quasar | 75031e206522faaec5981f7cf411472b23ee0508748cd5c1453e390c6facffc8

General

Target

8c274dad5fd77b0692ca5c299ffb0d26.exe
Size

536KB
MD5

8c274dad5fd77b0692ca5c299ffb0d26
SHA1

5dda42516b5f3b65093dae4b55506e9c8813d745
SHA256

75031e206522faaec5981f7cf411472b23ee0508748cd5c1453e390c6facffc8
SHA512

370c2b2f4a2342b1d3281e2b8d2a426606e0e828b4342981bcd42b16f78dd071d419d646e3c94292cf11e287347b48f2231de91a21ff2856ea08e2085da335b9
SSDEEP

12288:k04p+yRb8qXeSCTQVpyQJPiDZOjVYXRTyyss:k0M8qXzCTQ/yQWRyq

Score

10^/10

quasar venomrat office01 evasion rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office01

C2

172.81.131.113:4782

Mutex

VNM_MUTEX_OFUOtYdHQP7Y7fAk1P

Attributes

encryption_key
xufMEowCMSpdPlEx87tq
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
mvscs
subdirectory
SubDir

Signatures

Contains code to disable Windows Defender 5 IoCs

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

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\vnmtub.exe	disable_win_def
C:\Users\Admin\AppData\Local\Temp\vnmtub.exe	disable_win_def
behavioral2/memory/5008-136-0x0000000000DD0000-0x0000000000E5C000-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

Modify Existing Service

T1031

Disabling Security Tools

T1089

Processes:

vnmtub.exe

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

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

Quasar payload 5 IoCs

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Local\Temp\vnmtub.exe	family_quasar
C:\Users\Admin\AppData\Local\Temp\vnmtub.exe	family_quasar
behavioral2/memory/5008-136-0x0000000000DD0000-0x0000000000E5C000-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
Executes dropped EXE 2 IoCs

Processes:

vnmtub.exeClient.exe

pid process

5008 vnmtub.exe
2044 Client.exe

pid	process
5008	vnmtub.exe
2044	Client.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

vnmtub.exe8c274dad5fd77b0692ca5c299ffb0d26.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	vnmtub.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2891029575-1462575-1165213807-1000\Control Panel\International\Geo\Nation	8c274dad5fd77b0692ca5c299ffb0d26.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

vnmtub.exe

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

12 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

Processes:

schtasks.exeschtasks.exe

pid process

3392 schtasks.exe
4516 schtasks.exe

flow	ioc
12	ip-api.com

pid	process
3392	schtasks.exe
4516	schtasks.exe

Modifies registry class 1 IoCs

Processes:

8c274dad5fd77b0692ca5c299ffb0d26.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\	8c274dad5fd77b0692ca5c299ffb0d26.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

Processes:

powershell.exevnmtub.exe

pid process

4468 powershell.exe
4468 powershell.exe
5008 vnmtub.exe
5008 vnmtub.exe
5008 vnmtub.exe
5008 vnmtub.exe
5008 vnmtub.exe
5008 vnmtub.exe
5008 vnmtub.exe

pid	process
4468	powershell.exe
4468	powershell.exe
5008	vnmtub.exe
5008	vnmtub.exe
5008	vnmtub.exe
5008	vnmtub.exe
5008	vnmtub.exe
5008	vnmtub.exe
5008	vnmtub.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

vnmtub.exepowershell.exeClient.exe

description	pid	process
Token: SeDebugPrivilege	5008	vnmtub.exe
Token: SeDebugPrivilege	4468	powershell.exe
Token: SeDebugPrivilege	2044	Client.exe
Token: SeDebugPrivilege	2044	Client.exe

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

8c274dad5fd77b0692ca5c299ffb0d26.exevnmtub.exeClient.execmd.exe

description	pid	process	target process
PID 988 wrote to memory of 5008	988	8c274dad5fd77b0692ca5c299ffb0d26.exe	vnmtub.exe
PID 988 wrote to memory of 5008	988	8c274dad5fd77b0692ca5c299ffb0d26.exe	vnmtub.exe
PID 988 wrote to memory of 5008	988	8c274dad5fd77b0692ca5c299ffb0d26.exe	vnmtub.exe
PID 5008 wrote to memory of 3392	5008	vnmtub.exe	schtasks.exe
PID 5008 wrote to memory of 3392	5008	vnmtub.exe	schtasks.exe
PID 5008 wrote to memory of 3392	5008	vnmtub.exe	schtasks.exe
PID 5008 wrote to memory of 2044	5008	vnmtub.exe	Client.exe
PID 5008 wrote to memory of 2044	5008	vnmtub.exe	Client.exe
PID 5008 wrote to memory of 2044	5008	vnmtub.exe	Client.exe
PID 5008 wrote to memory of 4468	5008	vnmtub.exe	powershell.exe
PID 5008 wrote to memory of 4468	5008	vnmtub.exe	powershell.exe
PID 5008 wrote to memory of 4468	5008	vnmtub.exe	powershell.exe
PID 2044 wrote to memory of 4516	2044	Client.exe	schtasks.exe
PID 2044 wrote to memory of 4516	2044	Client.exe	schtasks.exe
PID 2044 wrote to memory of 4516	2044	Client.exe	schtasks.exe
PID 5008 wrote to memory of 1904	5008	vnmtub.exe	cmd.exe
PID 5008 wrote to memory of 1904	5008	vnmtub.exe	cmd.exe
PID 5008 wrote to memory of 1904	5008	vnmtub.exe	cmd.exe
PID 1904 wrote to memory of 2388	1904	cmd.exe	cmd.exe
PID 1904 wrote to memory of 2388	1904	cmd.exe	cmd.exe
PID 1904 wrote to memory of 2388	1904	cmd.exe	cmd.exe
PID 5008 wrote to memory of 4424	5008	vnmtub.exe	cmd.exe
PID 5008 wrote to memory of 4424	5008	vnmtub.exe	cmd.exe
PID 5008 wrote to memory of 4424	5008	vnmtub.exe	cmd.exe

C:\Users\Admin\AppData\Local\Temp\8c274dad5fd77b0692ca5c299ffb0d26.exe
"C:\Users\Admin\AppData\Local\Temp\8c274dad5fd77b0692ca5c299ffb0d26.exe"
1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:988

C:\Users\Admin\AppData\Local\Temp\vnmtub.exe
"C:\Users\Admin\AppData\Local\Temp\vnmtub.exe"
2⤵
- Modifies Windows Defender Real-time Protection settings
- Executes dropped EXE
- Checks computer location settings
- Windows security modification
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5008

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "mvscs" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\vnmtub.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:3392

C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
3⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2044

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "mvscs" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
4⤵
- Creates scheduled task(s)
PID:4516

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"powershell" Get-MpPreference -verbose
3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4468

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /k start /b del /q/f/s %TEMP%\* & exit
3⤵
- Suspicious use of WriteProcessMemory
PID:1904

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
4⤵
PID:2388

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\O4gLSdSur0nX.bat" "
3⤵
PID:4424

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Modify Existing Service

1

T1031

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Modify Registry

2

T1112

Disabling Security Tools

2

T1089

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\O4gLSdSur0nX.bat
Filesize
203B

MD5
c90ec2f6632f909200a512fae58e28a6

SHA1
1d381a96137740be613649cc5a01d17bd3df5128

SHA256
9ae0439d01fa5575664f9a58632af132525691a7814a6049fa2ba4e2bd49c65a

SHA512
9b320171694672a4476bd10af350685ee426826f64570f48e84b6c290218fce16abc4b6bb4007722a72e000b60369b18dfa94d5b00de0765cc44c3822782b5c1

Download Submit
C:\Users\Admin\AppData\Local\Temp\vnmtub.exe
Filesize
534KB

MD5
2785b4bbb80b75836c685ac8a1a24f27

SHA1
32dcef1d5f8e45655478c3dd960e6f9422af691c

SHA256
7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647

SHA512
fb7e706bfee26cd2c2036743799d7accd18bd150c1224bee7d42d8d88c196645d39c333e14fb2c00f18ca002c65940dac10072fe242d8d42b4d46a505d63961c

Download Submit
C:\Users\Admin\AppData\Local\Temp\vnmtub.exe
Filesize
534KB

MD5
2785b4bbb80b75836c685ac8a1a24f27

SHA1
32dcef1d5f8e45655478c3dd960e6f9422af691c

SHA256
7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647

SHA512
fb7e706bfee26cd2c2036743799d7accd18bd150c1224bee7d42d8d88c196645d39c333e14fb2c00f18ca002c65940dac10072fe242d8d42b4d46a505d63961c

