quasar | d9db91945538a06bb9f9fd23cdba8b769953b654486c9d6ef85e891c58df2ffd

General

Target

Client-built.exe
Size

3.1MB
MD5

73c23b1192bfd4f2fd59ca10523e13f2
SHA1

587f13586069971b5fb715a66aa498c36510a5dc
SHA256

d9db91945538a06bb9f9fd23cdba8b769953b654486c9d6ef85e891c58df2ffd
SHA512

07195c5b5f75aa682a5957e5f1bd440dd6b4cce1b6a4fd76ae0a9d621d8b32e25633178b71bffb02bb0c8af482dc00863e29a18e016694d8cfd5fb89740d32ec
SSDEEP

49152:HvLlL26AaNeWgPhlmVqvMQ7XSKOfsqIBe9joGARVTHHB72eh2NT:HvxL26AaNeWgPhlmVqkQ7XSKOEqZ

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.10.126:52427

94.31.108.129:52427

Mutex

8338883e-e167-4933-893d-9116970a5a7e

Attributes

encryption_key
FFFB8904E2A834B666E9B38240430975448158C8
install_name
pcimprover.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Microsoft-Imrpover
subdirectory
find

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/memory/2772-1-0x0000000000CB0000-0x0000000000FD4000-memory.dmp	family_quasar
behavioral1/files/0x000700000002429e-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
5580	pcimprover.exe

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\find\pcimprover.exe	Client-built.exe
File opened for modification	C:\Program Files\find	Client-built.exe
File opened for modification	C:\Program Files\find\pcimprover.exe	pcimprover.exe
File opened for modification	C:\Program Files\find	pcimprover.exe
File created	C:\Program Files\find\pcimprover.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
2348	schtasks.exe
6112	schtasks.exe

Suspicious behavior: LoadsDriver 6 IoCs

pid	Process
4	Process not Found
4	Process not Found
4	Process not Found
4	Process not Found
4	Process not Found
664	Process not Found

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2772	Client-built.exe
Token: SeDebugPrivilege	5580	pcimprover.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
5580	pcimprover.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
5580	pcimprover.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
5580	pcimprover.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2772 wrote to memory of 2348	2772	Client-built.exe	85
PID 2772 wrote to memory of 2348	2772	Client-built.exe	85
PID 2772 wrote to memory of 5580	2772	Client-built.exe	88
PID 2772 wrote to memory of 5580	2772	Client-built.exe	88
PID 5580 wrote to memory of 6112	5580	pcimprover.exe	89
PID 5580 wrote to memory of 6112	5580	pcimprover.exe	89

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 Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2772
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Microsoft-Imrpover" /sc ONLOGON /tr "C:\Program Files\find\pcimprover.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2348
- C:\Program Files\find\pcimprover.exe
  "C:\Program Files\find\pcimprover.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in Program Files directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of FindShellTrayWindow
  - Suspicious use of SendNotifyMessage
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:5580
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Microsoft-Imrpover" /sc ONLOGON /tr "C:\Program Files\find\pcimprover.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:6112

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:\Program Files\find\pcimprover.exe

Filesize
3.1MB

MD5
73c23b1192bfd4f2fd59ca10523e13f2

SHA1
587f13586069971b5fb715a66aa498c36510a5dc

SHA256
d9db91945538a06bb9f9fd23cdba8b769953b654486c9d6ef85e891c58df2ffd

SHA512
07195c5b5f75aa682a5957e5f1bd440dd6b4cce1b6a4fd76ae0a9d621d8b32e25633178b71bffb02bb0c8af482dc00863e29a18e016694d8cfd5fb89740d32ec

Download Submit
memory/2772-0-0x00007FF9245F3000-0x00007FF9245F5000-memory.dmp

Filesize
8KB

Download
memory/2772-1-0x0000000000CB0000-0x0000000000FD4000-memory.dmp

Filesize
3.1MB

Download
memory/2772-2-0x00007FF9245F0000-0x00007FF9250B1000-memory.dmp

Filesize
10.8MB

Download
memory/2772-9-0x00007FF9245F0000-0x00007FF9250B1000-memory.dmp

Filesize
10.8MB

Download
memory/5580-10-0x00007FF9245F0000-0x00007FF9250B1000-memory.dmp

Filesize
10.8MB

Download
memory/5580-11-0x00007FF9245F0000-0x00007FF9250B1000-memory.dmp

Filesize
10.8MB

Download
memory/5580-12-0x000000001C250000-0x000000001C2A0000-memory.dmp

Filesize
320KB

Download
memory/5580-13-0x000000001C360000-0x000000001C412000-memory.dmp

Filesize
712KB

Download
memory/5580-14-0x00007FF9245F0000-0x00007FF9250B1000-memory.dmp

Filesize
10.8MB

Download
memory/5580-15-0x00007FF9245F0000-0x00007FF9250B1000-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