quasar | 4b1dfcbfe76d3b2778598bf41e3873665d0bdfae115735ca1332bed8aa50e2df

General

Target

Client-built.exe
Size

3.1MB
MD5

adc809b75572fa46fda9f842728dd9fb
SHA1

8bfb4918f551b2f04551504b6047539d673e30f6
SHA256

4b1dfcbfe76d3b2778598bf41e3873665d0bdfae115735ca1332bed8aa50e2df
SHA512

2041fa4fbd8948f05658a205d4a2a702cf6865f6982e08f37c0fd2f4d207c69199699678cf4fce18dc6fa25f41269720a00f8fbd5e0d00456b849d644246a465
SSDEEP

49152:avAt62XlaSFNWPjljiFa2RoUYIEgRJ63bR3LoGd+THHB72eh2NT:avs62XlaSFNWPjljiFXRoUYIEgRJ6J

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.31.68:4782

Mutex

05ee7805-26a7-4761-b21c-d55dcaa31857

Attributes

encryption_key
B444CC22137E58A588D9597C46888B34DA3BD016
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Client
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 3 IoCs

resource	yara_rule
behavioral1/memory/2440-1-0x0000000000ED0000-0x00000000011F4000-memory.dmp	family_quasar
behavioral1/files/0x0009000000016d0b-6.dat	family_quasar
behavioral1/memory/316-9-0x0000000000D20000-0x0000000001044000-memory.dmp	family_quasar

Executes dropped EXE 1 IoCs

pid	Process
316	Client.exe

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Program Files\SubDir\Client.exe	Client.exe
File opened for modification	C:\Program Files\SubDir	Client.exe
File created	C:\Program Files\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Program Files\SubDir\Client.exe	Client-built.exe
File opened for modification	C:\Program Files\SubDir	Client-built.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
2108	schtasks.exe
2056	schtasks.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2440	Client-built.exe
Token: SeDebugPrivilege	316	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
316	Client.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2440 wrote to memory of 2108	2440	Client-built.exe	28
PID 2440 wrote to memory of 2108	2440	Client-built.exe	28
PID 2440 wrote to memory of 2108	2440	Client-built.exe	28
PID 2440 wrote to memory of 316	2440	Client-built.exe	30
PID 2440 wrote to memory of 316	2440	Client-built.exe	30
PID 2440 wrote to memory of 316	2440	Client-built.exe	30
PID 316 wrote to memory of 2056	316	Client.exe	31
PID 316 wrote to memory of 2056	316	Client.exe	31
PID 316 wrote to memory of 2056	316	Client.exe	31

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⤵
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2440
- C:\Windows\system32\schtasks.exe
  "schtasks" /create /tn "Client" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2108
- C:\Program Files\SubDir\Client.exe
  "C:\Program Files\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in Program Files directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:316
- - C:\Windows\system32\schtasks.exe
    "schtasks" /create /tn "Client" /sc ONLOGON /tr "C:\Program Files\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2056

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:\Program Files\SubDir\Client.exe

Filesize
3.1MB

MD5
adc809b75572fa46fda9f842728dd9fb

SHA1
8bfb4918f551b2f04551504b6047539d673e30f6

SHA256
4b1dfcbfe76d3b2778598bf41e3873665d0bdfae115735ca1332bed8aa50e2df

SHA512
2041fa4fbd8948f05658a205d4a2a702cf6865f6982e08f37c0fd2f4d207c69199699678cf4fce18dc6fa25f41269720a00f8fbd5e0d00456b849d644246a465

Download Submit
memory/316-9-0x0000000000D20000-0x0000000001044000-memory.dmp

Filesize
3.1MB

Download
memory/316-11-0x000007FEF5CF0000-0x000007FEF66DC000-memory.dmp

Filesize
9.9MB

Download
memory/316-10-0x000007FEF5CF0000-0x000007FEF66DC000-memory.dmp

Filesize
9.9MB

Download
memory/316-12-0x000007FEF5CF0000-0x000007FEF66DC000-memory.dmp

Filesize
9.9MB

Download
memory/2440-0-0x000007FEF5CF3000-0x000007FEF5CF4000-memory.dmp

Filesize
4KB

Download
memory/2440-1-0x0000000000ED0000-0x00000000011F4000-memory.dmp

Filesize
3.1MB

Download
memory/2440-2-0x000007FEF5CF0000-0x000007FEF66DC000-memory.dmp

Filesize
9.9MB

Download
memory/2440-8-0x000007FEF5CF0000-0x000007FEF66DC000-memory.dmp

Filesize
9.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads