Analysis
- max time kernel
13s - max time network
102s - platform
windows10_x64 - resource
win10v20201028 - submitted
04/12/2020, 07:51
General
- Target cc41b92339a4d05cf4941a41c1b198d1.exe
- Size 840KB
- Sample201204-ez9jms45sn
- SHA256 3ecfe375bd64aa9e53b2d439c8ea9974af664aa36d060239ae7ddd1d796e0309
Score
10/10
Malware Config
Signatures
- Oski
Oski is an infostealer targeting browser data, crypto wallets.
- Downloads MZ/PE file
- Loads dropped DLL 3 IoCs
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
- Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
- Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Checks processor information in registry 2 TTPs 1 IoCs
Processor information is often read in order to detect sandboxing environments.
- Kills process with taskkill 1 IoCs
- Suspicious use of AdjustPrivilegeToken 1 IoCs
- Suspicious use of WriteProcessMemory 6 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\cc41b92339a4d05cf4941a41c1b198d1.exe"C:\Users\Admin\AppData\Local\Temp\cc41b92339a4d05cf4941a41c1b198d1.exe"1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /pid 4756 & erase C:\Users\Admin\AppData\Local\Temp\cc41b92339a4d05cf4941a41c1b198d1.exe & RD /S /Q C:\\ProgramData\\805551033443663\\* & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /pid 47563⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
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