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 3 IoCs

resource	yara_rule
behavioral1/memory/2860-1-0x00000000012B0000-0x00000000015D4000-memory.dmp	family_quasar
behavioral1/files/0x002f000000018bd7-6.dat	family_quasar
behavioral1/memory/3060-9-0x0000000000CC0000-0x0000000000FE4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
3060	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
2912	schtasks.exe
2924	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2860	Client-built.exe
Token: SeDebugPrivilege	3060	pcimprover.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
3060	pcimprover.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
3060	pcimprover.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3060	pcimprover.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2860 wrote to memory of 2912	2860	Client-built.exe	30
PID 2860 wrote to memory of 2912	2860	Client-built.exe	30
PID 2860 wrote to memory of 2912	2860	Client-built.exe	30
PID 2860 wrote to memory of 3060	2860	Client-built.exe	32
PID 2860 wrote to memory of 3060	2860	Client-built.exe	32
PID 2860 wrote to memory of 3060	2860	Client-built.exe	32
PID 3060 wrote to memory of 2924	3060	pcimprover.exe	33
PID 3060 wrote to memory of 2924	3060	pcimprover.exe	33
PID 3060 wrote to memory of 2924	3060	pcimprover.exe	33

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:2860
- 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:2912
- 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:3060
- - 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:2924

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/2860-0-0x000007FEF6403000-0x000007FEF6404000-memory.dmp

Filesize
4KB

Download
memory/2860-1-0x00000000012B0000-0x00000000015D4000-memory.dmp

Filesize
3.1MB

Download
memory/2860-2-0x000007FEF6400000-0x000007FEF6DEC000-memory.dmp

Filesize
9.9MB

Download
memory/2860-8-0x000007FEF6400000-0x000007FEF6DEC000-memory.dmp

Filesize
9.9MB

Download
memory/3060-10-0x000007FEF6400000-0x000007FEF6DEC000-memory.dmp

Filesize
9.9MB

Download
memory/3060-9-0x0000000000CC0000-0x0000000000FE4000-memory.dmp

Filesize
3.1MB

Download
memory/3060-11-0x000007FEF6400000-0x000007FEF6DEC000-memory.dmp

Filesize
9.9MB

Download
memory/3060-12-0x000007FEF6400000-0x000007FEF6DEC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads