Analysis
- max time kernel
121s - max time network
127s - platform
windows10_x64 - resource
win10-en-20211208 - submitted
03/01/2022, 08:00
General
- Target 78c4c523fe6a7de58d799cf84e41553d.exe
- Size 2.6MB
- Sample220103-jv1gmsbbc4
- SHA256 8f9ff0227f4ce6ed3259d5f2f8bfd8c54496e9896ad5f522cdd768911be4b4bc
Malware Config
Signatures
- Arkei
Arkei is an infostealer written in C++.
- Arkei Stealer Payload 3 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\78c4c523fe6a7de58d799cf84e41553d.exe"C:\Users\Admin\AppData\Local\Temp\78c4c523fe6a7de58d799cf84e41553d.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\78c4c523fe6a7de58d799cf84e41553d.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/3528-122-0x00000000767B0000-0x0000000076972000-memory.dmp
memory/3528-128-0x0000000000040000-0x00000000002DC000-memory.dmp
memory/3528-123-0x00000000028F0000-0x0000000002935000-memory.dmp
memory/3528-124-0x0000000000040000-0x00000000002DC000-memory.dmp
memory/3528-125-0x0000000000040000-0x00000000002DC000-memory.dmp
memory/3528-126-0x0000000000040000-0x00000000002DC000-memory.dmp
memory/3528-127-0x0000000000040000-0x00000000002DC000-memory.dmp
memory/3528-117-0x0000000000040000-0x00000000002DC000-memory.dmp
memory/3528-129-0x0000000000040000-0x00000000002DC000-memory.dmp
memory/3528-130-0x0000000000040000-0x00000000002DC000-memory.dmp
memory/3528-131-0x0000000077C90000-0x0000000077E1E000-memory.dmp
memory/3528-121-0x0000000000320000-0x0000000000321000-memory.dmp
memory/3528-120-0x0000000000040000-0x00000000002DC000-memory.dmp
memory/3528-119-0x0000000000040000-0x00000000002DC000-memory.dmp
memory/3528-118-0x0000000000040000-0x00000000002DC000-memory.dmp