quasar | 3b3900adf2232fb5a995c9f6884feededfbe4a862a076ac3af936e4b5a858887

Analysis

max time kernel
139s
max time network
144s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
02/11/2024, 11:42

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General

Target

Client-built.exe
Size

3.1MB
MD5

96dbf079644fad007ddee4a898bdb096
SHA1

3eec62ed768ce4a1181f00a0dd6cca3564e1f9f1
SHA256

3b3900adf2232fb5a995c9f6884feededfbe4a862a076ac3af936e4b5a858887
SHA512

356a13c7ab5bb02ee79a2ff9525f0f8ca832302fba37cf140af8264d31933a00745b59d7f742a42ef0576964f6e112580430996ac068f63c4112907c69471385
SSDEEP

49152:KvDI22SsaNYfdPBldt698dBcjHEpSu1J/goGdXTHHB72eh2NT:Kv822SsaNYfdPBldt6+dBcjHEpSJ

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

192.168.0.102:4782

Mutex

a84f48f3-00c9-414a-a093-49d616e432d3

Attributes

encryption_key
D440572F816847D4B5AD6EAA65627B5DFFF00151
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 family
quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral1/memory/988-1-0x0000000000A80000-0x0000000000DA4000-memory.dmp	family_quasar
behavioral1/files/0x0007000000023c71-6.dat	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
428	Client.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

pid	Process
2032	schtasks.exe
2244	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	988	Client-built.exe
Token: SeDebugPrivilege	428	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
428	Client.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 988 wrote to memory of 2032	988	Client-built.exe	90
PID 988 wrote to memory of 2032	988	Client-built.exe	90
PID 988 wrote to memory of 428	988	Client-built.exe	92
PID 988 wrote to memory of 428	988	Client-built.exe	92
PID 428 wrote to memory of 2244	428	Client.exe	93
PID 428 wrote to memory of 2244	428	Client.exe	93

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:988
- 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⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2032
- 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:428
- - 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⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2244

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:3420

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

Query Registry

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
3.1MB

MD5
96dbf079644fad007ddee4a898bdb096

SHA1
3eec62ed768ce4a1181f00a0dd6cca3564e1f9f1

SHA256
3b3900adf2232fb5a995c9f6884feededfbe4a862a076ac3af936e4b5a858887

SHA512
356a13c7ab5bb02ee79a2ff9525f0f8ca832302fba37cf140af8264d31933a00745b59d7f742a42ef0576964f6e112580430996ac068f63c4112907c69471385

Download Submit
memory/428-10-0x00007FFCC7300000-0x00007FFCC7DC1000-memory.dmp

Filesize
10.8MB

Download
memory/428-11-0x00007FFCC7300000-0x00007FFCC7DC1000-memory.dmp

Filesize
10.8MB

Download
memory/428-12-0x000000001C190000-0x000000001C1E0000-memory.dmp

Filesize
320KB

Download
memory/428-13-0x000000001C2A0000-0x000000001C352000-memory.dmp

Filesize
712KB

Download
memory/428-14-0x00007FFCC7300000-0x00007FFCC7DC1000-memory.dmp

Filesize
10.8MB

Download
memory/428-15-0x000000001CBD0000-0x000000001D0F8000-memory.dmp

Filesize
5.2MB

Download
memory/988-0-0x00007FFCC7303000-0x00007FFCC7305000-memory.dmp

Filesize
8KB

Download
memory/988-1-0x0000000000A80000-0x0000000000DA4000-memory.dmp

Filesize
3.1MB

Download
memory/988-2-0x00007FFCC7300000-0x00007FFCC7DC1000-memory.dmp

Filesize
10.8MB

Download
memory/988-9-0x00007FFCC7300000-0x00007FFCC7DC1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads