quasar | 8efce1455cb1ecf70efd19472b9215663687fd94cc16f6eac07592d27cf82ce1

General

Target

Client-built.exe
Size

3.1MB
MD5

d1f13629773443d07acf921fbba38982
SHA1

3cbd73a94e55487e683cac99297fd98a0570f1ca
SHA256

8efce1455cb1ecf70efd19472b9215663687fd94cc16f6eac07592d27cf82ce1
SHA512

3f0378c2407a8630d9b2a92015b41e450af2e7ae5a99b5d204005312f7d97a193e4c8a2796adb5a281f14a935893158820552952fe3c8e489a1de438fcd0f747
SSDEEP

49152:fvqlL26AaNeWgPhlmVqvMQ7XSKfdRJ68bR3LoGdTKTHHB72eh2NT:fvSL26AaNeWgPhlmVqkQ7XSKfdRJ6G

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.39:4782

Mutex

3b241461-adb5-459a-81b3-0e7413c3b174

Attributes

encryption_key
7928B7E8CF671D0E7D6DF9547E85C7460DB50B8D
install_name
fortnite1.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 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1680-1-0x0000000000360000-0x0000000000684000-memory.dmp	family_quasar
behavioral1/files/0x002a0000000195bd-6.dat	family_quasar
behavioral1/memory/1868-10-0x0000000000FF0000-0x0000000001314000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

fortnite1.exe

pid	Process
1868	fortnite1.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
2252	schtasks.exe
2932	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exefortnite1.exe

description	pid	Process
Token: SeDebugPrivilege	1680	Client-built.exe
Token: SeDebugPrivilege	1868	fortnite1.exe

Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

fortnite1.exe

pid	Process
1868	fortnite1.exe

Suspicious use of SendNotifyMessage 1 IoCs

Processes:

fortnite1.exe

pid	Process
1868	fortnite1.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

fortnite1.exe

pid	Process
1868	fortnite1.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-built.exefortnite1.exe

description	pid	Process	procid_target
PID 1680 wrote to memory of 2932	1680	Client-built.exe	30
PID 1680 wrote to memory of 2932	1680	Client-built.exe	30
PID 1680 wrote to memory of 2932	1680	Client-built.exe	30
PID 1680 wrote to memory of 1868	1680	Client-built.exe	32
PID 1680 wrote to memory of 1868	1680	Client-built.exe	32
PID 1680 wrote to memory of 1868	1680	Client-built.exe	32
PID 1868 wrote to memory of 2252	1868	fortnite1.exe	33
PID 1868 wrote to memory of 2252	1868	fortnite1.exe	33
PID 1868 wrote to memory of 2252	1868	fortnite1.exe	33

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:1680
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\fortnite1.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2932
- C:\Users\Admin\AppData\Roaming\SubDir\fortnite1.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\fortnite1.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:1868
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\fortnite1.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2252

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\fortnite1.exe

Filesize
3.1MB

MD5
d1f13629773443d07acf921fbba38982

SHA1
3cbd73a94e55487e683cac99297fd98a0570f1ca

SHA256
8efce1455cb1ecf70efd19472b9215663687fd94cc16f6eac07592d27cf82ce1

SHA512
3f0378c2407a8630d9b2a92015b41e450af2e7ae5a99b5d204005312f7d97a193e4c8a2796adb5a281f14a935893158820552952fe3c8e489a1de438fcd0f747

Download Submit
memory/1680-0-0x000007FEF5583000-0x000007FEF5584000-memory.dmp

Filesize
4KB

Download
memory/1680-1-0x0000000000360000-0x0000000000684000-memory.dmp

Filesize
3.1MB

Download
memory/1680-2-0x000007FEF5580000-0x000007FEF5F6C000-memory.dmp

Filesize
9.9MB

Download
memory/1680-8-0x000007FEF5580000-0x000007FEF5F6C000-memory.dmp

Filesize
9.9MB

Download
memory/1868-9-0x000007FEF5580000-0x000007FEF5F6C000-memory.dmp

Filesize
9.9MB

Download
memory/1868-10-0x0000000000FF0000-0x0000000001314000-memory.dmp

Filesize
3.1MB

Download
memory/1868-11-0x000007FEF5580000-0x000007FEF5F6C000-memory.dmp

Filesize
9.9MB

Download
memory/1868-12-0x000007FEF5580000-0x000007FEF5F6C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads