quasar | 05179b9dfbc17195f29cf193a16449c9236a1539f53d57d56f12146c491255f4

Analysis

max time kernel
146s
max time network
147s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
09-02-2025 23:37

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General

Target

test.exe
Size

348KB
MD5

2f671e7ebc050b4f024988ef32316937
SHA1

73a69d7d9ed1c8a63d626edf59702b470d2d6650
SHA256

25f2d280e685bf93f437553620a4b4e89d362205af34c22263bcd6bb33386fe3
SHA512

86f0a286e39040a86504c306f9587e840d8ea74bfaaaee5105f0689434b4e433ab5c30032077a8e3e7eae697a65ebae3a09001434a31f9ac5863c323d2d7d7be
SSDEEP

3072:hjrN+Jhi1vwWdCqLlpyDcsvPBsPJ+bgCr8a8JLEThlbVBD5JVWt8nwU69r4rUYT1:hHUhIvTCqLyR0LtUbPdv69r4rUYTMm

Score

10^/10

quasar office04 discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

Office04

127.0.0.1:4782

Mutex

QSR_MUTEX_n0f6at7YDD5llBKKrq

Attributes

encryption_key
WTfCCpEEZrrjQU0Hwnaj
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
csrss.exe
subdirectory
SubDir

Signatures

Quasar RAT 3 IoCs

Quasar is an open source Remote Access Tool.

trojan spyware quasar

description	flow	ioc	Process
	2	ip-api.com	Process not Found
Key opened		\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	test.exe
	6	api.ipify.org	Process not Found

Quasar family
quasar

Quasar payload 1 IoCs

resource	yara_rule
behavioral1/memory/1812-1-0x00000000010F0000-0x000000000114E000-memory.dmp	family_quasar

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
2	ip-api.com
6	api.ipify.org

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	test.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2192	schtasks.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1812	test.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 1812 wrote to memory of 2192	1812	test.exe	32
PID 1812 wrote to memory of 2192	1812	test.exe	32
PID 1812 wrote to memory of 2192	1812	test.exe	32
PID 1812 wrote to memory of 2192	1812	test.exe	32

C:\Users\Admin\AppData\Local\Temp\test.exe
"C:\Users\Admin\AppData\Local\Temp\test.exe"
1⤵
- Quasar RAT
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1812
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "csrss.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\test.exe" /rl HIGHEST /f
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:2192

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/1812-0-0x00000000744EE000-0x00000000744EF000-memory.dmp

Filesize
4KB

Download
memory/1812-1-0x00000000010F0000-0x000000000114E000-memory.dmp

Filesize
376KB

Download
memory/1812-2-0x00000000744E0000-0x0000000074BCE000-memory.dmp

Filesize
6.9MB

Download
memory/1812-3-0x00000000744EE000-0x00000000744EF000-memory.dmp

Filesize
4KB

Download
memory/1812-4-0x00000000744E0000-0x0000000074BCE000-memory.dmp

Filesize
6.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads