quasar | 5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959

Analysis

max time kernel
149s
max time network
141s
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 21:50

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General

Target

5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe
Size

3.1MB
MD5

4f107e95a9c20b41ef4e602ec661d3f1
SHA1

429db6828d2152b818f5db9f0574e867dcaf2f6b
SHA256

5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959
SHA512

b8bc51d250bd443347a52211b4bb1075c8a7b89d3e190d0efd093b3f74e7d2e2c041eaea62798484ab0a9d7da4a81c62f42172b6dacd190bd5a54de706b75f13
SSDEEP

49152:avkt62XlaSFNWPjljiFa2RoUYI6se2ErsSk/uhaoGdS/THHB72eh2NT:av462XlaSFNWPjljiFXRoUYI6seP8i

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.217:4782

Mutex

3945cd6c-7a48-4953-891b-b572e6546d28

Attributes

encryption_key
0424D13FAB664773413CCE167A339263D182142D
install_name
Sigma.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Javaxxx
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar payload 2 IoCs

Processes:

resource yara_rule

behavioral2/memory/3604-1-0x0000000000D00000-0x0000000001024000-memory.dmp family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Sigma.exe family_quasar

resource	yara_rule
behavioral2/memory/3604-1-0x0000000000D00000-0x0000000001024000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Sigma.exe	family_quasar

Detects Windows executables referencing non-Windows User-Agents 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3604-1-0x0000000000D00000-0x0000000001024000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
C:\Users\Admin\AppData\Roaming\SubDir\Sigma.exe	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3604-1-0x0000000000D00000-0x0000000001024000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
C:\Users\Admin\AppData\Roaming\SubDir\Sigma.exe	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects executables containing common artifacts observed in infostealers 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3604-1-0x0000000000D00000-0x0000000001024000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer
C:\Users\Admin\AppData\Roaming\SubDir\Sigma.exe	INDICATOR_SUSPICIOUS_GENInfoStealer

Executes dropped EXE 1 IoCs

Processes:

Sigma.exe

pid process

3260 Sigma.exe
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

3460 schtasks.exe
4448 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exeSigma.exe

description pid process

Token: SeDebugPrivilege 3604 5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe
Token: SeDebugPrivilege 3260 Sigma.exe

pid	process
3260	Sigma.exe

pid	process
3460	schtasks.exe
4448	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	3604	5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe
Token: SeDebugPrivilege	3260	Sigma.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exeSigma.exe

description	pid	process	target process
PID 3604 wrote to memory of 3460	3604	5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe	schtasks.exe
PID 3604 wrote to memory of 3460	3604	5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe	schtasks.exe
PID 3604 wrote to memory of 3260	3604	5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe	Sigma.exe
PID 3604 wrote to memory of 3260	3604	5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe	Sigma.exe
PID 3260 wrote to memory of 4448	3260	Sigma.exe	schtasks.exe
PID 3260 wrote to memory of 4448	3260	Sigma.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\5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe
"C:\Users\Admin\AppData\Local\Temp\5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3604

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Javaxxx" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Sigma.exe" /rl HIGHEST /f
2⤵
- Scheduled Task/Job: Scheduled Task
PID:3460

C:\Users\Admin\AppData\Roaming\SubDir\Sigma.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Sigma.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3260

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "Javaxxx" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Sigma.exe" /rl HIGHEST /f
3⤵
- Scheduled Task/Job: Scheduled Task
PID:4448

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads

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

MD5
4f107e95a9c20b41ef4e602ec661d3f1

SHA1
429db6828d2152b818f5db9f0574e867dcaf2f6b

SHA256
5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959

SHA512
b8bc51d250bd443347a52211b4bb1075c8a7b89d3e190d0efd093b3f74e7d2e2c041eaea62798484ab0a9d7da4a81c62f42172b6dacd190bd5a54de706b75f13

Download Submit
memory/3260-8-0x00007FF899AA0000-0x00007FF89A561000-memory.dmp

Filesize
10.8MB

Download
memory/3260-10-0x00007FF899AA0000-0x00007FF89A561000-memory.dmp

Filesize
10.8MB

Download
memory/3260-11-0x000000001B960000-0x000000001B9B0000-memory.dmp

Filesize
320KB

Download
memory/3260-12-0x000000001C0A0000-0x000000001C152000-memory.dmp

Filesize
712KB

Download
memory/3260-13-0x00007FF899AA0000-0x00007FF89A561000-memory.dmp

Filesize
10.8MB

Download
memory/3604-1-0x0000000000D00000-0x0000000001024000-memory.dmp

Filesize
3.1MB

Download
memory/3604-0-0x00007FF899AA3000-0x00007FF899AA5000-memory.dmp

Filesize
8KB

Download
memory/3604-2-0x00007FF899AA0000-0x00007FF89A561000-memory.dmp

Filesize
10.8MB

Download
memory/3604-9-0x00007FF899AA0000-0x00007FF89A561000-memory.dmp

Filesize
10.8MB

Download