quasar | 17a4a1dd4588641ec5eb6ce7986b3c35ff57a13b6693f0f886339d29c746947d

Analysis

max time kernel
149s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
08-01-2025 16:23

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General

Target

QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe
Size

3.6MB
MD5

9b3c35a49dd56d6282a2a89832046ffc
SHA1

0cb9124335747f5dd253744a828d5e30ca7d06f3
SHA256

2234c3a3350dbeba11b7564dc52d5aa1252777f9ffe8dcf4027dcb54fc4542aa
SHA512

33b45162d1c4e1f6ab103b92921e5fe1754eb3ec1b062298b5b976bc887ef2d559102a2ce8c758c5f7e12e33973c46326a126599226250f941251553be4f2854
SSDEEP

98304:Xd36tNUGXT/1LirUtZDS7uJTtTD+ukiR+erm7fr2:X8tNFNLgQA7E9DtkoK7fK

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/1100-13-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar

Executes dropped EXE 2 IoCs

pid	Process
1472	Exccelworkbook.exe
924	Exccelworkbook.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3452 set thread context of 1100	3452	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	87
PID 1472 set thread context of 924	1472	Exccelworkbook.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	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).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
2996	schtasks.exe
3624	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3452	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe
3452	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3452	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe
Token: SeDebugPrivilege	1100	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe
Token: SeDebugPrivilege	924	Exccelworkbook.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
924	Exccelworkbook.exe

Suspicious use of WriteProcessMemory 28 IoCs

description	pid	Process	procid_target
PID 3452 wrote to memory of 2688	3452	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	86
PID 3452 wrote to memory of 2688	3452	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	86
PID 3452 wrote to memory of 2688	3452	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	86
PID 3452 wrote to memory of 1100	3452	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	87
PID 3452 wrote to memory of 1100	3452	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	87
PID 3452 wrote to memory of 1100	3452	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	87
PID 3452 wrote to memory of 1100	3452	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	87
PID 3452 wrote to memory of 1100	3452	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	87
PID 3452 wrote to memory of 1100	3452	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	87
PID 3452 wrote to memory of 1100	3452	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	87
PID 3452 wrote to memory of 1100	3452	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	87
PID 1100 wrote to memory of 2996	1100	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	88
PID 1100 wrote to memory of 2996	1100	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	88
PID 1100 wrote to memory of 2996	1100	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	88
PID 1100 wrote to memory of 1472	1100	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	90
PID 1100 wrote to memory of 1472	1100	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	90
PID 1100 wrote to memory of 1472	1100	QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe	90
PID 1472 wrote to memory of 924	1472	Exccelworkbook.exe	103
PID 1472 wrote to memory of 924	1472	Exccelworkbook.exe	103
PID 1472 wrote to memory of 924	1472	Exccelworkbook.exe	103
PID 1472 wrote to memory of 924	1472	Exccelworkbook.exe	103
PID 1472 wrote to memory of 924	1472	Exccelworkbook.exe	103
PID 1472 wrote to memory of 924	1472	Exccelworkbook.exe	103
PID 1472 wrote to memory of 924	1472	Exccelworkbook.exe	103
PID 1472 wrote to memory of 924	1472	Exccelworkbook.exe	103
PID 924 wrote to memory of 3624	924	Exccelworkbook.exe	104
PID 924 wrote to memory of 3624	924	Exccelworkbook.exe	104
PID 924 wrote to memory of 3624	924	Exccelworkbook.exe	104

C:\Users\Admin\AppData\Local\Temp\QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe
"C:\Users\Admin\AppData\Local\Temp\QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3452
- C:\Users\Admin\AppData\Local\Temp\QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe
  "C:\Users\Admin\AppData\Local\Temp\QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe"
  2⤵
  PID:2688
- C:\Users\Admin\AppData\Local\Temp\QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe
  "C:\Users\Admin\AppData\Local\Temp\QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1100
- - 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:2996
- - 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 use of WriteProcessMemory
    PID:1472
  - - 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:924
    - - 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:3624

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\QUOTATION - RFQ2496_PO 08775622879.pdf(87kb).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
9b3c35a49dd56d6282a2a89832046ffc

SHA1
0cb9124335747f5dd253744a828d5e30ca7d06f3

SHA256
2234c3a3350dbeba11b7564dc52d5aa1252777f9ffe8dcf4027dcb54fc4542aa

SHA512
33b45162d1c4e1f6ab103b92921e5fe1754eb3ec1b062298b5b976bc887ef2d559102a2ce8c758c5f7e12e33973c46326a126599226250f941251553be4f2854

Download Submit
memory/924-38-0x0000000007FE0000-0x0000000008046000-memory.dmp

Filesize
408KB

Download
memory/924-37-0x0000000007F30000-0x0000000007F6C000-memory.dmp

Filesize
240KB

Download
memory/924-36-0x0000000006BE0000-0x0000000006BF2000-memory.dmp

Filesize
72KB

Download
memory/924-33-0x0000000006A20000-0x0000000006AD2000-memory.dmp

Filesize
712KB

Download
memory/924-32-0x00000000067B0000-0x0000000006800000-memory.dmp

Filesize
320KB

Download
memory/924-31-0x0000000006C10000-0x0000000007228000-memory.dmp

Filesize
6.1MB

Download
memory/1100-13-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/1100-24-0x0000000074D00000-0x00000000754B0000-memory.dmp

Filesize
7.7MB

Download
memory/1100-17-0x0000000074D00000-0x00000000754B0000-memory.dmp

Filesize
7.7MB

Download
memory/1100-15-0x0000000074D00000-0x00000000754B0000-memory.dmp

Filesize
7.7MB

Download
memory/1472-26-0x0000000074D00000-0x00000000754B0000-memory.dmp

Filesize
7.7MB

Download
memory/1472-25-0x0000000074D00000-0x00000000754B0000-memory.dmp

Filesize
7.7MB

Download
memory/1472-30-0x0000000074D00000-0x00000000754B0000-memory.dmp

Filesize
7.7MB

Download
memory/3452-0-0x0000000074D0E000-0x0000000074D0F000-memory.dmp

Filesize
4KB

Download
memory/3452-11-0x0000000006450000-0x0000000006466000-memory.dmp

Filesize
88KB

Download
memory/3452-9-0x0000000074D00000-0x00000000754B0000-memory.dmp

Filesize
7.7MB

Download
memory/3452-8-0x0000000074D0E000-0x0000000074D0F000-memory.dmp

Filesize
4KB

Download
memory/3452-16-0x0000000074D00000-0x00000000754B0000-memory.dmp

Filesize
7.7MB

Download
memory/3452-7-0x00000000062D0000-0x00000000062E8000-memory.dmp

Filesize
96KB

Download
memory/3452-12-0x000000000B430000-0x000000000B798000-memory.dmp

Filesize
3.4MB

Download
memory/3452-10-0x0000000006440000-0x000000000644E000-memory.dmp

Filesize
56KB

Download
memory/3452-6-0x0000000005090000-0x000000000512C000-memory.dmp

Filesize
624KB

Download
memory/3452-5-0x0000000074D00000-0x00000000754B0000-memory.dmp

Filesize
7.7MB

Download
memory/3452-4-0x0000000004FB0000-0x0000000004FBA000-memory.dmp

Filesize
40KB

Download
memory/3452-3-0x0000000004EB0000-0x0000000004F42000-memory.dmp

Filesize
584KB

Download
memory/3452-2-0x0000000005460000-0x0000000005A04000-memory.dmp

Filesize
5.6MB

Download
memory/3452-1-0x00000000001E0000-0x0000000000580000-memory.dmp

Filesize
3.6MB

Download