quasar | 7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647

General

Target

7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe
Size

534KB
MD5

2785b4bbb80b75836c685ac8a1a24f27
SHA1

32dcef1d5f8e45655478c3dd960e6f9422af691c
SHA256

7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647
SHA512

fb7e706bfee26cd2c2036743799d7accd18bd150c1224bee7d42d8d88c196645d39c333e14fb2c00f18ca002c65940dac10072fe242d8d42b4d46a505d63961c
SSDEEP

6144:s8fGLJngzxsoIasFzFMkbcWV3Nce0/4obc4hpqEpZccKHBIAUYpnxVlGy3V8/GVX:WkxfIayFMPzf/m4hp7ncxKRYpn7Em

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 3 IoCs

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

Processes:

resource	yara_rule
behavioral1/memory/4964-132-0x0000000000C70000-0x0000000000CFC000-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:

7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral1/memory/4964-132-0x0000000000C70000-0x0000000000CFC000-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 1 IoCs

Processes:

Client.exe

pid process

2724 Client.exe

pid	process
2724	Client.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

Processes:

7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.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

16 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

1644 schtasks.exe
340 schtasks.exe

flow	ioc
16	ip-api.com

pid	process
1644	schtasks.exe
340	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

Processes:

powershell.exe7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe

pid	process
1672	powershell.exe
1672	powershell.exe
4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe
4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe
4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe
4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe
4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe
4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe
4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exepowershell.exeClient.exe

description	pid	process
Token: SeDebugPrivilege	4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe
Token: SeDebugPrivilege	1672	powershell.exe
Token: SeDebugPrivilege	2724	Client.exe
Token: SeDebugPrivilege	2724	Client.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exeClient.execmd.exe

description	pid	process	target process
PID 4964 wrote to memory of 1644	4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe	schtasks.exe
PID 4964 wrote to memory of 1644	4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe	schtasks.exe
PID 4964 wrote to memory of 1644	4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe	schtasks.exe
PID 4964 wrote to memory of 2724	4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe	Client.exe
PID 4964 wrote to memory of 2724	4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe	Client.exe
PID 4964 wrote to memory of 2724	4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe	Client.exe
PID 4964 wrote to memory of 1672	4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe	powershell.exe
PID 4964 wrote to memory of 1672	4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe	powershell.exe
PID 4964 wrote to memory of 1672	4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe	powershell.exe
PID 2724 wrote to memory of 340	2724	Client.exe	schtasks.exe
PID 2724 wrote to memory of 340	2724	Client.exe	schtasks.exe
PID 2724 wrote to memory of 340	2724	Client.exe	schtasks.exe
PID 4964 wrote to memory of 4620	4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe	cmd.exe
PID 4964 wrote to memory of 4620	4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe	cmd.exe
PID 4964 wrote to memory of 4620	4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe	cmd.exe
PID 4620 wrote to memory of 892	4620	cmd.exe	cmd.exe
PID 4620 wrote to memory of 892	4620	cmd.exe	cmd.exe
PID 4620 wrote to memory of 892	4620	cmd.exe	cmd.exe
PID 4964 wrote to memory of 4944	4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe	cmd.exe
PID 4964 wrote to memory of 4944	4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe	cmd.exe
PID 4964 wrote to memory of 4944	4964	7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe	cmd.exe

C:\Users\Admin\AppData\Local\Temp\7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe
"C:\Users\Admin\AppData\Local\Temp\7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.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:4964

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "mvscs" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647.exe" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1644

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 WriteProcessMemory
PID:2724

C:\Windows\SysWOW64\schtasks.exe
"schtasks" /create /tn "mvscs" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
3⤵
- Creates scheduled task(s)
PID:340

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"powershell" Get-MpPreference -verbose
2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1672

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:4620

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
3⤵
PID:892

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\20PMCeyMAB3T.bat" "
2⤵
PID:4944

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\20PMCeyMAB3T.bat
Filesize
261B

MD5
4e7f030cc31c8ef5d22a94ce18d95415

SHA1
a90931970efd540e916c550ff977ff1ded6608e1

SHA256
b8d9396e4c26df1f16e2fb147c847441c8e0b63204a58e2fc4b69a5aa78bc891

SHA512
182641701ee6e85e2641e28ea00a6ade3e861ab252cbc57a4bedbc7b77c7eafd8f8e557c43b4876fd80246184228a09187bfa36812227ea932819231bfc6fb1d

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/340-148-0x0000000000000000-mapping.dmp

Download
memory/892-161-0x0000000000000000-mapping.dmp

Download
memory/1644-138-0x0000000000000000-mapping.dmp

Download
memory/1672-157-0x0000000006F20000-0x0000000006F2E000-memory.dmp

Filesize
56KB

Download
memory/1672-147-0x00000000059D0000-0x00000000059EE000-memory.dmp

Filesize
120KB

Download
memory/1672-146-0x0000000005360000-0x00000000053C6000-memory.dmp

Filesize
408KB

Download
memory/1672-152-0x0000000006B90000-0x0000000006BAE000-memory.dmp

Filesize
120KB

Download
memory/1672-142-0x0000000000000000-mapping.dmp

Download
memory/1672-143-0x00000000020F0000-0x0000000002126000-memory.dmp

Filesize
216KB

Download
memory/1672-144-0x0000000004CC0000-0x00000000052E8000-memory.dmp

Filesize
6.2MB

Download
memory/1672-145-0x0000000004C10000-0x0000000004C32000-memory.dmp

Filesize
136KB

Download
memory/1672-151-0x000000006FD70000-0x000000006FDBC000-memory.dmp

Filesize
304KB

Download
memory/1672-158-0x0000000007030000-0x000000000704A000-memory.dmp

Filesize
104KB

Download
memory/1672-159-0x0000000007010000-0x0000000007018000-memory.dmp

Filesize
32KB

Download
memory/1672-156-0x0000000006F70000-0x0000000007006000-memory.dmp

Filesize
600KB

Download
memory/1672-155-0x0000000006D60000-0x0000000006D6A000-memory.dmp

Filesize
40KB

Download
memory/1672-150-0x0000000005FA0000-0x0000000005FD2000-memory.dmp

Filesize
200KB

Download
memory/1672-154-0x0000000006CF0000-0x0000000006D0A000-memory.dmp

Filesize
104KB

Download
memory/1672-153-0x0000000007330000-0x00000000079AA000-memory.dmp

Filesize
6.5MB

Download
memory/2724-149-0x0000000007140000-0x000000000714A000-memory.dmp

Filesize
40KB

Download
memory/2724-139-0x0000000000000000-mapping.dmp

Download
memory/4620-160-0x0000000000000000-mapping.dmp

Download
memory/4944-162-0x0000000000000000-mapping.dmp

Download
memory/4964-135-0x00000000056B0000-0x0000000005716000-memory.dmp

Filesize
408KB

Download
memory/4964-136-0x00000000066D0000-0x00000000066E2000-memory.dmp

Filesize
72KB

Download
memory/4964-134-0x0000000005730000-0x00000000057C2000-memory.dmp

Filesize
584KB

Download
memory/4964-133-0x0000000005CE0000-0x0000000006284000-memory.dmp

Filesize
5.6MB

Download
memory/4964-137-0x0000000006B00000-0x0000000006B3C000-memory.dmp

Filesize
240KB

Download
memory/4964-132-0x0000000000C70000-0x0000000000CFC000-memory.dmp

Filesize
560KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads