quasar | 3c929d7c2dfe5638f93422aa26f6b6ef06624d0f8daa49887db9aac351d7b9d4

Analysis

max time kernel
147s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
28/12/2024, 05:26

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General

Target

Cryptor/Client-built.exe
Size

3.1MB
MD5

ffde80003bb39e45f92460a84b343771
SHA1

1ada86e287115526fc12d74865de3ca0c59c8c08
SHA256

e057b678ff3bca92b8672af195249608bcb56cfd01c1980d14b7c3e4d6952c8b
SHA512

4ae9adb21f511b1d114d5258d24d5b138a387149c593ed0743ad644ddb9461a248919ed305dbaae6b9beed9ed4525f8ad23a653c4b6507e7a021ea05a35961b4
SSDEEP

49152:uvRt62XlaSFNWPjljiFa2RoUYI9yL37ar1LoGdZ+47UTHHB72eh2NT:uvb62XlaSFNWPjljiFXRoUYIA3O

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

127.0.0.1:4782

Mutex

b8be2b57-3322-4df8-967c-65aedf2d425d

Attributes

encryption_key
5871F8D84AF9E4D8F5ABACF2A5DD66E256B5A672
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
behavioral2/memory/3980-1-0x0000000000210000-0x0000000000534000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b77-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
228	Client.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\SubDir\Client.exe	Client-built.exe
File created	C:\Program Files\SubDir\Client.exe	Client-built.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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
3584	schtasks.exe
380	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3980	Client-built.exe
Token: SeDebugPrivilege	228	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
228	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
228	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
228	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3980 wrote to memory of 3584	3980	Client-built.exe	82
PID 3980 wrote to memory of 3584	3980	Client-built.exe	82
PID 3980 wrote to memory of 228	3980	Client-built.exe	84
PID 3980 wrote to memory of 228	3980	Client-built.exe	84
PID 228 wrote to memory of 380	228	Client.exe	85
PID 228 wrote to memory of 380	228	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\Cryptor\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Cryptor\Client-built.exe"
1⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3980
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3584
- C:\Program Files\SubDir\Client.exe
  "C:\Program Files\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:228
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:380

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

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Program Files\SubDir\Client.exe

Filesize
3.1MB

MD5
ffde80003bb39e45f92460a84b343771

SHA1
1ada86e287115526fc12d74865de3ca0c59c8c08

SHA256
e057b678ff3bca92b8672af195249608bcb56cfd01c1980d14b7c3e4d6952c8b

SHA512
4ae9adb21f511b1d114d5258d24d5b138a387149c593ed0743ad644ddb9461a248919ed305dbaae6b9beed9ed4525f8ad23a653c4b6507e7a021ea05a35961b4

Download Submit
memory/228-9-0x00007FFDBF310000-0x00007FFDBFDD1000-memory.dmp

Filesize
10.8MB

Download
memory/228-10-0x00007FFDBF310000-0x00007FFDBFDD1000-memory.dmp

Filesize
10.8MB

Download
memory/228-11-0x000000001C610000-0x000000001C660000-memory.dmp

Filesize
320KB

Download
memory/228-12-0x000000001C720000-0x000000001C7D2000-memory.dmp

Filesize
712KB

Download
memory/228-13-0x00007FFDBF310000-0x00007FFDBFDD1000-memory.dmp

Filesize
10.8MB

Download
memory/3980-0-0x00007FFDBF313000-0x00007FFDBF315000-memory.dmp

Filesize
8KB

Download
memory/3980-1-0x0000000000210000-0x0000000000534000-memory.dmp

Filesize
3.1MB

Download
memory/3980-2-0x00007FFDBF310000-0x00007FFDBFDD1000-memory.dmp

Filesize
10.8MB

Download
memory/3980-8-0x00007FFDBF310000-0x00007FFDBFDD1000-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