quasar | 3bee4d2ab33ac3f0605136f09cba556140d62ce9a0c1bdb1639159b43ae58943

Analysis

max time kernel
148s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
14-01-2025 10:53

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General

Target

pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe
Size

3.6MB
MD5

7ced1e3728202bb14170fdbcde4f69b2
SHA1

bf67ce43accf497ffa74caa94a5c09209b974f07
SHA256

3bee4d2ab33ac3f0605136f09cba556140d62ce9a0c1bdb1639159b43ae58943
SHA512

e71a9b4ec8ab4cb18c990e77ecb2fea86dd28cb769274bc34b31095b8124985edf4a5b3426c4cad59429ccae85726fcb476cf6e4053af0d902c4bb05ca703b3c
SSDEEP

98304:K4QM2Ie6bMOMcv6NVhbK3H055W5XHx85mSQVaT+50WkdEZM:lsILGjbKkfWhHW5mnVapWcg

Score

10^/10

quasar code discovery spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

CODE

twart.myfirewall.org:9792

rency.ydns.eu:5287

wqo9.firewall-gateway.de:8841

code1.ydns.eu:5287

wqo9.firewall-gateway.de:9792

Mutex

025351e291-5d1041-4fa37-932c7-869aeiQec514992

Attributes

encryption_key
3145298725BA5E0DD56E87FFE3F8898EA81E6EDA
install_name
Exccelworkbook.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/1404-11-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar

Executes dropped EXE 3 IoCs

pid	Process
1488	Exccelworkbook.exe
1528	Exccelworkbook.exe
2992	Exccelworkbook.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4760 set thread context of 1404	4760	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe	87
PID 1488 set thread context of 2992	1488	Exccelworkbook.exe	96

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	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Exccelworkbook.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Exccelworkbook.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
1004	schtasks.exe
4964	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1488	Exccelworkbook.exe
1488	Exccelworkbook.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1404	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe
Token: SeDebugPrivilege	1488	Exccelworkbook.exe
Token: SeDebugPrivilege	2992	Exccelworkbook.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2992	Exccelworkbook.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 4760 wrote to memory of 1404	4760	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe	87
PID 4760 wrote to memory of 1404	4760	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe	87
PID 4760 wrote to memory of 1404	4760	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe	87
PID 4760 wrote to memory of 1404	4760	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe	87
PID 4760 wrote to memory of 1404	4760	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe	87
PID 4760 wrote to memory of 1404	4760	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe	87
PID 4760 wrote to memory of 1404	4760	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe	87
PID 4760 wrote to memory of 1404	4760	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe	87
PID 1404 wrote to memory of 1004	1404	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe	90
PID 1404 wrote to memory of 1004	1404	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe	90
PID 1404 wrote to memory of 1004	1404	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe	90
PID 1404 wrote to memory of 1488	1404	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe	92
PID 1404 wrote to memory of 1488	1404	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe	92
PID 1404 wrote to memory of 1488	1404	pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe	92
PID 1488 wrote to memory of 1528	1488	Exccelworkbook.exe	95
PID 1488 wrote to memory of 1528	1488	Exccelworkbook.exe	95
PID 1488 wrote to memory of 1528	1488	Exccelworkbook.exe	95
PID 1488 wrote to memory of 2992	1488	Exccelworkbook.exe	96
PID 1488 wrote to memory of 2992	1488	Exccelworkbook.exe	96
PID 1488 wrote to memory of 2992	1488	Exccelworkbook.exe	96
PID 1488 wrote to memory of 2992	1488	Exccelworkbook.exe	96
PID 1488 wrote to memory of 2992	1488	Exccelworkbook.exe	96
PID 1488 wrote to memory of 2992	1488	Exccelworkbook.exe	96
PID 1488 wrote to memory of 2992	1488	Exccelworkbook.exe	96
PID 1488 wrote to memory of 2992	1488	Exccelworkbook.exe	96
PID 2992 wrote to memory of 4964	2992	Exccelworkbook.exe	97
PID 2992 wrote to memory of 4964	2992	Exccelworkbook.exe	97
PID 2992 wrote to memory of 4964	2992	Exccelworkbook.exe	97

