quasar | 94dc30c7b03813bb558ec30577f0761dc2bfcedd3aa0dea665a88ab84f08aa33

Analysis

max time kernel
169s
max time network
178s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
30/11/2022, 14:28

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General

Target
94dc30c7b03813bb558ec30577f0761dc2bfcedd3aa0dea665a88ab84f08aa33.exe
Size 680KB
Sample221130-rtfd3shb26
SHA256 94dc30c7b03813bb558ec30577f0761dc2bfcedd3aa0dea665a88ab84f08aa33
MD5 4f99850bfde0c6703b4f2c8420b9dc8f
SHA1 c60d92f1e0529b2e770858e180906bf9fae631a9
SHA512 0d311592bc2dc5ececb3afae6dee5842b9f6a37710d29f5f1a3fe8a27d3e43a625a57039bef92044744d8a0225c52260cc9757b148deb9e0c4e72781e1a89aec
SSDEEP 12288:75393whFOBbQVXQsI6f9fqAPzzEeEZchCBywRiaxJDj8DkIonQmP0Ove/diuHc:753uhF7VAibzzEe9wRiaLSkI8QhOQ18
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar venomrat ajith evasion persistence rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

ajith

23.105.131.178:7812

Mutex

VNM_MUTEX_NdVd2sPSSqFdo7I35g

Attributes

encryption_key
jyerms3KOWmt3C9DBFuq
install_name
Windows Defender Security.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Update
subdirectory
SubDir

Signatures

Contains code to disable Windows Defender 1 IoCs

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

resource	yara_rule
behavioral2/memory/1868-144-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def

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

evasion trojan

Modify Registry

T1112

Modify Existing Service

T1031

Disabling Security Tools

T1089

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

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/1868-144-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar

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

Executes dropped EXE 8 IoCs

pid	Process
2696	Windows Security.exe_protected.exe
4576	Windows Security.exe_protected.exe
4276	Windows Security.exe_protected.exe
1868	Windows Security.exe_protected.exe
1812	Windows Defender Security.exe
2360	Windows Defender Security.exe
1892	Windows Defender Security.exe
1300	Windows Defender Security.exe

Checks computer location settings 2 TTPs 2 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-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	94dc30c7b03813bb558ec30577f0761dc2bfcedd3aa0dea665a88ab84f08aa33.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	Windows Security.exe_protected.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

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

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Windows Services = "C:\\Users\\Admin\\AppData\\Roaming\\Windows Update Folder\\Windows Update.exe"	Windows Security.exe_protected.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Update = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\7ZipSfx.000\\Windows Security.exe_protected.exe\""	Windows Security.exe_protected.exe

Looks up external IP address via web service 3 IoCs

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

flow	ioc
45	ip-api.com
71	api.ipify.org
78	ip-api.com

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2696 set thread context of 1868	2696	Windows Security.exe_protected.exe	89
PID 1812 set thread context of 1300	1812	Windows Defender Security.exe	100

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
3244	schtasks.exe
2132	schtasks.exe

Suspicious behavior: EnumeratesProcesses 17 IoCs

pid	Process
2696	Windows Security.exe_protected.exe
2696	Windows Security.exe_protected.exe
2696	Windows Security.exe_protected.exe
2696	Windows Security.exe_protected.exe
1812	Windows Defender Security.exe
1812	Windows Defender Security.exe
1812	Windows Defender Security.exe
1812	Windows Defender Security.exe
2208	powershell.exe
2208	powershell.exe
1868	Windows Security.exe_protected.exe
1868	Windows Security.exe_protected.exe
1868	Windows Security.exe_protected.exe
1868	Windows Security.exe_protected.exe
1868	Windows Security.exe_protected.exe
1868	Windows Security.exe_protected.exe
1868	Windows Security.exe_protected.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	2696	Windows Security.exe_protected.exe
Token: SeDebugPrivilege	1868	Windows Security.exe_protected.exe
Token: SeDebugPrivilege	1812	Windows Defender Security.exe
Token: SeDebugPrivilege	2208	powershell.exe
Token: SeDebugPrivilege	1300	Windows Defender Security.exe
Token: SeDebugPrivilege	1300	Windows Defender Security.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1300	Windows Defender Security.exe

