quasar | 8ddc45e76a22fea557868cc10562e4b63bc7c824dad9fcccdbaa5a813b679acc

General

Target

Client-built.exe
Size

3.1MB
MD5

7678d644944930e21d507388397b58e9
SHA1

d4e6ccc7799dcddcca125f693332fa0d2eaec633
SHA256

8ddc45e76a22fea557868cc10562e4b63bc7c824dad9fcccdbaa5a813b679acc
SHA512

2767f9a907d2936d17e5e91ef8d86728e1b9a5fc26eb94206958bf3820ec5cf2704e6c2f05bfbc5717afb382dd908ba6cbd8b0a7fb3720770e57e57b41664871
SSDEEP

49152:ev9t62XlaSFNWPjljiFa2RoUYIaxmriMfbLoGd6THHB72eh2NT:ev/62XlaSFNWPjljiFXRoUYIaxmrV

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.0.19:4782

Mutex

661876a4-75f0-45b4-b622-5207e929a109

Attributes

encryption_key
CA0623419E058E855A1DFBA27E90975947AE225F
install_name
Client.exe
log_directory
Logs
reconnect_delay
50
startup_key
SubDir
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/4784-1-0x0000000000380000-0x00000000006A4000-memory.dmp	family_quasar
behavioral2/files/0x0007000000023c7d-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
1160	Client.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client.exe
File opened for modification	C:\Windows\system32\SubDir	Client.exe
File created	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Windows\system32\SubDir	Client-built.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
2136	schtasks.exe
4624	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4784	Client-built.exe
Token: SeDebugPrivilege	1160	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
1160	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
1160	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1160	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4784 wrote to memory of 2136	4784	Client-built.exe	83
PID 4784 wrote to memory of 2136	4784	Client-built.exe	83
PID 4784 wrote to memory of 1160	4784	Client-built.exe	85
PID 4784 wrote to memory of 1160	4784	Client-built.exe	85
PID 1160 wrote to memory of 4624	1160	Client.exe	86
PID 1160 wrote to memory of 4624	1160	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\Client-built.exe
"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
1⤵
- Drops file in System32 directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4784
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "SubDir" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2136
- C:\Windows\system32\SubDir\Client.exe
  "C:\Windows\system32\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1160
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "SubDir" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4624

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:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
7678d644944930e21d507388397b58e9

SHA1
d4e6ccc7799dcddcca125f693332fa0d2eaec633

SHA256
8ddc45e76a22fea557868cc10562e4b63bc7c824dad9fcccdbaa5a813b679acc

SHA512
2767f9a907d2936d17e5e91ef8d86728e1b9a5fc26eb94206958bf3820ec5cf2704e6c2f05bfbc5717afb382dd908ba6cbd8b0a7fb3720770e57e57b41664871

Download Submit
memory/1160-10-0x00007FFD651D0000-0x00007FFD65C91000-memory.dmp

Filesize
10.8MB

Download
memory/1160-11-0x00007FFD651D0000-0x00007FFD65C91000-memory.dmp

Filesize
10.8MB

Download
memory/1160-12-0x000000001C550000-0x000000001C5A0000-memory.dmp

Filesize
320KB

Download
memory/1160-13-0x000000001C660000-0x000000001C712000-memory.dmp

Filesize
712KB

Download
memory/1160-14-0x00007FFD651D0000-0x00007FFD65C91000-memory.dmp

Filesize
10.8MB

Download
memory/4784-0-0x00007FFD651D3000-0x00007FFD651D5000-memory.dmp

Filesize
8KB

Download
memory/4784-1-0x0000000000380000-0x00000000006A4000-memory.dmp

Filesize
3.1MB

Download
memory/4784-2-0x00007FFD651D0000-0x00007FFD65C91000-memory.dmp

Filesize
10.8MB

Download
memory/4784-9-0x00007FFD651D0000-0x00007FFD65C91000-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