quasar | 4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

Analysis

max time kernel
154s
max time network
162s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
30-11-2022 18:42

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General

Target

4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe
Size

648KB
MD5

763dd9b7f2a5183a1380bee36889f936
SHA1

cdc7f9911a853973fc83d0e1a51ee5e82da347c9
SHA256

4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039
SHA512

7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c
SSDEEP

12288:Z8iNlD5ZS/1WEJOAqRSEM3Sy21LVbK89elrrJ56:vKIDAEQSy2TbKuKN

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/5020-137-0x0000000000400000-0x000000000048C000-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
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/5020-137-0x0000000000400000-0x000000000048C000-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 2 IoCs

pid	Process
4244	Windows Defender Security.exe
4460	Windows Defender 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-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.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	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Windows Services = "C:\\Users\\Admin\\AppData\\Roaming\\Windows Update Folder\\Windows Update.exe"	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.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
25	ip-api.com

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3996 set thread context of 5020	3996	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	82
PID 4244 set thread context of 4460	4244	Windows Defender 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

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
1924	schtasks.exe
2024	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
4776	powershell.exe
4776	powershell.exe
5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe
5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe
5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe
5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe
5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe
5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe
5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe
Token: SeDebugPrivilege	4776	powershell.exe
Token: SeDebugPrivilege	4460	Windows Defender Security.exe
Token: SeDebugPrivilege	4460	Windows Defender Security.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4460	Windows Defender Security.exe

Suspicious use of WriteProcessMemory 37 IoCs

description	pid	Process	procid_target
PID 3996 wrote to memory of 5020	3996	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	82
PID 3996 wrote to memory of 5020	3996	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	82
PID 3996 wrote to memory of 5020	3996	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	82
PID 3996 wrote to memory of 5020	3996	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	82
PID 3996 wrote to memory of 5020	3996	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	82
PID 3996 wrote to memory of 5020	3996	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	82
PID 3996 wrote to memory of 5020	3996	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	82
PID 3996 wrote to memory of 5020	3996	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	82
PID 5020 wrote to memory of 1924	5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	83
PID 5020 wrote to memory of 1924	5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	83
PID 5020 wrote to memory of 1924	5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	83
PID 5020 wrote to memory of 4244	5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	85
PID 5020 wrote to memory of 4244	5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	85
PID 5020 wrote to memory of 4244	5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	85
PID 5020 wrote to memory of 4776	5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	86
PID 5020 wrote to memory of 4776	5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	86
PID 5020 wrote to memory of 4776	5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	86
PID 4244 wrote to memory of 4460	4244	Windows Defender Security.exe	88
PID 4244 wrote to memory of 4460	4244	Windows Defender Security.exe	88
PID 4244 wrote to memory of 4460	4244	Windows Defender Security.exe	88
PID 4244 wrote to memory of 4460	4244	Windows Defender Security.exe	88
PID 4244 wrote to memory of 4460	4244	Windows Defender Security.exe	88
PID 4244 wrote to memory of 4460	4244	Windows Defender Security.exe	88
PID 4244 wrote to memory of 4460	4244	Windows Defender Security.exe	88
PID 4244 wrote to memory of 4460	4244	Windows Defender Security.exe	88
PID 4460 wrote to memory of 2024	4460	Windows Defender Security.exe	89
PID 4460 wrote to memory of 2024	4460	Windows Defender Security.exe	89
PID 4460 wrote to memory of 2024	4460	Windows Defender Security.exe	89
PID 5020 wrote to memory of 4572	5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	91
PID 5020 wrote to memory of 4572	5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	91
PID 5020 wrote to memory of 4572	5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	91
PID 4572 wrote to memory of 3952	4572	cmd.exe	93
PID 4572 wrote to memory of 3952	4572	cmd.exe	93
PID 4572 wrote to memory of 3952	4572	cmd.exe	93
PID 5020 wrote to memory of 2384	5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	95
PID 5020 wrote to memory of 2384	5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	95
PID 5020 wrote to memory of 2384	5020	4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe	95

C:\Users\Admin\AppData\Local\Temp\4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe
"C:\Users\Admin\AppData\Local\Temp\4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3996
- C:\Users\Admin\AppData\Local\Temp\4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe
  "C:\Users\Admin\AppData\Local\Temp\4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe"
  2⤵
  - Modifies Windows Defender Real-time Protection settings
  - Checks computer location settings
  - Windows security modification
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:5020
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:1924
- - C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:4244
  - - 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 AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:4460
    - - 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
        5⤵
        Creates scheduled task(s)
        
        PID:2024
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4776
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4572
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
      4⤵
      PID:3952
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\HKP7gLUvolmk.bat" "
    3⤵
    PID:2384

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039.exe.log

Filesize
507B

MD5
8cf94b5356be60247d331660005941ec

SHA1
fdedb361f40f22cb6a086c808fc0056d4e421131

SHA256
52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0

SHA512
b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651

Download Submit
C:\Users\Admin\AppData\Local\Temp\HKP7gLUvolmk.bat

Filesize
261B

MD5
f01ee872fb37222826c659f13b52ba66

SHA1
94ff5a1114369a8b8a289a5da76b56749c4a396e

SHA256
31acbbbd4e2aec545d0189ed8af81316f7c772ec8e8881270d90c4dda9300d85

SHA512
f2a00b3802f96750d84c958d605c4cdef520a209f5db76a9904e24a6079a4bf99df1a1a9d2df399418427c9768f448ce442b63bf2d8c6f5fc0b68f40b3f49bc7

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe

Filesize
648KB

MD5
763dd9b7f2a5183a1380bee36889f936

SHA1
cdc7f9911a853973fc83d0e1a51ee5e82da347c9

SHA256
4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

SHA512
7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe

Filesize
648KB

MD5
763dd9b7f2a5183a1380bee36889f936

SHA1
cdc7f9911a853973fc83d0e1a51ee5e82da347c9

SHA256
4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

SHA512
7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe

Filesize
648KB

MD5
763dd9b7f2a5183a1380bee36889f936

SHA1
cdc7f9911a853973fc83d0e1a51ee5e82da347c9

SHA256
4be9a02e54e86920ed2bcaef3d28253ad0f4f3b005a14c656d74966589ca2039

SHA512
7ce621d758a7e12d026d669a5a9827e4dbec130baf05c51e8937227b9f35f5ef7ecfc4e60202f1e3d2f7aa67d665f612bfa0db92cd1ec3d2420a8207b152e37c

Download Submit
memory/3996-134-0x00000000056A0000-0x0000000005732000-memory.dmp

Filesize
584KB

Download
memory/3996-135-0x0000000005740000-0x00000000057DC000-memory.dmp

Filesize
624KB

Download
memory/3996-133-0x0000000005C50000-0x00000000061F4000-memory.dmp

Filesize
5.6MB

Download
memory/3996-132-0x0000000000BA0000-0x0000000000C48000-memory.dmp

Filesize
672KB

Download
memory/4460-155-0x0000000006780000-0x000000000678A000-memory.dmp

Filesize
40KB

Download
memory/4776-151-0x00000000058E0000-0x0000000005902000-memory.dmp

Filesize
136KB

Download
memory/4776-161-0x0000000007C30000-0x0000000007C3A000-memory.dmp

Filesize
40KB

Download
memory/4776-152-0x0000000005980000-0x00000000059E6000-memory.dmp

Filesize
408KB

Download
memory/4776-153-0x00000000068B0000-0x00000000068CE000-memory.dmp

Filesize
120KB

Download
memory/4776-149-0x0000000002FA0000-0x0000000002FD6000-memory.dmp

Filesize
216KB

Download
memory/4776-156-0x0000000006E70000-0x0000000006EA2000-memory.dmp

Filesize
200KB

Download
memory/4776-157-0x000000006FCE0000-0x000000006FD2C000-memory.dmp

Filesize
304KB

Download
memory/4776-158-0x0000000006EB0000-0x0000000006ECE000-memory.dmp

Filesize
120KB

Download
memory/4776-159-0x0000000008200000-0x000000000887A000-memory.dmp

Filesize
6.5MB

Download
memory/4776-160-0x0000000007BC0000-0x0000000007BDA000-memory.dmp

Filesize
104KB

Download
memory/4776-150-0x0000000005BE0000-0x0000000006208000-memory.dmp

Filesize
6.2MB

Download
memory/4776-162-0x0000000007E40000-0x0000000007ED6000-memory.dmp

Filesize
600KB

Download
memory/4776-163-0x0000000007DF0000-0x0000000007DFE000-memory.dmp

Filesize
56KB

Download
memory/4776-164-0x0000000007F00000-0x0000000007F1A000-memory.dmp

Filesize
104KB

Download
memory/4776-165-0x0000000007EE0000-0x0000000007EE8000-memory.dmp

Filesize
32KB

Download
memory/5020-140-0x0000000006160000-0x000000000619C000-memory.dmp

Filesize
240KB

Download
memory/5020-139-0x0000000005BF0000-0x0000000005C02000-memory.dmp

Filesize
72KB

Download
memory/5020-138-0x0000000005010000-0x0000000005076000-memory.dmp

Filesize
408KB

Download
memory/5020-137-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download