quasar | 7300535ef26158bdb916366b717390fc36eb570473ed7805c18b101367c68af5

Analysis

max time kernel
35s
max time network
16s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
21-01-2025 07:50

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General

Target

20250121-004Especificacinrequerida.pdf62KB.com.exe
Size

3.7MB
MD5

570c14adf8743c7db308309f24e2955a
SHA1

217b4e17f050d5ea71dd981bb832df4f1a472442
SHA256

7300535ef26158bdb916366b717390fc36eb570473ed7805c18b101367c68af5
SHA512

1107773a533e0d8df7db216ad5a2eddb84463ccdf30adf67e7df5fc9d7681a2c9eafbaf5a62db4eef7e57cb120b64260e96030d9cb7fbd585750a43337e62fd0
SSDEEP

98304:efD1osXo7ZuEziszaWStvyaNkKk52ypcW:efchziszcvya852M

Score

10^/10

quasar es code discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

ES CODE

twart.myfirewall.org:9792

rency.ydns.eu:5287

wqo9.firewall-gateway.de:8841

code1.ydns.eu:5287

wqo9.firewall-gateway.de:9792

Mutex

025351e291-5d1041-4fa37-932c7-8L69aeiQec514992

Attributes

encryption_key
3145298725BA5E0DD56E87FFE3F8898EA81E6EDA
install_name
Excelworkbook.exe
log_directory
Logs
reconnect_delay
6000
startup_key
pdfdocument
subdirectory
SubDir

Signatures

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

Quasar payload 5 IoCs

resource	yara_rule
behavioral1/memory/2732-15-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar
behavioral1/memory/2732-18-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar
behavioral1/memory/2732-13-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar
behavioral1/memory/2732-10-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar
behavioral1/memory/2732-9-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar

Executes dropped EXE 6 IoCs

pid	Process
2084	Excelworkbook.exe
1792	Excelworkbook.exe
1128	Excelworkbook.exe
2908	Excelworkbook.exe
1032	Excelworkbook.exe
2096	Excelworkbook.exe

Loads dropped DLL 2 IoCs

pid	Process
2732	20250121-004Especificacinrequerida.pdf62KB.com.exe
2732	20250121-004Especificacinrequerida.pdf62KB.com.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 908 set thread context of 2732	908	20250121-004Especificacinrequerida.pdf62KB.com.exe	29

System Location Discovery: System Language Discovery 1 TTPs 4 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	20250121-004Especificacinrequerida.pdf62KB.com.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	20250121-004Especificacinrequerida.pdf62KB.com.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Excelworkbook.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
2832	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
2084	Excelworkbook.exe
2084	Excelworkbook.exe
2084	Excelworkbook.exe
2084	Excelworkbook.exe
2084	Excelworkbook.exe
2084	Excelworkbook.exe
2084	Excelworkbook.exe
2084	Excelworkbook.exe
2084	Excelworkbook.exe
2084	Excelworkbook.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2732	20250121-004Especificacinrequerida.pdf62KB.com.exe
Token: SeDebugPrivilege	2084	Excelworkbook.exe

Suspicious use of WriteProcessMemory 37 IoCs

description	pid	Process	procid_target
PID 908 wrote to memory of 2732	908	20250121-004Especificacinrequerida.pdf62KB.com.exe	29
PID 908 wrote to memory of 2732	908	20250121-004Especificacinrequerida.pdf62KB.com.exe	29
PID 908 wrote to memory of 2732	908	20250121-004Especificacinrequerida.pdf62KB.com.exe	29
PID 908 wrote to memory of 2732	908	20250121-004Especificacinrequerida.pdf62KB.com.exe	29
PID 908 wrote to memory of 2732	908	20250121-004Especificacinrequerida.pdf62KB.com.exe	29
PID 908 wrote to memory of 2732	908	20250121-004Especificacinrequerida.pdf62KB.com.exe	29
PID 908 wrote to memory of 2732	908	20250121-004Especificacinrequerida.pdf62KB.com.exe	29
PID 908 wrote to memory of 2732	908	20250121-004Especificacinrequerida.pdf62KB.com.exe	29
PID 908 wrote to memory of 2732	908	20250121-004Especificacinrequerida.pdf62KB.com.exe	29
PID 2732 wrote to memory of 2832	2732	20250121-004Especificacinrequerida.pdf62KB.com.exe	30
PID 2732 wrote to memory of 2832	2732	20250121-004Especificacinrequerida.pdf62KB.com.exe	30
PID 2732 wrote to memory of 2832	2732	20250121-004Especificacinrequerida.pdf62KB.com.exe	30
PID 2732 wrote to memory of 2832	2732	20250121-004Especificacinrequerida.pdf62KB.com.exe	30
PID 2732 wrote to memory of 2084	2732	20250121-004Especificacinrequerida.pdf62KB.com.exe	32
PID 2732 wrote to memory of 2084	2732	20250121-004Especificacinrequerida.pdf62KB.com.exe	32
PID 2732 wrote to memory of 2084	2732	20250121-004Especificacinrequerida.pdf62KB.com.exe	32
PID 2732 wrote to memory of 2084	2732	20250121-004Especificacinrequerida.pdf62KB.com.exe	32
PID 2084 wrote to memory of 1792	2084	Excelworkbook.exe	33
PID 2084 wrote to memory of 1792	2084	Excelworkbook.exe	33
PID 2084 wrote to memory of 1792	2084	Excelworkbook.exe	33
PID 2084 wrote to memory of 1792	2084	Excelworkbook.exe	33
PID 2084 wrote to memory of 1128	2084	Excelworkbook.exe	34
PID 2084 wrote to memory of 1128	2084	Excelworkbook.exe	34
PID 2084 wrote to memory of 1128	2084	Excelworkbook.exe	34
PID 2084 wrote to memory of 1128	2084	Excelworkbook.exe	34
PID 2084 wrote to memory of 2908	2084	Excelworkbook.exe	35
PID 2084 wrote to memory of 2908	2084	Excelworkbook.exe	35
PID 2084 wrote to memory of 2908	2084	Excelworkbook.exe	35
PID 2084 wrote to memory of 2908	2084	Excelworkbook.exe	35
PID 2084 wrote to memory of 1032	2084	Excelworkbook.exe	36
PID 2084 wrote to memory of 1032	2084	Excelworkbook.exe	36
PID 2084 wrote to memory of 1032	2084	Excelworkbook.exe	36
PID 2084 wrote to memory of 1032	2084	Excelworkbook.exe	36
PID 2084 wrote to memory of 2096	2084	Excelworkbook.exe	37
PID 2084 wrote to memory of 2096	2084	Excelworkbook.exe	37
PID 2084 wrote to memory of 2096	2084	Excelworkbook.exe	37
PID 2084 wrote to memory of 2096	2084	Excelworkbook.exe	37

C:\Users\Admin\AppData\Local\Temp\20250121-004Especificacinrequerida.pdf62KB.com.exe
"C:\Users\Admin\AppData\Local\Temp\20250121-004Especificacinrequerida.pdf62KB.com.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:908
- C:\Users\Admin\AppData\Local\Temp\20250121-004Especificacinrequerida.pdf62KB.com.exe
  "C:\Users\Admin\AppData\Local\Temp\20250121-004Especificacinrequerida.pdf62KB.com.exe"
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2732
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "pdfdocument" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2832
- - C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2084
  - - C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe"
      4⤵
      Executes dropped EXE
      PID:1792
  - - C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe"
      4⤵
      Executes dropped EXE
      PID:1128
  - - C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe"
      4⤵
      Executes dropped EXE
      PID:2908
  - - C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe"
      4⤵
      Executes dropped EXE
      PID:1032
  - - C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe"
      4⤵
      Executes dropped EXE
      PID:2096

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

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Downloads

\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe

Filesize
3.7MB

MD5
570c14adf8743c7db308309f24e2955a

SHA1
217b4e17f050d5ea71dd981bb832df4f1a472442

SHA256
7300535ef26158bdb916366b717390fc36eb570473ed7805c18b101367c68af5

SHA512
1107773a533e0d8df7db216ad5a2eddb84463ccdf30adf67e7df5fc9d7681a2c9eafbaf5a62db4eef7e57cb120b64260e96030d9cb7fbd585750a43337e62fd0

Download Submit
memory/908-0-0x00000000747AE000-0x00000000747AF000-memory.dmp

Filesize
4KB

Download
memory/908-1-0x00000000008B0000-0x0000000000C64000-memory.dmp

Filesize
3.7MB

Download
memory/908-2-0x00000000747A0000-0x0000000074E8E000-memory.dmp

Filesize
6.9MB

Download
memory/908-3-0x0000000000880000-0x00000000008A6000-memory.dmp

Filesize
152KB

Download
memory/908-4-0x00000000747AE000-0x00000000747AF000-memory.dmp

Filesize
4KB

Download
memory/908-5-0x00000000747A0000-0x0000000074E8E000-memory.dmp

Filesize
6.9MB

Download
memory/908-6-0x000000000B590000-0x000000000B8F8000-memory.dmp

Filesize
3.4MB

Download
memory/908-21-0x00000000747A0000-0x0000000074E8E000-memory.dmp

Filesize
6.9MB

Download
memory/2084-33-0x00000000003D0000-0x0000000000784000-memory.dmp

Filesize
3.7MB

Download
memory/2732-18-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2732-13-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2732-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2732-10-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2732-9-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2732-19-0x00000000747A0000-0x0000000074E8E000-memory.dmp

Filesize
6.9MB

Download
memory/2732-20-0x00000000747A0000-0x0000000074E8E000-memory.dmp

Filesize
6.9MB

Download
memory/2732-15-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2732-8-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2732-7-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/2732-32-0x00000000747A0000-0x0000000074E8E000-memory.dmp

Filesize
6.9MB

Download