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 3 IoCs

resource	yara_rule
behavioral1/memory/1964-1-0x0000000000920000-0x0000000000C44000-memory.dmp	family_quasar
behavioral1/files/0x0016000000018657-6.dat	family_quasar
behavioral1/memory/2380-10-0x0000000000FB0000-0x00000000012D4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2380	Client.exe

Drops file in System32 directory 5 IoCs

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

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
2404	schtasks.exe
2152	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1964	Client-built.exe
Token: SeDebugPrivilege	2380	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2380	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2380	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2380	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1964 wrote to memory of 2404	1964	Client-built.exe	30
PID 1964 wrote to memory of 2404	1964	Client-built.exe	30
PID 1964 wrote to memory of 2404	1964	Client-built.exe	30
PID 1964 wrote to memory of 2380	1964	Client-built.exe	32
PID 1964 wrote to memory of 2380	1964	Client-built.exe	32
PID 1964 wrote to memory of 2380	1964	Client-built.exe	32
PID 2380 wrote to memory of 2152	2380	Client.exe	34
PID 2380 wrote to memory of 2152	2380	Client.exe	34
PID 2380 wrote to memory of 2152	2380	Client.exe	34

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:1964
- 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:2404
- 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:2380
- - 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:2152

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Windows\System32\SubDir\Client.exe

Filesize
3.1MB

MD5
7678d644944930e21d507388397b58e9

SHA1
d4e6ccc7799dcddcca125f693332fa0d2eaec633

SHA256
8ddc45e76a22fea557868cc10562e4b63bc7c824dad9fcccdbaa5a813b679acc

SHA512
2767f9a907d2936d17e5e91ef8d86728e1b9a5fc26eb94206958bf3820ec5cf2704e6c2f05bfbc5717afb382dd908ba6cbd8b0a7fb3720770e57e57b41664871

Download Submit
memory/1964-0-0x000007FEF5903000-0x000007FEF5904000-memory.dmp

Filesize
4KB

Download
memory/1964-1-0x0000000000920000-0x0000000000C44000-memory.dmp

Filesize
3.1MB

Download
memory/1964-2-0x000007FEF5900000-0x000007FEF62EC000-memory.dmp

Filesize
9.9MB

Download
memory/1964-8-0x000007FEF5900000-0x000007FEF62EC000-memory.dmp

Filesize
9.9MB

Download
memory/2380-9-0x000007FEF5900000-0x000007FEF62EC000-memory.dmp

Filesize
9.9MB

Download
memory/2380-10-0x0000000000FB0000-0x00000000012D4000-memory.dmp

Filesize
3.1MB

Download
memory/2380-11-0x000007FEF5900000-0x000007FEF62EC000-memory.dmp

Filesize
9.9MB

Download
memory/2380-12-0x000007FEF5900000-0x000007FEF62EC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads