quasar | 2848ac271c559c6fae6e1ed2ab87b6c78b1eea35945c6f0457872804077ce3a4

General

Target

antivairus.exe
Size

3.1MB
MD5

2477f49a356c0698fc601aef9ed64d08
SHA1

56eb441feffcac5f7a8889f16c8cbc9255d25979
SHA256

2848ac271c559c6fae6e1ed2ab87b6c78b1eea35945c6f0457872804077ce3a4
SHA512

6f091994efffb7a0b2ac90ce61c5050da2be48abd33060b3461539ecfedee72a691142899c3f2b9fe4678f0ae2c7b1b16aeb1b91932b3c0a785b0625105659a8
SSDEEP

49152:SvyI22SsaNYfdPBldt698dBcjH7sRJ6BbR3LoGdXTHHB72eh2NT:Svf22SsaNYfdPBldt6+dBcjH7sRJ6j

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

190.104.116.8:4782

Mutex

e51e2b65-e963-4051-9736-67d57ed46798

Attributes

encryption_key
AEA258EF65BF1786F0F767C0BE2497ECC304C46F
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 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1660-1-0x00000000012D0000-0x00000000015F4000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
behavioral1/memory/2656-9-0x00000000001F0000-0x0000000000514000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

2656 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

Processes:

schtasks.exeschtasks.exe

pid process

2520 schtasks.exe
2528 schtasks.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

antivairus.exeClient.exe

description pid process

Token: SeDebugPrivilege 1660 antivairus.exe
Token: SeDebugPrivilege 2656 Client.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

2656 Client.exe

pid	process
2656	Client.exe

pid	process
2520	schtasks.exe
2528	schtasks.exe

description	pid	process
Token: SeDebugPrivilege	1660	antivairus.exe
Token: SeDebugPrivilege	2656	Client.exe

pid	process
2656	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

antivairus.exeClient.exe

description	pid	process	target process
PID 1660 wrote to memory of 2520	1660	antivairus.exe	schtasks.exe
PID 1660 wrote to memory of 2520	1660	antivairus.exe	schtasks.exe
PID 1660 wrote to memory of 2520	1660	antivairus.exe	schtasks.exe
PID 1660 wrote to memory of 2656	1660	antivairus.exe	Client.exe
PID 1660 wrote to memory of 2656	1660	antivairus.exe	Client.exe
PID 1660 wrote to memory of 2656	1660	antivairus.exe	Client.exe
PID 2656 wrote to memory of 2528	2656	Client.exe	schtasks.exe
PID 2656 wrote to memory of 2528	2656	Client.exe	schtasks.exe
PID 2656 wrote to memory of 2528	2656	Client.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\antivairus.exe
"C:\Users\Admin\AppData\Local\Temp\antivairus.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1660
- 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:2520
- 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:2656
- - 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:2528

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

Replay Monitor

Loading Replay Monitor...

Downloads

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

Filesize
3.1MB

MD5
2477f49a356c0698fc601aef9ed64d08

SHA1
56eb441feffcac5f7a8889f16c8cbc9255d25979

SHA256
2848ac271c559c6fae6e1ed2ab87b6c78b1eea35945c6f0457872804077ce3a4

SHA512
6f091994efffb7a0b2ac90ce61c5050da2be48abd33060b3461539ecfedee72a691142899c3f2b9fe4678f0ae2c7b1b16aeb1b91932b3c0a785b0625105659a8

Download Submit
memory/1660-0-0x000007FEF5D53000-0x000007FEF5D54000-memory.dmp

Filesize
4KB

Download
memory/1660-1-0x00000000012D0000-0x00000000015F4000-memory.dmp

Filesize
3.1MB

Download
memory/1660-2-0x000007FEF5D50000-0x000007FEF673C000-memory.dmp

Filesize
9.9MB

Download
memory/1660-8-0x000007FEF5D50000-0x000007FEF673C000-memory.dmp

Filesize
9.9MB

Download
memory/2656-10-0x000007FEF5D50000-0x000007FEF673C000-memory.dmp

Filesize
9.9MB

Download
memory/2656-9-0x00000000001F0000-0x0000000000514000-memory.dmp

Filesize
3.1MB

Download
memory/2656-11-0x000007FEF5D50000-0x000007FEF673C000-memory.dmp

Filesize
9.9MB

Download
memory/2656-12-0x000007FEF5D50000-0x000007FEF673C000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads