quasar | ef38bf040afa8ce0bcde1328774e964bc19ef972c56d35b914be2c4c3aa3c080

Analysis

max time kernel
149s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
06-11-2024 22:57

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General

Target

fnuconaa.exe
Size

3.1MB
MD5

df870576d96d366dd1c0ff83d1e80a52
SHA1

1f9a74fbda09b50c4bd1990d75b7d228845eb4c5
SHA256

ef38bf040afa8ce0bcde1328774e964bc19ef972c56d35b914be2c4c3aa3c080
SHA512

24c5c8abc18bead7172ade2e64a4bda9f89c89a8d8fdf58a89a017a9833a4d13597b38af2b946cfdcffcc9b57ec1d58ab2a722d20ec3f47fc23f4a9b65b02848
SSDEEP

49152:HvyI22SsaNYfdPBldt698dBcjHopRJ6FbR3LoGdLgqTHHB72eh2NT:Hvf22SsaNYfdPBldt6+dBcjHopRJ6X7

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.9:57013

Mutex

e51e2b65-e963-4051-9736-67d57ed46798

Attributes

encryption_key
AEA258EF65BF1786F0F767C0BE2497ECC304C46F
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 2 IoCs

resource	yara_rule
behavioral2/memory/4752-1-0x0000000000EB0000-0x00000000011D4000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c96-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2636	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
5080	schtasks.exe
2372	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4752	fnuconaa.exe
Token: SeDebugPrivilege	2636	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2636	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4752 wrote to memory of 5080	4752	fnuconaa.exe	84
PID 4752 wrote to memory of 5080	4752	fnuconaa.exe	84
PID 4752 wrote to memory of 2636	4752	fnuconaa.exe	87
PID 4752 wrote to memory of 2636	4752	fnuconaa.exe	87
PID 2636 wrote to memory of 2372	2636	Client.exe	89
PID 2636 wrote to memory of 2372	2636	Client.exe	89

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\fnuconaa.exe
"C:\Users\Admin\AppData\Local\Temp\fnuconaa.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4752
- 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:5080
- 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:2636
- - 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:2372

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
df870576d96d366dd1c0ff83d1e80a52

SHA1
1f9a74fbda09b50c4bd1990d75b7d228845eb4c5

SHA256
ef38bf040afa8ce0bcde1328774e964bc19ef972c56d35b914be2c4c3aa3c080

SHA512
24c5c8abc18bead7172ade2e64a4bda9f89c89a8d8fdf58a89a017a9833a4d13597b38af2b946cfdcffcc9b57ec1d58ab2a722d20ec3f47fc23f4a9b65b02848

Download Submit
memory/2636-10-0x00007FFAE2C40000-0x00007FFAE3701000-memory.dmp

Filesize
10.8MB

Download
memory/2636-11-0x00007FFAE2C40000-0x00007FFAE3701000-memory.dmp

Filesize
10.8MB

Download
memory/2636-12-0x000000001B820000-0x000000001B870000-memory.dmp

Filesize
320KB

Download
memory/2636-13-0x000000001B930000-0x000000001B9E2000-memory.dmp

Filesize
712KB

Download
memory/2636-14-0x00007FFAE2C40000-0x00007FFAE3701000-memory.dmp

Filesize
10.8MB

Download
memory/4752-0-0x00007FFAE2C43000-0x00007FFAE2C45000-memory.dmp

Filesize
8KB

Download
memory/4752-1-0x0000000000EB0000-0x00000000011D4000-memory.dmp

Filesize
3.1MB

Download
memory/4752-2-0x00007FFAE2C40000-0x00007FFAE3701000-memory.dmp

Filesize
10.8MB

Download
memory/4752-9-0x00007FFAE2C40000-0x00007FFAE3701000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads