quasar | 5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959

Analysis

max time kernel
150s
max time network
135s
platform
windows7_x64
resource
win7-20231129-en
resource tags

arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
submitted
30-06-2024 21:50

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

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 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1716-1-0x00000000001E0000-0x0000000000504000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Sigma.exe	family_quasar
behavioral1/memory/2056-8-0x0000000001110000-0x0000000001434000-memory.dmp	family_quasar

Detects Windows executables referencing non-Windows User-Agents 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1716-1-0x00000000001E0000-0x0000000000504000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
C:\Users\Admin\AppData\Roaming\SubDir\Sigma.exe	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral1/memory/2056-8-0x0000000001110000-0x0000000001434000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1716-1-0x00000000001E0000-0x0000000000504000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers
C:\Users\Admin\AppData\Roaming\SubDir\Sigma.exe	INDICATOR_SUSPICIOUS_Binary_References_Browsers
behavioral1/memory/2056-8-0x0000000001110000-0x0000000001434000-memory.dmp	INDICATOR_SUSPICIOUS_Binary_References_Browsers

Detects executables containing common artifacts observed in infostealers 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1716-1-0x00000000001E0000-0x0000000000504000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer
C:\Users\Admin\AppData\Roaming\SubDir\Sigma.exe	INDICATOR_SUSPICIOUS_GENInfoStealer
behavioral1/memory/2056-8-0x0000000001110000-0x0000000001434000-memory.dmp	INDICATOR_SUSPICIOUS_GENInfoStealer

Executes dropped EXE 1 IoCs

Processes:

Sigma.exe

pid process

2056 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

2976 schtasks.exe
2676 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exeSigma.exe

description pid process

Token: SeDebugPrivilege 1716 5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe
Token: SeDebugPrivilege 2056 Sigma.exe

pid	process
2056	Sigma.exe

pid	process
2976	schtasks.exe
2676	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	1716	5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe
Token: SeDebugPrivilege	2056	Sigma.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exeSigma.exe

description	pid	process	target process
PID 1716 wrote to memory of 2976	1716	5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe	schtasks.exe
PID 1716 wrote to memory of 2976	1716	5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe	schtasks.exe
PID 1716 wrote to memory of 2976	1716	5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe	schtasks.exe
PID 1716 wrote to memory of 2056	1716	5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe	Sigma.exe
PID 1716 wrote to memory of 2056	1716	5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe	Sigma.exe
PID 1716 wrote to memory of 2056	1716	5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959.exe	Sigma.exe
PID 2056 wrote to memory of 2676	2056	Sigma.exe	schtasks.exe
PID 2056 wrote to memory of 2676	2056	Sigma.exe	schtasks.exe
PID 2056 wrote to memory of 2676	2056	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:1716

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:2976

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:2056

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:2676

Network

MITRE ATT&CK Matrix ATT&CK v13

Replay Monitor

Loading Replay Monitor...

Downloads

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

MD5
4f107e95a9c20b41ef4e602ec661d3f1

SHA1
429db6828d2152b818f5db9f0574e867dcaf2f6b

SHA256
5a1c61fc913ba7293c85c7b4ad28e88f1683ec2158897eab5a5212d4059ab959

SHA512
b8bc51d250bd443347a52211b4bb1075c8a7b89d3e190d0efd093b3f74e7d2e2c041eaea62798484ab0a9d7da4a81c62f42172b6dacd190bd5a54de706b75f13

Download Submit
memory/1716-0-0x000007FEF5CE3000-0x000007FEF5CE4000-memory.dmp

Filesize
4KB

Download
memory/1716-1-0x00000000001E0000-0x0000000000504000-memory.dmp

Filesize
3.1MB

Download
memory/1716-2-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download
memory/1716-7-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download
memory/2056-8-0x0000000001110000-0x0000000001434000-memory.dmp

Filesize
3.1MB

Download
memory/2056-9-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download
memory/2056-10-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download
memory/2056-11-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

Filesize
9.9MB

Download