windows11-21h2-x64system
submitted
20/04/2025, 12:47

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General

Target

TPM tools.exe
Size

3.1MB
MD5

96b2bd92ca8b0905d6808651598b9ba2
SHA1

6829193429761255b2c56b25b0a25dc641310b11
SHA256

101e3d6e8d2128e72df1070b04033c2ffed72f0464dd3f6e7575f7ad966e0aa6
SHA512

7fdc86267110bab8ff592b48735cc7452266fa9b9fcc380e0993c34f8435b03773cd7ee548a7d4461770691bd5135d6713a60bb2278c4c55ec085718d7b7a291
SSDEEP

49152:Kvht62XlaSFNWPjljiFa2RoUYI7CU1JkLoGdUTHHB72eh2NT:KvL62XlaSFNWPjljiFXRoUYI7CF

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.117:4782

Mutex

a7074e5e-ed13-4240-b2bd-3139cf111cf4

Attributes

encryption_key
B1A93851F2B7AB11E1C412D6A94DD30CC9FC53BD
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
java update
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
behavioral1/memory/5944-1-0x00000000002A0000-0x00000000005C4000-memory.dmp	family_quasar
behavioral1/files/0x001a00000002b2f9-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
5964	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

T1053.005

pid	Process
2664	schtasks.exe
3764	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5944	TPM tools.exe
Token: SeDebugPrivilege	5964	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
5964	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
5964	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5944 wrote to memory of 2664	5944	TPM tools.exe	80
PID 5944 wrote to memory of 2664	5944	TPM tools.exe	80
PID 5944 wrote to memory of 5964	5944	TPM tools.exe	82
PID 5944 wrote to memory of 5964	5944	TPM tools.exe	82
PID 5964 wrote to memory of 3764	5964	Client.exe	83
PID 5964 wrote to memory of 3764	5964	Client.exe	83

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\TPM tools.exe
"C:\Users\Admin\AppData\Local\Temp\TPM tools.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5944
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "java update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2664
- 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:5964
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "java update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3764

Network

MITRE ATT&CK Enterprise v16

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

System Information Discovery

T1082

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
96b2bd92ca8b0905d6808651598b9ba2

SHA1
6829193429761255b2c56b25b0a25dc641310b11

SHA256
101e3d6e8d2128e72df1070b04033c2ffed72f0464dd3f6e7575f7ad966e0aa6

SHA512
7fdc86267110bab8ff592b48735cc7452266fa9b9fcc380e0993c34f8435b03773cd7ee548a7d4461770691bd5135d6713a60bb2278c4c55ec085718d7b7a291

Download Submit
memory/5944-0-0x00007FFD72233000-0x00007FFD72235000-memory.dmp

Filesize
8KB

Download
memory/5944-1-0x00000000002A0000-0x00000000005C4000-memory.dmp

Filesize
3.1MB

Download
memory/5944-2-0x00007FFD72230000-0x00007FFD72CF2000-memory.dmp

Filesize
10.8MB

Download
memory/5944-8-0x00007FFD72230000-0x00007FFD72CF2000-memory.dmp

Filesize
10.8MB

Download
memory/5964-9-0x00007FFD72230000-0x00007FFD72CF2000-memory.dmp

Filesize
10.8MB

Download
memory/5964-10-0x00007FFD72230000-0x00007FFD72CF2000-memory.dmp

Filesize
10.8MB

Download
memory/5964-12-0x000000001CF50000-0x000000001D002000-memory.dmp

Filesize
712KB

Download
memory/5964-11-0x000000001CE40000-0x000000001CE90000-memory.dmp

Filesize
320KB

Download
memory/5964-13-0x00007FFD72230000-0x00007FFD72CF2000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads