quasar | 27397e611181aeea033279de2b1ff98d6f3f7a1dd9e72f67bac35d94025d38ab

Analysis

max time kernel
149s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
17-11-2024 04:01

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General

Target

coldstart.exe
Size

3.1MB
MD5

f203168d523e70b35b8d3fc729c22144
SHA1

60232dde8f123dcb45453df4f29baf81fac3353a
SHA256

27397e611181aeea033279de2b1ff98d6f3f7a1dd9e72f67bac35d94025d38ab
SHA512

53c950febedae2a9cf6a64b86b7e3b9abf000641eb7f1c056bebcb8117889671a6569a2650dac4566f26e6ef531df40b23ca15425a5a005dbe30ce13f96e748a
SSDEEP

49152:CvbI22SsaNYfdPBldt698dBcjHbktwOBxgDoGdiSRTHHB72eh2NT:Cvk22SsaNYfdPBldt6+dBcjHSwR

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

10.211.55.25:4782

Mutex

bcdc82e5-0aef-44c0-9c1b-922134e29c07

Attributes

encryption_key
6A71CE09A1F29B83F2F2D2942418EC75697893A6
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

Processes:

resource	yara_rule
behavioral2/memory/3552-1-0x0000000000D70000-0x0000000001094000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

3960 Client.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
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

Processes:

schtasks.exeschtasks.exe

pid process

2840 schtasks.exe
3132 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

coldstart.exeClient.exe

description pid process

Token: SeDebugPrivilege 3552 coldstart.exe
Token: SeDebugPrivilege 3960 Client.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid process

3960 Client.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid process

3960 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

3960 Client.exe

pid	process
3960	Client.exe

pid	process
2840	schtasks.exe
3132	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	3552	coldstart.exe
Token: SeDebugPrivilege	3960	Client.exe

pid	process
3960	Client.exe

pid	process
3960	Client.exe

pid	process
3960	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

coldstart.exeClient.exe

description	pid	process	target process
PID 3552 wrote to memory of 2840	3552	coldstart.exe	schtasks.exe
PID 3552 wrote to memory of 2840	3552	coldstart.exe	schtasks.exe
PID 3552 wrote to memory of 3960	3552	coldstart.exe	Client.exe
PID 3552 wrote to memory of 3960	3552	coldstart.exe	Client.exe
PID 3960 wrote to memory of 3132	3960	Client.exe	schtasks.exe
PID 3960 wrote to memory of 3132	3960	Client.exe	schtasks.exe

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\coldstart.exe
"C:\Users\Admin\AppData\Local\Temp\coldstart.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3552
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2840
- 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 FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3960
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3132

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

System Information Discovery

T1082

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
f203168d523e70b35b8d3fc729c22144

SHA1
60232dde8f123dcb45453df4f29baf81fac3353a

SHA256
27397e611181aeea033279de2b1ff98d6f3f7a1dd9e72f67bac35d94025d38ab

SHA512
53c950febedae2a9cf6a64b86b7e3b9abf000641eb7f1c056bebcb8117889671a6569a2650dac4566f26e6ef531df40b23ca15425a5a005dbe30ce13f96e748a

Download Submit
memory/3552-0-0x00007FFA81943000-0x00007FFA81945000-memory.dmp

Filesize
8KB

Download
memory/3552-1-0x0000000000D70000-0x0000000001094000-memory.dmp

Filesize
3.1MB

Download
memory/3552-2-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/3552-12-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/3960-8-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/3960-9-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/3960-10-0x000000001C300000-0x000000001C350000-memory.dmp

Filesize
320KB

Download
memory/3960-11-0x000000001C410000-0x000000001C4C2000-memory.dmp

Filesize
712KB

Download
memory/3960-13-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download