quasar | 1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28

Analysis

max time kernel
93s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
11/01/2025, 02:28

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General

Target

1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe
Size

3.6MB
MD5

902afcb6d3f905ff4603200341f02874
SHA1

473fad4ac13e9c8b6b80d17ae3fb658b28d1cd47
SHA256

1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28
SHA512

e405ec77372dbf367c873d3531fc6455c44c4d185bd1a0b60c9314ea21b1b51f72818503366efaa8d2d322c7819763986a837e06845a0f81eacb6e4c1a98ec3c
SSDEEP

49152:Bg6eXlKawrTTN8CaimN0G0LI1yfuJDqHkN0IrmRZiLTqK2W3rcKmUd5mgo:BKVtw7N1aim/0pMtNrmRZu32W+Kgj

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/808-12-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar

Executes dropped EXE 4 IoCs

pid	Process
3596	Exccelworkbook.exe
668	Exccelworkbook.exe
2704	Exccelworkbook.exe
1184	Exccelworkbook.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 4916 set thread context of 808	4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	99
PID 3596 set thread context of 1184	3596	Exccelworkbook.exe	108

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	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.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
3224	schtasks.exe
548	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe
4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe
4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe
4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe
3596	Exccelworkbook.exe
3596	Exccelworkbook.exe
3596	Exccelworkbook.exe
3596	Exccelworkbook.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe
Token: SeDebugPrivilege	808	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe
Token: SeDebugPrivilege	3596	Exccelworkbook.exe
Token: SeDebugPrivilege	1184	Exccelworkbook.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1184	Exccelworkbook.exe

Suspicious use of WriteProcessMemory 37 IoCs

description	pid	Process	procid_target
PID 4916 wrote to memory of 4148	4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	97
PID 4916 wrote to memory of 4148	4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	97
PID 4916 wrote to memory of 4148	4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	97
PID 4916 wrote to memory of 4160	4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	98
PID 4916 wrote to memory of 4160	4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	98
PID 4916 wrote to memory of 4160	4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	98
PID 4916 wrote to memory of 808	4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	99
PID 4916 wrote to memory of 808	4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	99
PID 4916 wrote to memory of 808	4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	99
PID 4916 wrote to memory of 808	4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	99
PID 4916 wrote to memory of 808	4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	99
PID 4916 wrote to memory of 808	4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	99
PID 4916 wrote to memory of 808	4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	99
PID 4916 wrote to memory of 808	4916	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	99
PID 808 wrote to memory of 3224	808	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	100
PID 808 wrote to memory of 3224	808	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	100
PID 808 wrote to memory of 3224	808	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	100
PID 808 wrote to memory of 3596	808	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	102
PID 808 wrote to memory of 3596	808	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	102
PID 808 wrote to memory of 3596	808	1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe	102
PID 3596 wrote to memory of 668	3596	Exccelworkbook.exe	106
PID 3596 wrote to memory of 668	3596	Exccelworkbook.exe	106
PID 3596 wrote to memory of 668	3596	Exccelworkbook.exe	106
PID 3596 wrote to memory of 2704	3596	Exccelworkbook.exe	107
PID 3596 wrote to memory of 2704	3596	Exccelworkbook.exe	107
PID 3596 wrote to memory of 2704	3596	Exccelworkbook.exe	107
PID 3596 wrote to memory of 1184	3596	Exccelworkbook.exe	108
PID 3596 wrote to memory of 1184	3596	Exccelworkbook.exe	108
PID 3596 wrote to memory of 1184	3596	Exccelworkbook.exe	108
PID 3596 wrote to memory of 1184	3596	Exccelworkbook.exe	108
PID 3596 wrote to memory of 1184	3596	Exccelworkbook.exe	108
PID 3596 wrote to memory of 1184	3596	Exccelworkbook.exe	108
PID 3596 wrote to memory of 1184	3596	Exccelworkbook.exe	108
PID 3596 wrote to memory of 1184	3596	Exccelworkbook.exe	108
PID 1184 wrote to memory of 548	1184	Exccelworkbook.exe	109
PID 1184 wrote to memory of 548	1184	Exccelworkbook.exe	109
PID 1184 wrote to memory of 548	1184	Exccelworkbook.exe	109

C:\Users\Admin\AppData\Local\Temp\1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe
"C:\Users\Admin\AppData\Local\Temp\1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4916
- C:\Users\Admin\AppData\Local\Temp\1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe
  "C:\Users\Admin\AppData\Local\Temp\1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe"
  2⤵
  PID:4148
- C:\Users\Admin\AppData\Local\Temp\1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe
  "C:\Users\Admin\AppData\Local\Temp\1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe"
  2⤵
  PID:4160
- C:\Users\Admin\AppData\Local\Temp\1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe
  "C:\Users\Admin\AppData\Local\Temp\1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:808
- - 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:3224
- - 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:3596
  - - C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe"
      4⤵
      Executes dropped EXE
      PID:668
  - - C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe"
      4⤵
      Executes dropped EXE
      PID:2704
  - - 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:1184
    - - 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:548

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\1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28.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
902afcb6d3f905ff4603200341f02874

SHA1
473fad4ac13e9c8b6b80d17ae3fb658b28d1cd47

SHA256
1787fd4fd81dca24ca10625e93d43168eea906184da17183ba53a306856c0f28

SHA512
e405ec77372dbf367c873d3531fc6455c44c4d185bd1a0b60c9314ea21b1b51f72818503366efaa8d2d322c7819763986a837e06845a0f81eacb6e4c1a98ec3c

Download Submit
memory/808-12-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/808-24-0x0000000074DD0000-0x0000000075580000-memory.dmp

Filesize
7.7MB

Download
memory/808-16-0x0000000074DD0000-0x0000000075580000-memory.dmp

Filesize
7.7MB

Download
memory/808-14-0x0000000074DD0000-0x0000000075580000-memory.dmp

Filesize
7.7MB

Download
memory/1184-40-0x0000000008340000-0x00000000083A6000-memory.dmp

Filesize
408KB

Download
memory/1184-39-0x0000000008290000-0x00000000082CC000-memory.dmp

Filesize
240KB

Download
memory/1184-38-0x0000000006F40000-0x0000000006F52000-memory.dmp

Filesize
72KB

Download
memory/1184-35-0x0000000006D80000-0x0000000006E32000-memory.dmp

Filesize
712KB

Download
memory/1184-34-0x0000000006B10000-0x0000000006B60000-memory.dmp

Filesize
320KB

Download
memory/1184-33-0x0000000006F70000-0x0000000007588000-memory.dmp

Filesize
6.1MB

Download
memory/3596-26-0x0000000074DD0000-0x0000000075580000-memory.dmp

Filesize
7.7MB

Download
memory/3596-23-0x0000000074DD0000-0x0000000075580000-memory.dmp

Filesize
7.7MB

Download
memory/3596-32-0x0000000074DD0000-0x0000000075580000-memory.dmp

Filesize
7.7MB

Download
memory/3596-25-0x0000000074DD0000-0x0000000075580000-memory.dmp

Filesize
7.7MB

Download
memory/4916-0-0x0000000074DDE000-0x0000000074DDF000-memory.dmp

Filesize
4KB

Download
memory/4916-9-0x0000000074DDE000-0x0000000074DDF000-memory.dmp

Filesize
4KB

Download
memory/4916-8-0x0000000005A30000-0x0000000005A4C000-memory.dmp

Filesize
112KB

Download
memory/4916-7-0x0000000006BC0000-0x0000000006F5A000-memory.dmp

Filesize
3.6MB

Download
memory/4916-15-0x0000000074DD0000-0x0000000075580000-memory.dmp

Filesize
7.7MB

Download
memory/4916-11-0x0000000008F70000-0x00000000092D8000-memory.dmp

Filesize
3.4MB

Download
memory/4916-10-0x0000000074DD0000-0x0000000075580000-memory.dmp

Filesize
7.7MB

Download
memory/4916-6-0x0000000005760000-0x00000000057FC000-memory.dmp

Filesize
624KB

Download
memory/4916-5-0x0000000074DD0000-0x0000000075580000-memory.dmp

Filesize
7.7MB

Download
memory/4916-4-0x00000000054F0000-0x00000000054FA000-memory.dmp

Filesize
40KB

Download
memory/4916-3-0x0000000005410000-0x00000000054A2000-memory.dmp

Filesize
584KB

Download
memory/4916-2-0x0000000005AA0000-0x0000000006044000-memory.dmp

Filesize
5.6MB

Download
memory/4916-1-0x0000000000690000-0x0000000000A34000-memory.dmp

Filesize
3.6MB

Download