quasar | b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571

Analysis

max time kernel
93s
max time network
145s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
30-01-2025 03:28

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General

Target

b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe
Size

3.6MB
MD5

678283be56a5f0178969a88915020601
SHA1

49932acde6ce46c7e2c982985deff7297667934a
SHA256

b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571
SHA512

c8a51bde2f62d7230cd350b82942fd1de149843dd006e6de9dbc8149f0009b11c02d86313d4a676f3590f2e7af00e5eee6107b15f5af0378a1fc722435ec5df5
SSDEEP

98304:Ro+TeAkm0hMH+Xv590DRdEww+EwJVeZy2:RZ63pMH+Xv5GnEww+E2VeZf

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/1128-11-0x0000000000400000-0x0000000000724000-memory.dmp	family_quasar

Executes dropped EXE 5 IoCs

pid	Process
4020	Exccelworkbook.exe
1004	Exccelworkbook.exe
1100	Exccelworkbook.exe
4176	Exccelworkbook.exe
3656	Exccelworkbook.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1608 set thread context of 1128	1608	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	90
PID 4020 set thread context of 3656	4020	Exccelworkbook.exe	98

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	Exccelworkbook.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Exccelworkbook.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.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
4524	schtasks.exe
3416	schtasks.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
1608	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe
1608	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe
4020	Exccelworkbook.exe
4020	Exccelworkbook.exe
4020	Exccelworkbook.exe
4020	Exccelworkbook.exe
4020	Exccelworkbook.exe
4020	Exccelworkbook.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1608	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe
Token: SeDebugPrivilege	1128	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe
Token: SeDebugPrivilege	4020	Exccelworkbook.exe
Token: SeDebugPrivilege	3656	Exccelworkbook.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3656	Exccelworkbook.exe

Suspicious use of WriteProcessMemory 37 IoCs

description	pid	Process	procid_target
PID 1608 wrote to memory of 5032	1608	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	89
PID 1608 wrote to memory of 5032	1608	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	89
PID 1608 wrote to memory of 5032	1608	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	89
PID 1608 wrote to memory of 1128	1608	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	90
PID 1608 wrote to memory of 1128	1608	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	90
PID 1608 wrote to memory of 1128	1608	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	90
PID 1608 wrote to memory of 1128	1608	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	90
PID 1608 wrote to memory of 1128	1608	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	90
PID 1608 wrote to memory of 1128	1608	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	90
PID 1608 wrote to memory of 1128	1608	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	90
PID 1608 wrote to memory of 1128	1608	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	90
PID 1128 wrote to memory of 3416	1128	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	91
PID 1128 wrote to memory of 3416	1128	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	91
PID 1128 wrote to memory of 3416	1128	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	91
PID 1128 wrote to memory of 4020	1128	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	93
PID 1128 wrote to memory of 4020	1128	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	93
PID 1128 wrote to memory of 4020	1128	b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe	93
PID 4020 wrote to memory of 1004	4020	Exccelworkbook.exe	95
PID 4020 wrote to memory of 1004	4020	Exccelworkbook.exe	95
PID 4020 wrote to memory of 1004	4020	Exccelworkbook.exe	95
PID 4020 wrote to memory of 1100	4020	Exccelworkbook.exe	96
PID 4020 wrote to memory of 1100	4020	Exccelworkbook.exe	96
PID 4020 wrote to memory of 1100	4020	Exccelworkbook.exe	96
PID 4020 wrote to memory of 4176	4020	Exccelworkbook.exe	97
PID 4020 wrote to memory of 4176	4020	Exccelworkbook.exe	97
PID 4020 wrote to memory of 4176	4020	Exccelworkbook.exe	97
PID 4020 wrote to memory of 3656	4020	Exccelworkbook.exe	98
PID 4020 wrote to memory of 3656	4020	Exccelworkbook.exe	98
PID 4020 wrote to memory of 3656	4020	Exccelworkbook.exe	98
PID 4020 wrote to memory of 3656	4020	Exccelworkbook.exe	98
PID 4020 wrote to memory of 3656	4020	Exccelworkbook.exe	98
PID 4020 wrote to memory of 3656	4020	Exccelworkbook.exe	98
PID 4020 wrote to memory of 3656	4020	Exccelworkbook.exe	98
PID 4020 wrote to memory of 3656	4020	Exccelworkbook.exe	98
PID 3656 wrote to memory of 4524	3656	Exccelworkbook.exe	99
PID 3656 wrote to memory of 4524	3656	Exccelworkbook.exe	99
PID 3656 wrote to memory of 4524	3656	Exccelworkbook.exe	99

