quasar | 2ab4ac728381ffef7b917c6e2f9fd45cdbb753238552484b33990d101f90105d

Resubmissions

02-06-2024 02:14

240602-cn2b2afh82 10

02-06-2024 02:13

240602-cnmtmsfh64 10

Analysis

max time kernel
1793s
max time network
1799s
platform
windows11-21h2_x64
resource
win11-20240426-en
resource tags

arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
submitted
02-06-2024 02:13

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General

Target

Viber.exe
Size

3.3MB
MD5

9863fe2c29f2deb8b301f8180acdedf1
SHA1

105a2679bdf370905368427b16cb15d79c41a4da
SHA256

2ab4ac728381ffef7b917c6e2f9fd45cdbb753238552484b33990d101f90105d
SHA512

bc4b7f07e9b5679c178287c4bee466425c039e5ef49a9fd7b1af7952f96c5445bcfe254f9c6c2d5acbe8feede1d64a4f9bad81ebcf312ab99f3aa8b32fee3f16
SSDEEP

49152:8vzI22SsaNYfdPBldt698dBcjHdhZe0SMfGvoGddHTHHB72eh2NT:8vM22SsaNYfdPBldt6+dBcjHd3e0GN

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.100.4:4782

Mutex

ff281bf3-1641-40e1-b845-186b77f35b47

Attributes

encryption_key
F8B799D52937CC435CCEC057E69F8914153CFD83
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
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/3636-1-0x0000000000620000-0x000000000097A000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

4904 Client.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Viber.exeClient.exe

description pid process

Token: SeDebugPrivilege 3636 Viber.exe
Token: SeDebugPrivilege 4904 Client.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid process

4904 Client.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid process

4904 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

4904 Client.exe
Suspicious use of WriteProcessMemory 2 IoCs

Processes:

Viber.exe

description pid process target process

PID 3636 wrote to memory of 4904 3636 Viber.exe Client.exe
PID 3636 wrote to memory of 4904 3636 Viber.exe Client.exe

pid	process
4904	Client.exe

description	pid	process
Token: SeDebugPrivilege	3636	Viber.exe
Token: SeDebugPrivilege	4904	Client.exe

pid	process
4904	Client.exe

pid	process
4904	Client.exe

pid	process
4904	Client.exe

description	pid	process	target process
PID 3636 wrote to memory of 4904	3636	Viber.exe	Client.exe
PID 3636 wrote to memory of 4904	3636	Viber.exe	Client.exe

C:\Users\Admin\AppData\Local\Temp\Viber.exe
"C:\Users\Admin\AppData\Local\Temp\Viber.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3636

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
PID:4904

Network

MITRE ATT&CK Matrix

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.3MB

MD5
9863fe2c29f2deb8b301f8180acdedf1

SHA1
105a2679bdf370905368427b16cb15d79c41a4da

SHA256
2ab4ac728381ffef7b917c6e2f9fd45cdbb753238552484b33990d101f90105d

SHA512
bc4b7f07e9b5679c178287c4bee466425c039e5ef49a9fd7b1af7952f96c5445bcfe254f9c6c2d5acbe8feede1d64a4f9bad81ebcf312ab99f3aa8b32fee3f16

Download Submit
memory/3636-0-0x00007FF9B0D93000-0x00007FF9B0D95000-memory.dmp

Filesize
8KB

Download
memory/3636-1-0x0000000000620000-0x000000000097A000-memory.dmp

Filesize
3.4MB

Download
memory/3636-2-0x00007FF9B0D90000-0x00007FF9B1852000-memory.dmp

Filesize
10.8MB

Download
memory/3636-9-0x00007FF9B0D90000-0x00007FF9B1852000-memory.dmp

Filesize
10.8MB

Download
memory/4904-10-0x00007FF9B0D90000-0x00007FF9B1852000-memory.dmp

Filesize
10.8MB

Download
memory/4904-11-0x00007FF9B0D90000-0x00007FF9B1852000-memory.dmp

Filesize
10.8MB

Download
memory/4904-12-0x0000000003340000-0x0000000003390000-memory.dmp

Filesize
320KB

Download
memory/4904-13-0x000000001C2D0000-0x000000001C382000-memory.dmp

Filesize
712KB

Download
memory/4904-14-0x00007FF9B0D90000-0x00007FF9B1852000-memory.dmp

Filesize
10.8MB

Download