quasar | 8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e

Analysis

max time kernel
182s
max time network
185s
platform
windows10-2004_x64
resource
win10v2004-en-20220113
submitted
20/03/2022, 02:29

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target
8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe
Size 783KB
Sample220320-cyv8rsfcam
SHA256 8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e
MD5 d677b73dcb14c399d5c986a6558356df
SHA1 7b52f0235c834943078af0292636b335cd86e103
SHA512 e00f0116fa1297dcf20b55c85c521af3cd8b66daa629ba475fd01173ceb1df66cf6c1ae1f2807b8c098d560afa073f23a84260b980c93df3ed173d4d81271126
MD5 SHA1 SHA512

Score

10^/10

quasar venomrat office04 evasion persistence rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office04

193.161.193.99:29069

Mutex

VNM_MUTEX_04STdugX9pbf1yeEFR

Attributes

encryption_key
gOa6B7rJfhbU1IIsLE4i
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows LoginUI
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/4128-141-0x0000000000400000-0x000000000049A000-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/4128-141-0x0000000000400000-0x000000000049A000-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

Executes dropped EXE 2 IoCs

pid	Process
2800	Client.exe
4632	Client.exe

Checks computer location settings 2 TTPs 3 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-1-5-21-1346565761-3498240568-4147300184-1000\Control Panel\International\Geo\Nation	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\Control Panel\International\Geo\Nation	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\Control Panel\International\Geo\Nation	Client.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	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.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-1-5-21-1346565761-3498240568-4147300184-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows LoginUI = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\""	Client.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 4132 set thread context of 4128	4132	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	93
PID 2800 set thread context of 4632	2800	Client.exe	110

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 4 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
5080	schtasks.exe
2068	schtasks.exe
2084	schtasks.exe
1656	schtasks.exe

Modifies data under HKEY_USERS 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-19\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections	svchost.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1060	PING.EXE

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
3092	powershell.exe
3092	powershell.exe
4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe
4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe
4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe
4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe
4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe
4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe
4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe
2800	Client.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	4132	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe
Token: SeDebugPrivilege	4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe
Token: SeDebugPrivilege	3092	powershell.exe
Token: SeDebugPrivilege	2800	Client.exe
Token: SeDebugPrivilege	4632	Client.exe
Token: SeDebugPrivilege	4632	Client.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4632	Client.exe

Suspicious use of WriteProcessMemory 52 IoCs

description	pid	Process	procid_target
PID 4132 wrote to memory of 5080	4132	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	91
PID 4132 wrote to memory of 5080	4132	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	91
PID 4132 wrote to memory of 5080	4132	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	91
PID 4132 wrote to memory of 4128	4132	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	93
PID 4132 wrote to memory of 4128	4132	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	93
PID 4132 wrote to memory of 4128	4132	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	93
PID 4132 wrote to memory of 4128	4132	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	93
PID 4132 wrote to memory of 4128	4132	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	93
PID 4132 wrote to memory of 4128	4132	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	93
PID 4132 wrote to memory of 4128	4132	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	93
PID 4132 wrote to memory of 4128	4132	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	93
PID 4128 wrote to memory of 2068	4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	96
PID 4128 wrote to memory of 2068	4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	96
PID 4128 wrote to memory of 2068	4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	96
PID 4128 wrote to memory of 2800	4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	98
PID 4128 wrote to memory of 2800	4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	98
PID 4128 wrote to memory of 2800	4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	98
PID 4128 wrote to memory of 3092	4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	99
PID 4128 wrote to memory of 3092	4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	99
PID 4128 wrote to memory of 3092	4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	99
PID 4128 wrote to memory of 3692	4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	101
PID 4128 wrote to memory of 3692	4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	101
PID 4128 wrote to memory of 3692	4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	101
PID 3692 wrote to memory of 1720	3692	cmd.exe	103
PID 3692 wrote to memory of 1720	3692	cmd.exe	103
PID 3692 wrote to memory of 1720	3692	cmd.exe	103
PID 4128 wrote to memory of 800	4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	104
PID 4128 wrote to memory of 800	4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	104
PID 4128 wrote to memory of 800	4128	8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe	104
PID 800 wrote to memory of 1452	800	cmd.exe	106
PID 800 wrote to memory of 1452	800	cmd.exe	106
PID 800 wrote to memory of 1452	800	cmd.exe	106
PID 800 wrote to memory of 1060	800	cmd.exe	107
PID 800 wrote to memory of 1060	800	cmd.exe	107
PID 800 wrote to memory of 1060	800	cmd.exe	107
PID 2800 wrote to memory of 2084	2800	Client.exe	108
PID 2800 wrote to memory of 2084	2800	Client.exe	108
PID 2800 wrote to memory of 2084	2800	Client.exe	108
PID 2800 wrote to memory of 4632	2800	Client.exe	110
PID 2800 wrote to memory of 4632	2800	Client.exe	110
PID 2800 wrote to memory of 4632	2800	Client.exe	110
PID 2800 wrote to memory of 4632	2800	Client.exe	110
PID 2800 wrote to memory of 4632	2800	Client.exe	110
PID 2800 wrote to memory of 4632	2800	Client.exe	110
PID 2800 wrote to memory of 4632	2800	Client.exe	110
PID 2800 wrote to memory of 4632	2800	Client.exe	110
PID 4632 wrote to memory of 1656	4632	Client.exe	111
PID 4632 wrote to memory of 1656	4632	Client.exe	111
PID 4632 wrote to memory of 1656	4632	Client.exe	111
PID 800 wrote to memory of 3972	800	cmd.exe	113
PID 800 wrote to memory of 3972	800	cmd.exe	113
PID 800 wrote to memory of 3972	800	cmd.exe	113

C:\Users\Admin\AppData\Local\Temp\8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe
"C:\Users\Admin\AppData\Local\Temp\8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4132
- C:\Windows\SysWOW64\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\kvOYCSsAhoZCXE" /XML "C:\Users\Admin\AppData\Local\Temp\tmpCB57.tmp"
  2⤵
  - Creates scheduled task(s)
  PID:5080
- C:\Users\Admin\AppData\Local\Temp\8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe
  "{path}"
  2⤵
  - Checks computer location settings
  - Windows security modification
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4128
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows LoginUI" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2068
- - C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2800
  - - C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\kvOYCSsAhoZCXE" /XML "C:\Users\Admin\AppData\Local\Temp\tmpB1EE.tmp"
      4⤵
      Creates scheduled task(s)
      PID:2084
  - - C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "{path}"
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:4632
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "Windows LoginUI" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:1656
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3092
- - 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:3692
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
      4⤵
      PID:1720
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\jY9nveQc2T2j.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:800
  - - C:\Windows\SysWOW64\chcp.com
      chcp 65001
      4⤵
      PID:1452
  - - C:\Windows\SysWOW64\PING.EXE
      ping -n 10 localhost
      4⤵
      Runs ping.exe
      PID:1060
  - - C:\Users\Admin\AppData\Local\Temp\8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe
      "C:\Users\Admin\AppData\Local\Temp\8bbc3dd05bc944d2b9dc013280c472067e01625ca0b7af94aa0895bb7e4f964e.exe"
      4⤵
      PID:3972

C:\Windows\System32\svchost.exe
C:\Windows\System32\svchost.exe -k netsvcs -p -s BITS
1⤵
- Modifies data under HKEY_USERS
PID:4680

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

Loading Replay Monitor...

Downloads

memory/2800-151-0x00000000049B0000-0x0000000004A42000-memory.dmp

Download

memory/2800-150-0x00000000745F0000-0x0000000074DA0000-memory.dmp

Download

memory/3092-158-0x0000000006340000-0x000000000635E000-memory.dmp

Download

memory/3092-164-0x0000000006B00000-0x0000000006B1A000-memory.dmp

Download

memory/3092-170-0x0000000007AF0000-0x0000000007AF8000-memory.dmp

Download

memory/3092-169-0x0000000007B10000-0x0000000007B2A000-memory.dmp

Download

memory/3092-168-0x0000000007AA0000-0x0000000007AAE000-memory.dmp

Download

memory/3092-167-0x00000000079B0000-0x0000000007A46000-memory.dmp

Download

memory/3092-166-0x00000000077C0000-0x00000000077CA000-memory.dmp

Download

memory/3092-165-0x000000007FDF0000-0x000000007FDF1000-memory.dmp

Download

memory/3092-149-0x0000000002AA0000-0x0000000002AD6000-memory.dmp

Download

memory/3092-163-0x0000000007E10000-0x000000000848A000-memory.dmp

Download

memory/3092-162-0x00000000069C0000-0x00000000069DE000-memory.dmp

Download

memory/3092-152-0x00000000745F0000-0x0000000074DA0000-memory.dmp

Download

memory/3092-153-0x00000000050B0000-0x00000000050B1000-memory.dmp

Download

memory/3092-154-0x00000000050B2000-0x00000000050B3000-memory.dmp

Download

memory/3092-155-0x00000000056F0000-0x0000000005D18000-memory.dmp

Download

memory/3092-156-0x0000000005410000-0x0000000005432000-memory.dmp

Download

memory/3092-157-0x00000000054B0000-0x0000000005516000-memory.dmp

Download

memory/3092-161-0x000000006F5E0000-0x000000006F62C000-memory.dmp

Download

memory/3092-159-0x00000000050B5000-0x00000000050B7000-memory.dmp

Download

memory/3092-160-0x0000000006A90000-0x0000000006AC2000-memory.dmp

Download

memory/3972-180-0x00000000745F0000-0x0000000074DA0000-memory.dmp

Download

memory/3972-181-0x0000000005280000-0x0000000005824000-memory.dmp

Download

memory/4128-146-0x0000000006DF0000-0x0000000006E2C000-memory.dmp

Download

memory/4128-143-0x0000000005570000-0x0000000005571000-memory.dmp

Download

memory/4128-144-0x0000000005B40000-0x0000000005BA6000-memory.dmp

Download

memory/4128-141-0x0000000000400000-0x000000000049A000-memory.dmp

Download

memory/4128-142-0x00000000745F0000-0x0000000074DA0000-memory.dmp

Download

memory/4128-145-0x0000000006880000-0x0000000006892000-memory.dmp

Download

memory/4132-133-0x00000000745F0000-0x0000000074DA0000-memory.dmp

Download

memory/4132-131-0x0000000005900000-0x0000000005992000-memory.dmp

Download

memory/4132-132-0x0000000005F50000-0x00000000064F4000-memory.dmp

Download

memory/4132-135-0x00000000059A0000-0x0000000005F44000-memory.dmp

Download

memory/4132-130-0x0000000000F60000-0x000000000102A000-memory.dmp

Download

memory/4132-139-0x0000000008FD0000-0x000000000906C000-memory.dmp

Download

memory/4132-134-0x00000000058A0000-0x00000000058AA000-memory.dmp

Download

memory/4632-177-0x00000000745F0000-0x0000000074DA0000-memory.dmp

Download

memory/4632-178-0x0000000005200000-0x00000000057A4000-memory.dmp

Download

memory/4680-138-0x000001BB1F060000-0x000001BB1F064000-memory.dmp

Download

memory/4680-136-0x000001BB1CA60000-0x000001BB1CA70000-memory.dmp

Download

memory/4680-137-0x000001BB1CC80000-0x000001BB1CC90000-memory.dmp

Download

memory/4680-182-0x000001BB1F330000-0x000001BB1F334000-memory.dmp

Download

memory/4680-183-0x000001BB1F310000-0x000001BB1F311000-memory.dmp

Download

memory/4680-184-0x000001BB1F090000-0x000001BB1F094000-memory.dmp

Download

memory/4680-185-0x000001BB1F080000-0x000001BB1F081000-memory.dmp

Download

memory/4680-186-0x000001BB1F080000-0x000001BB1F084000-memory.dmp

Download

memory/4680-187-0x000001BB1CD80000-0x000001BB1CD81000-memory.dmp

Download