Analysis
- max time kernel
110s - max time network
130s - platform
windows10_x64 - resource
win10-en-20211208 - submitted
15/12/2021, 02:12
General
- Target 4cb8959e4b5ce5d468c50344c77bc98a.exe
- Size 1.1MB
- Sample211215-cmvsvshfaj
- SHA256 fb142a5509971d78923e077c658479a60287c1e6d921adfc75f3a426b5ffab7b
Malware Config
Extracted
-
oski
-
golfhomexpresx.ir
Signatures
- Oski
Oski is an infostealer targeting browser data, crypto wallets.
- suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
suricata: ET MALWARE Suspicious Zipped Filename in Outbound POST Request (Passwords.txt)
- suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
suricata: ET MALWARE Vidar/Arkei/Megumin/Oski Stealer Data Exfil
- 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 SetThreadContext 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 15 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\4cb8959e4b5ce5d468c50344c77bc98a.exe"C:\Users\Admin\AppData\Local\Temp\4cb8959e4b5ce5d468c50344c77bc98a.exe"1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\4cb8959e4b5ce5d468c50344c77bc98a.exe"C:\Users\Admin\AppData\Local\Temp\4cb8959e4b5ce5d468c50344c77bc98a.exe"2⤵
- 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 4036 & erase C:\Users\Admin\AppData\Local\Temp\4cb8959e4b5ce5d468c50344c77bc98a.exe & RD /S /Q C:\\ProgramData\\043182143120505\\* & exit3⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\taskkill.exetaskkill /pid 40364⤵
- Kills process with taskkill
- Suspicious use of AdjustPrivilegeToken
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
memory/2836-120-0x00000000029D0000-0x00000000029D1000-memory.dmp
memory/2836-121-0x00000000053C0000-0x00000000053C8000-memory.dmp
memory/2836-122-0x0000000008480000-0x0000000008481000-memory.dmp
memory/2836-123-0x00000000087F0000-0x00000000087F1000-memory.dmp
memory/2836-124-0x0000000008BC0000-0x0000000008CE5000-memory.dmp
memory/2836-115-0x0000000000540000-0x0000000000541000-memory.dmp
memory/2836-119-0x00000000010B0000-0x00000000010B1000-memory.dmp
memory/2836-118-0x0000000004F90000-0x0000000004F91000-memory.dmp
memory/2836-117-0x00000000053F0000-0x00000000053F1000-memory.dmp
memory/4036-125-0x0000000000400000-0x0000000000438000-memory.dmp
memory/4036-127-0x0000000000400000-0x0000000000438000-memory.dmp