quasar | 995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824

Analysis

max time kernel
54s
max time network
63s
platform
windows10-2004_x64
resource
win10v2004-20220414-en
submitted
12-05-2022 11:56

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General

Target

995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe
Size

600KB
MD5

38842bfc2ef9e1a4734a3ac4d4fa0b0d
SHA1

d7702f8f8b6d8baa46c066948b8278bfe868cff5
SHA256

995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824
SHA512

067a32950f8800f2ab64d80c6910abf20e0204457abca4156a5a93624c230720b7904fe48ef26ab2ea15958abdb8a53306513c4db74ca69f02de679c5c360346

Score

10^/10

quasar venomrat windows security evasion persistence rat rootkit spyware stealer suricata trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

windows security

vilvaraj-32652.portmap.io:32652

Mutex

VNM_MUTEX_XaCO2YtLAsadylDHBP

Attributes

encryption_key
eKgGUbCubcSIafuOAN5V
install_name
windows security.exe
log_directory
Logs
reconnect_delay
3000
startup_key
windows security
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/5036-135-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def

Modifies Windows Defender Real-time Protection settings 3 TTPs
evasion trojan

Modify Registry
T1112

Modify Existing Service
T1031

Disabling Security Tools
T1089

Quasar Payload 1 IoCs

resource	yara_rule
behavioral2/memory/5036-135-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
VenomRAT
VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.
rat rootkit stealer venomrat
suricata: ET MALWARE W32/Quasar 1.3/Venom RAT Connectivity Check 3
suricata: ET MALWARE W32/Quasar 1.3/Venom RAT Connectivity Check 3
suricata

Executes dropped EXE 2 IoCs

pid	Process
4232	windows security.exe
4340	windows security.exe

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-1-5-21-3751123196-3323558407-1869646069-1000\Control Panel\International\Geo\Nation	windows security.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	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.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-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Windows Services = "C:\\Users\\Admin\\AppData\\Roaming\\Windows Update Folder\\Windows Update.exe"	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\windows security = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\windows security.exe\""	windows security.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
3	ip-api.com
7	api.ipify.org
16	api.ipify.org

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 2736 set thread context of 5036	2736	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	82
PID 4232 set thread context of 4340	4232	windows security.exe	88

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2500	4340	WerFault.exe	88

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
1780	schtasks.exe
2480	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1776	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4452	powershell.exe
4452	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	5036	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe
Token: SeDebugPrivilege	4452	powershell.exe
Token: SeDebugPrivilege	4340	windows security.exe
Token: SeDebugPrivilege	4340	windows security.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4340	windows security.exe

Suspicious use of WriteProcessMemory 37 IoCs

description	pid	Process	procid_target
PID 2736 wrote to memory of 5036	2736	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	82
PID 2736 wrote to memory of 5036	2736	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	82
PID 2736 wrote to memory of 5036	2736	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	82
PID 2736 wrote to memory of 5036	2736	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	82
PID 2736 wrote to memory of 5036	2736	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	82
PID 2736 wrote to memory of 5036	2736	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	82
PID 2736 wrote to memory of 5036	2736	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	82
PID 2736 wrote to memory of 5036	2736	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	82
PID 5036 wrote to memory of 1780	5036	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	83
PID 5036 wrote to memory of 1780	5036	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	83
PID 5036 wrote to memory of 1780	5036	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	83
PID 5036 wrote to memory of 4232	5036	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	85
PID 5036 wrote to memory of 4232	5036	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	85
PID 5036 wrote to memory of 4232	5036	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	85
PID 5036 wrote to memory of 4452	5036	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	86
PID 5036 wrote to memory of 4452	5036	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	86
PID 5036 wrote to memory of 4452	5036	995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe	86
PID 4232 wrote to memory of 4340	4232	windows security.exe	88
PID 4232 wrote to memory of 4340	4232	windows security.exe	88
PID 4232 wrote to memory of 4340	4232	windows security.exe	88
PID 4232 wrote to memory of 4340	4232	windows security.exe	88
PID 4232 wrote to memory of 4340	4232	windows security.exe	88
PID 4232 wrote to memory of 4340	4232	windows security.exe	88
PID 4232 wrote to memory of 4340	4232	windows security.exe	88
PID 4232 wrote to memory of 4340	4232	windows security.exe	88
PID 4340 wrote to memory of 2480	4340	windows security.exe	90
PID 4340 wrote to memory of 2480	4340	windows security.exe	90
PID 4340 wrote to memory of 2480	4340	windows security.exe	90
PID 4340 wrote to memory of 3868	4340	windows security.exe	92
PID 4340 wrote to memory of 3868	4340	windows security.exe	92
PID 4340 wrote to memory of 3868	4340	windows security.exe	92
PID 3868 wrote to memory of 1628	3868	cmd.exe	95
PID 3868 wrote to memory of 1628	3868	cmd.exe	95
PID 3868 wrote to memory of 1628	3868	cmd.exe	95
PID 3868 wrote to memory of 1776	3868	cmd.exe	97
PID 3868 wrote to memory of 1776	3868	cmd.exe	97
PID 3868 wrote to memory of 1776	3868	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe
"C:\Users\Admin\AppData\Local\Temp\995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2736
- C:\Users\Admin\AppData\Local\Temp\995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe
  "C:\Users\Admin\AppData\Local\Temp\995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe"
  2⤵
  - Windows security modification
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:5036
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "windows security" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:1780
- - C:\Users\Admin\AppData\Roaming\SubDir\windows security.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\windows security.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:4232
  - - C:\Users\Admin\AppData\Roaming\SubDir\windows security.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\windows security.exe"
      4⤵
      Executes dropped EXE
      Checks computer location settings
      Adds Run key to start application
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:4340
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "windows security" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\windows security.exe" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:2480
    - - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\GxIBqO0Bjx5t.bat" "
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:3868
      - C:\Windows\SysWOW64\chcp.com
        
        chcp 65001
        6⤵
        
        PID:1628
      - C:\Windows\SysWOW64\PING.EXE
        
        ping -n 10 localhost
        6⤵
        Runs ping.exe
        
        PID:1776
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 4340 -s 2224
        5⤵
        Program crash
        
        PID:2500
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4452

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 4340 -ip 4340
1⤵
PID:3080

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

Remote System Discovery

T1018

System Information Discovery

T1082

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\995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824.exe.log

Filesize
507B

MD5
8cf94b5356be60247d331660005941ec

SHA1
fdedb361f40f22cb6a086c808fc0056d4e421131

SHA256
52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0

SHA512
b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\windows security.exe.log

Filesize
507B

MD5
8cf94b5356be60247d331660005941ec

SHA1
fdedb361f40f22cb6a086c808fc0056d4e421131

SHA256
52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0

SHA512
b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651

Download Submit
C:\Users\Admin\AppData\Local\Temp\GxIBqO0Bjx5t.bat

Filesize
217B

MD5
a143fc184a75653dc3388e9fdb4cd2f4

SHA1
5d8449084f74a31fbdbd734eb145b6760050ff3d

SHA256
8235ca10580b9cd0323cd23e7ae33b4e93334e6315d3402180365ff2d553e7a6

SHA512
8c10b85779e45df9aa5c195b2099a55bb041f91b3c5fc088803e188df19fdd8d4f03f5038f549cb70ba5041adcc6b67fb511b2497141ca3871ce46e6acc25759

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\windows security.exe

Filesize
600KB

MD5
38842bfc2ef9e1a4734a3ac4d4fa0b0d

SHA1
d7702f8f8b6d8baa46c066948b8278bfe868cff5

SHA256
995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824

SHA512
067a32950f8800f2ab64d80c6910abf20e0204457abca4156a5a93624c230720b7904fe48ef26ab2ea15958abdb8a53306513c4db74ca69f02de679c5c360346

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\windows security.exe

Filesize
600KB

MD5
38842bfc2ef9e1a4734a3ac4d4fa0b0d

SHA1
d7702f8f8b6d8baa46c066948b8278bfe868cff5

SHA256
995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824

SHA512
067a32950f8800f2ab64d80c6910abf20e0204457abca4156a5a93624c230720b7904fe48ef26ab2ea15958abdb8a53306513c4db74ca69f02de679c5c360346

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\windows security.exe

Filesize
600KB

MD5
38842bfc2ef9e1a4734a3ac4d4fa0b0d

SHA1
d7702f8f8b6d8baa46c066948b8278bfe868cff5

SHA256
995661538199d5b1f816b33bf4a5b0dc50840e054a14dc54189aa63db3b6b824

SHA512
067a32950f8800f2ab64d80c6910abf20e0204457abca4156a5a93624c230720b7904fe48ef26ab2ea15958abdb8a53306513c4db74ca69f02de679c5c360346

Download Submit
memory/2736-130-0x0000000000780000-0x000000000081C000-memory.dmp

Filesize
624KB

Download
memory/2736-133-0x0000000005340000-0x00000000053DC000-memory.dmp

Filesize
624KB

Download
memory/2736-132-0x00000000052A0000-0x0000000005332000-memory.dmp

Filesize
584KB

Download
memory/2736-131-0x00000000057B0000-0x0000000005D54000-memory.dmp

Filesize
5.6MB

Download
memory/4340-161-0x0000000007400000-0x000000000740A000-memory.dmp

Filesize
40KB

Download
memory/4452-149-0x00000000055E0000-0x0000000005C08000-memory.dmp

Filesize
6.2MB

Download
memory/4452-158-0x0000000007910000-0x000000000791A000-memory.dmp

Filesize
40KB

Download
memory/4452-151-0x0000000005CC0000-0x0000000005D26000-memory.dmp

Filesize
408KB

Download
memory/4452-152-0x00000000065A0000-0x00000000065BE000-memory.dmp

Filesize
120KB

Download
memory/4452-153-0x0000000006B50000-0x0000000006B82000-memory.dmp

Filesize
200KB

Download
memory/4452-154-0x00000000707F0000-0x000000007083C000-memory.dmp

Filesize
304KB

Download
memory/4452-155-0x0000000006B30000-0x0000000006B4E000-memory.dmp

Filesize
120KB

Download
memory/4452-157-0x00000000078A0000-0x00000000078BA000-memory.dmp

Filesize
104KB

Download
memory/4452-156-0x0000000007EE0000-0x000000000855A000-memory.dmp

Filesize
6.5MB

Download
memory/4452-150-0x0000000005540000-0x0000000005562000-memory.dmp

Filesize
136KB

Download
memory/4452-159-0x0000000007B20000-0x0000000007BB6000-memory.dmp

Filesize
600KB

Download
memory/4452-144-0x0000000002BF0000-0x0000000002C26000-memory.dmp

Filesize
216KB

Download
memory/4452-168-0x0000000006990000-0x0000000006998000-memory.dmp

Filesize
32KB

Download
memory/4452-167-0x0000000007B00000-0x0000000007B1A000-memory.dmp

Filesize
104KB

Download
memory/4452-166-0x00000000069C0000-0x00000000069CE000-memory.dmp

Filesize
56KB

Download
memory/5036-135-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/5036-137-0x00000000055F0000-0x0000000005656000-memory.dmp

Filesize
408KB

Download
memory/5036-138-0x0000000005720000-0x0000000005732000-memory.dmp

Filesize
72KB

Download