Analysis
- max time kernel
14s - max time network
135s - platform
windows10_x64 - resource
win10-en - submitted
02/09/2021, 09:07
General
- Target CDFE55D91D06B911A69EB050AE0ABBFE.exe
- Size 200KB
- Sample210902-mxdrw8webj
- SHA256 d950a4ee53971eb72e947a01bb1093a04676b7587fc0c6ccc26d9c964b1fc916
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.
- 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\CDFE55D91D06B911A69EB050AE0ABBFE.exe"C:\Users\Admin\AppData\Local\Temp\CDFE55D91D06B911A69EB050AE0ABBFE.exe"1⤵
- Loads dropped DLL
- Checks processor information in registry
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c taskkill /pid 3332 & erase C:\Users\Admin\AppData\Local\Temp\CDFE55D91D06B911A69EB050AE0ABBFE.exe & RD /S /Q C:\\ProgramData\\498724111752681\\* & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\taskkill.exetaskkill /pid 33323⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
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