quasar | 8e57548613e26bf0e7bed5a240dacb93e2bc28f9df50fb5bfe3251fe534e85f0

Analysis

max time kernel
13s
max time network
15s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
15-12-2024 18:51

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General

Target

MultiTool.exe
Size

3.1MB
MD5

4b7479abac927b19a8b495e323cfb583
SHA1

c8b5e498dcbc8eba2c551634c75cbd2a55444ef3
SHA256

8e57548613e26bf0e7bed5a240dacb93e2bc28f9df50fb5bfe3251fe534e85f0
SHA512

faa1bf133c8928920374a31dedfdaf6ed73df57e2b0af6d01cc6000b5be6a86e82dc3181efb52f32bc8952bc868e51c359ea7b70daa277030b45879369a1d915
SSDEEP

49152:bvzlL26AaNeWgPhlmVqvMQ7XSK8xac1J3hoGdHqTHHB72eh2NT:bvpL26AaNeWgPhlmVqkQ7XSK8xaq3

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.19:4782

Mutex

cbd5bb11-a5b0-4dee-8e4b-bb4f3dacc71d

Attributes

encryption_key
17F9A06104A1A84BB74B1E617E0D5896149A2953
install_name
ThunderClientExternal.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Defender
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/3108-1-0x00000000008C0000-0x0000000000BE4000-memory.dmp	family_quasar
behavioral2/files/0x000a000000023b68-8.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4584	ThunderClientExternal.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
2848	schtasks.exe
972	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3108	MultiTool.exe
Token: SeDebugPrivilege	4584	ThunderClientExternal.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4584	ThunderClientExternal.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3108 wrote to memory of 2848	3108	MultiTool.exe	84
PID 3108 wrote to memory of 2848	3108	MultiTool.exe	84
PID 3108 wrote to memory of 4584	3108	MultiTool.exe	86
PID 3108 wrote to memory of 4584	3108	MultiTool.exe	86
PID 4584 wrote to memory of 972	4584	ThunderClientExternal.exe	87
PID 4584 wrote to memory of 972	4584	ThunderClientExternal.exe	87

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\MultiTool.exe
"C:\Users\Admin\AppData\Local\Temp\MultiTool.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3108
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\ThunderClientExternal.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2848
- C:\Users\Admin\AppData\Roaming\SubDir\ThunderClientExternal.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\ThunderClientExternal.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4584
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\ThunderClientExternal.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:972

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\ThunderClientExternal.exe

Filesize
3.1MB

MD5
4b7479abac927b19a8b495e323cfb583

SHA1
c8b5e498dcbc8eba2c551634c75cbd2a55444ef3

SHA256
8e57548613e26bf0e7bed5a240dacb93e2bc28f9df50fb5bfe3251fe534e85f0

SHA512
faa1bf133c8928920374a31dedfdaf6ed73df57e2b0af6d01cc6000b5be6a86e82dc3181efb52f32bc8952bc868e51c359ea7b70daa277030b45879369a1d915

Download Submit
memory/3108-0-0x00007FFBB9E73000-0x00007FFBB9E75000-memory.dmp

Filesize
8KB

Download
memory/3108-1-0x00000000008C0000-0x0000000000BE4000-memory.dmp

Filesize
3.1MB

Download
memory/3108-2-0x00007FFBB9E70000-0x00007FFBBA931000-memory.dmp

Filesize
10.8MB

Download
memory/3108-10-0x00007FFBB9E70000-0x00007FFBBA931000-memory.dmp

Filesize
10.8MB

Download
memory/4584-9-0x00007FFBB9E70000-0x00007FFBBA931000-memory.dmp

Filesize
10.8MB

Download
memory/4584-11-0x00007FFBB9E70000-0x00007FFBBA931000-memory.dmp

Filesize
10.8MB

Download
memory/4584-12-0x000000001BF80000-0x000000001BFD0000-memory.dmp

Filesize
320KB

Download
memory/4584-13-0x000000001DF50000-0x000000001E002000-memory.dmp

Filesize
712KB

Download
memory/4584-14-0x00007FFBB9E70000-0x00007FFBBA931000-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