quasar | af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e

Analysis

max time kernel
187s
max time network
192s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
14-10-2022 05:06

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General

Target

af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe
Size

534KB
MD5

17e6bffaff1ea223913deb1bc78e74ae
SHA1

67daf17f3c8f6d2169b24f9a3698921991bbba2f
SHA256

af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e
SHA512

72086bdd67ce5c778a625d37d7069200747b70193742afee986ec3d58b3a4a5c95b206c91997faf5d3e46e7ab379955db5f033a8b10a4a4899ff6e6068c60ab6
SSDEEP

6144:l8fGABIgrx8kFYLTiMkbMaOcXL/Tb88ASigvCcD+6cfsfiTDpxUKl3Gy3V8/GV0S:EPx7FYPiMNA/flvCcqTsfGpxLl+u

Score

10^/10

quasar venomrat asdf evasion persistence rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

asdf

checkme12.freeddns.org:1604

Mutex

VNM_MUTEX_yidaALoSEROfTPWHwX

Attributes

encryption_key
TbfVFQWqb0uiZoBjJ9E9
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Venom Client Startup
subdirectory
UPX

Signatures

Contains code to disable Windows Defender 3 IoCs

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

Processes:

resource	yara_rule
behavioral1/memory/4780-133-0x00000000007A0000-0x000000000082C000-memory.dmp	disable_win_def
behavioral1/files/0x000300000001e6e8-140.dat	disable_win_def
behavioral1/files/0x000300000001e6e8-141.dat	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

Processes:

af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/4780-133-0x00000000007A0000-0x000000000082C000-memory.dmp	family_quasar
behavioral1/files/0x000300000001e6e8-140.dat	family_quasar
behavioral1/files/0x000300000001e6e8-141.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

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid	Process
724	Client.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

Processes:

af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exeClient.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Venom Client Startup = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe\""	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Venom Client Startup = "\"C:\\Users\\Admin\\AppData\\Roaming\\UPX\\Client.exe\""	Client.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.

Processes:

flow	ioc
12	ip-api.com
26	api.ipify.org
29	ip-api.com

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

Processes:

schtasks.exeschtasks.exe

pid	Process
4380	schtasks.exe
240	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

Processes:

PING.EXE

pid	Process
3688	PING.EXE

Suspicious behavior: EnumeratesProcesses 9 IoCs

Processes:

powershell.exeaf1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe

pid	Process
1860	powershell.exe
1860	powershell.exe
4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe
4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe
4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe
4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe
4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe
4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe
4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exeClient.exepowershell.exe

description	pid	Process
Token: SeDebugPrivilege	4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe
Token: SeDebugPrivilege	724	Client.exe
Token: SeDebugPrivilege	1860	powershell.exe
Token: SeDebugPrivilege	724	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid	Process
724	Client.exe

Suspicious use of WriteProcessMemory 27 IoCs

Processes:

af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exeClient.execmd.execmd.exe

description	pid	Process	procid_target
PID 4780 wrote to memory of 4380	4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe	80
PID 4780 wrote to memory of 4380	4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe	80
PID 4780 wrote to memory of 4380	4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe	80
PID 4780 wrote to memory of 724	4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe	82
PID 4780 wrote to memory of 724	4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe	82
PID 4780 wrote to memory of 724	4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe	82
PID 4780 wrote to memory of 1860	4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe	83
PID 4780 wrote to memory of 1860	4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe	83
PID 4780 wrote to memory of 1860	4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe	83
PID 724 wrote to memory of 240	724	Client.exe	85
PID 724 wrote to memory of 240	724	Client.exe	85
PID 724 wrote to memory of 240	724	Client.exe	85
PID 4780 wrote to memory of 2520	4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe	91
PID 4780 wrote to memory of 2520	4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe	91
PID 4780 wrote to memory of 2520	4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe	91
PID 2520 wrote to memory of 4440	2520	cmd.exe	93
PID 2520 wrote to memory of 4440	2520	cmd.exe	93
PID 2520 wrote to memory of 4440	2520	cmd.exe	93
PID 4780 wrote to memory of 1396	4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe	96
PID 4780 wrote to memory of 1396	4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe	96
PID 4780 wrote to memory of 1396	4780	af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe	96
PID 1396 wrote to memory of 1064	1396	cmd.exe	98
PID 1396 wrote to memory of 1064	1396	cmd.exe	98
PID 1396 wrote to memory of 1064	1396	cmd.exe	98
PID 1396 wrote to memory of 3688	1396	cmd.exe	99
PID 1396 wrote to memory of 3688	1396	cmd.exe	99
PID 1396 wrote to memory of 3688	1396	cmd.exe	99

C:\Users\Admin\AppData\Local\Temp\af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe
"C:\Users\Admin\AppData\Local\Temp\af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe"
1⤵
- Modifies Windows Defender Real-time Protection settings
- 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:4780
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "Venom Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:4380
- C:\Users\Admin\AppData\Roaming\UPX\Client.exe
  "C:\Users\Admin\AppData\Roaming\UPX\Client.exe"
  2⤵
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:724
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Venom Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\UPX\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:240
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell" Get-MpPreference -verbose
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1860
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2520
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
    3⤵
    PID:4440
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\QHnYZc6jKqOB.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1396
- - C:\Windows\SysWOW64\chcp.com
    chcp 65001
    3⤵
    PID:1064
- - C:\Windows\SysWOW64\PING.EXE
    ping -n 10 localhost
    3⤵
    - Runs ping.exe
    PID:3688

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\Temp\QHnYZc6jKqOB.bat

Filesize
261B

MD5
fb355b7622c31c8f5b1144016eba0a02

SHA1
2470451191d443fa27ee6b424111f10ce6ebf88d

SHA256
6998a6d43ed239bbba0405e1ee5120c9ddc644e28c317cc7599bfd4c15183559

SHA512
3d7b012b517e61e83e7f9cf31cfadcaa7d3753790f32ba1b30174437294831b1bd2dee7dd9e45f4d123f43be2c94232ef47baee07372c2170a33cb268c9f8ebb

Download Submit
C:\Users\Admin\AppData\Roaming\UPX\Client.exe

Filesize
534KB

MD5
17e6bffaff1ea223913deb1bc78e74ae

SHA1
67daf17f3c8f6d2169b24f9a3698921991bbba2f

SHA256
af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e

SHA512
72086bdd67ce5c778a625d37d7069200747b70193742afee986ec3d58b3a4a5c95b206c91997faf5d3e46e7ab379955db5f033a8b10a4a4899ff6e6068c60ab6

Download Submit
C:\Users\Admin\AppData\Roaming\UPX\Client.exe

Filesize
534KB

MD5
17e6bffaff1ea223913deb1bc78e74ae

SHA1
67daf17f3c8f6d2169b24f9a3698921991bbba2f

SHA256
af1d446bb3abc47b5eacb7a00ebb1992be1c464cac5b0e4283b12f0500c3ad4e

SHA512
72086bdd67ce5c778a625d37d7069200747b70193742afee986ec3d58b3a4a5c95b206c91997faf5d3e46e7ab379955db5f033a8b10a4a4899ff6e6068c60ab6

Download Submit
memory/240-146-0x0000000000000000-mapping.dmp

Download
memory/724-149-0x0000000006CF0000-0x0000000006CFA000-memory.dmp

Filesize
40KB

Download
memory/724-144-0x0000000006970000-0x00000000069AC000-memory.dmp

Filesize
240KB

Download
memory/724-139-0x0000000000000000-mapping.dmp

Download
memory/1064-165-0x0000000000000000-mapping.dmp

Download
memory/1396-163-0x0000000000000000-mapping.dmp

Download
memory/1860-152-0x000000006FB50000-0x000000006FB9C000-memory.dmp

Filesize
304KB

Download
memory/1860-160-0x0000000007440000-0x0000000007448000-memory.dmp

Filesize
32KB

Download
memory/1860-142-0x0000000000000000-mapping.dmp

Download
memory/1860-145-0x0000000005080000-0x00000000056A8000-memory.dmp

Filesize
6.2MB

Download
memory/1860-143-0x0000000002440000-0x0000000002476000-memory.dmp

Filesize
216KB

Download
memory/1860-147-0x0000000004DB0000-0x0000000004DD2000-memory.dmp

Filesize
136KB

Download
memory/1860-148-0x0000000004ED0000-0x0000000004F36000-memory.dmp

Filesize
408KB

Download
memory/1860-158-0x00000000072E0000-0x00000000072EE000-memory.dmp

Filesize
56KB

Download
memory/1860-150-0x0000000004FE0000-0x0000000004FFE000-memory.dmp

Filesize
120KB

Download
memory/1860-151-0x0000000006210000-0x0000000006242000-memory.dmp

Filesize
200KB

Download
memory/1860-159-0x0000000007450000-0x000000000746A000-memory.dmp

Filesize
104KB

Download
memory/1860-153-0x00000000061D0000-0x00000000061EE000-memory.dmp

Filesize
120KB

Download
memory/1860-154-0x0000000007700000-0x0000000007D7A000-memory.dmp

Filesize
6.5MB

Download
memory/1860-155-0x00000000070A0000-0x00000000070BA000-memory.dmp

Filesize
104KB

Download
memory/1860-156-0x0000000007100000-0x000000000710A000-memory.dmp

Filesize
40KB

Download
memory/1860-157-0x0000000007370000-0x0000000007406000-memory.dmp

Filesize
600KB

Download
memory/2520-161-0x0000000000000000-mapping.dmp

Download
memory/3688-166-0x0000000000000000-mapping.dmp

Download
memory/4380-138-0x0000000000000000-mapping.dmp

Download
memory/4440-162-0x0000000000000000-mapping.dmp

Download
memory/4780-133-0x00000000007A0000-0x000000000082C000-memory.dmp

Filesize
560KB

Download
memory/4780-135-0x00000000052A0000-0x0000000005332000-memory.dmp

Filesize
584KB

Download
memory/4780-136-0x00000000051E0000-0x0000000005246000-memory.dmp

Filesize
408KB

Download
memory/4780-134-0x0000000005850000-0x0000000005DF4000-memory.dmp

Filesize
5.6MB

Download
memory/4780-137-0x0000000006020000-0x0000000006032000-memory.dmp

Filesize
72KB

Download