quasar | a6accf62cd5ec2b1fdd5da1a8611913453f129a96c495ca5a8d7fcc1a6a47061

Analysis

max time kernel
151s
max time network
159s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
13-03-2024 01:04

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General

Target

c4931e69ad579b38cec44aa9edb8059c.exe
Size

638KB
MD5

c4931e69ad579b38cec44aa9edb8059c
SHA1

95421f27626920e4ec0427c0b5c2d4e10a6a4e87
SHA256

a6accf62cd5ec2b1fdd5da1a8611913453f129a96c495ca5a8d7fcc1a6a47061
SHA512

0f7d46742941ac4890f2c4521843b9c2f037fcb60dfaba1c76f7a5cb55ce88c3a0936d1f99195e59e418dc89b1bd2c06395c54d237b348b0f77605ac85b365de
SSDEEP

12288:a+BbFriWGl7gO03m4sRqJ2IOEEVR/7r+pKnoqsxWbvoyF3db6e0RqsT79:a+Bxrd4lA7OvR/fqKoqsxsvoyFtbsqsd

Score

10^/10

quasar venomrat windows firewall evasion persistence rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Windows firewall

23.105.131.187:7812

Mutex

VNM_MUTEX_zGeT5SjdI1pYgFyiav

Attributes

encryption_key
3kpwI2tkVNrXY2Mm5wlR
install_name
Windows Security.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Windows Update
subdirectory
Windows Firewall Updates

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.

Processes:

resource	yara_rule
behavioral2/memory/5084-8-0x0000000000400000-0x000000000048C000-memory.dmp	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:

c4931e69ad579b38cec44aa9edb8059c.exe

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	c4931e69ad579b38cec44aa9edb8059c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	c4931e69ad579b38cec44aa9edb8059c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	c4931e69ad579b38cec44aa9edb8059c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	c4931e69ad579b38cec44aa9edb8059c.exe

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

Quasar payload 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/5084-8-0x0000000000400000-0x000000000048C000-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

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:

c4931e69ad579b38cec44aa9edb8059c.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\Control Panel\International\Geo\Nation	c4931e69ad579b38cec44aa9edb8059c.exe

Executes dropped EXE 2 IoCs

Processes:

Windows Security.exeWindows Security.exe

pid	Process
3136	Windows Security.exe
1912	Windows Security.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Processes:

c4931e69ad579b38cec44aa9edb8059c.exe

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	c4931e69ad579b38cec44aa9edb8059c.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	c4931e69ad579b38cec44aa9edb8059c.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

c4931e69ad579b38cec44aa9edb8059c.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3808065738-1666277613-1125846146-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\QwXMCzbSAJ = "C:\\Users\\Admin\\AppData\\Roaming\\jXMDeSqECF\\tEWMqGdDFT.exe"	c4931e69ad579b38cec44aa9edb8059c.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
39	ip-api.com

Suspicious use of SetThreadContext 2 IoCs

Processes:

c4931e69ad579b38cec44aa9edb8059c.exeWindows Security.exe

description	pid	Process	procid_target
PID 936 set thread context of 5084	936	c4931e69ad579b38cec44aa9edb8059c.exe	99
PID 3136 set thread context of 1912	3136	Windows Security.exe	104

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Program crash 1 IoCs

Processes:

WerFault.exe

pid	pid_target	Process	procid_target
4952	5084	WerFault.exe	99

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
4108	schtasks.exe
3452	schtasks.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

Processes:

powershell.exec4931e69ad579b38cec44aa9edb8059c.exe

pid	Process
4328	powershell.exe
4328	powershell.exe
4328	powershell.exe
5084	c4931e69ad579b38cec44aa9edb8059c.exe
5084	c4931e69ad579b38cec44aa9edb8059c.exe
5084	c4931e69ad579b38cec44aa9edb8059c.exe
5084	c4931e69ad579b38cec44aa9edb8059c.exe
5084	c4931e69ad579b38cec44aa9edb8059c.exe
5084	c4931e69ad579b38cec44aa9edb8059c.exe
5084	c4931e69ad579b38cec44aa9edb8059c.exe
5084	c4931e69ad579b38cec44aa9edb8059c.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

c4931e69ad579b38cec44aa9edb8059c.exepowershell.exeWindows Security.exe

description	pid	Process
Token: SeDebugPrivilege	5084	c4931e69ad579b38cec44aa9edb8059c.exe
Token: SeDebugPrivilege	4328	powershell.exe
Token: SeDebugPrivilege	1912	Windows Security.exe
Token: SeDebugPrivilege	1912	Windows Security.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

Windows Security.exe

pid	Process
1912	Windows Security.exe

Suspicious use of WriteProcessMemory 34 IoCs

Processes:

c4931e69ad579b38cec44aa9edb8059c.exec4931e69ad579b38cec44aa9edb8059c.exeWindows Security.exeWindows Security.execmd.exe

description	pid	Process	procid_target
PID 936 wrote to memory of 5084	936	c4931e69ad579b38cec44aa9edb8059c.exe	99
PID 936 wrote to memory of 5084	936	c4931e69ad579b38cec44aa9edb8059c.exe	99
PID 936 wrote to memory of 5084	936	c4931e69ad579b38cec44aa9edb8059c.exe	99
PID 936 wrote to memory of 5084	936	c4931e69ad579b38cec44aa9edb8059c.exe	99
PID 936 wrote to memory of 5084	936	c4931e69ad579b38cec44aa9edb8059c.exe	99
PID 936 wrote to memory of 5084	936	c4931e69ad579b38cec44aa9edb8059c.exe	99
PID 936 wrote to memory of 5084	936	c4931e69ad579b38cec44aa9edb8059c.exe	99
PID 936 wrote to memory of 5084	936	c4931e69ad579b38cec44aa9edb8059c.exe	99
PID 5084 wrote to memory of 4108	5084	c4931e69ad579b38cec44aa9edb8059c.exe	101
PID 5084 wrote to memory of 4108	5084	c4931e69ad579b38cec44aa9edb8059c.exe	101
PID 5084 wrote to memory of 4108	5084	c4931e69ad579b38cec44aa9edb8059c.exe	101
PID 5084 wrote to memory of 3136	5084	c4931e69ad579b38cec44aa9edb8059c.exe	103
PID 5084 wrote to memory of 3136	5084	c4931e69ad579b38cec44aa9edb8059c.exe	103
PID 5084 wrote to memory of 3136	5084	c4931e69ad579b38cec44aa9edb8059c.exe	103
PID 3136 wrote to memory of 1912	3136	Windows Security.exe	104
PID 3136 wrote to memory of 1912	3136	Windows Security.exe	104
PID 3136 wrote to memory of 1912	3136	Windows Security.exe	104
PID 3136 wrote to memory of 1912	3136	Windows Security.exe	104
PID 3136 wrote to memory of 1912	3136	Windows Security.exe	104
PID 3136 wrote to memory of 1912	3136	Windows Security.exe	104
PID 3136 wrote to memory of 1912	3136	Windows Security.exe	104
PID 3136 wrote to memory of 1912	3136	Windows Security.exe	104
PID 5084 wrote to memory of 4328	5084	c4931e69ad579b38cec44aa9edb8059c.exe	106
PID 5084 wrote to memory of 4328	5084	c4931e69ad579b38cec44aa9edb8059c.exe	106
PID 5084 wrote to memory of 4328	5084	c4931e69ad579b38cec44aa9edb8059c.exe	106
PID 1912 wrote to memory of 3452	1912	Windows Security.exe	110
PID 1912 wrote to memory of 3452	1912	Windows Security.exe	110
PID 1912 wrote to memory of 3452	1912	Windows Security.exe	110
PID 5084 wrote to memory of 1232	5084	c4931e69ad579b38cec44aa9edb8059c.exe	116
PID 5084 wrote to memory of 1232	5084	c4931e69ad579b38cec44aa9edb8059c.exe	116
PID 5084 wrote to memory of 1232	5084	c4931e69ad579b38cec44aa9edb8059c.exe	116
PID 1232 wrote to memory of 2884	1232	cmd.exe	118
PID 1232 wrote to memory of 2884	1232	cmd.exe	118
PID 1232 wrote to memory of 2884	1232	cmd.exe	118

C:\Users\Admin\AppData\Local\Temp\c4931e69ad579b38cec44aa9edb8059c.exe
"C:\Users\Admin\AppData\Local\Temp\c4931e69ad579b38cec44aa9edb8059c.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:936
- C:\Users\Admin\AppData\Local\Temp\c4931e69ad579b38cec44aa9edb8059c.exe
  "C:\Users\Admin\AppData\Local\Temp\c4931e69ad579b38cec44aa9edb8059c.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:5084
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\c4931e69ad579b38cec44aa9edb8059c.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:4108
- - C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe
    "C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:3136
  - - C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe
      "C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      Suspicious use of WriteProcessMemory
      PID:1912
    - - C:\Windows\SysWOW64\schtasks.exe
        
        "schtasks" /create /tn "Windows Update" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe" /rl HIGHEST /f
        5⤵
        Creates scheduled task(s)
        
        PID:3452
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell" Get-MpPreference -verbose
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4328
- - 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:1232
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /K del /q/f/s C:\Users\Admin\AppData\Local\Temp\*
      4⤵
      PID:2884
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 5084 -s 1628
    3⤵
    - Program crash
    PID:4952

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 360 -p 5084 -ip 5084
1⤵
PID:1940

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3856 --field-trial-handle=3240,i,13319578961094268484,16557498665191861597,262144 --variations-seed-version /prefetch:8
1⤵
PID:2424

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

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

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\c4931e69ad579b38cec44aa9edb8059c.exe.log

Filesize
507B

MD5
8cf94b5356be60247d331660005941ec

SHA1
fdedb361f40f22cb6a086c808fc0056d4e421131

SHA256
52a5b2d36f2b72cb02c695cf7ef46444dda73d4ea82a73e0894c805fa9987bc0

SHA512
b886dfc8bf03f8627f051fb6e2ac40ae2e7713584695a365728eb2e2c87217830029aa35bd129c642fa03dde3f7a7dd5690b16248676be60a6bb5f497fb23651

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_41yemrql.yeo.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
229B

MD5
3b3df7f9c6e1cd68a346cc8272230f25

SHA1
88555fe17fade445e3885629c280bde047057c84

SHA256
be724fae4a3743c8379d2b3179b188190f860ca1cd393236dd674885a50d00ce

SHA512
1ebb56fd007a9fd1aa16df8ae6d006595516be1132ecc224aa994db0fa79269cf0c2e9a686bc2423a8261774e237d53a52da17e26dca6d9af3fc9423bb2a00f3

Download Submit
C:\Users\Admin\AppData\Roaming\Windows Firewall Updates\Windows Security.exe

Filesize
638KB

MD5
c4931e69ad579b38cec44aa9edb8059c

SHA1
95421f27626920e4ec0427c0b5c2d4e10a6a4e87

SHA256
a6accf62cd5ec2b1fdd5da1a8611913453f129a96c495ca5a8d7fcc1a6a47061

SHA512
0f7d46742941ac4890f2c4521843b9c2f037fcb60dfaba1c76f7a5cb55ce88c3a0936d1f99195e59e418dc89b1bd2c06395c54d237b348b0f77605ac85b365de

Download Submit
memory/936-5-0x0000000005130000-0x00000000051CC000-memory.dmp

Filesize
624KB

Download
memory/936-2-0x0000000005030000-0x0000000005040000-memory.dmp

Filesize
64KB

Download
memory/936-7-0x0000000004F80000-0x0000000004F8A000-memory.dmp

Filesize
40KB

Download
memory/936-4-0x0000000005090000-0x0000000005122000-memory.dmp

Filesize
584KB

Download
memory/936-3-0x0000000005640000-0x0000000005BE4000-memory.dmp

Filesize
5.6MB

Download
memory/936-1-0x0000000000530000-0x00000000005D6000-memory.dmp

Filesize
664KB

Download
memory/936-12-0x0000000074EE0000-0x0000000075690000-memory.dmp

Filesize
7.7MB

Download
memory/936-0-0x0000000074EE0000-0x0000000075690000-memory.dmp

Filesize
7.7MB

Download
memory/1912-76-0x0000000074EE0000-0x0000000075690000-memory.dmp

Filesize
7.7MB

Download
memory/1912-52-0x0000000007240000-0x000000000724A000-memory.dmp

Filesize
40KB

Download
memory/1912-29-0x0000000074EE0000-0x0000000075690000-memory.dmp

Filesize
7.7MB

Download
memory/1912-77-0x0000000005740000-0x0000000005750000-memory.dmp

Filesize
64KB

Download
memory/1912-30-0x0000000005740000-0x0000000005750000-memory.dmp

Filesize
64KB

Download
memory/3136-22-0x0000000074EE0000-0x0000000075690000-memory.dmp

Filesize
7.7MB

Download
memory/3136-23-0x0000000005760000-0x0000000005770000-memory.dmp

Filesize
64KB

Download
memory/3136-28-0x0000000074EE0000-0x0000000075690000-memory.dmp

Filesize
7.7MB

Download
memory/4328-67-0x00000000081B0000-0x000000000882A000-memory.dmp

Filesize
6.5MB

Download
memory/4328-73-0x0000000007DB0000-0x0000000007DC4000-memory.dmp

Filesize
80KB

Download
memory/4328-80-0x0000000074EE0000-0x0000000075690000-memory.dmp

Filesize
7.7MB

Download
memory/4328-34-0x00000000051E0000-0x0000000005216000-memory.dmp

Filesize
216KB

Download
memory/4328-75-0x0000000007E90000-0x0000000007E98000-memory.dmp

Filesize
32KB

Download
memory/4328-33-0x0000000005350000-0x0000000005360000-memory.dmp

Filesize
64KB

Download
memory/4328-36-0x0000000005990000-0x0000000005FB8000-memory.dmp

Filesize
6.2MB

Download
memory/4328-37-0x0000000006010000-0x0000000006032000-memory.dmp

Filesize
136KB

Download
memory/4328-38-0x00000000060B0000-0x0000000006116000-memory.dmp

Filesize
408KB

Download
memory/4328-74-0x0000000007EB0000-0x0000000007ECA000-memory.dmp

Filesize
104KB

Download
memory/4328-44-0x0000000006200000-0x0000000006554000-memory.dmp

Filesize
3.3MB

Download
memory/4328-50-0x00000000067D0000-0x00000000067EE000-memory.dmp

Filesize
120KB

Download
memory/4328-51-0x0000000006890000-0x00000000068DC000-memory.dmp

Filesize
304KB

Download
memory/4328-31-0x0000000074EE0000-0x0000000075690000-memory.dmp

Filesize
7.7MB

Download
memory/4328-53-0x0000000005350000-0x0000000005360000-memory.dmp

Filesize
64KB

Download
memory/4328-54-0x00000000077F0000-0x0000000007822000-memory.dmp

Filesize
200KB

Download
memory/4328-55-0x0000000070170000-0x00000000701BC000-memory.dmp

Filesize
304KB

Download
memory/4328-65-0x0000000006E00000-0x0000000006E1E000-memory.dmp

Filesize
120KB

Download
memory/4328-66-0x0000000007830000-0x00000000078D3000-memory.dmp

Filesize
652KB

Download
memory/4328-72-0x0000000007DA0000-0x0000000007DAE000-memory.dmp

Filesize
56KB

Download
memory/4328-68-0x0000000007B70000-0x0000000007B8A000-memory.dmp

Filesize
104KB

Download
memory/4328-69-0x0000000007BE0000-0x0000000007BEA000-memory.dmp

Filesize
40KB

Download
memory/4328-70-0x0000000007DF0000-0x0000000007E86000-memory.dmp

Filesize
600KB

Download
memory/4328-71-0x0000000007D70000-0x0000000007D81000-memory.dmp

Filesize
68KB

Download
memory/5084-14-0x0000000005A80000-0x0000000005AE6000-memory.dmp

Filesize
408KB

Download
memory/5084-15-0x00000000066E0000-0x00000000066F2000-memory.dmp

Filesize
72KB

Download
memory/5084-16-0x0000000006C60000-0x0000000006C9C000-memory.dmp

Filesize
240KB

Download
memory/5084-35-0x0000000005630000-0x0000000005640000-memory.dmp

Filesize
64KB

Download
memory/5084-13-0x0000000005630000-0x0000000005640000-memory.dmp

Filesize
64KB

Download
memory/5084-11-0x0000000074EE0000-0x0000000075690000-memory.dmp

Filesize
7.7MB

Download
memory/5084-32-0x0000000074EE0000-0x0000000075690000-memory.dmp

Filesize
7.7MB

Download
memory/5084-8-0x0000000000400000-0x000000000048C000-memory.dmp

Filesize
560KB

Download
memory/5084-83-0x0000000074EE0000-0x0000000075690000-memory.dmp

Filesize
7.7MB

Download