quasar | f4c8833b95732e318e0aa9264b6ec318f50154039775935798bbae9b9de6cafa

General

Target

Client-built.exe
Size

3.1MB
MD5

ae02283593dc891884170b46eb346a51
SHA1

7fbb3b77f2be8fe31bca479b857d18c421edc75c
SHA256

f4c8833b95732e318e0aa9264b6ec318f50154039775935798bbae9b9de6cafa
SHA512

a57e2643e9dd167bd53596ac8be751cb66f7b28b87462e7fded3ee83fa8c8b962822c217fa27692e1a5252e1e862bbb758bf42e3fc8aac755019670fbdb5b66a
SSDEEP

98304:ovxL26AaNeWgPhlmVqkQ7XSKmBRJ6BweYR:2/4SDEwpR

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

littlebirdyy-26683.portmap.host:26683

Mutex

91a6c51e-b9c8-459f-82b5-8fd3ea82ad14

Attributes

encryption_key
91837990C32A7683311E3E452264F10B98C1534B
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Microsoft Service
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3856-1-0x0000000000DC0000-0x00000000010EA000-memory.dmp	family_quasar
C:\Program Files\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

760 Client.exe

pid	process
760	Client.exe

Drops file in Program Files directory 5 IoCs

Processes:

Client.exeClient-built.exe

description	ioc	process
File opened for modification	C:\Program Files\SubDir	Client.exe
File created	C:\Program Files\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Program Files\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Program Files\SubDir	Client-built.exe
File opened for modification	C:\Program Files\SubDir\Client.exe	Client.exe

Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exeschtasks.exe

pid process

5060 schtasks.exe
2596 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description pid process

Token: SeDebugPrivilege 3856 Client-built.exe
Token: SeDebugPrivilege 760 Client.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid process

760 Client.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid process

760 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

760 Client.exe

pid	process
5060	schtasks.exe
2596	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	3856	Client-built.exe
Token: SeDebugPrivilege	760	Client.exe

pid	process
760	Client.exe

pid	process
760	Client.exe

pid	process
760	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exeClient.exe

description	pid	process	target process
PID 3856 wrote to memory of 5060	3856	Client-built.exe	schtasks.exe
PID 3856 wrote to memory of 5060	3856	Client-built.exe	schtasks.exe
PID 3856 wrote to memory of 760	3856	Client-built.exe	Client.exe
PID 3856 wrote to memory of 760	3856	Client-built.exe	Client.exe
PID 760 wrote to memory of 2596	760	Client.exe	schtasks.exe
PID 760 wrote to memory of 2596	760	Client.exe	schtasks.exe

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:3856

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Microsoft Service" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:5060

C:\Program Files\SubDir\Client.exe
"C:\Program Files\SubDir\Client.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:760

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Microsoft Service" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:2596

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4320,i,13879737908471496610,15335851594401413307,262144 --variations-seed-version --mojo-platform-channel-handle=1416 /prefetch:8
1⤵
PID:4812

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Program Files\SubDir\Client.exe

Filesize
3.1MB

MD5
ae02283593dc891884170b46eb346a51

SHA1
7fbb3b77f2be8fe31bca479b857d18c421edc75c

SHA256
f4c8833b95732e318e0aa9264b6ec318f50154039775935798bbae9b9de6cafa

SHA512
a57e2643e9dd167bd53596ac8be751cb66f7b28b87462e7fded3ee83fa8c8b962822c217fa27692e1a5252e1e862bbb758bf42e3fc8aac755019670fbdb5b66a

Download Submit
memory/760-10-0x00007FF842860000-0x00007FF843321000-memory.dmp

Filesize
10.8MB

Download
memory/760-11-0x00007FF842860000-0x00007FF843321000-memory.dmp

Filesize
10.8MB

Download
memory/760-12-0x000000001C4C0000-0x000000001C510000-memory.dmp

Filesize
320KB

Download
memory/760-13-0x000000001C5D0000-0x000000001C682000-memory.dmp

Filesize
712KB

Download
memory/760-14-0x00007FF842860000-0x00007FF843321000-memory.dmp

Filesize
10.8MB

Download
memory/3856-0-0x00007FF842863000-0x00007FF842865000-memory.dmp

Filesize
8KB

Download
memory/3856-1-0x0000000000DC0000-0x00000000010EA000-memory.dmp

Filesize
3.2MB

Download
memory/3856-2-0x00007FF842860000-0x00007FF843321000-memory.dmp

Filesize
10.8MB

Download
memory/3856-9-0x00007FF842860000-0x00007FF843321000-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