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 6 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/2024-63-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/2024-64-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/2024-65-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/2024-66-0x0000000000486C6E-mapping.dmp	disable_win_def
behavioral1/memory/2024-68-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def
behavioral1/memory/2024-70-0x0000000000400000-0x000000000048C000-memory.dmp	disable_win_def

Quasar Payload 6 IoCs

Processes:

resource	yara_rule
behavioral1/memory/2024-63-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/2024-64-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/2024-65-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/2024-66-0x0000000000486C6E-mapping.dmp	family_quasar
behavioral1/memory/2024-68-0x0000000000400000-0x000000000048C000-memory.dmp	family_quasar
behavioral1/memory/2024-70-0x0000000000400000-0x000000000048C000-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

Processes:

powershell.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\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.

Processes:

flow	ioc
1	ip-api.com

Suspicious use of SetThreadContext 1 IoCs

Processes:

3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe

description	pid	Process	procid_target
PID 1320 set thread context of 2024	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	29

Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

powershell.exe

pid	Process
1148	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exepowershell.exeRegAsm.exe

description	pid	Process
Token: SeDebugPrivilege	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe
Token: SeDebugPrivilege	1148	powershell.exe
Token: SeDebugPrivilege	2024	RegAsm.exe
Token: SeDebugPrivilege	2024	RegAsm.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

RegAsm.exe

pid	Process
2024	RegAsm.exe

Suspicious use of WriteProcessMemory 16 IoCs

Processes:

3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe

description	pid	Process	procid_target
PID 1320 wrote to memory of 1148	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	27
PID 1320 wrote to memory of 1148	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	27
PID 1320 wrote to memory of 1148	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	27
PID 1320 wrote to memory of 1148	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	27
PID 1320 wrote to memory of 2024	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	29
PID 1320 wrote to memory of 2024	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	29
PID 1320 wrote to memory of 2024	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	29
PID 1320 wrote to memory of 2024	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	29
PID 1320 wrote to memory of 2024	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	29
PID 1320 wrote to memory of 2024	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	29
PID 1320 wrote to memory of 2024	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	29
PID 1320 wrote to memory of 2024	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	29
PID 1320 wrote to memory of 2024	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	29
PID 1320 wrote to memory of 2024	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	29
PID 1320 wrote to memory of 2024	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	29
PID 1320 wrote to memory of 2024	1320	3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe	29

C:\Users\Admin\AppData\Local\Temp\3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe
"C:\Users\Admin\AppData\Local\Temp\3b78f0d649e384179c12f8efcd36eb06d1484198c413f0f00e7124b05f50dedc.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1320
- 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:1148
- 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:2024

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

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Downloads

memory/1148-58-0x0000000000000000-mapping.dmp

Download
memory/1148-72-0x00000000748A0000-0x0000000074E4B000-memory.dmp

Filesize
5.7MB

Download
memory/1320-54-0x00000000049B0000-0x0000000004A80000-memory.dmp

Filesize
832KB

Download
memory/1320-55-0x00000000048E0000-0x00000000049AE000-memory.dmp

Filesize
824KB

Download
memory/1320-56-0x0000000075CD1000-0x0000000075CD3000-memory.dmp

Filesize
8KB

Download
memory/1320-57-0x0000000004E90000-0x0000000004F2E000-memory.dmp

Filesize
632KB

Download
memory/2024-61-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2024-63-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2024-64-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2024-65-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2024-66-0x0000000000486C6E-mapping.dmp

Download
memory/2024-68-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2024-70-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/2024-60-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads