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Analysis
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max time kernel
152s -
max time network
155s -
platform
windows10-2004_x64 -
resource
win10v2004-20220901-en -
resource tags
arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system -
submitted
20/10/2022, 09:27
Static task
static1
Behavioral task
behavioral1
Sample
8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe
Resource
win7-20220812-en
Behavioral task
behavioral2
Sample
8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe
Resource
win10v2004-20220901-en
General
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Target
8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe
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Size
38KB
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MD5
80669037be14749384c364424db64fd0
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SHA1
df7d67cff05d6b905660c70907187f87cad411d5
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SHA256
8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372
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SHA512
681cefdac862bd33ba016ae317c92841758c85a13d6a987191e69ab24a700ca501222f87e36a4b277fd736df88b068675f1a98b1c51a28ff5261144149bc8394
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SSDEEP
768:uFDKZIRxEAo/Lifrz/YaqeUNNqifW5ROj10Au4pc24yjhxl:uxqmfv/Y/tqifW/Oj10Wc2RVr
Malware Config
Signatures
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Executes dropped EXE 1 IoCs
pid Process 2376 crss.exe -
Modifies Windows Firewall 1 TTPs 1 IoCs
pid Process 4720 netsh.exe -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\Control Panel\International\Geo\Nation 8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe -
Drops startup file 2 IoCs
description ioc Process File created C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\f5101deccaff383a92d229a66cb9c194.exe crss.exe File opened for modification C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\f5101deccaff383a92d229a66cb9c194.exe crss.exe -
Adds Run key to start application 2 TTPs 2 IoCs
description ioc Process Set value (str) \REGISTRY\USER\S-1-5-21-929662420-1054238289-2961194603-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\f5101deccaff383a92d229a66cb9c194 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\crss.exe\" .." crss.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\f5101deccaff383a92d229a66cb9c194 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\crss.exe\" .." crss.exe -
Drops file in Windows directory 2 IoCs
description ioc Process File created C:\Windows\Microsoft.NET\Framework64\v2.0.50727\config\security.config.cch.new 8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe File created C:\Windows\Microsoft.NET\Framework64\v2.0.50727\config\enterprisesec.config.cch.new 8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
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Suspicious use of AdjustPrivilegeToken 33 IoCs
description pid Process Token: SeDebugPrivilege 2376 crss.exe Token: 33 2376 crss.exe Token: SeIncBasePriorityPrivilege 2376 crss.exe Token: 33 2376 crss.exe Token: SeIncBasePriorityPrivilege 2376 crss.exe Token: 33 2376 crss.exe Token: SeIncBasePriorityPrivilege 2376 crss.exe Token: 33 2376 crss.exe Token: SeIncBasePriorityPrivilege 2376 crss.exe Token: 33 2376 crss.exe Token: SeIncBasePriorityPrivilege 2376 crss.exe Token: 33 2376 crss.exe Token: SeIncBasePriorityPrivilege 2376 crss.exe Token: 33 2376 crss.exe Token: SeIncBasePriorityPrivilege 2376 crss.exe Token: 33 2376 crss.exe Token: SeIncBasePriorityPrivilege 2376 crss.exe Token: 33 2376 crss.exe Token: SeIncBasePriorityPrivilege 2376 crss.exe Token: 33 2376 crss.exe Token: SeIncBasePriorityPrivilege 2376 crss.exe Token: 33 2376 crss.exe Token: SeIncBasePriorityPrivilege 2376 crss.exe Token: 33 2376 crss.exe Token: SeIncBasePriorityPrivilege 2376 crss.exe Token: 33 2376 crss.exe Token: SeIncBasePriorityPrivilege 2376 crss.exe Token: 33 2376 crss.exe Token: SeIncBasePriorityPrivilege 2376 crss.exe Token: 33 2376 crss.exe Token: SeIncBasePriorityPrivilege 2376 crss.exe Token: 33 2376 crss.exe Token: SeIncBasePriorityPrivilege 2376 crss.exe -
Suspicious use of WriteProcessMemory 4 IoCs
description pid Process procid_target PID 4368 wrote to memory of 2376 4368 8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe 84 PID 4368 wrote to memory of 2376 4368 8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe 84 PID 2376 wrote to memory of 4720 2376 crss.exe 87 PID 2376 wrote to memory of 4720 2376 crss.exe 87
Processes
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C:\Users\Admin\AppData\Local\Temp\8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe"C:\Users\Admin\AppData\Local\Temp\8f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372.exe"1⤵
- Checks computer location settings
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:4368 -
C:\Users\Admin\AppData\Local\Temp\crss.exe"C:\Users\Admin\AppData\Local\Temp\crss.exe"2⤵
- Executes dropped EXE
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2376 -
C:\Windows\SYSTEM32\netsh.exenetsh firewall add allowedprogram "C:\Users\Admin\AppData\Local\Temp\crss.exe" "crss.exe" ENABLE3⤵
- Modifies Windows Firewall
PID:4720
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
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Filesize
38KB
MD580669037be14749384c364424db64fd0
SHA1df7d67cff05d6b905660c70907187f87cad411d5
SHA2568f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372
SHA512681cefdac862bd33ba016ae317c92841758c85a13d6a987191e69ab24a700ca501222f87e36a4b277fd736df88b068675f1a98b1c51a28ff5261144149bc8394
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Filesize
38KB
MD580669037be14749384c364424db64fd0
SHA1df7d67cff05d6b905660c70907187f87cad411d5
SHA2568f438a9b94cb219d14a9d9d6172d81b9600b876acb4a4e364ae7ed84522af372
SHA512681cefdac862bd33ba016ae317c92841758c85a13d6a987191e69ab24a700ca501222f87e36a4b277fd736df88b068675f1a98b1c51a28ff5261144149bc8394