quasar | 7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1

General

Target

Client-built.exe
Size

3.1MB
MD5

11563580013b8994395ff739dc37ed4a
SHA1

c527a22166dc153687ca33a8d964687459a6b669
SHA256

7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1
SHA512

4047470a756067ca4a4a038c080039945f37220fba7554ecad5d4912d4ea8611bd5efa5f72bbc7084ecfdbee3d63e8a163b675639572e2b9f21253f4c6e93e59
SSDEEP

49152:6vRt62XlaSFNWPjljiFa2RoUYIfu83oGNZZpTHHB72eh2NT:6vb62XlaSFNWPjljiFXRoUYIfuC

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.70:4782

Mutex

4cacefbd-58c1-418c-9da0-e646e1e6fc72

Attributes

encryption_key
772212B3F3C08D6945CE72024D790AD46DD8341D
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
defender
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/2896-1-0x00000000009D0000-0x0000000000CF4000-memory.dmp	family_quasar
behavioral2/files/0x000f000000023b96-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3600	Client.exe

Drops file in System32 directory 5 IoCs

description	ioc	Process
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
File opened for modification	C:\Windows\system32\SubDir\Client.exe	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
4932	schtasks.exe
3696	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2896	Client-built.exe
Token: SeDebugPrivilege	3600	Client.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3600	Client.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3600	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3600	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2896 wrote to memory of 4932	2896	Client-built.exe	83
PID 2896 wrote to memory of 4932	2896	Client-built.exe	83
PID 2896 wrote to memory of 3600	2896	Client-built.exe	85
PID 2896 wrote to memory of 3600	2896	Client-built.exe	85
PID 3600 wrote to memory of 3696	3600	Client.exe	86
PID 3600 wrote to memory of 3696	3600	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:2896
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "defender" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4932
- 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:3600
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "defender" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3696

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
11563580013b8994395ff739dc37ed4a

SHA1
c527a22166dc153687ca33a8d964687459a6b669

SHA256
7f5817c430e3906dbf287f92d2f5b140272644d7b2e902d2a343cba51c5bc7e1

SHA512
4047470a756067ca4a4a038c080039945f37220fba7554ecad5d4912d4ea8611bd5efa5f72bbc7084ecfdbee3d63e8a163b675639572e2b9f21253f4c6e93e59

Download Submit
memory/2896-0-0x00007FFF34EC3000-0x00007FFF34EC5000-memory.dmp

Filesize
8KB

Download
memory/2896-1-0x00000000009D0000-0x0000000000CF4000-memory.dmp

Filesize
3.1MB

Download
memory/2896-2-0x00007FFF34EC0000-0x00007FFF35981000-memory.dmp

Filesize
10.8MB

Download
memory/2896-10-0x00007FFF34EC0000-0x00007FFF35981000-memory.dmp

Filesize
10.8MB

Download
memory/3600-9-0x00007FFF34EC0000-0x00007FFF35981000-memory.dmp

Filesize
10.8MB

Download
memory/3600-11-0x00007FFF34EC0000-0x00007FFF35981000-memory.dmp

Filesize
10.8MB

Download
memory/3600-12-0x000000001BF30000-0x000000001BF80000-memory.dmp

Filesize
320KB

Download
memory/3600-13-0x000000001C040000-0x000000001C0F2000-memory.dmp

Filesize
712KB

Download
memory/3600-14-0x00007FFF34EC0000-0x00007FFF35981000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads