quasar | 0580735fb9ce4e11f6e20041dbf837e43c10012391277339cac60ad7bec4db9a

Analysis

max time kernel
27s
max time network
35s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
18-05-2024 17:06

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General

Target

VirusMaker.exe
Size

3.1MB
MD5

baa8a99d97d03602397dbfafe2d59a66
SHA1

15d7de25b0c256f3f490512191c3150054c29793
SHA256

0580735fb9ce4e11f6e20041dbf837e43c10012391277339cac60ad7bec4db9a
SHA512

900c7b316ded642a3e41f11d07d486cafc23770782ba9beedf42a69a89591913a2dccff4e95e0f43cfb949e59d63d598475be9f15413756e5371bfac831be89e
SSDEEP

49152:6vkt62XlaSFNWPjljiFa2RoUYI17xNESEQk/iVLoGdeEPETHHB72eh2NT:6v462XlaSFNWPjljiFXRoUYI1xbtt

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.1.12:4782

Mutex

46113e25-df6e-4a96-919f-3f0b0ebb89e3

Attributes

encryption_key
19B2878E7111F70CAD1E17A936917EF8A8ABB80A
install_name
VirusMaker.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Microsoft Edge
subdirectory
SubDir

Signatures

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

Quasar payload 2 IoCs

Processes:

resource	yara_rule
behavioral1/memory/4600-1-0x00000000009D0000-0x0000000000CF4000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\VirusMaker.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

VirusMaker.exe

pid process

1056 VirusMaker.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

4420 schtasks.exe
964 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

VirusMaker.exeVirusMaker.exe

description pid process

Token: SeDebugPrivilege 4600 VirusMaker.exe
Token: SeDebugPrivilege 1056 VirusMaker.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

VirusMaker.exe

pid process

1056 VirusMaker.exe

pid	process
1056	VirusMaker.exe

pid	process
4420	schtasks.exe
964	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	4600	VirusMaker.exe
Token: SeDebugPrivilege	1056	VirusMaker.exe

pid	process
1056	VirusMaker.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

VirusMaker.exeVirusMaker.exe

description	pid	process	target process
PID 4600 wrote to memory of 4420	4600	VirusMaker.exe	schtasks.exe
PID 4600 wrote to memory of 4420	4600	VirusMaker.exe	schtasks.exe
PID 4600 wrote to memory of 1056	4600	VirusMaker.exe	VirusMaker.exe
PID 4600 wrote to memory of 1056	4600	VirusMaker.exe	VirusMaker.exe
PID 1056 wrote to memory of 964	1056	VirusMaker.exe	schtasks.exe
PID 1056 wrote to memory of 964	1056	VirusMaker.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\VirusMaker.exe
"C:\Users\Admin\AppData\Local\Temp\VirusMaker.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4600

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Microsoft Edge" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\VirusMaker.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:4420

C:\Users\Admin\AppData\Roaming\SubDir\VirusMaker.exe
"C:\Users\Admin\AppData\Roaming\SubDir\VirusMaker.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1056

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Microsoft Edge" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\VirusMaker.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:964

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\VirusMaker.exe.log

Filesize
1KB

MD5
b4e91d2e5f40d5e2586a86cf3bb4df24

SHA1
31920b3a41aa4400d4a0230a7622848789b38672

SHA256
5d8af3c7519874ed42a0d74ee559ae30d9cc6930aef213079347e2b47092c210

SHA512
968751b79a98961f145de48d425ea820fd1875bae79a725adf35fc8f4706c103ee0c7babd4838166d8a0dda9fbce3728c0265a04c4b37f335ec4eaa110a2b319

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\VirusMaker.exe

Filesize
3.1MB

MD5
baa8a99d97d03602397dbfafe2d59a66

SHA1
15d7de25b0c256f3f490512191c3150054c29793

SHA256
0580735fb9ce4e11f6e20041dbf837e43c10012391277339cac60ad7bec4db9a

SHA512
900c7b316ded642a3e41f11d07d486cafc23770782ba9beedf42a69a89591913a2dccff4e95e0f43cfb949e59d63d598475be9f15413756e5371bfac831be89e

Download Submit
memory/1056-11-0x00007FF909990000-0x00007FF90A452000-memory.dmp

Filesize
10.8MB

Download
memory/1056-12-0x00007FF909990000-0x00007FF90A452000-memory.dmp

Filesize
10.8MB

Download
memory/1056-13-0x000000001B830000-0x000000001B880000-memory.dmp

Filesize
320KB

Download
memory/1056-14-0x000000001B940000-0x000000001B9F2000-memory.dmp

Filesize
712KB

Download
memory/1056-15-0x00007FF909990000-0x00007FF90A452000-memory.dmp

Filesize
10.8MB

Download
memory/4600-0-0x00007FF909993000-0x00007FF909995000-memory.dmp

Filesize
8KB

Download
memory/4600-1-0x00000000009D0000-0x0000000000CF4000-memory.dmp

Filesize
3.1MB

Download
memory/4600-2-0x00007FF909990000-0x00007FF90A452000-memory.dmp

Filesize
10.8MB

Download
memory/4600-10-0x00007FF909990000-0x00007FF90A452000-memory.dmp

Filesize
10.8MB

Download