C:\Users\Admin\AppData\Local\Temp\b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe
"C:\Users\Admin\AppData\Local\Temp\b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1608
- C:\Users\Admin\AppData\Local\Temp\b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe
  "C:\Users\Admin\AppData\Local\Temp\b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe"
  2⤵
  PID:5032
- C:\Users\Admin\AppData\Local\Temp\b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe
  "C:\Users\Admin\AppData\Local\Temp\b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1128
- - 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:3416
- - 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:4020
  - - C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe"
      4⤵
      Executes dropped EXE
      PID:1004
  - - C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe"
      4⤵
      Executes dropped EXE
      PID:1100
  - - C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Exccelworkbook.exe"
      4⤵
      Executes dropped EXE
      PID:4176
  - - 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:3656
    - - 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:4524

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\b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571.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
678283be56a5f0178969a88915020601

SHA1
49932acde6ce46c7e2c982985deff7297667934a

SHA256
b35f831b82f4648f91b37d8b8799cb26d30b069a52cf12e14ba9b4c06e8fb571

SHA512
c8a51bde2f62d7230cd350b82942fd1de149843dd006e6de9dbc8149f0009b11c02d86313d4a676f3590f2e7af00e5eee6107b15f5af0378a1fc722435ec5df5

Download Submit
memory/1128-11-0x0000000000400000-0x0000000000724000-memory.dmp

Filesize
3.1MB

Download
memory/1128-22-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/1128-15-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/1128-13-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/1608-7-0x00000000750CE000-0x00000000750CF000-memory.dmp

Filesize
4KB

Download
memory/1608-1-0x0000000000770000-0x0000000000B12000-memory.dmp

Filesize
3.6MB

Download
memory/1608-8-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/1608-9-0x000000000B700000-0x000000000BA68000-memory.dmp

Filesize
3.4MB

Download
memory/1608-10-0x000000000A550000-0x000000000A5EC000-memory.dmp

Filesize
624KB

Download
memory/1608-6-0x0000000007DF0000-0x0000000007E0E000-memory.dmp

Filesize
120KB

Download
memory/1608-5-0x0000000005510000-0x000000000551A000-memory.dmp

Filesize
40KB

Download
memory/1608-14-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/1608-4-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/1608-3-0x0000000005570000-0x0000000005602000-memory.dmp

Filesize
584KB

Download
memory/1608-2-0x0000000005B20000-0x00000000060C4000-memory.dmp

Filesize
5.6MB

Download
memory/1608-0-0x00000000750CE000-0x00000000750CF000-memory.dmp

Filesize
4KB

Download
memory/3656-33-0x0000000006F10000-0x0000000007528000-memory.dmp

Filesize
6.1MB

Download
memory/3656-34-0x0000000006A70000-0x0000000006AC0000-memory.dmp

Filesize
320KB

Download
memory/3656-35-0x0000000006CE0000-0x0000000006D92000-memory.dmp

Filesize
712KB

Download
memory/3656-38-0x0000000006EE0000-0x0000000006EF2000-memory.dmp

Filesize
72KB

Download
memory/3656-39-0x00000000080B0000-0x00000000080EC000-memory.dmp

Filesize
240KB

Download
memory/3656-40-0x0000000008160000-0x00000000081C6000-memory.dmp

Filesize
408KB

Download
memory/4020-24-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/4020-25-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/4020-32-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/4020-23-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download