quasar | c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648

Analysis

max time kernel
68s
max time network
100s
platform
windows10-2004_x64
resource
win10v2004-20220414-en
submitted
08-05-2022 17:36

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General

Target

c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe
Size

617KB
MD5

7ca7553bd7447c208b5ef00e7374cb44
SHA1

2718e5d21d8f12748f8353cd5574554c654f82a0
SHA256

c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648
SHA512

472b6931e9e712b7c8f045efa99b5a4fd23e3aa14dab256a6690850e711f3263d27c85c6df222ab72f2f4ab120986080e96e1bca2b1d4e5c52a29dc26eaecb1c

Score

10^/10

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

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Windows Defender Security Host

vilvaraj-32652.portmap.io:32652

Mutex

VNM_MUTEX_s1ArJSYbui8dt0HUpJ

Attributes

encryption_key
8gl4TCjsLQUmqCIxalku
install_name
Windows Defender Security Host.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Defender Security Host
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/3576-135-0x0000000000400000-0x000000000048C000-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/3576-135-0x0000000000400000-0x000000000048C000-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 Common RAT Connectivity Check Observed
suricata: ET MALWARE Common RAT Connectivity Check Observed
suricata

Executes dropped EXE 2 IoCs

pid	Process
5008	Windows Defender Security Host.exe
4604	Windows Defender Security Host.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-1-5-21-1809750270-3141839489-3074374771-1000\Control Panel\International\Geo\Nation	Windows Defender Security Host.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	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe

Adds Run key to start application 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1809750270-3141839489-3074374771-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\zHRMiXKHpW = "C:\\Users\\Admin\\AppData\\Roaming\\LbFPJdQtDA\\ZmFSAqsNCM.exe"	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1809750270-3141839489-3074374771-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Defender Security Host = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe\""	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1809750270-3141839489-3074374771-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Defender Security Host = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Windows Defender Security Host.exe\""	Windows Defender Security Host.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
38	ip-api.com

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 1468 set thread context of 3576	1468	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	85
PID 5008 set thread context of 4604	5008	Windows Defender Security Host.exe	100

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
2240	4604	WerFault.exe	100

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
2280	schtasks.exe
1504	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2148	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2560	powershell.exe
2560	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	3576	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe
Token: SeDebugPrivilege	2560	powershell.exe
Token: SeDebugPrivilege	4604	Windows Defender Security Host.exe
Token: SeDebugPrivilege	4604	Windows Defender Security Host.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4604	Windows Defender Security Host.exe

Suspicious use of WriteProcessMemory 37 IoCs

description	pid	Process	procid_target
PID 1468 wrote to memory of 3576	1468	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	85
PID 1468 wrote to memory of 3576	1468	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	85
PID 1468 wrote to memory of 3576	1468	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	85
PID 1468 wrote to memory of 3576	1468	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	85
PID 1468 wrote to memory of 3576	1468	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	85
PID 1468 wrote to memory of 3576	1468	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	85
PID 1468 wrote to memory of 3576	1468	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	85
PID 1468 wrote to memory of 3576	1468	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	85
PID 3576 wrote to memory of 2280	3576	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	94
PID 3576 wrote to memory of 2280	3576	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	94
PID 3576 wrote to memory of 2280	3576	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	94
PID 3576 wrote to memory of 5008	3576	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	97
PID 3576 wrote to memory of 5008	3576	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	97
PID 3576 wrote to memory of 5008	3576	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	97
PID 3576 wrote to memory of 2560	3576	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	98
PID 3576 wrote to memory of 2560	3576	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	98
PID 3576 wrote to memory of 2560	3576	c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe	98
PID 5008 wrote to memory of 4604	5008	Windows Defender Security Host.exe	100
PID 5008 wrote to memory of 4604	5008	Windows Defender Security Host.exe	100
PID 5008 wrote to memory of 4604	5008	Windows Defender Security Host.exe	100
PID 5008 wrote to memory of 4604	5008	Windows Defender Security Host.exe	100
PID 5008 wrote to memory of 4604	5008	Windows Defender Security Host.exe	100
PID 5008 wrote to memory of 4604	5008	Windows Defender Security Host.exe	100
PID 5008 wrote to memory of 4604	5008	Windows Defender Security Host.exe	100
PID 5008 wrote to memory of 4604	5008	Windows Defender Security Host.exe	100
PID 4604 wrote to memory of 1504	4604	Windows Defender Security Host.exe	103
PID 4604 wrote to memory of 1504	4604	Windows Defender Security Host.exe	103
PID 4604 wrote to memory of 1504	4604	Windows Defender Security Host.exe	103
PID 4604 wrote to memory of 3604	4604	Windows Defender Security Host.exe	106
PID 4604 wrote to memory of 3604	4604	Windows Defender Security Host.exe	106
PID 4604 wrote to memory of 3604	4604	Windows Defender Security Host.exe	106
PID 3604 wrote to memory of 3312	3604	cmd.exe	108
PID 3604 wrote to memory of 3312	3604	cmd.exe	108
PID 3604 wrote to memory of 3312	3604	cmd.exe	108
PID 3604 wrote to memory of 2148	3604	cmd.exe	110
PID 3604 wrote to memory of 2148	3604	cmd.exe	110
PID 3604 wrote to memory of 2148	3604	cmd.exe	110

C:\Users\Admin\AppData\Local\Temp\c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe
"C:\Users\Admin\AppData\Local\Temp\c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1468
- C:\Users\Admin\AppData\Local\Temp\c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe
  "C:\Users\Admin\AppData\Local\Temp\c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe"
  2⤵
  - Windows security modification
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3576
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows Defender Security Host" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2280
- - C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security Host.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security Host.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:5008
  - - C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security Host.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security Host.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:4604
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "Windows Defender Security Host" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security Host.exe" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:1504
    - - C:\Windows\SysWOW64\cmd.exe
        
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\KYy0xuDJaWKm.bat" "
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:3604
      - C:\Windows\SysWOW64\chcp.com
        
        chcp 65001
        6⤵
        
        PID:3312
      - C:\Windows\SysWOW64\PING.EXE
        
        ping -n 10 localhost
        6⤵
        Runs ping.exe
        
        PID:2148
    - - C:\Windows\SysWOW64\WerFault.exe
        
        C:\Windows\SysWOW64\WerFault.exe -u -p 4604 -s 1980
        5⤵
        Program crash
        
        PID:2240
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2560

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4604 -ip 4604
1⤵
PID:5024

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

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Windows Defender Security Host.exe.log

Filesize
507B

MD5
76ffb2f33cb32ade8fc862a67599e9d8

SHA1
920cc4ab75b36d2f9f6e979b74db568973c49130

SHA256
f1a3724670e3379318ec9c73f6f39058cab0ab013ba3cd90c047c3d701362310

SHA512
f33502c2e1bb30c05359bfc6819ca934642a1e01874e3060349127d792694d56ad22fccd6c9477b8ee50d66db35785779324273f509576b48b7f85577e001b4e

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648.exe.log

Filesize
507B

MD5
76ffb2f33cb32ade8fc862a67599e9d8

SHA1
920cc4ab75b36d2f9f6e979b74db568973c49130

SHA256
f1a3724670e3379318ec9c73f6f39058cab0ab013ba3cd90c047c3d701362310

SHA512
f33502c2e1bb30c05359bfc6819ca934642a1e01874e3060349127d792694d56ad22fccd6c9477b8ee50d66db35785779324273f509576b48b7f85577e001b4e

Download Submit
C:\Users\Admin\AppData\Local\Temp\KYy0xuDJaWKm.bat

Filesize
231B

MD5
59679caf3413d97d4900896af82244e2

SHA1
3d106fd60329b509b47c224b9492a1744e78b74f

SHA256
79c451278795d398209acdd6c05410282482c8b49bd604ed2f07cbadd797f3e1

SHA512
bd040d36baf1e75c75f3041b14d1178029a92c1a082151ed3fe7df2cc696d06fd6fd0f46e002f4d8b6e20f1049dbf45524e119ee2c1e3eaa234a80cb4f3b0c96

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

Filesize
617KB

MD5
7ca7553bd7447c208b5ef00e7374cb44

SHA1
2718e5d21d8f12748f8353cd5574554c654f82a0

SHA256
c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648

SHA512
472b6931e9e712b7c8f045efa99b5a4fd23e3aa14dab256a6690850e711f3263d27c85c6df222ab72f2f4ab120986080e96e1bca2b1d4e5c52a29dc26eaecb1c

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

Filesize
617KB

MD5
7ca7553bd7447c208b5ef00e7374cb44

SHA1
2718e5d21d8f12748f8353cd5574554c654f82a0

SHA256
c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648

SHA512
472b6931e9e712b7c8f045efa99b5a4fd23e3aa14dab256a6690850e711f3263d27c85c6df222ab72f2f4ab120986080e96e1bca2b1d4e5c52a29dc26eaecb1c

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

Filesize
617KB

MD5
7ca7553bd7447c208b5ef00e7374cb44

SHA1
2718e5d21d8f12748f8353cd5574554c654f82a0

SHA256
c3fc5c1cd66f7e367cd4194310500aead7341c0154e61111bd1031e262de5648

SHA512
472b6931e9e712b7c8f045efa99b5a4fd23e3aa14dab256a6690850e711f3263d27c85c6df222ab72f2f4ab120986080e96e1bca2b1d4e5c52a29dc26eaecb1c

Download Submit
memory/1468-132-0x00000000058D0000-0x0000000005962000-memory.dmp

Filesize
584KB

Download
memory/1468-133-0x0000000005970000-0x0000000005A0C000-memory.dmp

Filesize
624KB

Download
memory/1468-130-0x0000000000D60000-0x0000000000E02000-memory.dmp

Filesize
648KB

Download
memory/1468-131-0x0000000005DE0000-0x0000000006384000-memory.dmp

Filesize
5.6MB

Download
memory/2560-158-0x0000000006240000-0x000000000625E000-memory.dmp

Filesize
120KB

Download
memory/2560-151-0x0000000005530000-0x0000000005552000-memory.dmp

Filesize
136KB

Download
memory/2560-167-0x0000000007300000-0x000000000730E000-memory.dmp

Filesize
56KB

Download
memory/2560-166-0x0000000007340000-0x00000000073D6000-memory.dmp

Filesize
600KB

Download
memory/2560-165-0x0000000007140000-0x000000000714A000-memory.dmp

Filesize
40KB

Download
memory/2560-149-0x0000000004820000-0x0000000004856000-memory.dmp

Filesize
216KB

Download
memory/2560-150-0x0000000004E90000-0x00000000054B8000-memory.dmp

Filesize
6.2MB

Download
memory/2560-152-0x0000000005690000-0x00000000056F6000-memory.dmp

Filesize
408KB

Download
memory/2560-153-0x0000000005DA0000-0x0000000005DBE000-memory.dmp

Filesize
120KB

Download
memory/2560-163-0x00000000070C0000-0x00000000070DA000-memory.dmp

Filesize
104KB

Download
memory/2560-162-0x0000000007700000-0x0000000007D7A000-memory.dmp

Filesize
6.5MB

Download
memory/2560-156-0x0000000006270000-0x00000000062A2000-memory.dmp

Filesize
200KB

Download
memory/2560-157-0x000000006FDA0000-0x000000006FDEC000-memory.dmp

Filesize
304KB

Download
memory/3576-135-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/3576-137-0x0000000005A30000-0x0000000005A96000-memory.dmp

Filesize
408KB

Download
memory/3576-138-0x0000000005700000-0x0000000005712000-memory.dmp

Filesize
72KB

Download
memory/3576-139-0x0000000006B60000-0x0000000006B9C000-memory.dmp

Filesize
240KB

Download
memory/4604-155-0x0000000006E70000-0x0000000006E7A000-memory.dmp

Filesize
40KB

Download