quasar | 9b4a5a44a932c5c42086a5989f87a5261ab8e6e96bc8ea2c0cf7ca6de68bc7ad

Analysis

max time kernel
128s
max time network
144s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
16-12-2024 06:37

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General

Target

installer.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/3128-1-0x0000000000C40000-0x0000000000F64000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b9d-7.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
976	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
1920	schtasks.exe
4840	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3128	installer.exe
Token: SeDebugPrivilege	976	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
976	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
976	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
976	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3128 wrote to memory of 1920	3128	installer.exe	82
PID 3128 wrote to memory of 1920	3128	installer.exe	82
PID 3128 wrote to memory of 976	3128	installer.exe	84
PID 3128 wrote to memory of 976	3128	installer.exe	84
PID 976 wrote to memory of 4840	976	Client.exe	85
PID 976 wrote to memory of 4840	976	Client.exe	85

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\installer.exe
"C:\Users\Admin\AppData\Local\Temp\installer.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3128
- 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:1920
- 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:976
- - 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:4840

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/976-9-0x00007FF96A280000-0x00007FF96AD41000-memory.dmp

Filesize
10.8MB

Download
memory/976-10-0x00007FF96A280000-0x00007FF96AD41000-memory.dmp

Filesize
10.8MB

Download
memory/976-11-0x000000001B6D0000-0x000000001B720000-memory.dmp

Filesize
320KB

Download
memory/976-12-0x000000001D690000-0x000000001D742000-memory.dmp

Filesize
712KB

Download
memory/976-13-0x00007FF96A280000-0x00007FF96AD41000-memory.dmp

Filesize
10.8MB

Download
memory/3128-0-0x00007FF96A283000-0x00007FF96A285000-memory.dmp

Filesize
8KB

Download
memory/3128-1-0x0000000000C40000-0x0000000000F64000-memory.dmp

Filesize
3.1MB

Download
memory/3128-2-0x00007FF96A280000-0x00007FF96AD41000-memory.dmp

Filesize
10.8MB

Download
memory/3128-8-0x00007FF96A280000-0x00007FF96AD41000-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