quasar | e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3

Analysis

max time kernel
93s
max time network
143s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
10-12-2024 17:15

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General

Target

e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe
Size

3.1MB
MD5

e9a138d8c5ab2cccc8bf9976f66d30c8
SHA1

e996894168f0d4e852162d1290250dfa986310f8
SHA256

e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3
SHA512

5982fc759c8b1121ab5befaac53e1521931f06d276140195fa1fcbcd1069f546253e366ef4cc37245b3bc2ed60c4b8d0583f133a1264efd77938adf456a08ccc
SSDEEP

49152:fvrI22SsaNYfdPBldt698dBcjHCWvXE/sGkCqILo+dPVTHHB72eh2NT:fvU22SsaNYfdPBldt6+dBcjHCWvTm

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

Dystopian-62863.portmap.host:62863

Mutex

e1de8f9b-5a7a-4798-a6fb-c03591ef3442

Attributes

encryption_key
8C1BB32BFD240218BA0CB04D65341FB1FDE1E001
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
SubStart
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/2584-1-0x0000000000920000-0x0000000000C44000-memory.dmp	family_quasar
behavioral2/files/0x000b000000023b78-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
4752	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
3596	schtasks.exe
3792	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2584	e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe
Token: SeDebugPrivilege	4752	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4752	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2584 wrote to memory of 3596	2584	e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe	83
PID 2584 wrote to memory of 3596	2584	e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe	83
PID 2584 wrote to memory of 4752	2584	e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe	85
PID 2584 wrote to memory of 4752	2584	e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe	85
PID 4752 wrote to memory of 3792	4752	Client.exe	86
PID 4752 wrote to memory of 3792	4752	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\e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe
"C:\Users\Admin\AppData\Local\Temp\e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2584
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "SubStart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:3596
- 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:4752
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "SubStart" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3792

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
e9a138d8c5ab2cccc8bf9976f66d30c8

SHA1
e996894168f0d4e852162d1290250dfa986310f8

SHA256
e63b41bfdd3a89b6ebcfc05db158fdc399dbc081e49b01498831a62df34defc3

SHA512
5982fc759c8b1121ab5befaac53e1521931f06d276140195fa1fcbcd1069f546253e366ef4cc37245b3bc2ed60c4b8d0583f133a1264efd77938adf456a08ccc

Download Submit
memory/2584-10-0x00007FFB476E0000-0x00007FFB481A1000-memory.dmp

Filesize
10.8MB

Download
memory/2584-1-0x0000000000920000-0x0000000000C44000-memory.dmp

Filesize
3.1MB

Download
memory/2584-2-0x00007FFB476E0000-0x00007FFB481A1000-memory.dmp

Filesize
10.8MB

Download
memory/2584-0-0x00007FFB476E3000-0x00007FFB476E5000-memory.dmp

Filesize
8KB

Download
memory/4752-11-0x00007FFB476E0000-0x00007FFB481A1000-memory.dmp

Filesize
10.8MB

Download
memory/4752-9-0x00007FFB476E0000-0x00007FFB481A1000-memory.dmp

Filesize
10.8MB

Download
memory/4752-12-0x000000001BC30000-0x000000001BC80000-memory.dmp

Filesize
320KB

Download
memory/4752-13-0x000000001BD40000-0x000000001BDF2000-memory.dmp

Filesize
712KB

Download
memory/4752-16-0x000000001BCC0000-0x000000001BCD2000-memory.dmp

Filesize
72KB

Download
memory/4752-17-0x000000001C440000-0x000000001C47C000-memory.dmp

Filesize
240KB

Download
memory/4752-18-0x00007FFB476E0000-0x00007FFB481A1000-memory.dmp

Filesize
10.8MB

Download
memory/4752-20-0x00007FFB476E0000-0x00007FFB481A1000-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