quasar | 7300535ef26158bdb916366b717390fc36eb570473ed7805c18b101367c68af5

Analysis

max time kernel
93s
max time network
144s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-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 1 IoCs

resource	yara_rule
behavioral2/memory/4368-11-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar

Executes dropped EXE 2 IoCs

pid	Process
2728	Excelworkbook.exe
4028	Excelworkbook.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4252 set thread context of 4368	4252	20250121-004Especificacinrequerida.pdf62KB.com.exe	93
PID 2728 set thread context of 4028	2728	Excelworkbook.exe	103

System Location Discovery: System Language Discovery 1 TTPs 6 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	schtasks.exe
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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Excelworkbook.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
2376	schtasks.exe
3988	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4252	20250121-004Especificacinrequerida.pdf62KB.com.exe
4252	20250121-004Especificacinrequerida.pdf62KB.com.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	4252	20250121-004Especificacinrequerida.pdf62KB.com.exe
Token: SeDebugPrivilege	4368	20250121-004Especificacinrequerida.pdf62KB.com.exe
Token: SeDebugPrivilege	4028	Excelworkbook.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4028	Excelworkbook.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 4252 wrote to memory of 4880	4252	20250121-004Especificacinrequerida.pdf62KB.com.exe	92
PID 4252 wrote to memory of 4880	4252	20250121-004Especificacinrequerida.pdf62KB.com.exe	92
PID 4252 wrote to memory of 4880	4252	20250121-004Especificacinrequerida.pdf62KB.com.exe	92
PID 4252 wrote to memory of 4368	4252	20250121-004Especificacinrequerida.pdf62KB.com.exe	93
PID 4252 wrote to memory of 4368	4252	20250121-004Especificacinrequerida.pdf62KB.com.exe	93
PID 4252 wrote to memory of 4368	4252	20250121-004Especificacinrequerida.pdf62KB.com.exe	93
PID 4252 wrote to memory of 4368	4252	20250121-004Especificacinrequerida.pdf62KB.com.exe	93
PID 4252 wrote to memory of 4368	4252	20250121-004Especificacinrequerida.pdf62KB.com.exe	93
PID 4252 wrote to memory of 4368	4252	20250121-004Especificacinrequerida.pdf62KB.com.exe	93
PID 4252 wrote to memory of 4368	4252	20250121-004Especificacinrequerida.pdf62KB.com.exe	93
PID 4252 wrote to memory of 4368	4252	20250121-004Especificacinrequerida.pdf62KB.com.exe	93
PID 4368 wrote to memory of 2376	4368	20250121-004Especificacinrequerida.pdf62KB.com.exe	97
PID 4368 wrote to memory of 2376	4368	20250121-004Especificacinrequerida.pdf62KB.com.exe	97
PID 4368 wrote to memory of 2376	4368	20250121-004Especificacinrequerida.pdf62KB.com.exe	97
PID 4368 wrote to memory of 2728	4368	20250121-004Especificacinrequerida.pdf62KB.com.exe	99
PID 4368 wrote to memory of 2728	4368	20250121-004Especificacinrequerida.pdf62KB.com.exe	99
PID 4368 wrote to memory of 2728	4368	20250121-004Especificacinrequerida.pdf62KB.com.exe	99
PID 2728 wrote to memory of 4028	2728	Excelworkbook.exe	103
PID 2728 wrote to memory of 4028	2728	Excelworkbook.exe	103
PID 2728 wrote to memory of 4028	2728	Excelworkbook.exe	103
PID 2728 wrote to memory of 4028	2728	Excelworkbook.exe	103
PID 2728 wrote to memory of 4028	2728	Excelworkbook.exe	103
PID 2728 wrote to memory of 4028	2728	Excelworkbook.exe	103
PID 2728 wrote to memory of 4028	2728	Excelworkbook.exe	103
PID 2728 wrote to memory of 4028	2728	Excelworkbook.exe	103
PID 4028 wrote to memory of 3988	4028	Excelworkbook.exe	104
PID 4028 wrote to memory of 3988	4028	Excelworkbook.exe	104
PID 4028 wrote to memory of 3988	4028	Excelworkbook.exe	104

