quasar | b893220d33f9b8a0f98702bb577e4459792253ae651bdc18a93145ccd008af54

Analysis

max time kernel
141s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
02/11/2024, 15:22

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General

Target
0x00080000000174cc-36.exe
Size 534KB
Sample241102-sr8taaxgma
SHA256 b893220d33f9b8a0f98702bb577e4459792253ae651bdc18a93145ccd008af54
MD5 81b2c5c64951b603480d40d321540ff2
SHA1 314199ad92baeb203f5555ff3814e9b7a4f226f8
SHA512 3a57655bf7aa18a34364659553aad26a3d5b8946b957441f5fedebab5936b6bb2c71c6337837ead486a001b6a9227437cc5c4ec4a5de627f0e2db10dc6afdea6
SSDEEP 6144:78fG1BIgrx8kFYLTiMkbQEju0KoivMbi7DSVmh6Khe535h+GofOlblwXH/Gy3V8O:HPx7FYPiMQRcRDF4uy33ofAblwX2S
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar venomrat office04 discovery evasion rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office04

146.190.29.250:7812

Mutex

VNM_MUTEX_h1gQxrpyccCFZq7JPS

Attributes

encryption_key
V5fWyT4tQqXFouaUUxe2
install_name
Windows Security.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Update
subdirectory
SubDir34

Signatures

Contains code to disable Windows Defender 2 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

resource	yara_rule
behavioral2/memory/3296-1-0x0000000000B60000-0x0000000000BEC000-memory.dmp	disable_win_def
behavioral2/files/0x000d000000023b35-11.dat	disable_win_def

Modifies Windows Defender Real-time Protection settings 3 TTPs 4 IoCs

evasion trojan

Modify Registry

T1112

Windows Service

T1543.003

Disable or Modify Tools

T1562.001

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	0x00080000000174cc-36.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	0x00080000000174cc-36.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	0x00080000000174cc-36.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	0x00080000000174cc-36.exe

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 2 IoCs

resource	yara_rule
behavioral2/memory/3296-1-0x0000000000B60000-0x0000000000BEC000-memory.dmp	family_quasar
behavioral2/files/0x000d000000023b35-11.dat	family_quasar

VenomRAT
VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.
rat rootkit stealer venomrat
Venomrat family
venomrat

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	0x00080000000174cc-36.exe

Executes dropped EXE 1 IoCs

pid	Process
1496	Windows Security.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	0x00080000000174cc-36.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	0x00080000000174cc-36.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
13	ip-api.com

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 11 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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	0x00080000000174cc-36.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	chcp.com
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	0x00080000000174cc-36.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Windows Security.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 1 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
1372	PING.EXE

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1372	PING.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
3720	schtasks.exe
3840	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
1812	powershell.exe
1812	powershell.exe
3296	0x00080000000174cc-36.exe
3296	0x00080000000174cc-36.exe
3296	0x00080000000174cc-36.exe
3296	0x00080000000174cc-36.exe
3296	0x00080000000174cc-36.exe
3296	0x00080000000174cc-36.exe
3296	0x00080000000174cc-36.exe
2368	0x00080000000174cc-36.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	3296	0x00080000000174cc-36.exe
Token: SeDebugPrivilege	1812	powershell.exe
Token: SeDebugPrivilege	1496	Windows Security.exe
Token: SeDebugPrivilege	1496	Windows Security.exe
Token: SeDebugPrivilege	2368	0x00080000000174cc-36.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1496	Windows Security.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 3296 wrote to memory of 3720	3296	0x00080000000174cc-36.exe	88
PID 3296 wrote to memory of 3720	3296	0x00080000000174cc-36.exe	88
PID 3296 wrote to memory of 3720	3296	0x00080000000174cc-36.exe	88
PID 3296 wrote to memory of 1496	3296	0x00080000000174cc-36.exe	90
PID 3296 wrote to memory of 1496	3296	0x00080000000174cc-36.exe	90
PID 3296 wrote to memory of 1496	3296	0x00080000000174cc-36.exe	90
PID 3296 wrote to memory of 1812	3296	0x00080000000174cc-36.exe	91
PID 3296 wrote to memory of 1812	3296	0x00080000000174cc-36.exe	91
PID 3296 wrote to memory of 1812	3296	0x00080000000174cc-36.exe	91
PID 1496 wrote to memory of 3840	1496	Windows Security.exe	95
PID 1496 wrote to memory of 3840	1496	Windows Security.exe	95
PID 1496 wrote to memory of 3840	1496	Windows Security.exe	95
PID 3296 wrote to memory of 1664	3296	0x00080000000174cc-36.exe	104
PID 3296 wrote to memory of 1664	3296	0x00080000000174cc-36.exe	104
PID 3296 wrote to memory of 1664	3296	0x00080000000174cc-36.exe	104
PID 1664 wrote to memory of 2192	1664	cmd.exe	106
PID 1664 wrote to memory of 2192	1664	cmd.exe	106
PID 1664 wrote to memory of 2192	1664	cmd.exe	106
PID 3296 wrote to memory of 444	3296	0x00080000000174cc-36.exe	110
PID 3296 wrote to memory of 444	3296	0x00080000000174cc-36.exe	110
PID 3296 wrote to memory of 444	3296	0x00080000000174cc-36.exe	110
PID 444 wrote to memory of 3904	444	cmd.exe	112
PID 444 wrote to memory of 3904	444	cmd.exe	112
PID 444 wrote to memory of 3904	444	cmd.exe	112
PID 444 wrote to memory of 1372	444	cmd.exe	113
PID 444 wrote to memory of 1372	444	cmd.exe	113
PID 444 wrote to memory of 1372	444	cmd.exe	113
PID 444 wrote to memory of 2368	444	cmd.exe	116
PID 444 wrote to memory of 2368	444	cmd.exe	116
PID 444 wrote to memory of 2368	444	cmd.exe	116

