quasar | 6498dbfa29de6a0caf8b1e099f7ec2676ef5b2ac0576f6bb324122e7a4162853

Analysis

max time kernel
148s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
02/01/2025, 08:24

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General

Target

c.exe
Size

3.1MB
MD5

b7626d89b385c029db4666f162c25d48
SHA1

3c0b0e61ca49c7e0d394f4936757403dc74bf3c8
SHA256

6498dbfa29de6a0caf8b1e099f7ec2676ef5b2ac0576f6bb324122e7a4162853
SHA512

9234c0895237433ec0ab0dfde4f9ec957816e453c2b0f0f106185ea40954e5a353a0762e5b88e4d603bbaf20748dab4aca60a7c2f745b33ff3b7248aab102ad2
SSDEEP

49152:Kvkt62XlaSFNWPjljiFa2RoUYIuARJ6obR3LoGdcgJTHHB72eh2NT:Kv462XlaSFNWPjljiFXRoUYIuARJ6Cj

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

38.242.241.140:4782

Mutex

4b387528-97ec-466a-915c-099747a4eb75

Attributes

encryption_key
E3FC55CEBE0920BC04F0B9E76DF59B61B3B7C9EA
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Essentials
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
behavioral2/memory/2420-1-0x00000000001E0000-0x0000000000504000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023cb1-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2144	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
4744	schtasks.exe
884	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2420	c.exe
Token: SeDebugPrivilege	2144	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2144	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2420 wrote to memory of 4744	2420	c.exe	83
PID 2420 wrote to memory of 4744	2420	c.exe	83
PID 2420 wrote to memory of 2144	2420	c.exe	85
PID 2420 wrote to memory of 2144	2420	c.exe	85
PID 2144 wrote to memory of 884	2144	Client.exe	86
PID 2144 wrote to memory of 884	2144	Client.exe	86

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\c.exe
"C:\Users\Admin\AppData\Local\Temp\c.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2420
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Essentials" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4744
- 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:2144
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Essentials" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:884

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
b7626d89b385c029db4666f162c25d48

SHA1
3c0b0e61ca49c7e0d394f4936757403dc74bf3c8

SHA256
6498dbfa29de6a0caf8b1e099f7ec2676ef5b2ac0576f6bb324122e7a4162853

SHA512
9234c0895237433ec0ab0dfde4f9ec957816e453c2b0f0f106185ea40954e5a353a0762e5b88e4d603bbaf20748dab4aca60a7c2f745b33ff3b7248aab102ad2

Download Submit
memory/2144-10-0x00007FF8470A0000-0x00007FF847B61000-memory.dmp

Filesize
10.8MB

Download
memory/2144-11-0x00007FF8470A0000-0x00007FF847B61000-memory.dmp

Filesize
10.8MB

Download
memory/2144-12-0x000000001BB00000-0x000000001BB50000-memory.dmp

Filesize
320KB

Download
memory/2144-13-0x000000001C340000-0x000000001C3F2000-memory.dmp

Filesize
712KB

Download
memory/2144-14-0x00007FF8470A0000-0x00007FF847B61000-memory.dmp

Filesize
10.8MB

Download
memory/2420-0-0x00007FF8470A3000-0x00007FF8470A5000-memory.dmp

Filesize
8KB

Download
memory/2420-1-0x00000000001E0000-0x0000000000504000-memory.dmp

Filesize
3.1MB

Download
memory/2420-2-0x00007FF8470A0000-0x00007FF847B61000-memory.dmp

Filesize
10.8MB

Download
memory/2420-9-0x00007FF8470A0000-0x00007FF847B61000-memory.dmp

Filesize
10.8MB

Download

Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads