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Analysis
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max time kernel
95s -
max time network
129s -
platform
windows10-2004_x64 -
resource
win10v2004-20220901-en -
resource tags
arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system -
submitted
30/10/2022, 08:33
Behavioral task
behavioral1
Sample
32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe
Resource
win7-20220812-en
Behavioral task
behavioral2
Sample
32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe
Resource
win10v2004-20220901-en
General
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Target
32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe
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Size
101KB
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MD5
5c679d7fedebcddbc49c41c26d8ae130
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SHA1
4e9aac90acb05e45b535a801186cb6ded17891fd
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SHA256
32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751
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SHA512
e0409287484b15ba8c735b5241f8a0b47327976e6b09e4d7fc47fa3b7f37a80234a38c255572e0f167ee208fa5d116954f4c682620101abe83ddc156e38a2408
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SSDEEP
3072:ajbgbntDbgbntDbgbntDbgbntDbgbntDbgbntW5n2ThWsNexPnCrnd:ajbSxbSxbSxbSxbSxbSankP+6bd
Malware Config
Signatures
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Modifies WinLogon for persistence 2 TTPs 2 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe," 32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "Explorer.exe" 32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe -
Drops file in Drivers directory 2 IoCs
description ioc Process File created C:\Windows\SysWOW64\drivers\winupdat.exe 32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe File opened for modification C:\Windows\SysWOW64\drivers\winupdat.exe 32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe -
Sets service image path in registry 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Schedule\ImagePath = "C:\\Windows\\system32\\drivers\\winupdat.exe" 32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe -
resource yara_rule behavioral2/memory/4100-132-0x0000000000400000-0x0000000000414000-memory.dmp upx behavioral2/memory/4100-134-0x0000000000400000-0x0000000000414000-memory.dmp upx -
Adds Run key to start application 2 TTPs 4 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ntuser = "C:\\Windows\\system32\\drivers\\winupdat.exe" 32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe Set value (str) \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\autoload = "C:\\Users\\Admin\\Local Settings\\Application Data\\explores.exe" 32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\ntuser = "C:\\Windows\\system32\\drivers\\winupdat.exe" 32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\autoload = "C:\\Users\\Admin\\Local Settings\\Application Data\\explores.exe" 32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe -
Installs/modifies Browser Helper Object 2 TTPs 3 IoCs
BHOs are DLL modules which act as plugins for Internet Explorer.
description ioc Process Key deleted \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects reg.exe Key deleted \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{1FD49718-1D00-4B19-AF5F-070AF6D5D54C} reg.exe Key deleted \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{31D09BA0-12F5-4CCE-BE8A-2923E76605DA} reg.exe -
Modifies WinLogon 2 TTPs 1 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\Winlogon\UIHost = "logonui.exe" 32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe -
Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 4100 wrote to memory of 1544 4100 32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe 83 PID 4100 wrote to memory of 1544 4100 32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe 83 PID 4100 wrote to memory of 1544 4100 32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe 83
Processes
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C:\Users\Admin\AppData\Local\Temp\32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe"C:\Users\Admin\AppData\Local\Temp\32cfd991ad5df58309fcee17895be18e2e0417ba5425fb3e94841f03216e9751.exe"1⤵
- Modifies WinLogon for persistence
- Drops file in Drivers directory
- Sets service image path in registry
- Adds Run key to start application
- Modifies WinLogon
- Suspicious use of WriteProcessMemory
PID:4100 -
C:\Windows\SysWOW64\reg.exereg delete "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects" /f2⤵
- Installs/modifies Browser Helper Object
PID:1544
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