quasar | 457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978

Analysis

max time kernel
126s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
24-12-2024 15:31

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General

Target

87b488fc8f9760bc9182c32ef76be93c.exe
Size

3.1MB
MD5

87b488fc8f9760bc9182c32ef76be93c
SHA1

16c3c1c53963cfedb800515b70e27ca2b7dd79fd
SHA256

457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978
SHA512

30397f8eaf6444502e7e69463463c759711030b0b0ce6812f64f48dee7be6d4ba212045544396ef9e603248bb71a5e4a312eb70a6e7b541161a18301003d089c
SSDEEP

49152:evQI22SsaNYfdPBldt698dBcjHaLA3qarWboGdmhIOTHHB72eh2NT:evt22SsaNYfdPBldt6+dBcjHN3c

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

43.138.147.74:4782

Mutex

4b095ece-017a-46f8-874b-d1266394fa10

Attributes

encryption_key
AB08BB6743A540F991F118F0E7BF74E3D06D95A1
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/1948-1-0x0000000000920000-0x0000000000C44000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023cb1-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2712	Client.exe

Drops file in System32 directory 2 IoCs

description	ioc	Process
File created	C:\Windows\system32\SubDir\Client.exe	87b488fc8f9760bc9182c32ef76be93c.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	87b488fc8f9760bc9182c32ef76be93c.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
4928	schtasks.exe
5008	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1948	87b488fc8f9760bc9182c32ef76be93c.exe
Token: SeDebugPrivilege	2712	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2712	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1948 wrote to memory of 5008	1948	87b488fc8f9760bc9182c32ef76be93c.exe	82
PID 1948 wrote to memory of 5008	1948	87b488fc8f9760bc9182c32ef76be93c.exe	82
PID 1948 wrote to memory of 2712	1948	87b488fc8f9760bc9182c32ef76be93c.exe	84
PID 1948 wrote to memory of 2712	1948	87b488fc8f9760bc9182c32ef76be93c.exe	84
PID 2712 wrote to memory of 4928	2712	Client.exe	85
PID 2712 wrote to memory of 4928	2712	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\87b488fc8f9760bc9182c32ef76be93c.exe
"C:\Users\Admin\AppData\Local\Temp\87b488fc8f9760bc9182c32ef76be93c.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1948
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:5008
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2712
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4928

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\SubDir\Client.exe

Filesize
3.1MB

MD5
87b488fc8f9760bc9182c32ef76be93c

SHA1
16c3c1c53963cfedb800515b70e27ca2b7dd79fd

SHA256
457e291dc62946ab2dc1cb558ffca2e90e5ebbd4a27013c5a23930339aedb978

SHA512
30397f8eaf6444502e7e69463463c759711030b0b0ce6812f64f48dee7be6d4ba212045544396ef9e603248bb71a5e4a312eb70a6e7b541161a18301003d089c

Download Submit
memory/1948-0-0x00007FF9D5903000-0x00007FF9D5905000-memory.dmp

Filesize
8KB

Download
memory/1948-1-0x0000000000920000-0x0000000000C44000-memory.dmp

Filesize
3.1MB

Download
memory/1948-2-0x00007FF9D5900000-0x00007FF9D63C1000-memory.dmp

Filesize
10.8MB

Download
memory/1948-8-0x00007FF9D5900000-0x00007FF9D63C1000-memory.dmp

Filesize
10.8MB

Download
memory/2712-9-0x00007FF9D5900000-0x00007FF9D63C1000-memory.dmp

Filesize
10.8MB

Download
memory/2712-10-0x00007FF9D5900000-0x00007FF9D63C1000-memory.dmp

Filesize
10.8MB

Download
memory/2712-11-0x0000000002D90000-0x0000000002DE0000-memory.dmp

Filesize
320KB

Download
memory/2712-12-0x000000001D6E0000-0x000000001D792000-memory.dmp

Filesize
712KB

Download
memory/2712-13-0x00007FF9D5900000-0x00007FF9D63C1000-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