quasar | 7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647

Analysis

max time kernel
144s
max time network
149s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
15-01-2023 13:56

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General

Target

2785b4bbb80b75836c685ac8a1a24f27.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

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
behavioral1/memory/1744-54-0x0000000000C20000-0x0000000000CAC000-memory.dmp	disable_win_def
behavioral1/files/0x000a000000012306-57.dat	disable_win_def
behavioral1/files/0x000a000000012306-59.dat	disable_win_def
behavioral1/files/0x000a000000012306-60.dat	disable_win_def
behavioral1/memory/1872-62-0x0000000000BF0000-0x0000000000C7C000-memory.dmp	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:

2785b4bbb80b75836c685ac8a1a24f27.exe

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection	2785b4bbb80b75836c685ac8a1a24f27.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	2785b4bbb80b75836c685ac8a1a24f27.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	2785b4bbb80b75836c685ac8a1a24f27.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	2785b4bbb80b75836c685ac8a1a24f27.exe

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

Quasar payload 5 IoCs

Processes:

resource	yara_rule
behavioral1/memory/1744-54-0x0000000000C20000-0x0000000000CAC000-memory.dmp	family_quasar
behavioral1/files/0x000a000000012306-57.dat	family_quasar
behavioral1/files/0x000a000000012306-59.dat	family_quasar
behavioral1/files/0x000a000000012306-60.dat	family_quasar
behavioral1/memory/1872-62-0x0000000000BF0000-0x0000000000C7C000-memory.dmp	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
1872	Client.exe

Loads dropped DLL 1 IoCs

Processes:

2785b4bbb80b75836c685ac8a1a24f27.exe

pid	Process
1744	2785b4bbb80b75836c685ac8a1a24f27.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

2785b4bbb80b75836c685ac8a1a24f27.exe

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features	2785b4bbb80b75836c685ac8a1a24f27.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	2785b4bbb80b75836c685ac8a1a24f27.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
1	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

Program crash 1 IoCs

Processes:

WerFault.exe

pid	pid_target	Process	procid_target
960	1744	WerFault.exe	27

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
764	schtasks.exe
1452	schtasks.exe

Modifies system certificate store 2 TTPs 2 IoCs

evasion spyware trojan

Install Root Certificate

T1130

Modify Registry

T1112

Processes:

2785b4bbb80b75836c685ac8a1a24f27.exe

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\A8985D3A65E5E5C4B2D7D66D40C6DD2FB19C5436	2785b4bbb80b75836c685ac8a1a24f27.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\A8985D3A65E5E5C4B2D7D66D40C6DD2FB19C5436\Blob = 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	2785b4bbb80b75836c685ac8a1a24f27.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

Processes:

powershell.exe2785b4bbb80b75836c685ac8a1a24f27.exe

pid	Process
1836	powershell.exe
1744	2785b4bbb80b75836c685ac8a1a24f27.exe
1744	2785b4bbb80b75836c685ac8a1a24f27.exe
1744	2785b4bbb80b75836c685ac8a1a24f27.exe
1744	2785b4bbb80b75836c685ac8a1a24f27.exe
1744	2785b4bbb80b75836c685ac8a1a24f27.exe
1744	2785b4bbb80b75836c685ac8a1a24f27.exe
1744	2785b4bbb80b75836c685ac8a1a24f27.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

2785b4bbb80b75836c685ac8a1a24f27.exepowershell.exeClient.exe

description	pid	Process
Token: SeDebugPrivilege	1744	2785b4bbb80b75836c685ac8a1a24f27.exe
Token: SeDebugPrivilege	1836	powershell.exe
Token: SeDebugPrivilege	1872	Client.exe
Token: SeDebugPrivilege	1872	Client.exe

Suspicious use of WriteProcessMemory 28 IoCs

Processes:

2785b4bbb80b75836c685ac8a1a24f27.exeClient.execmd.exe

description	pid	Process	procid_target
PID 1744 wrote to memory of 764	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	29
PID 1744 wrote to memory of 764	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	29
PID 1744 wrote to memory of 764	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	29
PID 1744 wrote to memory of 764	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	29
PID 1744 wrote to memory of 1872	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	31
PID 1744 wrote to memory of 1872	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	31
PID 1744 wrote to memory of 1872	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	31
PID 1744 wrote to memory of 1872	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	31
PID 1744 wrote to memory of 1836	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	32
PID 1744 wrote to memory of 1836	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	32
PID 1744 wrote to memory of 1836	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	32
PID 1744 wrote to memory of 1836	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	32
PID 1872 wrote to memory of 1452	1872	Client.exe	34
PID 1872 wrote to memory of 1452	1872	Client.exe	34
PID 1872 wrote to memory of 1452	1872	Client.exe	34
PID 1872 wrote to memory of 1452	1872	Client.exe	34
PID 1744 wrote to memory of 1656	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	36
PID 1744 wrote to memory of 1656	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	36
PID 1744 wrote to memory of 1656	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	36
PID 1744 wrote to memory of 1656	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	36
PID 1656 wrote to memory of 828	1656	cmd.exe	38
PID 1656 wrote to memory of 828	1656	cmd.exe	38
PID 1656 wrote to memory of 828	1656	cmd.exe	38
PID 1656 wrote to memory of 828	1656	cmd.exe	38
PID 1744 wrote to memory of 960	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	39
PID 1744 wrote to memory of 960	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	39
PID 1744 wrote to memory of 960	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	39
PID 1744 wrote to memory of 960	1744	2785b4bbb80b75836c685ac8a1a24f27.exe	39

C:\Users\Admin\AppData\Local\Temp\2785b4bbb80b75836c685ac8a1a24f27.exe
"C:\Users\Admin\AppData\Local\Temp\2785b4bbb80b75836c685ac8a1a24f27.exe"
1⤵
- Modifies Windows Defender Real-time Protection settings
- Loads dropped DLL
- Windows security modification
- Modifies system certificate store
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1744
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "mvscs" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\2785b4bbb80b75836c685ac8a1a24f27.exe" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:764
- 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:1872
- - 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:1452
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell" Get-MpPreference -verbose
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1836
- 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:1656
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
    3⤵
    PID:828
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 1744 -s 1984
  2⤵
  - Program crash
  PID:960

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

Install Root Certificate

T1130

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\bWbKWlfKnLm0.bat

Filesize
229B

MD5
bde8df29846495eb827f9e6945161f21

SHA1
7174ae29debf0e4da2fe4fc4ba0d48e9315fb33a

SHA256
950b352d9deb8b1724c6e3e268ef26d081b15cf0371224c021ed3bfa24f79173

SHA512
1378f4046ab6a0f83901a6194e4d026ca7d915fde6cbed01b8a6d9cc250603cc655a01a5811696778c8f0a0181dd5dd52790fcb05139bdea9c27b00ed7e5cb88

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
\Users\Admin\AppData\Roaming\SubDir\Client.exe

Filesize
534KB

MD5
2785b4bbb80b75836c685ac8a1a24f27

SHA1
32dcef1d5f8e45655478c3dd960e6f9422af691c

SHA256
7a845c7bcfd781b09e0da20118f2e396152fc3aae1e77113c8d3adab45077647

SHA512
fb7e706bfee26cd2c2036743799d7accd18bd150c1224bee7d42d8d88c196645d39c333e14fb2c00f18ca002c65940dac10072fe242d8d42b4d46a505d63961c

Download Submit
memory/764-56-0x0000000000000000-mapping.dmp

Download
memory/828-69-0x0000000000000000-mapping.dmp

Download
memory/960-71-0x0000000000000000-mapping.dmp

Download
memory/1452-66-0x0000000000000000-mapping.dmp

Download
memory/1656-68-0x0000000000000000-mapping.dmp

Download
memory/1744-54-0x0000000000C20000-0x0000000000CAC000-memory.dmp

Filesize
560KB

Download
memory/1744-55-0x0000000075631000-0x0000000075633000-memory.dmp

Filesize
8KB

Download
memory/1836-61-0x0000000000000000-mapping.dmp

Download
memory/1836-65-0x000000006F150000-0x000000006F6FB000-memory.dmp

Filesize
5.7MB

Download
memory/1836-67-0x000000006F150000-0x000000006F6FB000-memory.dmp

Filesize
5.7MB

Download
memory/1872-58-0x0000000000000000-mapping.dmp

Download
memory/1872-62-0x0000000000BF0000-0x0000000000C7C000-memory.dmp

Filesize
560KB

Download