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 3 IoCs

resource	yara_rule
behavioral1/memory/2860-1-0x0000000000980000-0x0000000000CA4000-memory.dmp	family_quasar
behavioral1/files/0x0012000000016d52-6.dat	family_quasar
behavioral1/memory/2644-9-0x0000000000E30000-0x0000000001154000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
2644	pcimprover.exe

Drops file in Program Files directory 5 IoCs

description	ioc	Process
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
File opened for modification	C:\Program Files\find\pcimprover.exe	Client-built.exe
File opened for modification	C:\Program Files\find	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
2760	schtasks.exe
2804	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2860	Client-built.exe
Token: SeDebugPrivilege	2644	pcimprover.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2644	pcimprover.exe

Suspicious use of SendNotifyMessage 1 IoCs

pid	Process
2644	pcimprover.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2644	pcimprover.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2860 wrote to memory of 2760	2860	Client-built.exe	30
PID 2860 wrote to memory of 2760	2860	Client-built.exe	30
PID 2860 wrote to memory of 2760	2860	Client-built.exe	30
PID 2860 wrote to memory of 2644	2860	Client-built.exe	32
PID 2860 wrote to memory of 2644	2860	Client-built.exe	32
PID 2860 wrote to memory of 2644	2860	Client-built.exe	32
PID 2644 wrote to memory of 2804	2644	pcimprover.exe	33
PID 2644 wrote to memory of 2804	2644	pcimprover.exe	33
PID 2644 wrote to memory of 2804	2644	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:2760
- 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:2644
- - 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:2804

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/2644-8-0x000007FEF5A50000-0x000007FEF643C000-memory.dmp

Filesize
9.9MB

Download
memory/2644-9-0x0000000000E30000-0x0000000001154000-memory.dmp

Filesize
3.1MB

Download
memory/2644-10-0x000007FEF5A50000-0x000007FEF643C000-memory.dmp

Filesize
9.9MB

Download
memory/2644-12-0x000007FEF5A50000-0x000007FEF643C000-memory.dmp

Filesize
9.9MB

Download
memory/2860-0-0x000007FEF5A53000-0x000007FEF5A54000-memory.dmp

Filesize
4KB

Download
memory/2860-1-0x0000000000980000-0x0000000000CA4000-memory.dmp

Filesize
3.1MB

Download
memory/2860-2-0x000007FEF5A50000-0x000007FEF643C000-memory.dmp

Filesize
9.9MB

Download
memory/2860-11-0x000007FEF5A50000-0x000007FEF643C000-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