quasar | b63d3105f4cc32fd098e2e780226965dac57cfb59be41705d14c4999413b39dd

Analysis

max time kernel
92s
max time network
141s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
09-12-2024 11:01

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General

Target

TransferenciaInterbancaria.xlsx.exe
Size

875KB
MD5

45ceeacf3abe7ed79b516d9f8a2a38da
SHA1

9dde49444c02e49ef15a885214a16dae2727ef1e
SHA256

b63d3105f4cc32fd098e2e780226965dac57cfb59be41705d14c4999413b39dd
SHA512

8c3128828df7d0ed0594f4273a2d8d66e66f43d4fe68fbef3ebc1e711324de7a7ce0db0c5c21fa1c8390a5ebb1d53ce9ff3f60bb57af31d7048c236a30d1b978
SSDEEP

12288:rDFW+bJWI5jPjdTYoeT2NecNhoU1JWE2rFoMuMK:FW+bJWIvLNemaU1/M

Score

10^/10

quasar mx discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

ert43w221.ydns.eu:6298

Mutex

7a41955f-eb2f-4ca4-8f9f-5e9bfadf0810

Attributes

encryption_key
799E5C34BA6EC18D72E269D0C5CF1A5AC1AD9277
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
svchost
subdirectory
SubDir

Signatures

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/3040-1199-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar

Suspicious use of NtCreateUserProcessOtherParentProcess 1 IoCs

description	pid	Process	procid_target
PID 4528 created 3556	4528	TransferenciaInterbancaria.xlsx.exe	56

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\WrappedObject.vbs	TransferenciaInterbancaria.xlsx.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4528 set thread context of 3040	4528	TransferenciaInterbancaria.xlsx.exe	85

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	TransferenciaInterbancaria.xlsx.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	InstallUtil.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
4624	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
4528	TransferenciaInterbancaria.xlsx.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4528	TransferenciaInterbancaria.xlsx.exe
Token: SeDebugPrivilege	4528	TransferenciaInterbancaria.xlsx.exe
Token: SeDebugPrivilege	3040	InstallUtil.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 4528 wrote to memory of 3040	4528	TransferenciaInterbancaria.xlsx.exe	85
PID 4528 wrote to memory of 3040	4528	TransferenciaInterbancaria.xlsx.exe	85
PID 4528 wrote to memory of 3040	4528	TransferenciaInterbancaria.xlsx.exe	85
PID 4528 wrote to memory of 3040	4528	TransferenciaInterbancaria.xlsx.exe	85
PID 4528 wrote to memory of 3040	4528	TransferenciaInterbancaria.xlsx.exe	85
PID 4528 wrote to memory of 3040	4528	TransferenciaInterbancaria.xlsx.exe	85
PID 4528 wrote to memory of 3040	4528	TransferenciaInterbancaria.xlsx.exe	85
PID 4528 wrote to memory of 3040	4528	TransferenciaInterbancaria.xlsx.exe	85
PID 3040 wrote to memory of 4624	3040	InstallUtil.exe	89
PID 3040 wrote to memory of 4624	3040	InstallUtil.exe	89
PID 3040 wrote to memory of 4624	3040	InstallUtil.exe	89

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
PID:3556
- C:\Users\Admin\AppData\Local\Temp\TransferenciaInterbancaria.xlsx.exe
  "C:\Users\Admin\AppData\Local\Temp\TransferenciaInterbancaria.xlsx.exe"
  2⤵
  - Suspicious use of NtCreateUserProcessOtherParentProcess
  - Drops startup file
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4528
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3040
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "svchost" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4624

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

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/3040-1198-0x0000000075040000-0x00000000757F0000-memory.dmp

Filesize
7.7MB

Download
memory/3040-1199-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/3040-1200-0x0000000075040000-0x00000000757F0000-memory.dmp

Filesize
7.7MB

Download
memory/3040-1201-0x0000000005760000-0x000000000576A000-memory.dmp

Filesize
40KB

Download
memory/3040-1202-0x0000000006A40000-0x0000000007058000-memory.dmp

Filesize
6.1MB

Download
memory/3040-1210-0x0000000075040000-0x00000000757F0000-memory.dmp

Filesize
7.7MB

Download
memory/3040-1209-0x0000000007A50000-0x0000000007AB6000-memory.dmp

Filesize
408KB

Download
memory/3040-1208-0x00000000079A0000-0x00000000079DC000-memory.dmp

Filesize
240KB

Download
memory/3040-1207-0x0000000007940000-0x0000000007952000-memory.dmp

Filesize
72KB

Download
memory/3040-1204-0x0000000006780000-0x0000000006832000-memory.dmp

Filesize
712KB

Download
memory/3040-1203-0x0000000006510000-0x0000000006560000-memory.dmp

Filesize
320KB

Download
memory/4528-33-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-65-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-53-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-63-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-61-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-59-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-57-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-55-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-51-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-49-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-45-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-44-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-39-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-37-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-47-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-41-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-35-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-11-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-31-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-29-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-27-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-69-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-67-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-15-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-23-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-21-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-19-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-17-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-13-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-9-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-7-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-25-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-6-0x0000000006370000-0x0000000006578000-memory.dmp

Filesize
2.0MB

Download
memory/4528-1182-0x0000000075040000-0x00000000757F0000-memory.dmp

Filesize
7.7MB

Download
memory/4528-1183-0x0000000006AC0000-0x0000000006C3E000-memory.dmp

Filesize
1.5MB

Download
memory/4528-1184-0x0000000006900000-0x000000000694C000-memory.dmp

Filesize
304KB

Download
memory/4528-1185-0x0000000006950000-0x00000000069A4000-memory.dmp

Filesize
336KB

Download
memory/4528-5-0x00000000067F0000-0x0000000006882000-memory.dmp

Filesize
584KB

Download
memory/4528-4-0x0000000006CA0000-0x0000000007244000-memory.dmp

Filesize
5.6MB

Download
memory/4528-3-0x0000000006370000-0x000000000657E000-memory.dmp

Filesize
2.1MB

Download
memory/4528-2-0x0000000075040000-0x00000000757F0000-memory.dmp

Filesize
7.7MB

Download
memory/4528-1-0x0000000000610000-0x00000000006F2000-memory.dmp

Filesize
904KB

Download
memory/4528-0-0x000000007504E000-0x000000007504F000-memory.dmp

Filesize
4KB

Download
memory/4528-1191-0x0000000075040000-0x00000000757F0000-memory.dmp

Filesize
7.7MB

Download
memory/4528-1193-0x0000000075040000-0x00000000757F0000-memory.dmp

Filesize
7.7MB

Download
memory/4528-1195-0x0000000075040000-0x00000000757F0000-memory.dmp

Filesize
7.7MB

Download
memory/4528-1194-0x0000000075040000-0x00000000757F0000-memory.dmp

Filesize
7.7MB

Download
memory/4528-1197-0x0000000075040000-0x00000000757F0000-memory.dmp

Filesize
7.7MB

Download