quasar | 5ed9d60854afed41799f5c6afe30d99e8b20bd14f22f189c5fea0f5f6d7c4835

General

Target

RustRCSController.exe
Size

3.1MB
MD5

be28df7fa7d56618aa9d68f128f1ad6e
SHA1

f7057f68a15d4bb16a4879ae5e86add4de34d130
SHA256

5ed9d60854afed41799f5c6afe30d99e8b20bd14f22f189c5fea0f5f6d7c4835
SHA512

1367c799c758c62b65dc75fc85fcdf1838aa9b52a480dc60bd27fdad468ccd2890e60e4f7966a8f263e6173fe9e3493ec01387525b1acfc0730ce1cb84e156d6
SSDEEP

49152:uvzlL26AaNeWgPhlmVqvMQ7XSKEVRJ66bR3LoGdzTHHB72eh2NT:uvpL26AaNeWgPhlmVqkQ7XSKEVRJ6U

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.254.105:4782

Mutex

5fa0d5e3-3b6f-43a3-aa67-c57d1de249e7

Attributes

encryption_key
148D381E3CBDDC36FD069774D97038E889166888
install_name
RustRCSController.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

Processes:

resource	yara_rule
behavioral1/memory/496-1-0x00000000001E0000-0x0000000000504000-memory.dmp	family_quasar
behavioral1/files/0x001d00000002ab31-6.dat	family_quasar

Executes dropped EXE 1 IoCs

Processes:

RustRCSController.exe

pid	Process
4296	RustRCSController.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
2340	schtasks.exe
4672	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

RustRCSController.exeRustRCSController.exe

description	pid	Process
Token: SeDebugPrivilege	496	RustRCSController.exe
Token: SeDebugPrivilege	4296	RustRCSController.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

RustRCSController.exe

pid	Process
4296	RustRCSController.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

RustRCSController.exeRustRCSController.exe

description	pid	Process	procid_target
PID 496 wrote to memory of 2340	496	RustRCSController.exe	81
PID 496 wrote to memory of 2340	496	RustRCSController.exe	81
PID 496 wrote to memory of 4296	496	RustRCSController.exe	83
PID 496 wrote to memory of 4296	496	RustRCSController.exe	83
PID 4296 wrote to memory of 4672	4296	RustRCSController.exe	84
PID 4296 wrote to memory of 4672	4296	RustRCSController.exe	84

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\RustRCSController.exe
"C:\Users\Admin\AppData\Local\Temp\RustRCSController.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:496
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\RustRCSController.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2340
- C:\Users\Admin\AppData\Roaming\SubDir\RustRCSController.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\RustRCSController.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4296
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\RustRCSController.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4672

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:3468

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\RustRCSController.exe.log

Filesize
1KB

MD5
b4e91d2e5f40d5e2586a86cf3bb4df24

SHA1
31920b3a41aa4400d4a0230a7622848789b38672

SHA256
5d8af3c7519874ed42a0d74ee559ae30d9cc6930aef213079347e2b47092c210

SHA512
968751b79a98961f145de48d425ea820fd1875bae79a725adf35fc8f4706c103ee0c7babd4838166d8a0dda9fbce3728c0265a04c4b37f335ec4eaa110a2b319

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\RustRCSController.exe

Filesize
3.1MB

MD5
be28df7fa7d56618aa9d68f128f1ad6e

SHA1
f7057f68a15d4bb16a4879ae5e86add4de34d130

SHA256
5ed9d60854afed41799f5c6afe30d99e8b20bd14f22f189c5fea0f5f6d7c4835

SHA512
1367c799c758c62b65dc75fc85fcdf1838aa9b52a480dc60bd27fdad468ccd2890e60e4f7966a8f263e6173fe9e3493ec01387525b1acfc0730ce1cb84e156d6

Download Submit
memory/496-0-0x00007FF8EB363000-0x00007FF8EB365000-memory.dmp

Filesize
8KB

Download
memory/496-1-0x00000000001E0000-0x0000000000504000-memory.dmp

Filesize
3.1MB

Download
memory/496-2-0x00007FF8EB360000-0x00007FF8EBE22000-memory.dmp

Filesize
10.8MB

Download
memory/496-11-0x00007FF8EB360000-0x00007FF8EBE22000-memory.dmp

Filesize
10.8MB

Download
memory/4296-10-0x00007FF8EB360000-0x00007FF8EBE22000-memory.dmp

Filesize
10.8MB

Download
memory/4296-12-0x00007FF8EB360000-0x00007FF8EBE22000-memory.dmp

Filesize
10.8MB

Download
memory/4296-13-0x000000001C0E0000-0x000000001C130000-memory.dmp

Filesize
320KB

Download
memory/4296-14-0x000000001C1F0000-0x000000001C2A2000-memory.dmp

Filesize
712KB

Download
memory/4296-15-0x00007FF8EB360000-0x00007FF8EBE22000-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