quasar | 0a1af9ad6684d877f7c58b00bec90875ccfd709f547fe396a87a9c26e881977b

Analysis

max time kernel
126s
max time network
136s
platform
windows7_x64
resource
win7-20240611-en
resource tags

arch:x64arch:x86image:win7-20240611-enlocale:en-usos:windows7-x64system
submitted
30-06-2024 16:46

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General

Target

Client-built.exe
Size

3.1MB
MD5

4f56c5c10fd6d558874a09e5d4dbdffd
SHA1

5b9692b0cfc0da65752a7c6e98528a49ef1b17b9
SHA256

0a1af9ad6684d877f7c58b00bec90875ccfd709f547fe396a87a9c26e881977b
SHA512

699ff682370ee44a41af76686435f41682910d1291fbe159570f51e1aed05331dfce20074b3d5cd5937dfe6a8db651f8a4f320b4bf2fe2f38d585b8d4b95c8b4
SSDEEP

49152:GvnI22SsaNYfdPBldt698dBcjHnKmmmmzzRoGdJCTHHB72eh2NT:GvI22SsaNYfdPBldt6+dBcjHKmmh

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

86.137.1.84:4782

Mutex

adc301f6-35ca-4636-b286-ad2aef63f877

Attributes

encryption_key
54B7AB1A151267275EF24D335CE7E3B6ABDDC53E
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Microsoft Launcher Task Manager
subdirectory
SubDir

Signatures

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1124-1-0x0000000000F80000-0x00000000012A4000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
behavioral1/memory/2264-9-0x00000000012C0000-0x00000000015E4000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2264 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

2612 schtasks.exe
2740 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeClient.exe

description pid process

Token: SeDebugPrivilege 1124 Client-built.exe
Token: SeDebugPrivilege 2264 Client.exe
Suspicious use of FindShellTrayWindow 1 IoCs

Processes:

Client.exe

pid process

2264 Client.exe
Suspicious use of SendNotifyMessage 1 IoCs

Processes:

Client.exe

pid process

2264 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2264 Client.exe

pid	process
2264	Client.exe

pid	process
2612	schtasks.exe
2740	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	1124	Client-built.exe
Token: SeDebugPrivilege	2264	Client.exe

pid	process
2264	Client.exe

pid	process
2264	Client.exe

pid	process
2264	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

Client-built.exeClient.exe

description	pid	process	target process
PID 1124 wrote to memory of 2612	1124	Client-built.exe	schtasks.exe
PID 1124 wrote to memory of 2612	1124	Client-built.exe	schtasks.exe
PID 1124 wrote to memory of 2612	1124	Client-built.exe	schtasks.exe
PID 1124 wrote to memory of 2264	1124	Client-built.exe	Client.exe
PID 1124 wrote to memory of 2264	1124	Client-built.exe	Client.exe
PID 1124 wrote to memory of 2264	1124	Client-built.exe	Client.exe
PID 2264 wrote to memory of 2740	2264	Client.exe	schtasks.exe
PID 2264 wrote to memory of 2740	2264	Client.exe	schtasks.exe
PID 2264 wrote to memory of 2740	2264	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:1124

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Microsoft Launcher Task Manager" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Scheduled Task/Job: Scheduled Task
PID:2612

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:2264

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Microsoft Launcher Task Manager" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Scheduled Task/Job: Scheduled Task
PID:2740

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
4f56c5c10fd6d558874a09e5d4dbdffd

SHA1
5b9692b0cfc0da65752a7c6e98528a49ef1b17b9

SHA256
0a1af9ad6684d877f7c58b00bec90875ccfd709f547fe396a87a9c26e881977b

SHA512
699ff682370ee44a41af76686435f41682910d1291fbe159570f51e1aed05331dfce20074b3d5cd5937dfe6a8db651f8a4f320b4bf2fe2f38d585b8d4b95c8b4

Download Submit
memory/1124-0-0x000007FEF5703000-0x000007FEF5704000-memory.dmp

Filesize
4KB

Download
memory/1124-1-0x0000000000F80000-0x00000000012A4000-memory.dmp

Filesize
3.1MB

Download
memory/1124-2-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp

Filesize
9.9MB

Download
memory/1124-10-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp

Filesize
9.9MB

Download
memory/2264-8-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp

Filesize
9.9MB

Download
memory/2264-9-0x00000000012C0000-0x00000000015E4000-memory.dmp

Filesize
3.1MB

Download
memory/2264-11-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp

Filesize
9.9MB

Download
memory/2264-12-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp

Filesize
9.9MB

Download