quasar | cf69d61f1cba5ad3feb85ba91931d37ae5862eb2a7d5d9f5ab10b8817139cdcc

Analysis

max time kernel
148s
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
10/01/2025, 15:27

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General

Target

Updater.exe
Size

3.2MB
MD5

bde27400071e8114a50e49c7a7d5aca3
SHA1

e8ba2d9c033467c5b9bc68f3646da6d24ab18bec
SHA256

cf69d61f1cba5ad3feb85ba91931d37ae5862eb2a7d5d9f5ab10b8817139cdcc
SHA512

13be08ea18cc1859f5bcc2f8346d1772e232ab9380a80e20116183f880fc21999b520e91c1206faffbbd60111b12567e99ed4807d219d409f9848cd7c5596cbf
SSDEEP

49152:zvTI22SsaNYfdPBldt698dBcjH01xY1v4LoG2Y8THHB72eh2NT:zvs22SsaNYfdPBldt6+dBcjH01xj

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

nukedrust-59850.portmap.host:59850

Mutex

e18b24bb-41a4-4371-91a7-7a5c163c4d80

Attributes

encryption_key
D1BE981B0A025276CA1B60203BDCB46D48C43278
install_name
svchost.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Update.exe
subdirectory
modules

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/3060-1-0x0000000000B70000-0x0000000000EB0000-memory.dmp	family_quasar
behavioral2/files/0x000400000001e4e1-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2900	svchost.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\modules\svchost.exe	Updater.exe
File opened for modification	C:\Windows\system32\modules	Updater.exe
File opened for modification	C:\Windows\system32\modules\svchost.exe	svchost.exe
File opened for modification	C:\Windows\system32\modules	svchost.exe
File created	C:\Windows\system32\modules\svchost.exe	Updater.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
2764	schtasks.exe
1376	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3060	Updater.exe
Token: SeDebugPrivilege	2900	svchost.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2900	svchost.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3060 wrote to memory of 1376	3060	Updater.exe	85
PID 3060 wrote to memory of 1376	3060	Updater.exe	85
PID 3060 wrote to memory of 2900	3060	Updater.exe	87
PID 3060 wrote to memory of 2900	3060	Updater.exe	87
PID 2900 wrote to memory of 2764	2900	svchost.exe	88
PID 2900 wrote to memory of 2764	2900	svchost.exe	88

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\Updater.exe
"C:\Users\Admin\AppData\Local\Temp\Updater.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3060
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Update.exe" /sc ONLOGON /tr "C:\Windows\system32\modules\svchost.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1376
- C:\Windows\system32\modules\svchost.exe
  "C:\Windows\system32\modules\svchost.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2900
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Update.exe" /sc ONLOGON /tr "C:\Windows\system32\modules\svchost.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2764

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:\Windows\System32\modules\svchost.exe

Filesize
3.2MB

MD5
bde27400071e8114a50e49c7a7d5aca3

SHA1
e8ba2d9c033467c5b9bc68f3646da6d24ab18bec

SHA256
cf69d61f1cba5ad3feb85ba91931d37ae5862eb2a7d5d9f5ab10b8817139cdcc

SHA512
13be08ea18cc1859f5bcc2f8346d1772e232ab9380a80e20116183f880fc21999b520e91c1206faffbbd60111b12567e99ed4807d219d409f9848cd7c5596cbf

Download Submit
memory/2900-9-0x00007FFD64AA0000-0x00007FFD65561000-memory.dmp

Filesize
10.8MB

Download
memory/2900-11-0x000000001BFA0000-0x000000001BFF0000-memory.dmp

Filesize
320KB

Download
memory/2900-12-0x000000001D8C0000-0x000000001D972000-memory.dmp

Filesize
712KB

Download
memory/2900-13-0x000000001D800000-0x000000001D812000-memory.dmp

Filesize
72KB

Download
memory/2900-14-0x000000001D860000-0x000000001D89C000-memory.dmp

Filesize
240KB

Download
memory/2900-15-0x00007FFD64AA0000-0x00007FFD65561000-memory.dmp

Filesize
10.8MB

Download
memory/3060-0-0x00007FFD64AA3000-0x00007FFD64AA5000-memory.dmp

Filesize
8KB

Download
memory/3060-1-0x0000000000B70000-0x0000000000EB0000-memory.dmp

Filesize
3.2MB

Download
memory/3060-2-0x00007FFD64AA0000-0x00007FFD65561000-memory.dmp

Filesize
10.8MB

Download
memory/3060-10-0x00007FFD64AA0000-0x00007FFD65561000-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