quasar | c839c2361421e280ca3e3dba1fbff3d833c24e91f8a8774ae5a22e6c69c3b601

Analysis

max time kernel
84s
max time network
88s
platform
windows10-2004_x64
resource
win10v2004-en-20220113
submitted
17-03-2022 12:35

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General

Target

Windows Defender.exe
Size

539KB
MD5

08d0e315fda80ebf3dc817fdaa9ee029
SHA1

f8a03cdb061ec1fbd0ea71d6b4bd688aeb2d6f5a
SHA256

c839c2361421e280ca3e3dba1fbff3d833c24e91f8a8774ae5a22e6c69c3b601
SHA512

9b8bd7f0dd44424bdb21f9adf0cab29dc8683bb2329a98fe18832b00329a1fb0827e028499fb2f7566a7bb959459972517f3ed9fc5eeb7392908a6d302ab2d20

Score

10^/10

quasar venomrat windows defender evasion rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Windows Defender

flashy-rake.auto.playit.gg:52017

Mutex

VNM_MUTEX_LYc2mMMFlAV9sQbWDZ

Attributes

encryption_key
C6mUMPNwKyGKrTzmPjoI
install_name
Windows Defender.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Defender
subdirectory
Windows Defender

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
behavioral2/memory/484-130-0x0000000000390000-0x000000000041C000-memory.dmp	disable_win_def
behavioral2/files/0x000400000001e8c5-138.dat	disable_win_def
behavioral2/files/0x000400000001e8c5-139.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 Payload 3 IoCs

resource	yara_rule
behavioral2/memory/484-130-0x0000000000390000-0x000000000041C000-memory.dmp	family_quasar
behavioral2/files/0x000400000001e8c5-138.dat	family_quasar
behavioral2/files/0x000400000001e8c5-139.dat	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 1 IoCs

pid	Process
4456	Windows Defender.exe

Checks computer location settings 2 TTPs 1 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	Windows Defender.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	Windows Defender.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	Windows Defender.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
11	ip-api.com

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 2 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
3076	schtasks.exe
2612	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
3620	PING.EXE

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
4476	powershell.exe
4476	powershell.exe
484	Windows Defender.exe
484	Windows Defender.exe
484	Windows Defender.exe
484	Windows Defender.exe
484	Windows Defender.exe
484	Windows Defender.exe
484	Windows Defender.exe
4616	Windows Defender.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	484	Windows Defender.exe
Token: SeDebugPrivilege	4476	powershell.exe
Token: SeDebugPrivilege	4456	Windows Defender.exe
Token: SeDebugPrivilege	4456	Windows Defender.exe
Token: SeDebugPrivilege	4616	Windows Defender.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4456	Windows Defender.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 484 wrote to memory of 3076	484	Windows Defender.exe	82
PID 484 wrote to memory of 3076	484	Windows Defender.exe	82
PID 484 wrote to memory of 3076	484	Windows Defender.exe	82
PID 484 wrote to memory of 4456	484	Windows Defender.exe	84
PID 484 wrote to memory of 4456	484	Windows Defender.exe	84
PID 484 wrote to memory of 4456	484	Windows Defender.exe	84
PID 484 wrote to memory of 4476	484	Windows Defender.exe	85
PID 484 wrote to memory of 4476	484	Windows Defender.exe	85
PID 484 wrote to memory of 4476	484	Windows Defender.exe	85
PID 4456 wrote to memory of 2612	4456	Windows Defender.exe	88
PID 4456 wrote to memory of 2612	4456	Windows Defender.exe	88
PID 4456 wrote to memory of 2612	4456	Windows Defender.exe	88
PID 484 wrote to memory of 3508	484	Windows Defender.exe	93
PID 484 wrote to memory of 3508	484	Windows Defender.exe	93
PID 484 wrote to memory of 3508	484	Windows Defender.exe	93
PID 3508 wrote to memory of 4364	3508	cmd.exe	95
PID 3508 wrote to memory of 4364	3508	cmd.exe	95
PID 3508 wrote to memory of 4364	3508	cmd.exe	95
PID 484 wrote to memory of 216	484	Windows Defender.exe	97
PID 484 wrote to memory of 216	484	Windows Defender.exe	97
PID 484 wrote to memory of 216	484	Windows Defender.exe	97
PID 216 wrote to memory of 3436	216	cmd.exe	99
PID 216 wrote to memory of 3436	216	cmd.exe	99
PID 216 wrote to memory of 3436	216	cmd.exe	99
PID 216 wrote to memory of 3620	216	cmd.exe	100
PID 216 wrote to memory of 3620	216	cmd.exe	100
PID 216 wrote to memory of 3620	216	cmd.exe	100
PID 216 wrote to memory of 4616	216	cmd.exe	103
PID 216 wrote to memory of 4616	216	cmd.exe	103
PID 216 wrote to memory of 4616	216	cmd.exe	103

C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe
"C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe"
1⤵
- Checks computer location settings
- Windows security modification
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:484
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:3076
- C:\Users\Admin\AppData\Roaming\Windows Defender\Windows Defender.exe
  "C:\Users\Admin\AppData\Roaming\Windows Defender\Windows Defender.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4456
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows Defender" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Defender\Windows Defender.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2612
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell" Get-MpPreference -verbose
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4476
- 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:3508
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
    3⤵
    PID:4364
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\Lj0BBRQU7IiT.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:216
- - C:\Windows\SysWOW64\chcp.com
    chcp 65001
    3⤵
    PID:3436
- - C:\Windows\SysWOW64\PING.EXE
    ping -n 10 localhost
    3⤵
    - Runs ping.exe
    PID:3620
- - C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe
    "C:\Users\Admin\AppData\Local\Temp\Windows Defender.exe"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4616

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Modify Existing Service

T1031

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

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Downloads

memory/484-133-0x0000000075410000-0x0000000075BC0000-memory.dmp

Filesize
7.7MB

Download
memory/484-135-0x00000000051F0000-0x0000000005256000-memory.dmp

Filesize
408KB

Download
memory/484-136-0x0000000005DF0000-0x0000000005E02000-memory.dmp

Filesize
72KB

Download
memory/484-137-0x0000000006210000-0x000000000624C000-memory.dmp

Filesize
240KB

Download
memory/484-134-0x0000000004E20000-0x0000000004E21000-memory.dmp

Filesize
4KB

Download
memory/484-132-0x0000000004E50000-0x0000000004EE2000-memory.dmp

Filesize
584KB

Download
memory/484-131-0x0000000005400000-0x00000000059A4000-memory.dmp

Filesize
5.6MB

Download
memory/484-130-0x0000000000390000-0x000000000041C000-memory.dmp

Filesize
560KB

Download
memory/4456-148-0x00000000050A0000-0x0000000005644000-memory.dmp

Filesize
5.6MB

Download
memory/4456-150-0x00000000069D0000-0x00000000069DA000-memory.dmp

Filesize
40KB

Download
memory/4456-143-0x0000000075410000-0x0000000075BC0000-memory.dmp

Filesize
7.7MB

Download
memory/4476-144-0x0000000075410000-0x0000000075BC0000-memory.dmp

Filesize
7.7MB

Download
memory/4476-156-0x0000000006F10000-0x0000000006F2A000-memory.dmp

Filesize
104KB

Download
memory/4476-146-0x0000000004800000-0x0000000004801000-memory.dmp

Filesize
4KB

Download
memory/4476-145-0x0000000005510000-0x0000000005576000-memory.dmp

Filesize
408KB

Download
memory/4476-149-0x0000000005C00000-0x0000000005C1E000-memory.dmp

Filesize
120KB

Download
memory/4476-142-0x0000000004D50000-0x0000000004D72000-memory.dmp

Filesize
136KB

Download
memory/4476-151-0x0000000004805000-0x0000000004807000-memory.dmp

Filesize
8KB

Download
memory/4476-152-0x0000000006DB0000-0x0000000006DE2000-memory.dmp

Filesize
200KB

Download
memory/4476-153-0x0000000070810000-0x000000007085C000-memory.dmp

Filesize
304KB

Download
memory/4476-154-0x0000000006D70000-0x0000000006D8E000-memory.dmp

Filesize
120KB

Download
memory/4476-155-0x0000000007550000-0x0000000007BCA000-memory.dmp

Filesize
6.5MB

Download
memory/4476-147-0x0000000004802000-0x0000000004803000-memory.dmp

Filesize
4KB

Download
memory/4476-157-0x000000007FC00000-0x000000007FC01000-memory.dmp

Filesize
4KB

Download
memory/4476-158-0x0000000006F80000-0x0000000006F8A000-memory.dmp

Filesize
40KB

Download
memory/4476-159-0x0000000007190000-0x0000000007226000-memory.dmp

Filesize
600KB

Download
memory/4476-160-0x0000000007140000-0x000000000714E000-memory.dmp

Filesize
56KB

Download
memory/4476-161-0x0000000007250000-0x000000000726A000-memory.dmp

Filesize
104KB

Download
memory/4476-162-0x0000000007230000-0x0000000007238000-memory.dmp

Filesize
32KB

Download
memory/4476-141-0x0000000004E40000-0x0000000005468000-memory.dmp

Filesize
6.2MB

Download
memory/4476-140-0x00000000022C0000-0x00000000022F6000-memory.dmp

Filesize
216KB

Download
memory/4616-165-0x0000000075410000-0x0000000075BC0000-memory.dmp

Filesize
7.7MB

Download
memory/4616-166-0x0000000005200000-0x00000000057A4000-memory.dmp

Filesize
5.6MB

Download