quasar | d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc

Analysis

max time kernel
138s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20220901-en
resource tags

arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
submitted
30/11/2022, 17:43

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General

Target
d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe
Size 655KB
Sample221130-wan94aec9v
SHA256 d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc
MD5 c6b8dff8c0e4204c318dc7e349d5f531
SHA1 af9f8e6bacac7bd9c2b59c80d4448f0abc10b3c3
SHA512 6d81e1b0b22452fab716d4e7baa8d05cec02e7a4a3d4a8460504bd7075b23645c2344576f9b0364eef9cfbce64a53d5c12266d9d7f8ab3a0c9e03fdd39d09d8f
SSDEEP 12288:QNlD5ZS/1WEJOAqRSEM3Sy21LVbK89elrrJ56m:QKIDAEQSy2TbKuKN
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar venomrat ajith evasion persistence rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

ajith

23.105.131.178:7812

Mutex

VNM_MUTEX_NdVd2sPSSqFdo7I35g

Attributes

encryption_key
jyerms3KOWmt3C9DBFuq
install_name
Windows Defender Security.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Update
subdirectory
SubDir

Signatures

Contains code to disable Windows Defender 1 IoCs

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

resource	yara_rule
behavioral2/memory/3124-137-0x0000000000400000-0x000000000048C000-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

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/3124-137-0x0000000000400000-0x000000000048C000-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 2 IoCs

pid	Process
3424	Windows Defender Security.exe
3784	Windows Defender Security.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-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.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	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Windows Services = "C:\\Users\\Admin\\AppData\\Roaming\\Windows Update Folder\\Windows Update.exe"	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.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
12	ip-api.com

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 5064 set thread context of 3124	5064	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	81
PID 3424 set thread context of 3784	3424	Windows Defender Security.exe	87

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
2292	schtasks.exe
4244	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
1748	powershell.exe
1748	powershell.exe
3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe
3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe
3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe
3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe
3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe
3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe
3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe
Token: SeDebugPrivilege	1748	powershell.exe
Token: SeDebugPrivilege	3784	Windows Defender Security.exe
Token: SeDebugPrivilege	3784	Windows Defender Security.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3784	Windows Defender Security.exe

Suspicious use of WriteProcessMemory 37 IoCs

description	pid	Process	procid_target
PID 5064 wrote to memory of 3124	5064	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	81
PID 5064 wrote to memory of 3124	5064	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	81
PID 5064 wrote to memory of 3124	5064	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	81
PID 5064 wrote to memory of 3124	5064	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	81
PID 5064 wrote to memory of 3124	5064	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	81
PID 5064 wrote to memory of 3124	5064	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	81
PID 5064 wrote to memory of 3124	5064	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	81
PID 5064 wrote to memory of 3124	5064	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	81
PID 3124 wrote to memory of 2292	3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	82
PID 3124 wrote to memory of 2292	3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	82
PID 3124 wrote to memory of 2292	3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	82
PID 3124 wrote to memory of 3424	3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	84
PID 3124 wrote to memory of 3424	3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	84
PID 3124 wrote to memory of 3424	3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	84
PID 3124 wrote to memory of 1748	3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	85
PID 3124 wrote to memory of 1748	3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	85
PID 3124 wrote to memory of 1748	3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	85
PID 3424 wrote to memory of 3784	3424	Windows Defender Security.exe	87
PID 3424 wrote to memory of 3784	3424	Windows Defender Security.exe	87
PID 3424 wrote to memory of 3784	3424	Windows Defender Security.exe	87
PID 3424 wrote to memory of 3784	3424	Windows Defender Security.exe	87
PID 3424 wrote to memory of 3784	3424	Windows Defender Security.exe	87
PID 3424 wrote to memory of 3784	3424	Windows Defender Security.exe	87
PID 3424 wrote to memory of 3784	3424	Windows Defender Security.exe	87
PID 3424 wrote to memory of 3784	3424	Windows Defender Security.exe	87
PID 3784 wrote to memory of 4244	3784	Windows Defender Security.exe	88
PID 3784 wrote to memory of 4244	3784	Windows Defender Security.exe	88
PID 3784 wrote to memory of 4244	3784	Windows Defender Security.exe	88
PID 3124 wrote to memory of 3652	3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	90
PID 3124 wrote to memory of 3652	3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	90
PID 3124 wrote to memory of 3652	3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	90
PID 3652 wrote to memory of 4764	3652	cmd.exe	92
PID 3652 wrote to memory of 4764	3652	cmd.exe	92
PID 3652 wrote to memory of 4764	3652	cmd.exe	92
PID 3124 wrote to memory of 3900	3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	93
PID 3124 wrote to memory of 3900	3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	93
PID 3124 wrote to memory of 3900	3124	d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe	93

C:\Users\Admin\AppData\Local\Temp\d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe
"C:\Users\Admin\AppData\Local\Temp\d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:5064
- C:\Users\Admin\AppData\Local\Temp\d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe
  "C:\Users\Admin\AppData\Local\Temp\d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe"
  2⤵
  - 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:3124
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2292
- - C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:3424
  - - C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:3784
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:4244
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1748
- - 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:3652
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
      4⤵
      PID:4764
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\LIGiZgIZ3blg.bat" "
    3⤵
    PID:3900

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Disabling Security Tools

T1089

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Windows Defender Security.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Windows Defender Security.exe.log
Size 507B
SHA256 52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0
MD5 8cf94b5356be60247d331660005941ec
SHA1 fdedb361f40f22cb6a086c808fc0056d4e421131
SHA512 b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651
MD5 SHA1 SHA512

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d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc.exe.log
Size 507B
SHA256 52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0
MD5 8cf94b5356be60247d331660005941ec
SHA1 fdedb361f40f22cb6a086c808fc0056d4e421131
SHA512 b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651
MD5 SHA1 SHA512

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LIGiZgIZ3blg.bat

Path C:\Users\Admin\AppData\Local\Temp\LIGiZgIZ3blg.bat
Size 261B
SHA256 b67bd770c7f7062478c7cc1cf3a6e0d30609ef537514c4d79cc840295348aa05
MD5 db275445f09d1e2e93c579028a1e6ba6
SHA1 365bd4bbd87811bfd015e9dc940853eafbdb0f06
SHA512 83b0d80cadc45b08bdbad08535bc20a484f26dd1a2af17e6e4506739dbc4ab931b439640e5774ceead35290fb0c407c8a17640868ecfdb659571c0b5c028c2ff
MD5 SHA1 SHA512

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Windows Defender Security.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
Size 655KB
SHA256 d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc
MD5 c6b8dff8c0e4204c318dc7e349d5f531
SHA1 af9f8e6bacac7bd9c2b59c80d4448f0abc10b3c3
SHA512 6d81e1b0b22452fab716d4e7baa8d05cec02e7a4a3d4a8460504bd7075b23645c2344576f9b0364eef9cfbce64a53d5c12266d9d7f8ab3a0c9e03fdd39d09d8f
SSDEEP 12288:QNlD5ZS/1WEJOAqRSEM3Sy21LVbK89elrrJ56m:QKIDAEQSy2TbKuKN
MD5 SHA1 SHA512 SSDEEP

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Windows Defender Security.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
Size 655KB
SHA256 d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc
MD5 c6b8dff8c0e4204c318dc7e349d5f531
SHA1 af9f8e6bacac7bd9c2b59c80d4448f0abc10b3c3
SHA512 6d81e1b0b22452fab716d4e7baa8d05cec02e7a4a3d4a8460504bd7075b23645c2344576f9b0364eef9cfbce64a53d5c12266d9d7f8ab3a0c9e03fdd39d09d8f
SSDEEP 12288:QNlD5ZS/1WEJOAqRSEM3Sy21LVbK89elrrJ56m:QKIDAEQSy2TbKuKN
MD5 SHA1 SHA512 SSDEEP

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Windows Defender Security.exe

Path C:\Users\Admin\AppData\Roaming\SubDir\Windows Defender Security.exe
Size 655KB
SHA256 d76aafee2e54939467b8375394c17f0f99e1dd8497fe2e9a91ff61c4b2d6c8dc
MD5 c6b8dff8c0e4204c318dc7e349d5f531
SHA1 af9f8e6bacac7bd9c2b59c80d4448f0abc10b3c3
SHA512 6d81e1b0b22452fab716d4e7baa8d05cec02e7a4a3d4a8460504bd7075b23645c2344576f9b0364eef9cfbce64a53d5c12266d9d7f8ab3a0c9e03fdd39d09d8f
SSDEEP 12288:QNlD5ZS/1WEJOAqRSEM3Sy21LVbK89elrrJ56m:QKIDAEQSy2TbKuKN
MD5 SHA1 SHA512 SSDEEP

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memory/1748-160-0x0000000007A90000-0x000000000810A000-memory.dmp

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memory/1748-166-0x0000000007770000-0x0000000007778000-memory.dmp

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memory/1748-162-0x00000000074B0000-0x00000000074BA000-memory.dmp

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memory/1748-161-0x0000000007440000-0x000000000745A000-memory.dmp

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memory/1748-164-0x0000000007680000-0x000000000768E000-memory.dmp

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memory/1748-159-0x00000000066F0000-0x000000000670E000-memory.dmp

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memory/1748-158-0x000000006FD70000-0x000000006FDBC000-memory.dmp

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memory/1748-146-0x0000000002790000-0x00000000027C6000-memory.dmp

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memory/1748-157-0x0000000007100000-0x0000000007132000-memory.dmp

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memory/1748-165-0x0000000007780000-0x000000000779A000-memory.dmp

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memory/1748-150-0x0000000005340000-0x0000000005968000-memory.dmp

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memory/1748-163-0x00000000076C0000-0x0000000007756000-memory.dmp

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memory/1748-152-0x0000000005100000-0x0000000005122000-memory.dmp

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memory/1748-153-0x0000000005A10000-0x0000000005A76000-memory.dmp

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memory/1748-154-0x0000000006140000-0x000000000615E000-memory.dmp

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memory/3124-139-0x00000000061D0000-0x00000000061E2000-memory.dmp

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memory/3124-137-0x0000000000400000-0x000000000048C000-memory.dmp

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memory/3124-138-0x00000000055B0000-0x0000000005616000-memory.dmp

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memory/3124-140-0x0000000006740000-0x000000000677C000-memory.dmp

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memory/3784-156-0x0000000007150000-0x000000000715A000-memory.dmp

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memory/5064-132-0x00000000003A0000-0x000000000044A000-memory.dmp

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memory/5064-135-0x0000000004EE0000-0x0000000004F7C000-memory.dmp

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memory/5064-134-0x0000000004E40000-0x0000000004ED2000-memory.dmp

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memory/5064-133-0x0000000005580000-0x0000000005B24000-memory.dmp

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