quasar | f388ffe206b5de775298020541f201a9b055c3aad74cac27c33d392408cf12a0

Analysis

max time kernel
149s
max time network
151s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
15/12/2024, 17:56

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General

Target

Client-built.exe
Size

3.1MB
MD5

2e3c730553c130f030cec92a781f2633
SHA1

ae8a5a63a1a711b38d7dcfe3e91415fb42e058c4
SHA256

f388ffe206b5de775298020541f201a9b055c3aad74cac27c33d392408cf12a0
SHA512

c0784215cd1067051b47fe3f86e6059a410607a1cc9623377b887564220bf9046ec182705534521d9a30b6fc00e2e480a0e2a77457c7ec5098db01bf5e0d8327
SSDEEP

49152:Cv6Y52fyaSZOrPWluWBuGG5g5hJZRJ69bR3LoGdW4THHB72eh2NT:CvP52fyaSZOrPWluWBDG5g5hJZRJ6P

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

999:999

Mutex

5a13e01b-5094-4ae8-9e4e-7b96132114ba

Attributes

encryption_key
C98F5FD72C77D3C38A5C7ECBED91435EDD8177FE
install_name
Client.exe
log_directory
key
reconnect_delay
3000
startup_key
cloud
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/4404-1-0x0000000000B10000-0x0000000000E34000-memory.dmp	family_quasar
behavioral1/files/0x001c00000002aaa5-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3836	Client.exe

Drops file in System32 directory 4 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir	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
3440	schtasks.exe
1008	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4404	Client-built.exe
Token: SeDebugPrivilege	3836	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3836	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4404 wrote to memory of 3440	4404	Client-built.exe	77
PID 4404 wrote to memory of 3440	4404	Client-built.exe	77
PID 4404 wrote to memory of 3836	4404	Client-built.exe	79
PID 4404 wrote to memory of 3836	4404	Client-built.exe	79
PID 3836 wrote to memory of 1008	3836	Client.exe	80
PID 3836 wrote to memory of 1008	3836	Client.exe	80

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⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4404
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "cloud" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3440
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3836
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "cloud" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1008

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:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
2e3c730553c130f030cec92a781f2633

SHA1
ae8a5a63a1a711b38d7dcfe3e91415fb42e058c4

SHA256
f388ffe206b5de775298020541f201a9b055c3aad74cac27c33d392408cf12a0

SHA512
c0784215cd1067051b47fe3f86e6059a410607a1cc9623377b887564220bf9046ec182705534521d9a30b6fc00e2e480a0e2a77457c7ec5098db01bf5e0d8327

Download Submit
memory/3836-8-0x00007FFD97710000-0x00007FFD981D2000-memory.dmp

Filesize
10.8MB

Download
memory/3836-10-0x00007FFD97710000-0x00007FFD981D2000-memory.dmp

Filesize
10.8MB

Download
memory/3836-11-0x000000001C150000-0x000000001C1A0000-memory.dmp

Filesize
320KB

Download
memory/3836-12-0x000000001C260000-0x000000001C312000-memory.dmp

Filesize
712KB

Download
memory/3836-13-0x00007FFD97710000-0x00007FFD981D2000-memory.dmp

Filesize
10.8MB

Download
memory/4404-0-0x00007FFD97713000-0x00007FFD97715000-memory.dmp

Filesize
8KB

Download
memory/4404-1-0x0000000000B10000-0x0000000000E34000-memory.dmp

Filesize
3.1MB

Download
memory/4404-2-0x00007FFD97710000-0x00007FFD981D2000-memory.dmp

Filesize
10.8MB

Download
memory/4404-9-0x00007FFD97710000-0x00007FFD981D2000-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