quasar | 3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc

General

Target

3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe
Size

812KB
MD5

cfa968813fa0bfd7dc8dc2ebd0a1d761
SHA1

397f43f47ab3ff37b4dabe4fa5eae15ca506fff2
SHA256

3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc
SHA512

ce22c402088e342a6b4814e55f96a3e82b0aa358ba36ad6765cf9f2c62093d558e50d4d384d34a373b80d8d32095b2e6c4a0f0de03055ee5713e0b2a632f8dae

Score

10^/10

quasar venomrat office04 persistence rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office04

C2

127.0.0.1:4782

microsoft.ddns.net:1603

Mutex

VNM_MUTEX_7zNZZlxRKgAO9rNOW0

Attributes

encryption_key
rmN2FkutvROvHylehfK8
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Venom Client Startup
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/3108-139-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def

Quasar Payload 1 IoCs

resource	yara_rule
behavioral2/memory/3108-139-0x0000000000400000-0x000000000048C000-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

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-1-5-21-1809750270-3141839489-3074374771-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\HWMonitor = "C:\\Users\\Admin\\AppData\\Roaming\\HWMonitor\\chome_exe.exe"	powershell.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
58	ip-api.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4180 set thread context of 3108	4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	101

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe
4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe
3268	powershell.exe
3268	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe
Token: SeDebugPrivilege	3268	powershell.exe
Token: SeDebugPrivilege	3108	RegAsm.exe
Token: SeDebugPrivilege	3108	RegAsm.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3108	RegAsm.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4180 wrote to memory of 3268	4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	98
PID 4180 wrote to memory of 3268	4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	98
PID 4180 wrote to memory of 3268	4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	98
PID 4180 wrote to memory of 2092	4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	100
PID 4180 wrote to memory of 2092	4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	100
PID 4180 wrote to memory of 2092	4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	100
PID 4180 wrote to memory of 3108	4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	101
PID 4180 wrote to memory of 3108	4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	101
PID 4180 wrote to memory of 3108	4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	101
PID 4180 wrote to memory of 3108	4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	101
PID 4180 wrote to memory of 3108	4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	101
PID 4180 wrote to memory of 3108	4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	101
PID 4180 wrote to memory of 3108	4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	101
PID 4180 wrote to memory of 3108	4180	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	101

C:\Users\Admin\AppData\Local\Temp\3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe
"C:\Users\Admin\AppData\Local\Temp\3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4180
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Remove-ItemProperty -Path 'HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run' -Name 'HWMonitor';New-ItemProperty -Path 'HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run' -Name 'HWMonitor' -Value '"C:\Users\Admin\AppData\Roaming\HWMonitor\chome_exe.exe"' -PropertyType 'String'
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3268
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:2092
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:3108

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/3108-146-0x00000000069F0000-0x0000000006A2C000-memory.dmp

Filesize
240KB

Download
memory/3108-145-0x00000000065B0000-0x00000000065C2000-memory.dmp

Filesize
72KB

Download
memory/3108-139-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/3268-147-0x00000000071E0000-0x0000000007276000-memory.dmp

Filesize
600KB

Download
memory/3268-137-0x0000000004BE0000-0x0000000004C16000-memory.dmp

Filesize
216KB

Download
memory/3268-149-0x0000000006770000-0x0000000006792000-memory.dmp

Filesize
136KB

Download
memory/3268-148-0x0000000006720000-0x000000000673A000-memory.dmp

Filesize
104KB

Download
memory/3268-140-0x0000000005330000-0x0000000005958000-memory.dmp

Filesize
6.2MB

Download
memory/3268-141-0x00000000052E0000-0x0000000005302000-memory.dmp

Filesize
136KB

Download
memory/3268-142-0x0000000005AD0000-0x0000000005B36000-memory.dmp

Filesize
408KB

Download
memory/3268-143-0x0000000005BB0000-0x0000000005C16000-memory.dmp

Filesize
408KB

Download
memory/3268-144-0x0000000006230000-0x000000000624E000-memory.dmp

Filesize
120KB

Download
memory/4180-133-0x0000000005680000-0x00000000056F6000-memory.dmp

Filesize
472KB

Download
memory/4180-131-0x0000000004EA0000-0x0000000004F32000-memory.dmp

Filesize
584KB

Download
memory/4180-132-0x0000000005640000-0x000000000564A000-memory.dmp

Filesize
40KB

Download
memory/4180-130-0x0000000004F80000-0x0000000005524000-memory.dmp

Filesize
5.6MB

Download
memory/4180-134-0x00000000057B0000-0x00000000057CE000-memory.dmp

Filesize
120KB

Download

Analysis

Sharing