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 behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4252
- C:\Users\Admin\AppData\Local\Temp\20250121-004Especificacinrequerida.pdf62KB.com.exe
  "C:\Users\Admin\AppData\Local\Temp\20250121-004Especificacinrequerida.pdf62KB.com.exe"
  2⤵
  PID:4880
- C:\Users\Admin\AppData\Local\Temp\20250121-004Especificacinrequerida.pdf62KB.com.exe
  "C:\Users\Admin\AppData\Local\Temp\20250121-004Especificacinrequerida.pdf62KB.com.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4368
- - 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:2376
- - C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2728
  - - C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:4028
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "pdfdocument" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe" /rl HIGHEST /f
        5⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:3988

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

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\20250121-004Especificacinrequerida.pdf62KB.com.exe.log

Filesize
1KB

MD5
8ec831f3e3a3f77e4a7b9cd32b48384c

SHA1
d83f09fd87c5bd86e045873c231c14836e76a05c

SHA256
7667e538030e3f8ce2886e47a01af24cb0ea70528b1e821c5d8832c5076cb982

SHA512
26bffa2406b66368bd412bf25869a792631455645992cdcade2dbc13a2e56fb546414a6a9223b94c96c38d89187add6678d4779a88b38b0c9e36be8527b213c3

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Excelworkbook.exe

Filesize
3.7MB

MD5
570c14adf8743c7db308309f24e2955a

SHA1
217b4e17f050d5ea71dd981bb832df4f1a472442

SHA256
7300535ef26158bdb916366b717390fc36eb570473ed7805c18b101367c68af5

SHA512
1107773a533e0d8df7db216ad5a2eddb84463ccdf30adf67e7df5fc9d7681a2c9eafbaf5a62db4eef7e57cb120b64260e96030d9cb7fbd585750a43337e62fd0

Download Submit
memory/2728-29-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/2728-25-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/2728-24-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/2728-23-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/4028-37-0x0000000007F30000-0x0000000007F96000-memory.dmp

Filesize
408KB

Download
memory/4028-36-0x0000000007E80000-0x0000000007EBC000-memory.dmp

Filesize
240KB

Download
memory/4028-35-0x00000000069F0000-0x0000000006A02000-memory.dmp

Filesize
72KB

Download
memory/4028-32-0x0000000006830000-0x00000000068E2000-memory.dmp

Filesize
712KB

Download
memory/4028-31-0x00000000065C0000-0x0000000006610000-memory.dmp

Filesize
320KB

Download
memory/4028-30-0x0000000006A20000-0x0000000007038000-memory.dmp

Filesize
6.1MB

Download
memory/4252-7-0x0000000006880000-0x00000000068A6000-memory.dmp

Filesize
152KB

Download
memory/4252-6-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/4252-1-0x00000000008C0000-0x0000000000C74000-memory.dmp

Filesize
3.7MB

Download
memory/4252-2-0x0000000005AC0000-0x0000000006064000-memory.dmp

Filesize
5.6MB

Download
memory/4252-3-0x0000000005510000-0x00000000055A2000-memory.dmp

Filesize
584KB

Download
memory/4252-4-0x00000000054E0000-0x00000000054EA000-memory.dmp

Filesize
40KB

Download
memory/4252-10-0x000000000B2E0000-0x000000000B648000-memory.dmp

Filesize
3.4MB

Download
memory/4252-9-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/4252-8-0x000000007468E000-0x000000007468F000-memory.dmp

Filesize
4KB

Download
memory/4252-0-0x000000007468E000-0x000000007468F000-memory.dmp

Filesize
4KB

Download
memory/4252-14-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/4252-5-0x00000000057A0000-0x000000000583C000-memory.dmp

Filesize
624KB

Download
memory/4368-11-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/4368-22-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/4368-13-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download
memory/4368-15-0x0000000074680000-0x0000000074E30000-memory.dmp

Filesize
7.7MB

Download