quasar | d955412496d757de71c2704bdadc39245af8cda5f1ba864dedc7cf528dd0c6b3

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 2 IoCs

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

resource	yara_rule
behavioral2/files/0x000100000001ab72-12.dat	disable_win_def
behavioral2/files/0x000100000001ab72-13.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
988	VoidSB.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	Ia.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	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
10	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

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2204	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
208	powershell.exe
208	powershell.exe
208	powershell.exe
1048	Ia.exe
1048	Ia.exe
1048	Ia.exe
1048	Ia.exe
1048	Ia.exe
1048	Ia.exe
1048	Ia.exe
2272	Ia.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	1048	Ia.exe
Token: SeDebugPrivilege	208	powershell.exe
Token: SeDebugPrivilege	988	VoidSB.exe
Token: SeDebugPrivilege	988	VoidSB.exe
Token: SeDebugPrivilege	2272	Ia.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
988	VoidSB.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 1048 wrote to memory of 988	1048	Ia.exe	76
PID 1048 wrote to memory of 988	1048	Ia.exe	76
PID 1048 wrote to memory of 988	1048	Ia.exe	76
PID 1048 wrote to memory of 208	1048	Ia.exe	77
PID 1048 wrote to memory of 208	1048	Ia.exe	77
PID 1048 wrote to memory of 208	1048	Ia.exe	77
PID 1048 wrote to memory of 3044	1048	Ia.exe	81
PID 1048 wrote to memory of 3044	1048	Ia.exe	81
PID 1048 wrote to memory of 3044	1048	Ia.exe	81
PID 3044 wrote to memory of 3596	3044	cmd.exe	83
PID 3044 wrote to memory of 3596	3044	cmd.exe	83
PID 3044 wrote to memory of 3596	3044	cmd.exe	83
PID 1048 wrote to memory of 2324	1048	Ia.exe	85
PID 1048 wrote to memory of 2324	1048	Ia.exe	85
PID 1048 wrote to memory of 2324	1048	Ia.exe	85
PID 2324 wrote to memory of 1196	2324	cmd.exe	87
PID 2324 wrote to memory of 1196	2324	cmd.exe	87
PID 2324 wrote to memory of 1196	2324	cmd.exe	87
PID 2324 wrote to memory of 2204	2324	cmd.exe	88
PID 2324 wrote to memory of 2204	2324	cmd.exe	88
PID 2324 wrote to memory of 2204	2324	cmd.exe	88
PID 2324 wrote to memory of 2272	2324	cmd.exe	89
PID 2324 wrote to memory of 2272	2324	cmd.exe	89
PID 2324 wrote to memory of 2272	2324	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\Ia.exe
"C:\Users\Admin\AppData\Local\Temp\Ia.exe"
1⤵
- Windows security modification
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1048
- 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:988
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell" Get-MpPreference -verbose
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:208
- 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:3044
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
    3⤵
    PID:3596
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\biPI8NZuItc1.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2324
- - C:\Windows\SysWOW64\chcp.com
    chcp 65001
    3⤵
    PID:1196
- - C:\Windows\SysWOW64\PING.EXE
    ping -n 10 localhost
    3⤵
    - Runs ping.exe
    PID:2204
- - 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:2272

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

1

T1031

Privilege Escalation

Defense Evasion

Disabling Security Tools

Modify Registry

Credential Access

Discovery

Remote System Discovery

1

T1018

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/208-52-0x00000000098B0000-0x00000000098B1000-memory.dmp

Filesize
4KB

Download
memory/208-30-0x0000000007F60000-0x0000000007F61000-memory.dmp

Filesize
4KB

Download
memory/208-34-0x0000000007D50000-0x0000000007D51000-memory.dmp

Filesize
4KB

Download
memory/208-50-0x00000000098C0000-0x00000000098C1000-memory.dmp

Filesize
4KB

Download
memory/208-49-0x0000000004B73000-0x0000000004B74000-memory.dmp

Filesize
4KB

Download
memory/208-48-0x0000000009910000-0x0000000009911000-memory.dmp

Filesize
4KB

Download
memory/208-47-0x0000000009760000-0x0000000009761000-memory.dmp

Filesize
4KB

Download
memory/208-46-0x000000007F170000-0x000000007F171000-memory.dmp

Filesize
4KB

Download
memory/208-20-0x0000000073500000-0x0000000073BEE000-memory.dmp

Filesize
6.9MB

Download
memory/208-45-0x00000000095F0000-0x00000000095F1000-memory.dmp

Filesize
4KB

Download
memory/208-22-0x0000000004B20000-0x0000000004B21000-memory.dmp

Filesize
4KB

Download
memory/208-24-0x00000000075A0000-0x00000000075A1000-memory.dmp

Filesize
4KB

Download
memory/208-23-0x0000000004B72000-0x0000000004B73000-memory.dmp

Filesize
4KB

Download
memory/208-25-0x0000000004B70000-0x0000000004B71000-memory.dmp

Filesize
4KB

Download
memory/208-26-0x0000000007BD0000-0x0000000007BD1000-memory.dmp

Filesize
4KB

Download
memory/208-27-0x0000000007C80000-0x0000000007C81000-memory.dmp

Filesize
4KB

Download
memory/208-35-0x00000000086C0000-0x00000000086C1000-memory.dmp

Filesize
4KB

Download
memory/208-38-0x0000000009630000-0x0000000009663000-memory.dmp

Filesize
204KB

Download
memory/208-36-0x0000000008640000-0x0000000008641000-memory.dmp

Filesize
4KB

Download
memory/988-21-0x0000000004EE0000-0x0000000004EE1000-memory.dmp

Filesize
4KB

Download
memory/988-15-0x0000000073500000-0x0000000073BEE000-memory.dmp

Filesize
6.9MB

Download
memory/988-33-0x0000000006470000-0x0000000006471000-memory.dmp

Filesize
4KB

Download
memory/1048-2-0x0000000073500000-0x0000000073BEE000-memory.dmp

Filesize
6.9MB

Download
memory/1048-9-0x0000000005690000-0x0000000005691000-memory.dmp

Filesize
4KB

Download
memory/1048-7-0x0000000004B70000-0x0000000004B71000-memory.dmp

Filesize
4KB

Download
memory/1048-6-0x0000000004A10000-0x0000000004A11000-memory.dmp

Filesize
4KB

Download
memory/1048-10-0x0000000005A60000-0x0000000005A61000-memory.dmp

Filesize
4KB

Download
memory/1048-3-0x0000000000040000-0x0000000000041000-memory.dmp

Filesize
4KB

Download
memory/1048-8-0x0000000004B80000-0x0000000004B81000-memory.dmp

Filesize
4KB

Download
memory/1048-5-0x0000000004F10000-0x0000000004F11000-memory.dmp

Filesize
4KB

Download
memory/2272-62-0x0000000073500000-0x0000000073BEE000-memory.dmp

Filesize
6.9MB

Download
memory/2272-67-0x0000000005330000-0x0000000005331000-memory.dmp

Filesize
4KB

Download

Analysis

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