Analysis
- max time kernel
121s - max time network
123s - platform
windows10_x64 - resource
win10-en-20211208 - submitted
28/12/2021, 07:19
General
- Target 765885e4a5bf2b58911c445e2ba0f7df.exe
- Size 2.1MB
- Sample211228-h5jffadef4
- SHA256 654574c360fcb5a7eb4f693d99d5f0c4e32f96b219a7327d41b39d7d5acde953
Malware Config
Signatures
- Arkei
Arkei is an infostealer written in C++.
- Arkei Stealer Payload 2 IoCs
- Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
- Downloads MZ/PE file
- Checks BIOS information in registry 2 TTPs 2 IoCs
BIOS information is often read in order to detect sandboxing environments.
- 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.
- Checks whether UAC is enabled 1 TTPs 1 IoCs
- Suspicious use of NtSetInformationThreadHideFromDebugger 2 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 2 IoCs
Processor information is often read in order to detect sandboxing environments.
- Delays execution with timeout.exe 1 IoCs
- Suspicious behavior: EnumeratesProcesses 4 IoCs
- Suspicious use of WriteProcessMemory 6 IoCs
Processes
-
C:\Users\Admin\AppData\Local\Temp\765885e4a5bf2b58911c445e2ba0f7df.exe"C:\Users\Admin\AppData\Local\Temp\765885e4a5bf2b58911c445e2ba0f7df.exe"1⤵
- Checks BIOS information in registry
- Loads dropped DLL
- Checks whether UAC is enabled
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\765885e4a5bf2b58911c445e2ba0f7df.exe" & exit2⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\SysWOW64\timeout.exetimeout /t 53⤵
- Delays execution with timeout.exe
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Network
MITRE ATT&CK Enterprise v6
Replay Monitor
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Downloads
memory/2656-123-0x0000000000AD0000-0x0000000000FA6000-memory.dmp
memory/2656-125-0x0000000000AD0000-0x0000000000FA6000-memory.dmp
memory/2656-120-0x0000000000AD0000-0x0000000000FA6000-memory.dmp
memory/2656-121-0x0000000000050000-0x0000000000051000-memory.dmp
memory/2656-122-0x0000000074010000-0x00000000741D2000-memory.dmp
memory/2656-115-0x0000000000A70000-0x0000000000AB4000-memory.dmp
memory/2656-124-0x0000000077510000-0x000000007769E000-memory.dmp
memory/2656-119-0x0000000000AD0000-0x0000000000FA6000-memory.dmp
memory/2656-126-0x0000000000AD0000-0x0000000000FA6000-memory.dmp
memory/2656-127-0x0000000000AD0000-0x0000000000FA6000-memory.dmp
memory/2656-118-0x0000000000AD0000-0x0000000000FA6000-memory.dmp
memory/2656-117-0x0000000000AD0000-0x0000000000FA6000-memory.dmp
memory/2656-116-0x0000000000AD0000-0x0000000000FA6000-memory.dmp