quasar | ccb745604be1d8cfc578d2540f5d8e230fae74513a1ed5887bc492145b0cc8d0

Analysis

max time kernel
33s
max time network
37s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
06-11-2024 19:10

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General

Target

k.exe
Size

3.1MB
MD5

3496aafb518d56e7b703d35f05f30d81
SHA1

29aa1b9c975ee094d271e2048569667c32a07ca4
SHA256

ccb745604be1d8cfc578d2540f5d8e230fae74513a1ed5887bc492145b0cc8d0
SHA512

e3712523ebef6c867a7c037ba929e8dd45d452ab8ebc80dcb80df138a5420e574007e3ff0fdfc72496e24cb53756f0e2c3bb565fcc72c4cade130ece935b5bf7
SSDEEP

49152:KvyI22SsaNYfdPBldt698dBcjHA4fvXoGmqTHHB72eh2NT:Kvf22SsaNYfdPBldt6+dBcjHVfv

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

190.104.116.8:139

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

Processes:

resource	yara_rule
behavioral1/memory/1892-1-0x0000000000530000-0x0000000000854000-memory.dmp	family_quasar
behavioral1/files/0x002900000004505a-3.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
5064	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

Processes:

schtasks.exeschtasks.exe

pid	Process
2600	schtasks.exe
3900	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

k.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	1892	k.exe
Token: SeDebugPrivilege	5064	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid	Process
5064	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

k.exeClient.exe

description	pid	Process	procid_target
PID 1892 wrote to memory of 2600	1892	k.exe	85
PID 1892 wrote to memory of 2600	1892	k.exe	85
PID 1892 wrote to memory of 5064	1892	k.exe	87
PID 1892 wrote to memory of 5064	1892	k.exe	87
PID 5064 wrote to memory of 3900	5064	Client.exe	88
PID 5064 wrote to memory of 3900	5064	Client.exe	88

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\k.exe
"C:\Users\Admin\AppData\Local\Temp\k.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1892
- 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:2600
- 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:5064
- - 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:3900

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

Replay Monitor

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Downloads

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

Filesize
3.1MB

MD5
3496aafb518d56e7b703d35f05f30d81

SHA1
29aa1b9c975ee094d271e2048569667c32a07ca4

SHA256
ccb745604be1d8cfc578d2540f5d8e230fae74513a1ed5887bc492145b0cc8d0

SHA512
e3712523ebef6c867a7c037ba929e8dd45d452ab8ebc80dcb80df138a5420e574007e3ff0fdfc72496e24cb53756f0e2c3bb565fcc72c4cade130ece935b5bf7

Download Submit
memory/1892-0-0x00007FFFC4E53000-0x00007FFFC4E55000-memory.dmp

Filesize
8KB

Download
memory/1892-1-0x0000000000530000-0x0000000000854000-memory.dmp

Filesize
3.1MB

Download
memory/1892-2-0x00007FFFC4E50000-0x00007FFFC5912000-memory.dmp

Filesize
10.8MB

Download
memory/1892-5-0x00007FFFC4E50000-0x00007FFFC5912000-memory.dmp

Filesize
10.8MB

Download
memory/5064-6-0x00007FFFC4E50000-0x00007FFFC5912000-memory.dmp

Filesize
10.8MB

Download
memory/5064-7-0x00007FFFC4E50000-0x00007FFFC5912000-memory.dmp

Filesize
10.8MB

Download
memory/5064-8-0x000000001CEA0000-0x000000001CEF0000-memory.dmp

Filesize
320KB

Download
memory/5064-9-0x000000001CFB0000-0x000000001D062000-memory.dmp

Filesize
712KB

Download
memory/5064-10-0x00007FFFC4E50000-0x00007FFFC5912000-memory.dmp

Filesize
10.8MB

Download