quasar | 2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e

General

Target

f54598770f770d815c9707dd33518eac.exe
Size

3.1MB
MD5

f54598770f770d815c9707dd33518eac
SHA1

6acf4aaf1d74710ef92c0b99a4b263202fbefcb7
SHA256

2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e
SHA512

dc927e84c41121e43f281af15ede1dcce368f1f94e88b56c893a1dfda8aa412547fe5f77d46fcc6a9fc8842b860edf4b3a3c059919b460d0f8611035d9e42d36
SSDEEP

49152:SvyI22SsaNYfdPBldt698dBcjHutbXPEhNvJJaoGdwjTHHB72eh2NT:Svf22SsaNYfdPBldt6+dBcjHZhg

Score

10^/10

quasar office01 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office01

C2

www.exiles.site:14782

Mutex

a0f587a6-d40f-499d-8e9e-b0831e1cb678

Attributes

encryption_key
49BF5A48970D914C7E70F494A8E16B5EFA3AB6A0
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 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/844-0-0x0000000000320000-0x0000000000644000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
behavioral1/memory/2624-9-0x00000000008F0000-0x0000000000C14000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2624 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

3040 schtasks.exe
2672 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

f54598770f770d815c9707dd33518eac.exeClient.exe

description pid process

Token: SeDebugPrivilege 844 f54598770f770d815c9707dd33518eac.exe
Token: SeDebugPrivilege 2624 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2624 Client.exe

pid	process
2624	Client.exe

pid	process
3040	schtasks.exe
2672	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	844	f54598770f770d815c9707dd33518eac.exe
Token: SeDebugPrivilege	2624	Client.exe

pid	process
2624	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

f54598770f770d815c9707dd33518eac.exeClient.exe

description	pid	process	target process
PID 844 wrote to memory of 3040	844	f54598770f770d815c9707dd33518eac.exe	schtasks.exe
PID 844 wrote to memory of 3040	844	f54598770f770d815c9707dd33518eac.exe	schtasks.exe
PID 844 wrote to memory of 3040	844	f54598770f770d815c9707dd33518eac.exe	schtasks.exe
PID 844 wrote to memory of 2624	844	f54598770f770d815c9707dd33518eac.exe	Client.exe
PID 844 wrote to memory of 2624	844	f54598770f770d815c9707dd33518eac.exe	Client.exe
PID 844 wrote to memory of 2624	844	f54598770f770d815c9707dd33518eac.exe	Client.exe
PID 2624 wrote to memory of 2672	2624	Client.exe	schtasks.exe
PID 2624 wrote to memory of 2672	2624	Client.exe	schtasks.exe
PID 2624 wrote to memory of 2672	2624	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\f54598770f770d815c9707dd33518eac.exe
"C:\Users\Admin\AppData\Local\Temp\f54598770f770d815c9707dd33518eac.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:844

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:3040

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 SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2624

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:2672

Network

MITRE ATT&CK Matrix ATT&CK v13

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

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

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

MD5
f54598770f770d815c9707dd33518eac

SHA1
6acf4aaf1d74710ef92c0b99a4b263202fbefcb7

SHA256
2cb1adb73eda0d1c2dc62f7bc312add25cfcc04017d3998e11513c4d02b1150e

SHA512
dc927e84c41121e43f281af15ede1dcce368f1f94e88b56c893a1dfda8aa412547fe5f77d46fcc6a9fc8842b860edf4b3a3c059919b460d0f8611035d9e42d36

Download Submit
memory/844-0-0x0000000000320000-0x0000000000644000-memory.dmp

Filesize
3.1MB

Download
memory/844-1-0x000007FEF51D0000-0x000007FEF5BBC000-memory.dmp

Filesize
9.9MB

Download
memory/844-2-0x000000001B300000-0x000000001B380000-memory.dmp

Filesize
512KB

Download
memory/844-8-0x000007FEF51D0000-0x000007FEF5BBC000-memory.dmp

Filesize
9.9MB

Download
memory/2624-9-0x00000000008F0000-0x0000000000C14000-memory.dmp

Filesize
3.1MB

Download
memory/2624-10-0x000007FEF51D0000-0x000007FEF5BBC000-memory.dmp

Filesize
9.9MB

Download
memory/2624-11-0x000000001B0C0000-0x000000001B140000-memory.dmp

Filesize
512KB

Download
memory/2624-12-0x000007FEF51D0000-0x000007FEF5BBC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads