quasar | 9b4a5a44a932c5c42086a5989f87a5261ab8e6e96bc8ea2c0cf7ca6de68bc7ad

Analysis

max time kernel
149s
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
17-12-2024 04:07

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General

Target

9b4a5a44a932c5c42086a5989f87a5261ab8e6e96bc8ea2c0cf7ca6de68bc7ad.exe
Size

3.1MB
MD5

dbde842faf140037f07cad5bd09771e9
SHA1

64dbcaf7d1e664556b5fd82e0e8b8efeae38dea0
SHA256

9b4a5a44a932c5c42086a5989f87a5261ab8e6e96bc8ea2c0cf7ca6de68bc7ad
SHA512

8a970a2ef3e0bcf378acce7a748289b8cdc68c5ff7b50d940dd4ce1f94c9790e9be6a440e1baf57e5fab8a6d767d4a1ddbe6b2244c23a95f91f553af32339885
SSDEEP

49152:hveI22SsaNYfdPBldt698dBcjHDCG1JELoGdXTHHB72eh2NT:hvT22SsaNYfdPBldt6+dBcjHDC3

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.68.104:4782

Mutex

93aae856-95a8-4f87-bb5a-e035e00ec571

Attributes

encryption_key
A9BD88FEF9A2EA52A07F5C37D168C315C868BC60
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Antimalware Core Service
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/4412-1-0x0000000000B70000-0x0000000000E94000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c86-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4928	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
4692	schtasks.exe
1092	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4412	9b4a5a44a932c5c42086a5989f87a5261ab8e6e96bc8ea2c0cf7ca6de68bc7ad.exe
Token: SeDebugPrivilege	4928	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
4928	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
4928	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4928	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4412 wrote to memory of 4692	4412	9b4a5a44a932c5c42086a5989f87a5261ab8e6e96bc8ea2c0cf7ca6de68bc7ad.exe	83
PID 4412 wrote to memory of 4692	4412	9b4a5a44a932c5c42086a5989f87a5261ab8e6e96bc8ea2c0cf7ca6de68bc7ad.exe	83
PID 4412 wrote to memory of 4928	4412	9b4a5a44a932c5c42086a5989f87a5261ab8e6e96bc8ea2c0cf7ca6de68bc7ad.exe	85
PID 4412 wrote to memory of 4928	4412	9b4a5a44a932c5c42086a5989f87a5261ab8e6e96bc8ea2c0cf7ca6de68bc7ad.exe	85
PID 4928 wrote to memory of 1092	4928	Client.exe	86
PID 4928 wrote to memory of 1092	4928	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\9b4a5a44a932c5c42086a5989f87a5261ab8e6e96bc8ea2c0cf7ca6de68bc7ad.exe
"C:\Users\Admin\AppData\Local\Temp\9b4a5a44a932c5c42086a5989f87a5261ab8e6e96bc8ea2c0cf7ca6de68bc7ad.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4412
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Antimalware Core Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4692
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4928
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Antimalware Core Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:1092

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
dbde842faf140037f07cad5bd09771e9

SHA1
64dbcaf7d1e664556b5fd82e0e8b8efeae38dea0

SHA256
9b4a5a44a932c5c42086a5989f87a5261ab8e6e96bc8ea2c0cf7ca6de68bc7ad

SHA512
8a970a2ef3e0bcf378acce7a748289b8cdc68c5ff7b50d940dd4ce1f94c9790e9be6a440e1baf57e5fab8a6d767d4a1ddbe6b2244c23a95f91f553af32339885

Download Submit
memory/4412-0-0x00007FF9E2CE3000-0x00007FF9E2CE5000-memory.dmp

Filesize
8KB

Download
memory/4412-1-0x0000000000B70000-0x0000000000E94000-memory.dmp

Filesize
3.1MB

Download
memory/4412-2-0x00007FF9E2CE0000-0x00007FF9E37A1000-memory.dmp

Filesize
10.8MB

Download
memory/4412-8-0x00007FF9E2CE0000-0x00007FF9E37A1000-memory.dmp

Filesize
10.8MB

Download
memory/4928-9-0x00007FF9E2CE0000-0x00007FF9E37A1000-memory.dmp

Filesize
10.8MB

Download
memory/4928-10-0x00007FF9E2CE0000-0x00007FF9E37A1000-memory.dmp

Filesize
10.8MB

Download
memory/4928-11-0x000000001BC50000-0x000000001BCA0000-memory.dmp

Filesize
320KB

Download
memory/4928-12-0x000000001BD60000-0x000000001BE12000-memory.dmp

Filesize
712KB

Download
memory/4928-13-0x00007FF9E2CE0000-0x00007FF9E37A1000-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