quasar | 22694b738ce9d320755f0a5d0bb381568d75e3b463cf0fbe9578052b7177d7fd

General

Target

Client-built.exe
Size

3.1MB
MD5

cebfba08c10315f1861ac9470097cb62
SHA1

61fed68ff181a53942b9d44bc334d80412cec67e
SHA256

22694b738ce9d320755f0a5d0bb381568d75e3b463cf0fbe9578052b7177d7fd
SHA512

e81e4285b9f7c2345a24acb70b92935d97bfe5621d64b7ce0f7ea275cdedbfc8d9f0528ba572503207489ef6f045de9efaf26bcc0655501d1ccc460168a41b11
SSDEEP

49152:mvzI22SsaNYfdPBldt698dBcjHLgsndp7LoGdqTHHB72eh2NT:mvM22SsaNYfdPBldt6+dBcjHcsH

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.10.126:59006

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
behavioral2/memory/5448-1-0x00000000003E0000-0x0000000000704000-memory.dmp	family_quasar
behavioral2/files/0x00080000000242cc-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
776	pcimprover.exe

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File created	C:\Program Files\find\pcimprover.exe	Client-built.exe
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

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
5528	schtasks.exe
364	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	5448	Client-built.exe
Token: SeDebugPrivilege	776	pcimprover.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
776	pcimprover.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
776	pcimprover.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
776	pcimprover.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5448 wrote to memory of 5528	5448	Client-built.exe	89
PID 5448 wrote to memory of 5528	5448	Client-built.exe	89
PID 5448 wrote to memory of 776	5448	Client-built.exe	91
PID 5448 wrote to memory of 776	5448	Client-built.exe	91
PID 776 wrote to memory of 364	776	pcimprover.exe	92
PID 776 wrote to memory of 364	776	pcimprover.exe	92

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:5448
- 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:5528
- 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:776
- - 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:364

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
cebfba08c10315f1861ac9470097cb62

SHA1
61fed68ff181a53942b9d44bc334d80412cec67e

SHA256
22694b738ce9d320755f0a5d0bb381568d75e3b463cf0fbe9578052b7177d7fd

SHA512
e81e4285b9f7c2345a24acb70b92935d97bfe5621d64b7ce0f7ea275cdedbfc8d9f0528ba572503207489ef6f045de9efaf26bcc0655501d1ccc460168a41b11

Download Submit
memory/776-10-0x00007FFE67400000-0x00007FFE67EC1000-memory.dmp

Filesize
10.8MB

Download
memory/776-11-0x00007FFE67400000-0x00007FFE67EC1000-memory.dmp

Filesize
10.8MB

Download
memory/776-12-0x000000001C030000-0x000000001C080000-memory.dmp

Filesize
320KB

Download
memory/776-13-0x000000001C140000-0x000000001C1F2000-memory.dmp

Filesize
712KB

Download
memory/776-14-0x00007FFE67400000-0x00007FFE67EC1000-memory.dmp

Filesize
10.8MB

Download
memory/5448-0-0x00007FFE67403000-0x00007FFE67405000-memory.dmp

Filesize
8KB

Download
memory/5448-1-0x00000000003E0000-0x0000000000704000-memory.dmp

Filesize
3.1MB

Download
memory/5448-2-0x00007FFE67400000-0x00007FFE67EC1000-memory.dmp

Filesize
10.8MB

Download
memory/5448-9-0x00007FFE67400000-0x00007FFE67EC1000-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