Suspicious use of WriteProcessMemory 55 IoCs

description	pid	Process	procid_target
PID 4296 wrote to memory of 2696	4296	94dc30c7b03813bb558ec30577f0761dc2bfcedd3aa0dea665a88ab84f08aa33.exe	84
PID 4296 wrote to memory of 2696	4296	94dc30c7b03813bb558ec30577f0761dc2bfcedd3aa0dea665a88ab84f08aa33.exe	84
PID 4296 wrote to memory of 2696	4296	94dc30c7b03813bb558ec30577f0761dc2bfcedd3aa0dea665a88ab84f08aa33.exe	84
PID 2696 wrote to memory of 4576	2696	Windows Security.exe_protected.exe	87
PID 2696 wrote to memory of 4576	2696	Windows Security.exe_protected.exe	87
PID 2696 wrote to memory of 4576	2696	Windows Security.exe_protected.exe	87
PID 2696 wrote to memory of 4276	2696	Windows Security.exe_protected.exe	88
PID 2696 wrote to memory of 4276	2696	Windows Security.exe_protected.exe	88
PID 2696 wrote to memory of 4276	2696	Windows Security.exe_protected.exe	88
PID 2696 wrote to memory of 1868	2696	Windows Security.exe_protected.exe	89
PID 2696 wrote to memory of 1868	2696	Windows Security.exe_protected.exe	89
PID 2696 wrote to memory of 1868	2696	Windows Security.exe_protected.exe	89
PID 2696 wrote to memory of 1868	2696	Windows Security.exe_protected.exe	89
PID 2696 wrote to memory of 1868	2696	Windows Security.exe_protected.exe	89
PID 2696 wrote to memory of 1868	2696	Windows Security.exe_protected.exe	89
PID 2696 wrote to memory of 1868	2696	Windows Security.exe_protected.exe	89
PID 2696 wrote to memory of 1868	2696	Windows Security.exe_protected.exe	89
PID 1868 wrote to memory of 3244	1868	Windows Security.exe_protected.exe	92
PID 1868 wrote to memory of 3244	1868	Windows Security.exe_protected.exe	92
PID 1868 wrote to memory of 3244	1868	Windows Security.exe_protected.exe	92
PID 1868 wrote to memory of 1812	1868	Windows Security.exe_protected.exe	95
PID 1868 wrote to memory of 1812	1868	Windows Security.exe_protected.exe	95
PID 1868 wrote to memory of 1812	1868	Windows Security.exe_protected.exe	95
PID 1868 wrote to memory of 2208	1868	Windows Security.exe_protected.exe	96
PID 1868 wrote to memory of 2208	1868	Windows Security.exe_protected.exe	96
PID 1868 wrote to memory of 2208	1868	Windows Security.exe_protected.exe	96
PID 1812 wrote to memory of 2360	1812	Windows Defender Security.exe	98
PID 1812 wrote to memory of 2360	1812	Windows Defender Security.exe	98
PID 1812 wrote to memory of 2360	1812	Windows Defender Security.exe	98
PID 1812 wrote to memory of 1892	1812	Windows Defender Security.exe	99
PID 1812 wrote to memory of 1892	1812	Windows Defender Security.exe	99
PID 1812 wrote to memory of 1892	1812	Windows Defender Security.exe	99
PID 1812 wrote to memory of 1300	1812	Windows Defender Security.exe	100
PID 1812 wrote to memory of 1300	1812	Windows Defender Security.exe	100
PID 1812 wrote to memory of 1300	1812	Windows Defender Security.exe	100
PID 1812 wrote to memory of 1300	1812	Windows Defender Security.exe	100
PID 1812 wrote to memory of 1300	1812	Windows Defender Security.exe	100
PID 1812 wrote to memory of 1300	1812	Windows Defender Security.exe	100
PID 1812 wrote to memory of 1300	1812	Windows Defender Security.exe	100
PID 1812 wrote to memory of 1300	1812	Windows Defender Security.exe	100
PID 1300 wrote to memory of 2132	1300	Windows Defender Security.exe	101
PID 1300 wrote to memory of 2132	1300	Windows Defender Security.exe	101
PID 1300 wrote to memory of 2132	1300	Windows Defender Security.exe	101
PID 1868 wrote to memory of 3624	1868	Windows Security.exe_protected.exe	113
PID 1868 wrote to memory of 3624	1868	Windows Security.exe_protected.exe	113
PID 1868 wrote to memory of 3624	1868	Windows Security.exe_protected.exe	113
PID 3624 wrote to memory of 2572	3624	cmd.exe	115
PID 3624 wrote to memory of 2572	3624	cmd.exe	115
PID 3624 wrote to memory of 2572	3624	cmd.exe	115
PID 1868 wrote to memory of 3740	1868	Windows Security.exe_protected.exe	116
PID 1868 wrote to memory of 3740	1868	Windows Security.exe_protected.exe	116
PID 1868 wrote to memory of 3740	1868	Windows Security.exe_protected.exe	116
PID 3740 wrote to memory of 1832	3740	cmd.exe	118
PID 3740 wrote to memory of 1832	3740	cmd.exe	118
PID 3740 wrote to memory of 1832	3740	cmd.exe	118