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
534KB

MD5
2785b4bbb80b75836c685ac8a1a24f27

SHA1
32dcef1d5f8e45655478c3dd960e6f9422af691c

SHA256
7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647

SHA512
fb7e706bfee26cd2c2036743799d7accd18bd150c1224bee7d42d8d88c196645d39c333e14fb2c00f18ca002c65940dac10072fe242d8d42b4d46a505d63961c

Download Submit
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
Filesize
534KB

MD5
2785b4bbb80b75836c685ac8a1a24f27

SHA1
32dcef1d5f8e45655478c3dd960e6f9422af691c

SHA256
7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647

SHA512
fb7e706bfee26cd2c2036743799d7accd18bd150c1224bee7d42d8d88c196645d39c333e14fb2c00f18ca002c65940dac10072fe242d8d42b4d46a505d63961c

Download Submit
memory/988-132-0x0000000000400000-0x0000000000489000-memory.dmp

Filesize
548KB

Download
memory/1904-164-0x0000000000000000-mapping.dmp

Download
memory/2044-160-0x00000000060C0000-0x00000000060CA000-memory.dmp

Filesize
40KB

Download
memory/2044-143-0x0000000000000000-mapping.dmp

Download
memory/2388-165-0x0000000000000000-mapping.dmp

Download
memory/3392-142-0x0000000000000000-mapping.dmp

Download
memory/4424-166-0x0000000000000000-mapping.dmp

Download
memory/4468-159-0x0000000007B60000-0x0000000007BF6000-memory.dmp

Filesize
600KB

Download
memory/4468-155-0x0000000006B90000-0x0000000006BAE000-memory.dmp

Filesize
120KB

Download
memory/4468-146-0x0000000000000000-mapping.dmp

Download
memory/4468-147-0x0000000002C40000-0x0000000002C76000-memory.dmp

Filesize
216KB

Download
memory/4468-148-0x00000000057F0000-0x0000000005E18000-memory.dmp

Filesize
6.2MB

Download
memory/4468-149-0x0000000005580000-0x00000000055A2000-memory.dmp

Filesize
136KB

Download
memory/4468-150-0x0000000005720000-0x0000000005786000-memory.dmp

Filesize
408KB

Download
memory/4468-151-0x00000000065E0000-0x00000000065FE000-memory.dmp

Filesize
120KB

Download
memory/4468-163-0x0000000007C00000-0x0000000007C08000-memory.dmp

Filesize
32KB

Download
memory/4468-153-0x0000000006BB0000-0x0000000006BE2000-memory.dmp

Filesize
200KB

Download
memory/4468-154-0x000000006FCE0000-0x000000006FD2C000-memory.dmp

Filesize
304KB

Download
memory/4468-162-0x0000000007C20000-0x0000000007C3A000-memory.dmp

Filesize
104KB

Download
memory/4468-156-0x0000000007F30000-0x00000000085AA000-memory.dmp

Filesize
6.5MB

Download
memory/4468-157-0x00000000078E0000-0x00000000078FA000-memory.dmp

Filesize
104KB

Download
memory/4468-158-0x0000000007950000-0x000000000795A000-memory.dmp

Filesize
40KB

Download
memory/4468-161-0x0000000007B10000-0x0000000007B1E000-memory.dmp

Filesize
56KB

Download
memory/4516-152-0x0000000000000000-mapping.dmp

Download
memory/5008-139-0x0000000005810000-0x0000000005876000-memory.dmp

Filesize
408KB

Download
memory/5008-140-0x0000000005E80000-0x0000000005E92000-memory.dmp

Filesize
72KB

Download
memory/5008-141-0x0000000006A60000-0x0000000006A9C000-memory.dmp

Filesize
240KB

Download
memory/5008-138-0x0000000005900000-0x0000000005992000-memory.dmp

Filesize
584KB

Download
memory/5008-137-0x0000000005EB0000-0x0000000006454000-memory.dmp

Filesize
5.6MB

Download
memory/5008-136-0x0000000000DD0000-0x0000000000E5C000-memory.dmp

Filesize
560KB

Download
memory/5008-133-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads