quasar | 83e0d63d5121160a9251331b4555350971eaeadfa31387d1e996689cbcd6b877

Analysis

max time kernel
126s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
16-01-2025 00:30

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General

Target

Client-built.exe
Size

3.1MB
MD5

09aeaab89c707b3844cf6360e21fc2c5
SHA1

9f594050887f3e9917643d88cfc0980867da2abd
SHA256

83e0d63d5121160a9251331b4555350971eaeadfa31387d1e996689cbcd6b877
SHA512

d5eefd2a16b733993a1ed1f3b4a28975ae3e8880a2090e3f70ad5337c748739ae312950dda95363eb6c6d6b324e97fec5a19b0d2feb357f119e38f0d9fcb03ec
SSDEEP

49152:avaY52fyaSZOrPWluWBuGG5g5hPiRJ6xbR3LoGdUTHHB72eh2NT:avv52fyaSZOrPWluWBDG5g5hPiRJ6T

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

10.0.0.85:4782

Mutex

70b15695-83fa-49d5-9ab7-d6837c0bfe04

Attributes

encryption_key
CE951E8DBE6E2FB19D206CC546AB1C2DB4750281
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Solara
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/4264-1-0x0000000000E50000-0x0000000001174000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c78-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4904	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
4680	schtasks.exe
4708	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4264	Client-built.exe
Token: SeDebugPrivilege	4904	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4904	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4264 wrote to memory of 4680	4264	Client-built.exe	82
PID 4264 wrote to memory of 4680	4264	Client-built.exe	82
PID 4264 wrote to memory of 4904	4264	Client-built.exe	84
PID 4264 wrote to memory of 4904	4264	Client-built.exe	84
PID 4904 wrote to memory of 4708	4904	Client.exe	86
PID 4904 wrote to memory of 4708	4904	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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4264
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Solara" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4680
- 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:4904
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Solara" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4708

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
09aeaab89c707b3844cf6360e21fc2c5

SHA1
9f594050887f3e9917643d88cfc0980867da2abd

SHA256
83e0d63d5121160a9251331b4555350971eaeadfa31387d1e996689cbcd6b877

SHA512
d5eefd2a16b733993a1ed1f3b4a28975ae3e8880a2090e3f70ad5337c748739ae312950dda95363eb6c6d6b324e97fec5a19b0d2feb357f119e38f0d9fcb03ec

Download Submit
memory/4264-0-0x00007FFFE6FD3000-0x00007FFFE6FD5000-memory.dmp

Filesize
8KB

Download
memory/4264-1-0x0000000000E50000-0x0000000001174000-memory.dmp

Filesize
3.1MB

Download
memory/4264-2-0x00007FFFE6FD0000-0x00007FFFE7A91000-memory.dmp

Filesize
10.8MB

Download
memory/4264-9-0x00007FFFE6FD0000-0x00007FFFE7A91000-memory.dmp

Filesize
10.8MB

Download
memory/4904-10-0x00007FFFE6FD0000-0x00007FFFE7A91000-memory.dmp

Filesize
10.8MB

Download
memory/4904-11-0x00007FFFE6FD0000-0x00007FFFE7A91000-memory.dmp

Filesize
10.8MB

Download
memory/4904-12-0x0000000002CA0000-0x0000000002CF0000-memory.dmp

Filesize
320KB

Download
memory/4904-13-0x000000001BFB0000-0x000000001C062000-memory.dmp

Filesize
712KB

Download
memory/4904-14-0x00007FFFE6FD0000-0x00007FFFE7A91000-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