quasar | db857bc6602026ddfd794ec8c167ede510ca24d46d1de71fac1357c1f4f34bfb

General

Target

Client-built.exe
Size

3.1MB
MD5

403d20c63335b299c8bcbe4c6e49231e
SHA1

b581c2ca151a033dd10dca736ea76cf29278f498
SHA256

db857bc6602026ddfd794ec8c167ede510ca24d46d1de71fac1357c1f4f34bfb
SHA512

68418311a5e6cf5a81205513cb2beefc164a913c8f361c7405698948977f77ef4e682aeef651844f9e2da1b6fba978d6f5b97f9fe0780d6b0b91d34a0ea6570a
SSDEEP

49152:rvrhBYjCO4Dt2d5aKCuVPzlEmVQL0wvwkadReEErHgk/uVkoGduLTHHB72eh2NT:rvjt2d5aKCuVPzlEmVQ0wvwfdRe6C+

Score

10^/10

quasar office04 spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

gorodpro-37914.portmap.host:37914

Mutex

1c5ec883-e96d-4a3a-9035-7a940d47aeb7

Attributes

encryption_key
99E87F88E9E967A51725453CB8223ADDB8256DE2
install_name
WindowsDefender.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Defender
subdirectory
WindowsDefender

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/772-1-0x0000000000770000-0x0000000000A94000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\WindowsDefender\WindowsDefender.exe	family_quasar

Executes dropped EXE 1 IoCs

Processes:

WindowsDefender.exe

pid process

3644 WindowsDefender.exe
Reads WinSCP keys stored on the system 2 TTPs
Tries to access WinSCP stored sessions.
spyware stealer

Data from Local System
T1005

Credentials in Registry
T1552.002
Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003
Opens file in notepad (likely ransom note) 1 IoCs
ransomware

Processes:

NOTEPAD.EXE

pid process

380 NOTEPAD.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

2292 schtasks.exe
4556 schtasks.exe
Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

WindowsDefender.exe

pid process

3644 WindowsDefender.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Client-built.exeWindowsDefender.exe

description pid process

Token: SeDebugPrivilege 772 Client-built.exe
Token: SeDebugPrivilege 3644 WindowsDefender.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

WindowsDefender.exe

pid process

3644 WindowsDefender.exe

pid	process
3644	WindowsDefender.exe

pid	process
380	NOTEPAD.EXE

pid	process
2292	schtasks.exe
4556	schtasks.exe

pid	process
3644	WindowsDefender.exe

description	pid	process
Token: SeDebugPrivilege	772	Client-built.exe
Token: SeDebugPrivilege	3644	WindowsDefender.exe

pid	process
3644	WindowsDefender.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

Client-built.exeWindowsDefender.execmd.exe

description	pid	process	target process
PID 772 wrote to memory of 2292	772	Client-built.exe	schtasks.exe
PID 772 wrote to memory of 2292	772	Client-built.exe	schtasks.exe
PID 772 wrote to memory of 3644	772	Client-built.exe	WindowsDefender.exe
PID 772 wrote to memory of 3644	772	Client-built.exe	WindowsDefender.exe
PID 3644 wrote to memory of 4556	3644	WindowsDefender.exe	schtasks.exe
PID 3644 wrote to memory of 4556	3644	WindowsDefender.exe	schtasks.exe
PID 3644 wrote to memory of 3484	3644	WindowsDefender.exe	cmd.exe
PID 3644 wrote to memory of 3484	3644	WindowsDefender.exe	cmd.exe
PID 3484 wrote to memory of 3200	3484	cmd.exe	chcp.com
PID 3484 wrote to memory of 3200	3484	cmd.exe	chcp.com

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:772
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\WindowsDefender\WindowsDefender.exe" /rl HIGHEST /f
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:2292
- C:\Users\Admin\AppData\Roaming\WindowsDefender\WindowsDefender.exe
  "C:\Users\Admin\AppData\Roaming\WindowsDefender\WindowsDefender.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3644
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\WindowsDefender\WindowsDefender.exe" /rl HIGHEST /f
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4556
- - C:\Windows\SYSTEM32\cmd.exe
    "cmd" /K CHCP 437
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3484
  - - C:\Windows\system32\chcp.com
      CHCP 437
      4⤵
      PID:3200

C:\Windows\system32\NOTEPAD.EXE
"C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\Desktop\xd.txt
1⤵
- Opens file in notepad (likely ransom note)
PID:380

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

Credentials from Password Stores

1

T1555

Credentials from Web Browsers

1

T1555.003

Unsecured Credentials

2

T1552

Credentials In Files

1

T1552.001

Credentials in Registry

1

T1552.002

Discovery

Query Registry

1

T1012

Lateral Movement

Collection

Data from Local System

2

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\WindowsDefender\WindowsDefender.exe

Filesize
3.1MB

MD5
403d20c63335b299c8bcbe4c6e49231e

SHA1
b581c2ca151a033dd10dca736ea76cf29278f498

SHA256
db857bc6602026ddfd794ec8c167ede510ca24d46d1de71fac1357c1f4f34bfb

SHA512
68418311a5e6cf5a81205513cb2beefc164a913c8f361c7405698948977f77ef4e682aeef651844f9e2da1b6fba978d6f5b97f9fe0780d6b0b91d34a0ea6570a

Download Submit
memory/772-0-0x00007FFBE7BE3000-0x00007FFBE7BE5000-memory.dmp

Filesize
8KB

Download
memory/772-1-0x0000000000770000-0x0000000000A94000-memory.dmp

Filesize
3.1MB

Download
memory/772-2-0x00007FFBE7BE0000-0x00007FFBE86A2000-memory.dmp

Filesize
10.8MB

Download
memory/772-5-0x00007FFBE7BE0000-0x00007FFBE86A2000-memory.dmp

Filesize
10.8MB

Download
memory/3644-7-0x00007FFBE7BE0000-0x00007FFBE86A2000-memory.dmp

Filesize
10.8MB

Download
memory/3644-6-0x00007FFBE7BE0000-0x00007FFBE86A2000-memory.dmp

Filesize
10.8MB

Download
memory/3644-8-0x0000000002CB0000-0x0000000002D00000-memory.dmp

Filesize
320KB

Download
memory/3644-9-0x000000001C840000-0x000000001C8F2000-memory.dmp

Filesize
712KB

Download
memory/3644-10-0x00007FFBE7BE0000-0x00007FFBE86A2000-memory.dmp

Filesize
10.8MB

Download
memory/3644-11-0x00007FFBE7BE0000-0x00007FFBE86A2000-memory.dmp

Filesize
10.8MB

Download
memory/3644-14-0x000000001C780000-0x000000001C792000-memory.dmp

Filesize
72KB

Download
memory/3644-15-0x000000001C7E0000-0x000000001C81C000-memory.dmp

Filesize
240KB

Download
memory/3644-16-0x000000001D140000-0x000000001D23F000-memory.dmp

Filesize
1020KB

Download
memory/3644-33-0x000000001EA10000-0x000000001EF38000-memory.dmp

Filesize
5.2MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads