quasar | d955412496d757de71c2704bdadc39245af8cda5f1ba864dedc7cf528dd0c6b3

Analysis

max time kernel
151s
max time network
151s
platform
windows7_x64
resource
win7v20201028
submitted
04-03-2021 10:26

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General

Target

Ia.exe
Size

535KB
MD5

4522c3ecca6abca8109b4e7186d5288e
SHA1

96593ecfc2f5309ea7dc9eccc8aabe2d65732643
SHA256

d955412496d757de71c2704bdadc39245af8cda5f1ba864dedc7cf528dd0c6b3
SHA512

8a9a54cf2ffede5f1f510689964374bf420e4932563251fd5f88e8c166fe9de4ece9c624cd99df75762d929bcfe691178e0686ea0871e394023e3e77f8972676

Score

10^/10

quasar venomrat evasion rat rootkit spyware stealer trojan

Malware Config

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.

resource	yara_rule
behavioral1/files/0x00050000000130ce-6.dat	disable_win_def
behavioral1/files/0x00050000000130ce-8.dat	disable_win_def
behavioral1/files/0x00050000000130ce-9.dat	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 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 1 IoCs

pid	Process
460	VoidSB.exe

Loads dropped DLL 1 IoCs

pid	Process
1652	Ia.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	Ia.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features	Ia.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
4	ip-api.com

Drops file in System32 directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\SysWOW64\SubDir	VoidSB.exe
File created	C:\Windows\SysWOW64\SubDir\r77-x64.dll	Ia.exe
File created	C:\Windows\SysWOW64\SubDir\VoidSB.exe	Ia.exe
File opened for modification	C:\Windows\SysWOW64\SubDir\VoidSB.exe	Ia.exe
File opened for modification	C:\Windows\SysWOW64\SubDir\VoidSB.exe	VoidSB.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Modifies system certificate store 2 TTPs 2 IoCs

evasion spyware trojan

Install Root Certificate

T1130

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\A8985D3A65E5E5C4B2D7D66D40C6DD2FB19C5436	Ia.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\A8985D3A65E5E5C4B2D7D66D40C6DD2FB19C5436\Blob = 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	Ia.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1964	PING.EXE

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
1324	powershell.exe
1324	powershell.exe
1652	Ia.exe
1652	Ia.exe
1652	Ia.exe
1652	Ia.exe
1652	Ia.exe
1652	Ia.exe
1652	Ia.exe
1440	Ia.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	1652	Ia.exe
Token: SeDebugPrivilege	1324	powershell.exe
Token: SeDebugPrivilege	460	VoidSB.exe
Token: SeDebugPrivilege	460	VoidSB.exe
Token: SeDebugPrivilege	1440	Ia.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
460	VoidSB.exe

Suspicious use of WriteProcessMemory 32 IoCs

description	pid	Process	procid_target
PID 1652 wrote to memory of 460	1652	Ia.exe	30
PID 1652 wrote to memory of 460	1652	Ia.exe	30
PID 1652 wrote to memory of 460	1652	Ia.exe	30
PID 1652 wrote to memory of 460	1652	Ia.exe	30
PID 1652 wrote to memory of 1324	1652	Ia.exe	31
PID 1652 wrote to memory of 1324	1652	Ia.exe	31
PID 1652 wrote to memory of 1324	1652	Ia.exe	31
PID 1652 wrote to memory of 1324	1652	Ia.exe	31
PID 1652 wrote to memory of 1908	1652	Ia.exe	33
PID 1652 wrote to memory of 1908	1652	Ia.exe	33
PID 1652 wrote to memory of 1908	1652	Ia.exe	33
PID 1652 wrote to memory of 1908	1652	Ia.exe	33
PID 1908 wrote to memory of 1052	1908	cmd.exe	35
PID 1908 wrote to memory of 1052	1908	cmd.exe	35
PID 1908 wrote to memory of 1052	1908	cmd.exe	35
PID 1908 wrote to memory of 1052	1908	cmd.exe	35
PID 1652 wrote to memory of 428	1652	Ia.exe	36
PID 1652 wrote to memory of 428	1652	Ia.exe	36
PID 1652 wrote to memory of 428	1652	Ia.exe	36
PID 1652 wrote to memory of 428	1652	Ia.exe	36
PID 428 wrote to memory of 852	428	cmd.exe	38
PID 428 wrote to memory of 852	428	cmd.exe	38
PID 428 wrote to memory of 852	428	cmd.exe	38
PID 428 wrote to memory of 852	428	cmd.exe	38
PID 428 wrote to memory of 1964	428	cmd.exe	39
PID 428 wrote to memory of 1964	428	cmd.exe	39
PID 428 wrote to memory of 1964	428	cmd.exe	39
PID 428 wrote to memory of 1964	428	cmd.exe	39
PID 428 wrote to memory of 1440	428	cmd.exe	40
PID 428 wrote to memory of 1440	428	cmd.exe	40
PID 428 wrote to memory of 1440	428	cmd.exe	40
PID 428 wrote to memory of 1440	428	cmd.exe	40

C:\Users\Admin\AppData\Local\Temp\Ia.exe
"C:\Users\Admin\AppData\Local\Temp\Ia.exe"
1⤵
- Loads dropped DLL
- Windows security modification
- Drops file in System32 directory
- Modifies system certificate store
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1652
- C:\Windows\SysWOW64\SubDir\VoidSB.exe
  "C:\Windows\SysWOW64\SubDir\VoidSB.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  PID:460
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell" Get-MpPreference -verbose
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1324
- 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:1908
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
    3⤵
    PID:1052
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\vrxgnZw1lB4R.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:428
- - C:\Windows\SysWOW64\chcp.com
    chcp 65001
    3⤵
    PID:852
- - C:\Windows\SysWOW64\PING.EXE
    ping -n 10 localhost
    3⤵
    - Runs ping.exe
    PID:1964
- - C:\Users\Admin\AppData\Local\Temp\Ia.exe
    "C:\Users\Admin\AppData\Local\Temp\Ia.exe"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1440

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

T1031

Privilege Escalation

Defense Evasion

Disabling Security Tools

T1089

Install Root Certificate

T1130

Modify Registry

T1112

Credential Access

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/460-16-0x0000000004A60000-0x0000000004A61000-memory.dmp

Filesize
4KB

Download
memory/460-11-0x0000000074710000-0x0000000074DFE000-memory.dmp

Filesize
6.9MB

Download
memory/460-12-0x0000000000190000-0x0000000000191000-memory.dmp

Filesize
4KB

Download
memory/1324-22-0x0000000005260000-0x0000000005261000-memory.dmp

Filesize
4KB

Download
memory/1324-38-0x00000000062A0000-0x00000000062A1000-memory.dmp

Filesize
4KB

Download
memory/1324-20-0x00000000023C2000-0x00000000023C3000-memory.dmp

Filesize
4KB

Download
memory/1324-17-0x00000000023C0000-0x00000000023C1000-memory.dmp

Filesize
4KB

Download
memory/1324-18-0x0000000002480000-0x0000000002481000-memory.dmp

Filesize
4KB

Download
memory/1324-15-0x0000000074710000-0x0000000074DFE000-memory.dmp

Filesize
6.9MB

Download
memory/1324-21-0x0000000002580000-0x0000000002581000-memory.dmp

Filesize
4KB

Download
memory/1324-19-0x00000000047A0000-0x00000000047A1000-memory.dmp

Filesize
4KB

Download
memory/1324-25-0x0000000005670000-0x0000000005671000-memory.dmp

Filesize
4KB

Download
memory/1324-30-0x0000000005710000-0x0000000005711000-memory.dmp

Filesize
4KB

Download
memory/1324-31-0x00000000061C0000-0x00000000061C1000-memory.dmp

Filesize
4KB

Download
memory/1324-39-0x000000007EF30000-0x000000007EF31000-memory.dmp

Filesize
4KB

Download
memory/1324-40-0x0000000005630000-0x0000000005631000-memory.dmp

Filesize
4KB

Download
memory/1324-54-0x0000000006320000-0x0000000006321000-memory.dmp

Filesize
4KB

Download
memory/1324-55-0x0000000006330000-0x0000000006331000-memory.dmp

Filesize
4KB

Download
memory/1324-14-0x0000000075571000-0x0000000075573000-memory.dmp

Filesize
8KB

Download
memory/1440-66-0x0000000000480000-0x0000000000481000-memory.dmp

Filesize
4KB

Download
memory/1440-64-0x00000000000E0000-0x00000000000E1000-memory.dmp

Filesize
4KB

Download
memory/1440-63-0x0000000074710000-0x0000000074DFE000-memory.dmp

Filesize
6.9MB

Download
memory/1652-2-0x0000000074710000-0x0000000074DFE000-memory.dmp

Filesize
6.9MB

Download
memory/1652-3-0x00000000010D0000-0x00000000010D1000-memory.dmp

Filesize
4KB

Download
memory/1652-5-0x0000000000BC0000-0x0000000000BC1000-memory.dmp

Filesize
4KB

Download