C:\Users\Admin\AppData\Local\Temp\0x00080000000174cc-36.exe
"C:\Users\Admin\AppData\Local\Temp\0x00080000000174cc-36.exe"
1⤵
- Modifies Windows Defender Real-time Protection settings
- Checks computer location settings
- Windows security modification
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3296
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\0x00080000000174cc-36.exe" /rl HIGHEST /f
  2⤵
  - System Location Discovery: System Language Discovery
  - Scheduled Task/Job: Scheduled Task
  PID:3720
- C:\Users\Admin\AppData\Roaming\SubDir34\Windows Security.exe
  "C:\Users\Admin\AppData\Roaming\SubDir34\Windows Security.exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1496
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir34\Windows Security.exe" /rl HIGHEST /f
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3840
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell" Get-MpPreference -verbose
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1812
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1664
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2192
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\YefzkwG5mqtG.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:444
- - C:\Windows\SysWOW64\chcp.com
    chcp 65001
    3⤵
    - System Location Discovery: System Language Discovery
    PID:3904
- - C:\Windows\SysWOW64\PING.EXE
    ping -n 10 localhost
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:1372
- - C:\Users\Admin\AppData\Local\Temp\0x00080000000174cc-36.exe
    "C:\Users\Admin\AppData\Local\Temp\0x00080000000174cc-36.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2368

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

0x00080000000174cc-36.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\0x00080000000174cc-36.exe.log
Size 1KB
SHA256 f49dbd55029bfbc15134f7c6a4f967d6c39142c63f2e8f1f8c78fab108a2c928
MD5 10eab9c2684febb5327b6976f2047587
SHA1 a12ed54146a7f5c4c580416aecb899549712449e
SHA512 7e5fd90fffae723bd0c662a90e0730b507805f072771ee673d1d8c262dbf60c8a03ba5fe088f699a97c2e886380de158b2ccd59ee62e3d012dd6dd14ea9d0e50
MD5 SHA1 SHA512

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YefzkwG5mqtG.bat

Path C:\Users\Admin\AppData\Local\Temp\YefzkwG5mqtG.bat
Size 218B
SHA256 1fa034af2f000e5f618b1250d34290982c64fa938699ab08ee5bf6fbee4a71c4
MD5 69e7eed08b1ded83051b4a44492d5f6e
SHA1 f5f38e993d151a3f94e84d366041a69ed9222f9c
SHA512 4179426b94d68131f74a25204cd739f1e7d6c6140fba571e364104a24e3e0930e27f0eafa2e873fa4758108a9c1ab723864a6af7632f1fc1efbc5a923a604dff
MD5 SHA1 SHA512

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__PSScriptPolicyTest_jyzqbcp1.ww1.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_jyzqbcp1.ww1.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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Windows Security.exe

Path C:\Users\Admin\AppData\Roaming\SubDir34\Windows Security.exe
Size 534KB
SHA256 b893220d33f9b8a0f98702bb577e4459792253ae651bdc18a93145ccd008af54
MD5 81b2c5c64951b603480d40d321540ff2
SHA1 314199ad92baeb203f5555ff3814e9b7a4f226f8
SHA512 3a57655bf7aa18a34364659553aad26a3d5b8946b957441f5fedebab5936b6bb2c71c6337837ead486a001b6a9227437cc5c4ec4a5de627f0e2db10dc6afdea6
SSDEEP 6144:78fG1BIgrx8kFYLTiMkbQEju0KoivMbi7DSVmh6Khe535h+GofOlblwXH/Gy3V8O:HPx7FYPiMQRcRDF4uy33ofAblwX2S
MD5 SHA1 SHA512 SSDEEP

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memory/1496-13-0x0000000075120000-0x00000000758D0000-memory.dmp

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memory/1496-64-0x0000000075120000-0x00000000758D0000-memory.dmp

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memory/1496-63-0x0000000075120000-0x00000000758D0000-memory.dmp

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memory/1496-35-0x0000000006F40000-0x0000000006F4A000-memory.dmp

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memory/1496-14-0x0000000075120000-0x00000000758D0000-memory.dmp

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memory/1812-15-0x0000000004920000-0x0000000004956000-memory.dmp

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memory/1812-32-0x0000000005F00000-0x0000000005F1E000-memory.dmp

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memory/1812-62-0x0000000075120000-0x00000000758D0000-memory.dmp

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memory/1812-16-0x0000000075120000-0x00000000758D0000-memory.dmp

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memory/1812-17-0x0000000075120000-0x00000000758D0000-memory.dmp

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memory/1812-18-0x0000000005000000-0x0000000005628000-memory.dmp

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memory/1812-19-0x0000000075120000-0x00000000758D0000-memory.dmp

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memory/1812-21-0x0000000005720000-0x0000000005786000-memory.dmp

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memory/1812-20-0x0000000004F40000-0x0000000004F62000-memory.dmp

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memory/1812-59-0x0000000007540000-0x0000000007548000-memory.dmp

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memory/1812-31-0x0000000005900000-0x0000000005C54000-memory.dmp

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memory/1812-55-0x0000000007450000-0x000000000745E000-memory.dmp

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memory/1812-33-0x0000000005F90000-0x0000000005FDC000-memory.dmp

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memory/1812-58-0x0000000007560000-0x000000000757A000-memory.dmp

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memory/1812-36-0x00000000064C0000-0x00000000064F2000-memory.dmp

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memory/1812-37-0x0000000070520000-0x000000007056C000-memory.dmp

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memory/1812-47-0x0000000006ED0000-0x0000000006EEE000-memory.dmp

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memory/1812-48-0x0000000006EF0000-0x0000000006F93000-memory.dmp

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memory/1812-49-0x0000000007860000-0x0000000007EDA000-memory.dmp

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memory/1812-50-0x0000000007220000-0x000000000723A000-memory.dmp

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memory/1812-57-0x0000000007460000-0x0000000007474000-memory.dmp

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memory/1812-52-0x0000000007290000-0x000000000729A000-memory.dmp

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memory/1812-53-0x00000000074A0000-0x0000000007536000-memory.dmp

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memory/1812-54-0x0000000007420000-0x0000000007431000-memory.dmp

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memory/3296-6-0x00000000062D0000-0x00000000062E2000-memory.dmp

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memory/3296-56-0x0000000075120000-0x00000000758D0000-memory.dmp

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memory/3296-51-0x000000007512E000-0x000000007512F000-memory.dmp

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memory/3296-5-0x00000000055C0000-0x0000000005626000-memory.dmp

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memory/3296-7-0x0000000006810000-0x000000000684C000-memory.dmp

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memory/3296-0-0x000000007512E000-0x000000007512F000-memory.dmp

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memory/3296-4-0x0000000075120000-0x00000000758D0000-memory.dmp

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memory/3296-3-0x0000000005640000-0x00000000056D2000-memory.dmp

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memory/3296-69-0x0000000075120000-0x00000000758D0000-memory.dmp

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memory/3296-2-0x0000000005B00000-0x00000000060A4000-memory.dmp

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memory/3296-1-0x0000000000B60000-0x0000000000BEC000-memory.dmp

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