quasar | caec9710a0b801970b1ec71dcbf9a34d22be0ca849f0f63669cf738ba7203a38

Analysis

max time kernel
249s
max time network
265s
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 19:08

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General

Target

muyComplicado.exe
Size

3.1MB
MD5

7eff1184c3903963c84d0d12d22a3cbc
SHA1

e941fb5120adb93f36d1ba56e19d2141d0289740
SHA256

caec9710a0b801970b1ec71dcbf9a34d22be0ca849f0f63669cf738ba7203a38
SHA512

52ac53a4d8980ad2ed38043bdd79f83708d1effc0a56421036c7ceb3fea65e566f1585067b31e09743e66f435a8caed9d71f1a1e4e0c30372ffe48d7b600ce1d
SSDEEP

49152:rvyI22SsaNYfdPBldt698dBcjH6yRJ6vbR3LoGdxTHHB72eh2NT:rvf22SsaNYfdPBldt6+dBcjH6yRJ6B

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

190.104.116.8:4782

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
behavioral1/memory/3668-1-0x0000000000A90000-0x0000000000DB4000-memory.dmp	family_quasar
behavioral1/files/0x0028000000045076-3.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3888	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
660	schtasks.exe
2424	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3668	muyComplicado.exe
Token: SeDebugPrivilege	3888	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3888	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3668 wrote to memory of 660	3668	muyComplicado.exe	83
PID 3668 wrote to memory of 660	3668	muyComplicado.exe	83
PID 3668 wrote to memory of 3888	3668	muyComplicado.exe	85
PID 3668 wrote to memory of 3888	3668	muyComplicado.exe	85
PID 3888 wrote to memory of 2424	3888	Client.exe	86
PID 3888 wrote to memory of 2424	3888	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\muyComplicado.exe
"C:\Users\Admin\AppData\Local\Temp\muyComplicado.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3668
- 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:660
- 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:3888
- - 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:2424

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
7eff1184c3903963c84d0d12d22a3cbc

SHA1
e941fb5120adb93f36d1ba56e19d2141d0289740

SHA256
caec9710a0b801970b1ec71dcbf9a34d22be0ca849f0f63669cf738ba7203a38

SHA512
52ac53a4d8980ad2ed38043bdd79f83708d1effc0a56421036c7ceb3fea65e566f1585067b31e09743e66f435a8caed9d71f1a1e4e0c30372ffe48d7b600ce1d

Download Submit
memory/3668-0-0x00007FFFC44C3000-0x00007FFFC44C5000-memory.dmp

Filesize
8KB

Download
memory/3668-1-0x0000000000A90000-0x0000000000DB4000-memory.dmp

Filesize
3.1MB

Download
memory/3668-2-0x00007FFFC44C0000-0x00007FFFC4F82000-memory.dmp

Filesize
10.8MB

Download
memory/3668-9-0x00007FFFC44C0000-0x00007FFFC4F82000-memory.dmp

Filesize
10.8MB

Download
memory/3888-5-0x00007FFFC44C0000-0x00007FFFC4F82000-memory.dmp

Filesize
10.8MB

Download
memory/3888-6-0x00007FFFC44C0000-0x00007FFFC4F82000-memory.dmp

Filesize
10.8MB

Download
memory/3888-7-0x000000001CC10000-0x000000001CC60000-memory.dmp

Filesize
320KB

Download
memory/3888-8-0x000000001CD20000-0x000000001CDD2000-memory.dmp

Filesize
712KB

Download
memory/3888-10-0x00007FFFC44C0000-0x00007FFFC4F82000-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