quasar | cd5a8de963a29d07bb003a8d03fa7ba38e5004641fe8138885c967db46bef0fc

Analysis

max time kernel
148s
max time network
164s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
09-01-2024 18:53

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

4ef1927705d28faf8456c200397d0af6.exe
Size

792KB
MD5

4ef1927705d28faf8456c200397d0af6
SHA1

b92ab805e7c2884abcf371179b0d8989c4f90025
SHA256

cd5a8de963a29d07bb003a8d03fa7ba38e5004641fe8138885c967db46bef0fc
SHA512

fe7f2405a8beb2bd70cfc689ce5ea3fc2cc4e03c72c925db698ea0e56b269b3e66c20f88afc382ea734e39b25cf66b0bcf24d72dab12d1b791ef91c690af17ac
SSDEEP

6144:K8fGABIgrx8kFYLTiMkbmM28mA04ykdBbDqIJluHLmRZXqavbvmGaGy3V8/GV0j1:LPx7FYPiMq2fkdZ9JamPaaDvreg7

Score

10^/10

quasar venomrat office04 evasion rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office04

192.168.1.154:4782

Mutex

VNM_MUTEX_ph9lkMeWS6xgznetvP

Attributes

encryption_key
2ABr09PX2FCCobHek8sv
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Venom Client Startup
subdirectory
SubDir

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.

Processes:

resource	yara_rule
behavioral2/memory/2068-1-0x00000000008D0000-0x000000000099C000-memory.dmp	disable_win_def
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	disable_win_def
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	disable_win_def

Modifies Windows Defender Real-time Protection settings 3 TTPs 4 IoCs

evasion trojan

Modify Registry

T1112

Windows Service

T1543.003

Disable or Modify Tools

T1562.001

Processes:

4ef1927705d28faf8456c200397d0af6.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	4ef1927705d28faf8456c200397d0af6.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	4ef1927705d28faf8456c200397d0af6.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	4ef1927705d28faf8456c200397d0af6.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	4ef1927705d28faf8456c200397d0af6.exe

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2068-1-0x00000000008D0000-0x000000000099C000-memory.dmp	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe	family_quasar

VenomRAT
VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.
rat rootkit stealer venomrat

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

Processes:

4ef1927705d28faf8456c200397d0af6.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2398549320-3657759451-817663969-1000\Control Panel\International\Geo\Nation	4ef1927705d28faf8456c200397d0af6.exe

Executes dropped EXE 1 IoCs

Processes:

Client.exe

pid process

4800 Client.exe

pid	process
4800	Client.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

4ef1927705d28faf8456c200397d0af6.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	4ef1927705d28faf8456c200397d0af6.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	4ef1927705d28faf8456c200397d0af6.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

23 ip-api.com
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

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/Job
T1053

Processes:

schtasks.exeschtasks.exe

pid process

1916 schtasks.exe
224 schtasks.exe
Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery
T1018

Processes:

PING.EXE

pid process

3988 PING.EXE

flow	ioc
23	ip-api.com

pid	process
1916	schtasks.exe
224	schtasks.exe

pid	process
3988	PING.EXE

Suspicious behavior: EnumeratesProcesses 13 IoCs

Processes:

powershell.exe4ef1927705d28faf8456c200397d0af6.exe4ef1927705d28faf8456c200397d0af6.exe

pid	process
4804	powershell.exe
4804	powershell.exe
4804	powershell.exe
2068	4ef1927705d28faf8456c200397d0af6.exe
2068	4ef1927705d28faf8456c200397d0af6.exe
2068	4ef1927705d28faf8456c200397d0af6.exe
2068	4ef1927705d28faf8456c200397d0af6.exe
2068	4ef1927705d28faf8456c200397d0af6.exe
2068	4ef1927705d28faf8456c200397d0af6.exe
2068	4ef1927705d28faf8456c200397d0af6.exe
2068	4ef1927705d28faf8456c200397d0af6.exe
3944	4ef1927705d28faf8456c200397d0af6.exe
3944	4ef1927705d28faf8456c200397d0af6.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

Processes:

4ef1927705d28faf8456c200397d0af6.exepowershell.exeClient.exe4ef1927705d28faf8456c200397d0af6.exe

description	pid	process
Token: SeDebugPrivilege	2068	4ef1927705d28faf8456c200397d0af6.exe
Token: SeDebugPrivilege	4804	powershell.exe
Token: SeDebugPrivilege	4800	Client.exe
Token: SeDebugPrivilege	4800	Client.exe
Token: SeDebugPrivilege	3944	4ef1927705d28faf8456c200397d0af6.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Client.exe

pid process

4800 Client.exe

pid	process
4800	Client.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

4ef1927705d28faf8456c200397d0af6.exeClient.execmd.execmd.exe

description	pid	process	target process
PID 2068 wrote to memory of 1916	2068	4ef1927705d28faf8456c200397d0af6.exe	schtasks.exe
PID 2068 wrote to memory of 1916	2068	4ef1927705d28faf8456c200397d0af6.exe	schtasks.exe
PID 2068 wrote to memory of 1916	2068	4ef1927705d28faf8456c200397d0af6.exe	schtasks.exe
PID 2068 wrote to memory of 4800	2068	4ef1927705d28faf8456c200397d0af6.exe	Client.exe
PID 2068 wrote to memory of 4800	2068	4ef1927705d28faf8456c200397d0af6.exe	Client.exe
PID 2068 wrote to memory of 4800	2068	4ef1927705d28faf8456c200397d0af6.exe	Client.exe
PID 2068 wrote to memory of 4804	2068	4ef1927705d28faf8456c200397d0af6.exe	powershell.exe
PID 2068 wrote to memory of 4804	2068	4ef1927705d28faf8456c200397d0af6.exe	powershell.exe
PID 2068 wrote to memory of 4804	2068	4ef1927705d28faf8456c200397d0af6.exe	powershell.exe
PID 4800 wrote to memory of 224	4800	Client.exe	schtasks.exe
PID 4800 wrote to memory of 224	4800	Client.exe	schtasks.exe
PID 4800 wrote to memory of 224	4800	Client.exe	schtasks.exe
PID 2068 wrote to memory of 1204	2068	4ef1927705d28faf8456c200397d0af6.exe	cmd.exe
PID 2068 wrote to memory of 1204	2068	4ef1927705d28faf8456c200397d0af6.exe	cmd.exe
PID 2068 wrote to memory of 1204	2068	4ef1927705d28faf8456c200397d0af6.exe	cmd.exe
PID 1204 wrote to memory of 2460	1204	cmd.exe	cmd.exe
PID 1204 wrote to memory of 2460	1204	cmd.exe	cmd.exe
PID 1204 wrote to memory of 2460	1204	cmd.exe	cmd.exe
PID 2068 wrote to memory of 3560	2068	4ef1927705d28faf8456c200397d0af6.exe	cmd.exe
PID 2068 wrote to memory of 3560	2068	4ef1927705d28faf8456c200397d0af6.exe	cmd.exe
PID 2068 wrote to memory of 3560	2068	4ef1927705d28faf8456c200397d0af6.exe	cmd.exe
PID 3560 wrote to memory of 2232	3560	cmd.exe	chcp.com
PID 3560 wrote to memory of 2232	3560	cmd.exe	chcp.com
PID 3560 wrote to memory of 2232	3560	cmd.exe	chcp.com
PID 3560 wrote to memory of 3988	3560	cmd.exe	PING.EXE
PID 3560 wrote to memory of 3988	3560	cmd.exe	PING.EXE
PID 3560 wrote to memory of 3988	3560	cmd.exe	PING.EXE
PID 3560 wrote to memory of 3944	3560	cmd.exe	4ef1927705d28faf8456c200397d0af6.exe
PID 3560 wrote to memory of 3944	3560	cmd.exe	4ef1927705d28faf8456c200397d0af6.exe
PID 3560 wrote to memory of 3944	3560	cmd.exe	4ef1927705d28faf8456c200397d0af6.exe

C:\Users\Admin\AppData\Local\Temp\4ef1927705d28faf8456c200397d0af6.exe
"C:\Users\Admin\AppData\Local\Temp\4ef1927705d28faf8456c200397d0af6.exe"
1⤵
- Modifies Windows Defender Real-time Protection settings
- Checks computer location settings
- Windows security modification
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2068
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "Venom Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\4ef1927705d28faf8456c200397d0af6.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:1916
- C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:4800
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Venom Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:224
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell" Get-MpPreference -verbose
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4804
- 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:1204
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
    3⤵
    PID:2460
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\TlIea1i3zqmj.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3560
- - C:\Windows\SysWOW64\chcp.com
    chcp 65001
    3⤵
    PID:2232
- - C:\Windows\SysWOW64\PING.EXE
    ping -n 10 localhost
    3⤵
    - Runs ping.exe
    PID:3988
- - C:\Users\Admin\AppData\Local\Temp\4ef1927705d28faf8456c200397d0af6.exe
    "C:\Users\Admin\AppData\Local\Temp\4ef1927705d28faf8456c200397d0af6.exe"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3944

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

T1053

Privilege Escalation

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

T1053

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

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

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\4ef1927705d28faf8456c200397d0af6.exe.log

Filesize
1KB

MD5
10eab9c2684febb5327b6976f2047587

SHA1
a12ed54146a7f5c4c580416aecb899549712449e

SHA256
f49dbd55029bfbc15134f7c6a4f967d6c39142c63f2e8f1f8c78fab108a2c928

SHA512
7e5fd90fffae723bd0c662a90e0730b507805f072771ee673d1d8c262dbf60c8a03ba5fe088f699a97c2e886380de158b2ccd59ee62e3d012dd6dd14ea9d0e50

Download Submit
C:\Users\Admin\AppData\Local\Temp\TlIea1i3zqmj.bat

Filesize
229B

MD5
19c459d65488ec49c7c4d274ca367d0f

SHA1
54b368182867049a5728390f9552c24e93589f91

SHA256
742d7bd46ea59f96002a7be15badd02d0919d537696741074c0d355a4b1ea4c6

SHA512
f49e6d84cf85baa9e447dfe3837e5b567e1b785665fbfd2ef69b315ce0d16c7cef5e5b7cdb6a7066dee16600db7a01bd00934655bad9a9728b98c173654b1aa2

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_vwul0ibe.kh3.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
792KB

MD5
4ef1927705d28faf8456c200397d0af6

SHA1
b92ab805e7c2884abcf371179b0d8989c4f90025

SHA256
cd5a8de963a29d07bb003a8d03fa7ba38e5004641fe8138885c967db46bef0fc

SHA512
fe7f2405a8beb2bd70cfc689ce5ea3fc2cc4e03c72c925db698ea0e56b269b3e66c20f88afc382ea734e39b25cf66b0bcf24d72dab12d1b791ef91c690af17ac

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
667KB

MD5
6a10889832a6917cf9baa6b14df3de90

SHA1
db36d84e1a4f5b16ecfc32eff70cc01ee93775d4

SHA256
662e74eb9261bc074fab192fc0a6a3db27ef9a88ea8dae318b9d463d18781d30

SHA512
bba62a5d1e5bc3b65eea4117c7ad6073b7b381bddec4bb0b08444d4ae6e368fa517028f88ab5e66276be293a900a62da7ec348d61164bc32c9c71f418e102c43

Download Submit
memory/2068-6-0x00000000064F0000-0x0000000006502000-memory.dmp

Filesize
72KB

Download
memory/2068-3-0x00000000053F0000-0x0000000005482000-memory.dmp

Filesize
584KB

Download
memory/2068-7-0x0000000006930000-0x000000000696C000-memory.dmp

Filesize
240KB

Download
memory/2068-5-0x0000000005490000-0x00000000054F6000-memory.dmp

Filesize
408KB

Download
memory/2068-4-0x0000000005540000-0x0000000005550000-memory.dmp

Filesize
64KB

Download
memory/2068-0-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/2068-62-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/2068-63-0x0000000005540000-0x0000000005550000-memory.dmp

Filesize
64KB

Download
memory/2068-1-0x00000000008D0000-0x000000000099C000-memory.dmp

Filesize
816KB

Download
memory/2068-2-0x0000000005900000-0x0000000005EA4000-memory.dmp

Filesize
5.6MB

Download
memory/2068-71-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/3944-74-0x0000000004F30000-0x0000000004F40000-memory.dmp

Filesize
64KB

Download
memory/3944-73-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/3944-75-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/3944-76-0x0000000004F30000-0x0000000004F40000-memory.dmp

Filesize
64KB

Download
memory/4800-49-0x00000000065F0000-0x00000000065FA000-memory.dmp

Filesize
40KB

Download
memory/4800-66-0x0000000004E50000-0x0000000004E60000-memory.dmp

Filesize
64KB

Download
memory/4800-64-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/4800-16-0x0000000004E50000-0x0000000004E60000-memory.dmp

Filesize
64KB

Download
memory/4800-12-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/4804-46-0x0000000006950000-0x000000000696E000-memory.dmp

Filesize
120KB

Download
memory/4804-58-0x00000000079F0000-0x00000000079F8000-memory.dmp

Filesize
32KB

Download
memory/4804-35-0x0000000006970000-0x00000000069A2000-memory.dmp

Filesize
200KB

Download
memory/4804-34-0x000000007F820000-0x000000007F830000-memory.dmp

Filesize
64KB

Download
memory/4804-36-0x00000000704C0000-0x000000007050C000-memory.dmp

Filesize
304KB

Download
memory/4804-50-0x0000000007D10000-0x000000000838A000-memory.dmp

Filesize
6.5MB

Download
memory/4804-51-0x00000000076D0000-0x00000000076EA000-memory.dmp

Filesize
104KB

Download
memory/4804-52-0x0000000007740000-0x000000000774A000-memory.dmp

Filesize
40KB

Download
memory/4804-53-0x0000000007950000-0x00000000079E6000-memory.dmp

Filesize
600KB

Download
memory/4804-54-0x00000000078D0000-0x00000000078E1000-memory.dmp

Filesize
68KB

Download
memory/4804-55-0x0000000007900000-0x000000000790E000-memory.dmp

Filesize
56KB

Download
memory/4804-56-0x0000000007910000-0x0000000007924000-memory.dmp

Filesize
80KB

Download
memory/4804-57-0x0000000007A10000-0x0000000007A2A000-memory.dmp

Filesize
104KB

Download
memory/4804-47-0x0000000006A00000-0x0000000006AA3000-memory.dmp

Filesize
652KB

Download
memory/4804-61-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download
memory/4804-33-0x0000000004DB0000-0x0000000004DC0000-memory.dmp

Filesize
64KB

Download
memory/4804-32-0x0000000006400000-0x000000000644C000-memory.dmp

Filesize
304KB

Download
memory/4804-31-0x00000000063C0000-0x00000000063DE000-memory.dmp

Filesize
120KB

Download
memory/4804-30-0x0000000005D40000-0x0000000006094000-memory.dmp

Filesize
3.3MB

Download
memory/4804-20-0x0000000005BB0000-0x0000000005C16000-memory.dmp

Filesize
408KB

Download
memory/4804-19-0x0000000005A90000-0x0000000005AB2000-memory.dmp

Filesize
136KB

Download
memory/4804-18-0x0000000005430000-0x0000000005A58000-memory.dmp

Filesize
6.2MB

Download
memory/4804-14-0x0000000004DB0000-0x0000000004DC0000-memory.dmp

Filesize
64KB

Download
memory/4804-17-0x0000000004DB0000-0x0000000004DC0000-memory.dmp

Filesize
64KB

Download
memory/4804-15-0x0000000004DC0000-0x0000000004DF6000-memory.dmp

Filesize
216KB

Download
memory/4804-13-0x00000000750C0000-0x0000000075870000-memory.dmp

Filesize
7.7MB

Download