quasar | fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4

Analysis

max time kernel
145s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
31-10-2024 00:37

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General

Target

Client-built.exe
Size

3.1MB
MD5

dca77ba52c9e20bdb3fcb81657918f89
SHA1

7cec39d83783008bb9a151b2a71dbc1eb03a7bbf
SHA256

fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4
SHA512

30fe235a26fe74a1fe27caafe059ee5463790252b046a5e467a0d938f1b77a05c0850a37883066a0d4c7bbd11f1bf36bf7a35e4ef3da86d4f7b2c240f2d8929a
SSDEEP

49152:uv3I22SsaNYfdPBldt698dBcjHOezFXear1QoGdiWTHHB72eh2NT:uv422SsaNYfdPBldt6+dBcjHXZXK

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

10.127.1.2:1604

Mutex

93b40a09-fbd7-4b29-8423-560b40061e4f

Attributes

encryption_key
55EAC2BE7559DA6721E45ED8C2349D6EFC3C9EE2
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/3528-1-0x00000000001F0000-0x0000000000514000-memory.dmp	family_quasar
behavioral2/files/0x0008000000023c8f-5.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
528	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

pid	Process
4856	schtasks.exe
4564	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3528	Client-built.exe
Token: SeDebugPrivilege	528	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
528	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
528	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3528 wrote to memory of 4856	3528	Client-built.exe	87
PID 3528 wrote to memory of 4856	3528	Client-built.exe	87
PID 3528 wrote to memory of 528	3528	Client-built.exe	89
PID 3528 wrote to memory of 528	3528	Client-built.exe	89
PID 528 wrote to memory of 4564	528	Client.exe	91
PID 528 wrote to memory of 4564	528	Client.exe	91

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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3528
- 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:4856
- 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 WriteProcessMemory
  PID:528
- - 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:4564

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
dca77ba52c9e20bdb3fcb81657918f89

SHA1
7cec39d83783008bb9a151b2a71dbc1eb03a7bbf

SHA256
fc564833b7c6fc4e991eb80e075d1c36306b9828172609ad311216ec5fc647f4

SHA512
30fe235a26fe74a1fe27caafe059ee5463790252b046a5e467a0d938f1b77a05c0850a37883066a0d4c7bbd11f1bf36bf7a35e4ef3da86d4f7b2c240f2d8929a

Download Submit
memory/528-8-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp

Filesize
10.8MB

Download
memory/528-10-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp

Filesize
10.8MB

Download
memory/528-11-0x000000001C680000-0x000000001C6D0000-memory.dmp

Filesize
320KB

Download
memory/528-12-0x000000001C790000-0x000000001C842000-memory.dmp

Filesize
712KB

Download
memory/528-13-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp

Filesize
10.8MB

Download
memory/3528-0-0x00007FFA102C3000-0x00007FFA102C5000-memory.dmp

Filesize
8KB

Download
memory/3528-1-0x00000000001F0000-0x0000000000514000-memory.dmp

Filesize
3.1MB

Download
memory/3528-2-0x00007FFA102C0000-0x00007FFA10D81000-memory.dmp

Filesize
10.8MB

Download
memory/3528-9-0x00007FFA102C0000-0x00007FFA10D81000-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