C:\Users\Admin\AppData\Local\Temp\94dc30c7b03813bb558ec30577f0761dc2bfcedd3aa0dea665a88ab84f08aa33.exe
"C:\Users\Admin\AppData\Local\Temp\94dc30c7b03813bb558ec30577f0761dc2bfcedd3aa0dea665a88ab84f08aa33.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4296
- C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
  "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2696
- - C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
    "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe"
    3⤵
    - Executes dropped EXE
    PID:4576
- - C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
    "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe"
    3⤵
    - Executes dropped EXE
    PID:4276
- - C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe
    "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe"
    3⤵
    - Modifies Windows Defender Real-time Protection settings
    - Executes dropped EXE
    - Checks computer location settings
    - Windows security modification
    - Adds Run key to start application
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1868
  - - C:\Windows\SysWOW64\schtasks.exe
      "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Windows Security.exe_protected.exe" /rl HIGHEST /f
      4⤵
      Creates scheduled task(s)
      PID:3244
  - - C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of SetThreadContext
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1812
    - - C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
        
        "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
        5⤵
        Executes dropped EXE
        
        PID:2360
    - - C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
        
        "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
        5⤵
        Executes dropped EXE
        
        PID:1892
    - - C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
        
        "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
        5⤵
        Executes dropped EXE
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of SetWindowsHookEx
        Suspicious use of WriteProcessMemory
        
        PID:1300
      - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe" /rl HIGHEST /f
        6⤵
        Creates scheduled task(s)
        
        PID:2132
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "powershell" Get-MpPreference -verbose
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2208
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3624
    - - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
        5⤵
        
        PID:2572
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\ERrRCqTbkeRT.bat" "
      4⤵
      Suspicious use of WriteProcessMemory
      PID:3740
    - - C:\Windows\SysWOW64\chcp.com
        
        chcp 65001
        5⤵
        
        PID:1832

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Disabling Security Tools

T1089

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Windows Defender Security.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Windows Defender Security.exe.log
Size 507B
SHA256 52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0
MD5 8cf94b5356be60247d331660005941ec
SHA1 fdedb361f40f22cb6a086c808fc0056d4e421131
SHA512 b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651
MD5 SHA1 SHA512

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Windows Security.exe_protected.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Windows Security.exe_protected.exe.log
Size 507B
SHA256 52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0
MD5 8cf94b5356be60247d331660005941ec
SHA1 fdedb361f40f22cb6a086c808fc0056d4e421131
SHA512 b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651
MD5 SHA1 SHA512

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