C:\Users\Admin\AppData\Local\Temp\pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe
"C:\Users\Admin\AppData\Local\Temp\pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4760
- C:\Users\Admin\AppData\Local\Temp\pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe
  "C:\Users\Admin\AppData\Local\Temp\pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1404
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "pdfdocument" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1004
- - C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1488
  - - C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe"
      4⤵
      Executes dropped EXE
      PID:1528
  - - C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:2992
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "pdfdocument" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe" /rl HIGHEST /f
        5⤵
        System Location Discovery: System Language Discovery
        Scheduled Task/Job: Scheduled Task
        
        PID:4964

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

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\pdf_2025 QUOTATION - #202401146778.pdf (83kb).com.exe.log

Filesize
1KB

MD5
8ec831f3e3a3f77e4a7b9cd32b48384c

SHA1
d83f09fd87c5bd86e045873c231c14836e76a05c

SHA256
7667e538030e3f8ce2886e47a01af24cb0ea70528b1e821c5d8832c5076cb982

SHA512
26bffa2406b66368bd412bf25869a792631455645992cdcade2dbc13a2e56fb546414a6a9223b94c96c38d89187add6678d4779a88b38b0c9e36be8527b213c3

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

Filesize
3.6MB

MD5
7ced1e3728202bb14170fdbcde4f69b2

SHA1
bf67ce43accf497ffa74caa94a5c09209b974f07

SHA256
3bee4d2ab33ac3f0605136f09cba556140d62ce9a0c1bdb1639159b43ae58943

SHA512
e71a9b4ec8ab4cb18c990e77ecb2fea86dd28cb769274bc34b31095b8124985edf4a5b3426c4cad59429ccae85726fcb476cf6e4053af0d902c4bb05ca703b3c

Download Submit
memory/1404-11-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/1404-22-0x0000000074660000-0x0000000074E10000-memory.dmp

Filesize
7.7MB

Download
memory/1404-15-0x0000000074660000-0x0000000074E10000-memory.dmp

Filesize
7.7MB

Download
memory/1404-13-0x0000000074660000-0x0000000074E10000-memory.dmp

Filesize
7.7MB

Download
memory/1488-30-0x0000000074660000-0x0000000074E10000-memory.dmp

Filesize
7.7MB

Download
memory/1488-23-0x0000000074660000-0x0000000074E10000-memory.dmp

Filesize
7.7MB

Download
memory/1488-25-0x0000000074660000-0x0000000074E10000-memory.dmp

Filesize
7.7MB

Download
memory/1488-24-0x0000000074660000-0x0000000074E10000-memory.dmp

Filesize
7.7MB

Download
memory/2992-31-0x0000000006CF0000-0x0000000007308000-memory.dmp

Filesize
6.1MB

Download
memory/2992-32-0x0000000006870000-0x00000000068C0000-memory.dmp

Filesize
320KB

Download
memory/2992-38-0x00000000081E0000-0x0000000008246000-memory.dmp

Filesize
408KB

Download
memory/2992-37-0x0000000008130000-0x000000000816C000-memory.dmp

Filesize
240KB

Download
memory/2992-36-0x00000000080D0000-0x00000000080E2000-memory.dmp

Filesize
72KB

Download
memory/2992-33-0x0000000006AE0000-0x0000000006B92000-memory.dmp

Filesize
712KB

Download
memory/4760-3-0x00000000055A0000-0x0000000005632000-memory.dmp

Filesize
584KB

Download
memory/4760-10-0x000000000C570000-0x000000000C60C000-memory.dmp

Filesize
624KB

Download
memory/4760-1-0x0000000000810000-0x0000000000BB2000-memory.dmp

Filesize
3.6MB

Download
memory/4760-9-0x0000000007ED0000-0x0000000008238000-memory.dmp

Filesize
3.4MB

Download
memory/4760-8-0x0000000074660000-0x0000000074E10000-memory.dmp

Filesize
7.7MB

Download
memory/4760-0-0x000000007466E000-0x000000007466F000-memory.dmp

Filesize
4KB

Download
memory/4760-7-0x000000007466E000-0x000000007466F000-memory.dmp

Filesize
4KB

Download
memory/4760-2-0x0000000005C50000-0x00000000061F4000-memory.dmp

Filesize
5.6MB

Download
memory/4760-6-0x00000000059A0000-0x00000000059BA000-memory.dmp

Filesize
104KB

Download
memory/4760-4-0x0000000074660000-0x0000000074E10000-memory.dmp

Filesize
7.7MB

Download
memory/4760-14-0x0000000074660000-0x0000000074E10000-memory.dmp

Filesize
7.7MB

Download
memory/4760-5-0x0000000005650000-0x000000000565A000-memory.dmp

Filesize
40KB

Download