quasar | b1c44de49c36d63e36b97e92454b023ca5bd940c373459cd545803eaf331f900

Analysis

max time kernel
138s
max time network
142s
platform
windows10-2004_x64
resource
win10v2004-20240611-en
resource tags

arch:x64arch:x86image:win10v2004-20240611-enlocale:en-usos:windows10-2004-x64system
submitted
30-06-2024 15:29

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General

Target

Client-built.exe
Size

3.1MB
MD5

1e48869d1ce254c1aba0e61aedcdba8e
SHA1

cf79b1e78d9e1616208e653c4df4eef3b9f7360b
SHA256

ca182b6ce56a01a69122b24469fe5ad78e0cda78caeb49e5a814e2ac5774a10a
SHA512

fc6469a2297258cd9723f2d6c795e78c5b065ed709384bb18fe0fb8255cb2760e0633ec2683652ef88abd87ac21ef1d31eee3fd35e64f464d4da0c205fdcb343
SSDEEP

49152:7vilL26AaNeWgPhlmVqvMQ7XSKeQ03far7ToGddTHHB72eh2NT:7vaL26AaNeWgPhlmVqkQ7XSKu3Y

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.150:4782

Mutex

4fa54cdc-4bee-4759-b0fd-21bb6d6f9eed

Attributes

encryption_key
99A3D9CE1DE6501187FC4C0E50EBB3FE8AD7B9A8
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Microsoft Task Manager Worker 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

behavioral4/memory/2952-1-0x0000000000050000-0x0000000000374000-memory.dmp family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar
Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2688 Client.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

Processes:

schtasks.exeschtasks.exe

pid process

4588 schtasks.exe
4040 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description pid process

Token: SeDebugPrivilege 2952 Client-built.exe
Token: SeDebugPrivilege 2688 Client.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid process

2688 Client.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid process

2688 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2688 Client.exe

resource	yara_rule
behavioral4/memory/2952-1-0x0000000000050000-0x0000000000374000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar

pid	process
2688	Client.exe

pid	process
4588	schtasks.exe
4040	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	2952	Client-built.exe
Token: SeDebugPrivilege	2688	Client.exe

pid	process
2688	Client.exe

pid	process
2688	Client.exe

pid	process
2688	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

Client-built.exeClient.exe

description	pid	process	target process
PID 2952 wrote to memory of 4588	2952	Client-built.exe	schtasks.exe
PID 2952 wrote to memory of 4588	2952	Client-built.exe	schtasks.exe
PID 2952 wrote to memory of 2688	2952	Client-built.exe	Client.exe
PID 2952 wrote to memory of 2688	2952	Client-built.exe	Client.exe
PID 2688 wrote to memory of 4040	2688	Client.exe	schtasks.exe
PID 2688 wrote to memory of 4040	2688	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⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2952

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Microsoft Task Manager Worker Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Scheduled Task/Job: Scheduled Task
PID:4588

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2688

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Microsoft Task Manager Worker Service" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Scheduled Task/Job: Scheduled Task
PID:4040

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:3336

Network

MITRE ATT&CK Matrix ATT&CK v13

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
3.1MB

MD5
1e48869d1ce254c1aba0e61aedcdba8e

SHA1
cf79b1e78d9e1616208e653c4df4eef3b9f7360b

SHA256
ca182b6ce56a01a69122b24469fe5ad78e0cda78caeb49e5a814e2ac5774a10a

SHA512
fc6469a2297258cd9723f2d6c795e78c5b065ed709384bb18fe0fb8255cb2760e0633ec2683652ef88abd87ac21ef1d31eee3fd35e64f464d4da0c205fdcb343

Download Submit
memory/2688-9-0x00007FFA6FAD0000-0x00007FFA70591000-memory.dmp

Filesize
10.8MB

Download
memory/2688-10-0x00007FFA6FAD0000-0x00007FFA70591000-memory.dmp

Filesize
10.8MB

Download
memory/2688-11-0x000000001CA70000-0x000000001CAC0000-memory.dmp

Filesize
320KB

Download
memory/2688-12-0x000000001CB80000-0x000000001CC32000-memory.dmp

Filesize
712KB

Download
memory/2688-14-0x00007FFA6FAD0000-0x00007FFA70591000-memory.dmp

Filesize
10.8MB

Download
memory/2952-0-0x00007FFA6FAD3000-0x00007FFA6FAD5000-memory.dmp

Filesize
8KB

Download
memory/2952-1-0x0000000000050000-0x0000000000374000-memory.dmp

Filesize
3.1MB

Download
memory/2952-2-0x00007FFA6FAD0000-0x00007FFA70591000-memory.dmp

Filesize
10.8MB

Download
memory/2952-13-0x00007FFA6FAD0000-0x00007FFA70591000-memory.dmp

Filesize
10.8MB

Download